单层柱面网壳抗连续倒塌性能

发布时间：2018-03-02 13:17

本文选题：单层柱面网壳　切入点：重要性系数　出处：《土木建筑与环境工程》2016年01期 　论文类型：期刊论文

【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]:The continuous collapse resistance and collapse failure mode of single-layer cylindrical latticed shells under different load arrangement and supporting mode are studied. The initial defects are analyzed by using the sensitivity evaluation index based on the load-carrying capacity of members. The results show that the full span uniform load plays a controlling role when the four sides are supported, the middle node of the span is a sensitive member, and the adjacent skew bar is the key member. When the longitudinal support is adopted, the half span uniform load plays a controlling role. The sensitivity index of the members and joints is the largest at the 1/3 span and the minimum at the support. The importance coefficients of the joints increase by 41% and 53, respectively, and the coefficients of importance of the members and joints increase by 45% and 62 respectively when considering the instability of the compression rods. The continuous collapse resistance of this kind of structures can be optimized by strengthening the key members.
【作者单位】：天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：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)~~
【分类号】：TU399

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