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How to Promote the New Energy Vehicles under China’s “Internet plus” Initiative: A Review 认领
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作者 Fan Yang Pinjie Xie Bowen Xiang 《能源与动力工程(英文)》 2020年第5期154-181,共28页
Under the background of the rapid development of the Internet, new energy vehicles (NEVs) have ushered in an excellent development opportunity. With the subsidy policy exiting, new energy vehicles are facing unprecede... Under the background of the rapid development of the Internet, new energy vehicles (NEVs) have ushered in an excellent development opportunity. With the subsidy policy exiting, new energy vehicles are facing unprecedented challenges. One purpose of stimulating the NEVs through “Internet plus” initiative is to promote diversification of vehicle energy systems and advance industrial upgrading and transformation. On the premise of “Internet plus”, the paper analyses the obstacles and opportunities of new energy vehicles from four aspects, and proposes a promoting development model which includes management mode and profit mode, and constructs a promoting development framework which is about three stages of new energy vehicles. Finally, from the perspective of the new energy vehicle charging, the paper puts forward some policy advice to promote industrialization and popularization of new energy vehicles in China. 展开更多
关键词 New Energy Vehicle CHARGING PILE The INTERNET PLUS Development Model
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Performance of X-Section Concrete Pile Group in Coral Sand Under Vertical Loading 认领
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作者 PENG Yu LIU Jia-yi +2 位作者 DING Xuan-ming FANG Hua-qiang JIANG Chun-yong 《中国海洋工程:英文版》 SCIE EI CSCD 2020年第5期621-630,共10页
To reveal the bearing capacity of the X-section pile group in coral sand, a series of model load tests are conducted.The testing results are presented as load-settlement curves, pile-soil stress ratios, distributions ... To reveal the bearing capacity of the X-section pile group in coral sand, a series of model load tests are conducted.The testing results are presented as load-settlement curves, pile-soil stress ratios, distributions of side friction and axial force, and load-sharing ratio between side and tip resistances. The reliability and accuracy of the numerical simulation model are verified by comparing the results of the model test. Comparative analysis between X-section and circular section piles with the same cross-sectional area indicates that the bearing capacity of the X-section pile group is much larger than that of the circular pile group. The axial force of X-section piles is smaller while the peak skin friction is larger than that of circular piles at the same depth. The skin friction of the core pile is the largest,followed by the side pile and the corner pile is the smallest when the load is relatively small;however, it is converse when the load is larger than 10 k N. Compared with piles in silica sand, the pile in coral sand has a lower bearing capacity, and the sand breakage leads to the steep drop failure of pile foundation. Moreover, pile positions under the raft have less effect on the load-share differences among corner, side and core piles in coral sand. This study provides a reference for the construction of pile foundations in coral sand. 展开更多
关键词 X-section pile group coral sand model test numerical analysis pile-soil stress ratio
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Finite element prediction on the response of non-uniformly arranged pile groups considering progressive failure of pile-soil system 认领
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作者 Qian-Qing ZHANG Shan-Wei LIU +2 位作者 Ruo-Feng FENG Jian-Gu QIAN Chun-Yu CUI 《结构与土木工程前沿:英文版》 SCIE EI CSCD 2020年第4期961-982,共22页
