正放四角锥网架敏感性分析及抗连续倒塌性能

发布时间：2018-01-08 14:08

本文关键词：正放四角锥网架敏感性分析及抗连续倒塌性能　出处：《天津大学学报(自然科学与工程技术版)》2017年06期 　论文类型：期刊论文

【摘要】：为揭示正放四角锥网架的连续倒塌破坏机理,采用备用荷载路径法并结合基于构件承载能力的敏感性评价指标,对正放四角锥平板网架进行动力非线性分析,模拟了结构的连续倒塌破坏过程,分析了厚跨比、跨度和支承形式对网架结构抗连续倒塌性能的影响.分析结果表明,周边点支承正放四角锥网架结构中部下弦杆、中间支座处腹杆为敏感构件,结构中部上弦杆、中间支座周围腹杆和上弦杆为关键构件;周边支承网架冗余度指标分布规律与周边点支承网架相似,冗余度指标小于周边点支承网架;点支承网架角支座腹杆和上弦杆为敏感构件,敏感构件相邻腹杆及中间支座腹杆为关键构件.通过加强关键构件的截面尺寸,可以显著提高结构的抗连续倒塌性能.正放四角锥网架冗余度指标分布规律不随厚跨比、跨度的变化而改变,冗余度指标大小与网架厚跨比、设计应力比成正比,而与模型跨度关系不大.
[Abstract]:In order to reveal the damage mechanisms is four square pyramid space grid, the alternative load path method combined with the sensitivity evaluation index the bearing capacity of components based on dynamic nonlinear analysis of plate truss is four square pyramid, to simulate the failure process of the progressive collapse of the structures, analyzes the influence of the thickness to span ratio, span and supporting forms of anti continuous collapse performance of truss structure. The analysis results show that the surrounding supporting point is four square pyramid space grid structure in the middle and lower chord at the support brace for sensitive components, structure of the central chord, intermediate support around the web member and upper chord as a key component; the supporting frame redundancy distribution and support network similar to the surrounding and the redundancy index less than surrounding support network; support network support web member and upper chord angle sensitive component, sensitive components adjacent brace and intermediate support for key web member The section size of components. Through the strengthening of key components, can significantly improve the structure of the progressive collapse resistance. Is four square pyramid space grid redundancy distribution does not vary with the thickness to span ratio, span changes, size and network redundancy thickness to span ratio, design stress ratio is proportional to, rather than model of span.

【作者单位】：天津大学建筑工程学院;滨海土木工程结构与安全教育部重点实验室(天津大学);天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金资助项目(51525803) 住房和城乡建设部科学技术计划资助项目(2016-K5-010)~~
【分类号】：TU356
【正文快照】： 2.滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072;3.天津大学水利工程仿真与安全国家重点实验室,天津300072)近年来,各类建筑结构在极端荷载作用下的连续倒塌事故引起了社会各界的广泛关注.1968年伦敦Ronan Point公寓因煤气爆炸而发生连续倒塌破坏[1],结构抗

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