大型索结构断索动力响应研究  

Study on dynamic response of large cable structure after cable break

作　　者：梁宸宇[1] 朱忠义[1] 张琳[1] 白光波[1] 王玮 陈一[1] 王哲[1] LIANG Chenyu;ZHU Zhongyi;ZHANG Lin;BAI Guangbo;WANG Wei;CHEN Yi;WANG Zhe(Beijing Institute of Architectural Design,Beijing 100045,China)

机构地区：[1]北京市建筑设计研究院有限公司,北京100045

出　　处：《建筑结构学报》2023年第4期42-53,共12页Journal of Building Structures

基　　金：北京学者计划资助。

摘　　要：在大型索结构中,拉索作为主要受力构件承担较大的荷载。分析断索对结构的影响,成为大型索结构抗连续倒塌设计的关键。选取FAST望远镜、国家速滑馆、卡塔尔卢塞尔体育场、三亚国际体育产业园体育场、日照奎山体育中心体育场、大连梭鱼湾专业足球场等多个大型索结构工程,针对结构中典型拉索发生断索的情况,采用动力分析方法研究断索后结构的动力响应,总结索网(双向正交、三角形网格)、轮辐式索桁架(单环索、双环索、内环带刚性挑棚)等不同类型索结构断索后动力响应的特点以及断索引发的动力系数。研究结果表明:除三角形网格单层索网外,其他类型的索网、轮辐式索桁架等索结构在断索后的动力系数均出现大于规范推荐取值的情况,推荐采用动力分析方法进行断索分析;双向正交单层索网刚度、稳定性和内力重分布能力较三角形网格单层索网小,拉索断索产生的动力效应较大;索桁架交错布置的单环索轮辐式索桁架结构同双环索轮辐式索桁架结构相比,径向索、环索断索后相互产生的动力效应较小;对于轮辐式索桁架结构,当上弦设有与径向索同向布置的膜拱及交叉次索时或当环索处设有刚性挑棚时,可有效降低断索产生的动力效应。In large cable structures,cables are the main load-bearing members.The analysis of the influence of cable break on the structure is the key to the design of large cable structures against progressive collapse.A number of large cable structure projects,such as Five-hundred-meter Aperture Spherical Telescope(FAST),National Speed Skating Oval,Qatar Lusail Stadium,Sanya International Sports Industry Park,Rizhao Kuishan Sports Center Stadium,Dalian Barracuda Bay Soccer Arena,were selected to study the dynamic response of structures after cable break using the dynamic analysis method according to the situation of typical cable breaking in these structures,and the characteristics of dynamic response and dynamic coefficients of cable structures,such as cable net(bidirectional orthogonal,triangular mesh)and spoke-type cable truss(single ring cable,double ring cable,inner ring with rigid canopy),after cable break were summarized.The analysis results show that,except for triangular mesh single-layer cable net,the dynamic coefficients of other types of cable net and spoke-type cable truss are greater than the recommended values in code after cable break,so dynamic analysis method is recommended for cable break analysis.Rigidity,stability and internal force redistribution ability of bidirectional orthogonal single-layer cable net are less than those of triangular mesh single-layer cable net,so the dynamic effect caused by cable break is larger.Compared with the double-looped spoke-type cable truss structure,the mutual dynamic effect after cable break between radial cables and looped cables of the single-looped spoke-type cable truss structure with staggered arrangement is smaller.For spoke-type cable truss structures,when the top chord of the cable truss is provided with membrane arches and cross secondary cables which are arranged in the same direction as the radial cable,or when there is a rigid canopy around the ring cable,the dynamic effect of cable break can be effectively reduced.

关 键 词：索结构 索网 轮辐式索桁架 断索 动力响应 动力系数 

分 类 号：TU394[建筑科学—结构工程] TU318