A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation,and basin-shaped settlement is often observed in practice.Large differential settlement of pile groups will decre... A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation,and basin-shaped settlement is often observed in practice.Large differential settlement of pile groups will decrease the use-safety requirements of building,even cause the whole-building tilt or collapse.To reduce differential settlement among individual piles,non-uniformly arranged pile groups can be adopted.This paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile groups.Using the userdefined subroutine FRIC as the secondary development platform,a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS software.As to the response analysis of a single pile,the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer program.The reinforcing effects of individual piles is then analyzed using the present finite element analysis.Furthermore,the response of non-uniformly arranged pile groups,e.g.,individual piles with variable length and individual piles with variable diameter,is analyzed using the proposed numerical analysis method.Some suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes. 展开更多
关键词 numerical simulation non-uniformly arranged pile groups differential settlement pile-soil interaction
文章速递Research on Effect of Heap Loading on Deformation and Mechanical Properties of Bridge Double Pile Foundation on Steep Slope 认领
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作者 Hao Luo 《土木工程期刊(英文)》 2020年第2期117-130,共14页
In order to analyze the deformation and stress characteristics of the pile foundation on the slope<span><span><span style="font-family:" capt",serif;"="" pro="" m... In order to analyze the deformation and stress characteristics of the pile foundation on the slope<span><span><span style="font-family:" capt",serif;"="" pro="" minion="">, </span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">this paper uses the finite element software Abaqus for numerical simulation.</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion=""> </span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">The displacement and stress data of pile under different working conditions (the combination of heap load and vertical load and horizontal load and inclined load) were collected</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">;</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">the distribution of pile displacement, axial force and bending moment were analyzed. Simulation results show that: slope top loading has little effect on vertical displacement</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">;</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion=""> when the heap load exceeds 200 kPa, the horizontal displacement is greatly affected. Pile axial force decreases with pile burial depth</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">;</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">pile lateral resistance plays a more adequate role in the rock and soil layer. The bending moment of double pile foundation is positive at the top and negative at the bottom.</span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion=""> </span></span></span><span><span><span style="font-family:" capt",serif;"="" pro="" minion="">Applied oblique load has obvious p-Δ effect.</span></span></span> 展开更多
关键词 High and Steep Slope Double Pile Foundation Numerical Modeling Heap Load Abaqus Influence Degree
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文章速递Numerical Study of the Interaction between a Reinforced Concrete Pile and Soil 认领
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作者 N. M. Nde D. Fokwa +2 位作者 M. Mbessa T. T. Tamo C. Pettang 《土木工程期刊(英文)》 2020年第3期259-269,共11页
