单层柱面网壳抗连续倒塌性能
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国家自然科学基金(51525803);教育部博士点基金(20130032110044);天津市建交委科技项目(2014-02)


Progressive collapse performance of cylindrical latticed shell
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National Science Foundation of China (No.51525803); Doctorate Fund of Ministry of Education (No.20130032110044); Tianjin Municipal Committee of Construction and Transportation Fund (No.2014-02)

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    摘要:

    研究了不同荷载布置形式、支承方式条件下,单层柱面网壳的抗连续倒塌性能和倒塌破坏模式,采用基于构件承载能力的敏感性评价指标,分析了初始缺陷、压杆失稳等因素对杆件、节点敏感性指标的影响。结果表明,当采用四边支承时,满跨均布荷载起控制作用,跨中节点为敏感构件,与之相邻斜杆为关键构件;当采用纵向两边支承时,半跨均布荷载起控制作用,杆件和节点的敏感性指标在1/3跨处最大,支座处最小。当考虑初始缺陷时,杆件、节点重要性系数分别增大了41%和53%;当考虑压杆失稳时,杆件和节点重要性系数分别增大了45%和62%。通过对关键构件进行加强,可以优化该类结构的抗连续倒塌性能。

    Abstract:

    We studied the progressive collapse performance of cylindrical latticed shell and its failure modes indifferent load distribution and boundary conditions. By using the sensitivity assessment index based on the ultimate bearing capacity of components, the influence of imperfection and buckling of compressive rods on the sensitivity index of the rods and nodes. The results show that in the four-side boundary condition, the full uniform-distribution load is mainly controlling. Nodes at the mid-span are the sensitive components and the adjacent rods are the key components. In two-side longitudinal boundary condition, the half uniform-distribution load is basically controlling. The largest sensitivity index of the rods and nodes are found at 1/3 span, and the smallest is adjacent to the support. Considering the structural imperfection, the important coefficients of the rods and nodes increase by 41% and 53% respectively; and considering the effect of buckling of compressive rods, increase by 45% and 62% respectively. So we can optimize the progressive collapse performance of cylindrical latticed shell by strengthening the key components.

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杨秀来,徐颖,韩庆华.单层柱面网壳抗连续倒塌性能[J].土木与环境工程学报(中英文),2016,38(1):100-108. Yang Xiulai, Xu Ying, Han Qinghua. Progressive collapse performance of cylindrical latticed shell[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2016,38(1):100-108.10.11835/j. issn.1674-4764.2016.01.014

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  • 收稿日期:2015-01-09
  • 在线发布日期: 2016-03-01
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