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大跨度钢结构抗连续倒塌动力分析 预览

DISCUSSION ON CONTINUOUS COLLAPSE PREVENTION OF LONG-SPAN STEEL STRUCTURE
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摘要 利用有限元法对某大跨度钢结构进行连续倒塌动力分析。采用能量法和平均应力法来确定失效柱位置,在考虑列车行驶等偶然荷载的作用下,选定柱22、柱11进行连续倒塌分析。研究结果表明:柱11单根失效时,结构最大应变为2.38×10-3,小于钢材极限拉应变。其中远离柱11靠近柱12和柱21梁单元处产生高架层最大应力,网壳最大应力、应变出现在失效柱的网壳斜柱及相邻区失效柱;柱22单根失效时,应变最大值为3.68×10-3,失效柱附近梁单元产生最大应变,小于材料极限拉应变。站房网壳最大应力、应变出现在柱11支撑网壳斜柱以及邻近的网壳单元;柱11、柱22同时失效时,结构最大应变为5.78×10-3,较单根柱失效时应变值大幅提高,已发生塑性变形,但仍未超出材料极限塑性应变限值,双柱失效并未引发整体结构的连续性倒塌。 The finite element method was used to analyze the continuous collapse of a long-span steel structure. Using the energy method and the mean stress method to determine the position of the failure column, the continuous collapse analysis of 22 and 11 columns was selected under the influence of the train running and other accidental loads. The results showed that the maximum structure strain was 2.38×10-3, which was less than the ultimate tensile strain of steel. Among them, the maximum stress of the elevated layer was generated from the column 11 near column 12 and column 21, and the maximum stress strain of the net shell appearred in the column of the failure column and the failure column of the adjacent zone. When the single pillar 22 failed, the strain maximum was 3.68×10-3, and the maximum strain of the beam element near the failure column was less than that of the ultimate tensile strain of material. The maximum stress strain of the housing reticulated shell was found in the column 11 supporting the external bridge and the adjacent net shell elements;When the double column 11 and the column 22 failed simultaneously, the maximum strain of the structure was 5.78×10-3, which was greatly increased compared with the failure of the single column. The plastic deformation occurred and the value was still below the ultimate plastic strain of the material. The failure of the double column could not lead to the continuous collapse of the overall structure.
作者 孙磊 黄磊 SUN Lei;HUANG Lei(Building Engineering College,Hohhot Vocational College,Hohhot 010051,China;Water Conservancy and Civil Engineering College,Inner Mongolia Agricultural University,Hohhot 010018,China)
出处 《钢结构》 2019年第1期38-43,共6页 Steel Construction
基金 内蒙古自治区高等学校研究项目(NJZY16450).
关键词 钢结构 连续倒塌 应力、应变 steel structure continuous collapse stress and strain
作者简介 第一作者:孙磊,男,1983年出生,讲师。Email:sunlei0407@sina.com.
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