<span style="font-family:Verdana;">This paper proposes a numerical simulation of the mechanical behavior of a reinforced concrete pile foundation under an axial load. In fact, the foundation of a struc... <span style="font-family:Verdana;">This paper proposes a numerical simulation of the mechanical behavior of a reinforced concrete pile foundation under an axial load. In fact, the foundation of a structure represents the essential structural part of it, because it ensures its bearing capacity. Among the types of foundation, </span><span style="font-family:Verdana;">deep</span><span style="font-family:Verdana;"> foundation is the one for which from a mechanical point of view, the justification takes into account the isolated or combined effects of base resistance offered by the soil bed and lateral friction at the soil-pile interface;the latter being the consequence of a large contact surface with the surrounding soil;hence the need to study the interaction between the soil and the pile in service, in order to highlight the characteristics of soil which influence the mechanical behavior of pile and therefore the stability of the structure. In this study,</span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">the reinforced concrete pile is supposed to be </span><span style="font-family:Verdana;">elastic,</span><span style="font-family:Verdana;"> and characterized by a young’s modulus (</span><i><span style="font-family:Verdana;">E</span></i><span style="font-family:Verdana;">) and a Poisson’s ratio (</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">ν</span></i></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">). The soil obeys to a Camclay model characterized by </span><span style="font-family:Verdana;">a cohesion</span><span style="font-family:Verdana;"> (</span><i><span style="font-family:Verdana;">c</span></i><span style="font-family:Verdana;">), an initial voids ratio (</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">e</span></i></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><sub><span style="font-family:Verdana;">0</span></sub></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">), shearing resistance angle (</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">φ</span></i></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">) </span><span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> a pre-consolidation pressure (</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">P</span></i></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><sub><span style="font-family:Verdana;">0</span></sub></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">). A joint model with a </span><span style="font-family:Verdana;">Mohr Coulomb</span><span style="font-family:Verdana;"> behavior characterizes the soil-pile interface. The loading is carrying out by imposing a vertical monotonic displacement at the head of </span><span style="font-family:Verdana;">pile</span><span style="font-family:Verdana;">. The results in terms of stress and displacement show that the bearing capacity of the pile is influenced by various soils characteristics, it appears that the vertical stress and the force mobilized at rupture increase when the initial pre_consolidation pressure, the cohesion </span><span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> the internal friction angle of soil increase;and when the initial soil voids index decreases.</span></span></span></span> 展开更多
关键词 Pile Soil Interaction Numerical Simulation Pre_Consolidation Pressure Voids Ratio Cohesion Internal Friction Angle
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文章速递Research on Deformation and Force of Bridge Pile Foundation on High and Steep Slope in Mountainous Area 认领
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作者 Hao Luo 《世界工程和技术(英文)》 2020年第3期551-564,共14页
With the rapid development of my country’s economy, the demand for infrastructure construction is also increasing. However, in most areas of China, the terrains are mountainous and hilly. Some projects have to be bui... With the rapid development of my country’s economy, the demand for infrastructure construction is also increasing. However, in most areas of China, the terrains are mountainous and hilly. Some projects have to be built on steep slopes. Choosing viaducts or half-bridges on high-steep slopes is not only conducive to the protection of the surrounding environment, but also conducive to the stability of the slope. Bridges usually choose the form of pile </span><span style="font-family:Verdana;">foundation-high pier bridge. This paper uses numerical simulation to study and analyze the bridge pile foundation of the slope section. Relying on actual</span><span style="font-family:Verdana;"> engineering, use the finite element software ABAQUS6.14 to establish a three-dimensional finite element model to study the bearing mechanism and mechanical characteristics of the pile foundation under vertical load, horizontal load and inclined load, discuss the influence of the nature of the soil around the pile and the stiffness of the pile body on the deformation and internal force of the bridge pile foundation in the slope section. The analysis results show that the horizontal load has a great influence on the horizontal displacement of the pile, but has a small influence on the vertical displacement, and the vertical load is just the opposite. Inclined load has obvious “p-Δ” effect. The increase in soil elastic modulus and pile stiffness will reduce the displacement of the pile foundation, but after reaching a certain range, the displacement of the pile foundation will tend to be stable. Therefore, in actual engineering, if the displacement of the pile foundation fails to meet the requirements, the hardness of the soil and the stiffness of the pile can be appropriately increased, but not blindly. 展开更多
关键词 High and Steep Slope Bridge Pile Foundation Force and Deformation Analysis Influencing Factors
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复杂场地条件下深基坑支护设计 认领
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作者 张红东 《兰州工业学院学报》 2020年第2期45-49,共5页
工程场地所处大江河冲洪积地带,基坑周边环境和场区地质条件复杂,施工作业面狭窄,支护设计难度大,支护方式的选择对复杂场地支护起到关键作用.结合工程实例,采用“支护排桩+复合锚杆、土钉墙”的支护方式进行设计支护.基坑监测结果表明... 工程场地所处大江河冲洪积地带,基坑周边环境和场区地质条件复杂,施工作业面狭窄,支护设计难度大,支护方式的选择对复杂场地支护起到关键作用.结合工程实例,采用“支护排桩+复合锚杆、土钉墙”的支护方式进行设计支护.基坑监测结果表明:基坑支护结构处于稳定状态,取得了良好的支护效果,可为复杂场地基坑支护提供一定的技术参考. 展开更多
关键词 复杂场地条件 支护设计 排桩 锚杆 土钉墙
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Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations 认领
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作者 Nishant SHARMA Kaustubh DASGUPTA Arindam DEY 《结构与土木工程前沿:英文版》 SCIE EI CSCD 2020年第1期62-81,共20页
This article describes a novel approach for deciding optimal horizontal extent of soil domain to be used for finite element based numerical dynamic soil structure interaction(SSI)studies.SSI model for a 12 storied bui... This article describes a novel approach for deciding optimal horizontal extent of soil domain to be used for finite element based numerical dynamic soil structure interaction(SSI)studies.SSI model for a 12 storied building frame,supported on pile foundation-soil system,is developed in the finite element based software framework,OpenSEES.Three different structure-foundation configurations are analyzed under different ground motion characteristics.Lateral extent of soil domain,along with the soil properties,were varied exhaustively for a particular structural configuration.Based on the reduction in the variation of acceleration response at different locations in the SSI system(quantified by normalized root mean square error,NRMSE),the optimum lateral extent of the soil domain is prescribed for various structural widths,soil types and peak ground acceleration levels of ground motion.Compared to the past studies,error estimation analysis shows that the relationships prescribed in the present study are credible and more inclusive of the various factors that influence SSI.These relationships can be readily applied for deciding upon the lateral extent of the soil domain for conducting precise SSI analysis with reduced computational time. 展开更多
关键词 SOIL structure interaction OPTIMUM LATERAL extent of SOIL DOMAIN length multi-storyed framed building pile foundation OPENSEES L-K boundaries dynamic ANALYSIS
门洞尺寸可变仓栅式半挂车设计 认领
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作者 付宏卫 苏卫锋 王锟 《时代汽车》 2020年第15期98-99,共2页
根据市场需求开发一款轻量化、门洞尺寸可变的仓栅式半挂车,其既具备6开门花栏车自重轻的优点,又具备对开门车门洞尺寸较大,装卸货效率高的优点,满足用户多样化的载货需求。
关键词 轻量化 门洞尺寸可变 插桩可上提 仓栅式半挂车
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桩基对大体积承台水化热问题影响研究 认领
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作者 王东海 张宏 王雅 《混凝土》 CAS 北大核心 2020年第3期44-48,53共6页
为更好地研究桩基对大体积混凝土承台水化热温度场与温度应力问题,基于Midas软件建立承台有桩和无桩模型,对大体积承台进行水化热仿真计算,并将结果与大体积承台水化热实测数据进行比较。研究结果表明:有桩模型下部温度场分布为中心部... 为更好地研究桩基对大体积混凝土承台水化热温度场与温度应力问题,基于Midas软件建立承台有桩和无桩模型,对大体积承台进行水化热仿真计算,并将结果与大体积承台水化热实测数据进行比较。研究结果表明:有桩模型下部温度场分布为中心部位高四周低,且在冷却管部位出现低温断层;下部节点应力满足先拉应力后压应力的规律。有桩模型底部温度基本处于稳定范围内,并在沿桩基截面形成放射状低温区;底部节点应力发展规律紊乱,极易产生破坏。 展开更多
关键词 大体积混凝土承台 水化热 MIDAS 桩基
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Effects of topography on dynamic responses of single piles under vertical cyclic loading 认领
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作者 QU Li-ming DING Xuan-ming +2 位作者 WU Chong-rong LONG Yong-hong YANG Jin-chuan 《山地科学学报:英文版》 SCIE CSCD 2020年第1期230-243,共14页
This paper describes model tests of single piles subjected to vertical cyclic compressive loading for three kinds of topography: sloping ground, level ground, and inclined bedrock. Comprehensive dynamic responses invo... This paper describes model tests of single piles subjected to vertical cyclic compressive loading for three kinds of topography: sloping ground, level ground, and inclined bedrock. Comprehensive dynamic responses involving cyclic effects and vibration behaviours are studied under various load combinations of dynamic amplitude, mean load,frequency and number of cycles. Test results show that permanent settlement can generally be predicted with a quadratic function or power function of cycles.Sloping ground topography produces more pronounced settlement than level ground under the same load condition. For vibration behaviour,displacement amplitude is weakly affected by the number of cycles, while load amplitude significantly influences dynamic responses. Test results also reveal that increasing load amplitude intensifies nonlinearity and topography effects. The strain distribution in a pile and soil stress at the pile tip are displayed to investigate the vibration mechanism accounting for sloping ground effects. Furthermore, the dynamic characteristics among three kinds of topography in the elastic stage are studied using a three-dimensional finite method. Numerical results are validated by comparing with experimental results for base inclination topography. An inclined soil profile boundary causes non-axisymmetric resultant deformation, though a small difference in vertical displacement is observed. 展开更多
关键词 PILE Model test Dynamic response PERMANENT SETTLEMENT Vibration DISPLACEMENT TOPOGRAPHY EFFECTS
地铁隧道斜穿施工对桥桩影响的数值分析 认领
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作者 王磊 骆建军 +2 位作者 高立平 李飞龙 姜伟 《北京交通大学学报》 CAS CSCD 北大核心 2020年第4期24-33,共10页
地铁隧道穿越施工引起既有桥梁桩基沉降变形及承载力损失,可能会严重影响桥梁正常使用.采用数值方法研究了隧道斜穿施工对既有桥梁桩基位移变形和内力的影响.通过与现场实测结果进行对比,验证了数值模型的准确性.研究结果表明:拱顶上方... 地铁隧道穿越施工引起既有桥梁桩基沉降变形及承载力损失,可能会严重影响桥梁正常使用.采用数值方法研究了隧道斜穿施工对既有桥梁桩基位移变形和内力的影响.通过与现场实测结果进行对比,验证了数值模型的准确性.研究结果表明:拱顶上方的桩基沉降量最大,沉降变形对合位移的贡献率达98.7%,而桥梁右幅桩基以横向挠曲变形为主;斜穿施工引起的桥桩变形空间效应显著,合位移方向与隧道轴线呈一定角度,该角度与埋深、桩-隧水平距离有关;桩身弯矩受桩-隧水平距离影响显著,桥梁上部结构对桥桩变形约束作用不能忽略;桥桩轴向受力状态不同,拱顶上方桥桩基本受拉,而其他位置桥桩以受压为主;衬砌厚度、衬砌后注浆范围对桥梁沉降变形影响规律相似,而地表加固深度对桥梁沉降的影响规律较为复杂. 展开更多
关键词 矿山法隧道 桥梁 桥桩 变形 内力 有限元法
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Benefit allocation model of distributed photovoltaic power generation vehicle shed and energy storage charging pile based on integrated weighting-Shapley method 认领
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作者 Qingkun Tan Peng Wu +3 位作者 Wei Tang Chang Cao Chengjie Wang Yu Zhang 《全球能源互联网:英文版》 2020年第4期375-384,共10页
In this study,to develop a benefit-allocation model,in-depth analysis of a distributed photovoltaic-powergeneration carport and energy-storage charging-pile project was performed;the model was developed using Shapley ... In this study,to develop a benefit-allocation model,in-depth analysis of a distributed photovoltaic-powergeneration carport and energy-storage charging-pile project was performed;the model was developed using Shapley integrated-empowerment benefit-distribution method.First,through literature survey and expert interview to identify the risk factors at various stages of the project,a dynamic risk-factor indicator system is developed.Second,to obtain a more meaningful risk-calculation result,the subjective and objective weights are combined,the weights of the risk factors at each stage are determined by the expert scoring method and entropy weight method,and the interest distribution model based on multi-dimensional risk factors is established.Finally,an example is used to verify the rationality of the method for the benefit distribution of the charging-pile project.The results of the example indicate that the limitations of the Shapley method can be reasonably avoided,and the applicability of the model for the benefit distribution of the charging-pile project is verified. 展开更多
关键词 Charging pile Benefit distribution Risk factor Integrated weighting method Shapley model
A Novel Conceptual Telescopic Positioning Pile for VLFS Deployed in Shallow Water:Structure Design 认领
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作者 XU Sheng-wen LIU Xiao-lei +1 位作者 WANG Xue-feng DENG Yan-fei 《中国海洋工程:英文版》 SCIE EI CSCD 2020年第4期526-536,共11页
A conceptual design of using novel telescopic piles to position a multi-modular very large floating structure(VLFS),which is supposed to be severed as a movable floating airport,is proposed.The telescopic piles can au... A conceptual design of using novel telescopic piles to position a multi-modular very large floating structure(VLFS),which is supposed to be severed as a movable floating airport,is proposed.The telescopic piles can automatically plug in the soil to resist the environmental loads and pull out from the soil to evacuate or move on to the next operational sea.The feasibility demonstration of the conceptual design includes two parts:function verification and structure design.In the latter part of the conceptual design,a time-domain structural analysis is firstly conducted by using Abaqus software.The simulation results suggest that the preliminary structure scheme is not optimum due to the insufficient structure utilization,although both structure safety of the piles and positioning accuracy are guaranteed.To realize a cost reduction of construction and installation,a Genetic Algorithm-Finite Element Analysis(GA-FEA)method is employed to perform structural optimization.After optimization,31 percent of the weight of each pile is reduced and higher structure utilization is maintained.The difference of the self-weight and allowable buoyancy of a single module(SMOD)of a semisubmersible-type VLFS is much larger than the weight of the piles.Combined with the function verification in our previous work,the conceptual design of using the novel telescopic pile to position VLFS is demonstrated to be feasible. 展开更多
关键词 novel telescopic positioning pile feasibility demonstration structural optimization very large floating structure(VLFS)
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Experimental Analysis of Influencing Factors on Heat Exchange Efficiency of Cast-in Place Energy Piles 认领
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作者 陈智 肖彧 +2 位作者 肖衡林 阙梦珂 孙洋 《东华大学学报:英文版》 EI CAS 2020年第1期66-73,共8页
The energy pile is a kind of building energy-saving technology using shallow geothermal energy,and its heat exchange performance is an important factor affecting its development.In this study,heat exchange tests were ... The energy pile is a kind of building energy-saving technology using shallow geothermal energy,and its heat exchange performance is an important factor affecting its development.In this study,heat exchange tests were carried out on three full-size cast-in place energy piles,and the influence of various factors on the heat exchange amount and the heat exchange rate was analyzed.The following conclusions are drawn:(1)the heat exchange rate of the cast-in place energy pile is greatly affected by the inlet water temperature;(2)increasing the pile length can increase the heat exchange amount,but has little effect on improving the heat exchange rate;(3)the increase in the heat exchange amount by heat exchange pipes in series is not significant,and therefore the parallel-type heat exchange pipes should be considered in practical engineering;(4)the appropriate circulating water flow velocity gives the best heat exchange efficiency. 展开更多
关键词 energy PILE CAST-IN PLACE HEAT EXCHANGE AMOUNT HEAT EXCHANGE rate
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一种分析单桩承载性状的新方法 认领
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作者 聂庆科 郅正华 《河北水利电力学院学报》 2020年第2期23-27,共5页
确定桩的承载性状最准确的做法为应力测试法,但造价较高,难以在实践中推广应用。根据荷载传递过程中桩身轴力的界限型和过渡型模型,推导出了用桩身压缩量表示的侧阻和端阻占比表达式,通过引入特征线的概念,建立了在荷载和沉降(Q~S)坐标... 确定桩的承载性状最准确的做法为应力测试法,但造价较高,难以在实践中推广应用。根据荷载传递过程中桩身轴力的界限型和过渡型模型,推导出了用桩身压缩量表示的侧阻和端阻占比表达式,通过引入特征线的概念,建立了在荷载和沉降(Q~S)坐标下用特征线参量分析桩承载性状的理论和方法,经实践验证是可行的。 展开更多
关键词 基桩 特征线 承载性状
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基于剪应力发展型桩承加筋路堤的渐进土拱效应评价 认领
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作者 吕伟华 武涛 +1 位作者 顾凡 高磊 《中南大学学报:英文版》 SCIE EI CAS CSCD 2020年第7期2094-2112,共19页
在桩承式加筋路堤中,土拱效应影响着桩与地基土之间的荷载分担。土工加筋对减少桩土差异沉降作用显著,故路堤中剪应力未能达到临界水平,此时桩承路堤中发生的是部分发展的渐进土拱效应,而大部分现有研究方法由于采用了极限土拱效应原理... 在桩承式加筋路堤中,土拱效应影响着桩与地基土之间的荷载分担。土工加筋对减少桩土差异沉降作用显著,故路堤中剪应力未能达到临界水平,此时桩承路堤中发生的是部分发展的渐进土拱效应,而大部分现有研究方法由于采用了极限土拱效应原理进行路堤荷载分担计算而无法适用。因此,本文提出了一种基于剪应力发展型土拱效应的桩承加筋路堤荷载效应评价模型并对其合理性进行了验证,系统分析了路堤高度与内摩擦角、地基土厚度、桩帽宽与净距比、土工加筋抗拉刚度等设计参数对拱跨比、桩土应力比、土拱度、加筋拉应力和拉应变的影响敏感性。结果表明,桩帽宽与净距比为1:1.0且抗拉刚度为2000 kN/m的单层单向加筋是桩承式加筋路堤的设计敏感阈值。 展开更多
关键词 土工加筋 土拱效应 发展剪应力 参数分析
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下沉过程耦合欧拉-拉格朗日有限元法分析 认领
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作者 霍知亮 郎瑞卿 闫澍旺 《水利与建筑工程学报》 2020年第3期9-13,共5页
在进行基础或结构物下沉贯入的数值分析时,常会遇到接触的处理困难、网格大变形造成的扭曲畸变等问题,引起程序收敛困难、计算失真。应用何种数值分析方法,准确的模拟下沉过程结构物和土的相互作用,已成为此领域的一个重要课题。耦合的... 在进行基础或结构物下沉贯入的数值分析时,常会遇到接触的处理困难、网格大变形造成的扭曲畸变等问题,引起程序收敛困难、计算失真。应用何种数值分析方法,准确的模拟下沉过程结构物和土的相互作用,已成为此领域的一个重要课题。耦合的欧拉-拉格朗日方法结合了欧拉计算方法与拉格朗日计算方法的特点,通过固定的欧拉网格及可以在网格中运动的材料,可有效的处理网格畸变等大变形分析中存在的解法困难,其接触算法可得到基础或结构物准确的应力应变状态。通过砂土中桩的静压下沉、吸力锚的自重下沉和海底管线自沉分析三个应用实例,表明CEL有限元法可有效模拟大变形问题,所得的计算结果有较好的适用性。其分析方法和成果可为其它类型基础结构的下沉分析提供有益参考。 展开更多
关键词 下沉 耦合欧拉-拉格朗日方法 桩基础 吸力锚 海底管线
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竖向荷载下基桩可靠度优化设计方法研究 认领
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作者 徐志军 韩星 +1 位作者 郑俊杰 原方 《华中科技大学学报:自然科学版》 EI CAS CSCD 北大核心 2020年第5期55-60,共6页
为解决繁琐的计算制约着可靠度优化设计方法应用于桩基工程这一问题,分析了竖向荷载下基桩的破坏模式,利用可靠度理论和优化设计方法建立了可靠度优化设计模型.基于中心点法,提出了一种改进的可靠度优化计算方法,用以解决可靠度优化计... 为解决繁琐的计算制约着可靠度优化设计方法应用于桩基工程这一问题,分析了竖向荷载下基桩的破坏模式,利用可靠度理论和优化设计方法建立了可靠度优化设计模型.基于中心点法,提出了一种改进的可靠度优化计算方法,用以解决可靠度优化计算中产生的非线性迭代繁琐过程.建立了可靠度指标的修正函数以提高计算精度,并利用线性回归方法给出了修正函数的计算方法.实例分析结果表明:改进的可靠度优化方法在提高计算效率的同时也保证了计算精度;局部优化和全局优化后的目标函数值分别减小了20.2%和24.9%,较大程度地降低了施工成本. 展开更多
关键词 基桩 可靠度优化设计 竖向荷载 目标函数 非线性迭代
Study of seismic behavior of PHC piles with partial normal-strength deformed bars 认领
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作者 Zhang Xizhi Zhang Shaohua +1 位作者 Xu Shengbo Niu Sixin 《地震工程与工程振动:英文版》 SCIE EI CSCD 2020年第2期307-320,共14页
Nine PHC piles with partial normal-strength deformed bars were prepared in present study,and cyclic loading tests were implemented to evaluate these piles’seismic performance.The influence of the axial compression ra... Nine PHC piles with partial normal-strength deformed bars were prepared in present study,and cyclic loading tests were implemented to evaluate these piles’seismic performance.The influence of the axial compression ratio and the amount of normal-strength deformed bars on failure modes,crack patterns,strength,stiffness,and ductility were examined.The test findings indicate that the change of axial compression ratio has a noticeable influence on the failure mode of PHC piles.A larger axial compression ratio results in a higher cracking bending resistance,ultimate bending resistance,and initial stiffness,but the propagation heights of flexural cracks decrease as the axial compression ratio increases.Furthermore,increasing the amount of normal-strength deformed bars causes a slight decrease in ductility.Finally,a calculation formula was proposed to predict the flexural capacity of PHC piles with partial normal-strength deformed bars. 展开更多
关键词 PHC PILE PRESTRESSED TENDONS DEFORMED bars seismic behavior cyclic loading test FLEXURAL capacity
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