初始缺陷模式对单层球面网壳静力稳定性的影响  

Influence of initial geometric imperfection on static stability of single-layer reticulated shell structure

作　　者：支旭东[1,2] 李文亮[1,2] 范峰[1,2] 沈世钊[1,2] ZHI Xu-dong;LI Wen-liang;FAN Feng;SHEN Shi-zhao(Key Lab of Structure Dynamic Behariour and Control,Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters,Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程智能防灾减灾工信部重点实验室,黑龙江哈尔滨150090

出　　处：《空间结构》2021年第1期9-15,共7页Spatial Structures

基　　金：国家杰出青年科学基金项目(51525802);国家重点研发计划项目(2018YFC1504304)。

摘　　要：初始几何缺陷模式是单层网壳结构静力稳定性分析、杆件截面设计时必须考虑的重要影响因素.通过采用工程设计中常用的几种初始缺陷分布模式,对考虑初始几何缺陷单层球面网壳结构的静力稳定性进行分析,发现现行规程所推荐的缺陷模式并不能完全保证设计的可靠性,具体表现为一致缺陷或特征值缺陷都可能成为最不利的缺陷模式.针对不同初始几何缺陷模式对单层球面网壳结构静力稳定性的影响进行了分析,对于不同跨度、矢跨比和屋面荷载的网壳结构的杆件截面进行了设计与讨论.Initial geometric imperfection of single-layer reticulated shell is an important consideration for the analysis of static stability and selection of cross section for shell members. In this paper, different initial geometric imperfection has been used to analyze the static stability of reticulated shell, indicating that the initial geometric imperfection recommended in current specification can not fully guarantee structural safety of reticulated shell, neither consistent imperfection nor eigenvalue imperfection is the most unfavorable imperfection. Based on four different kinds of initial imperfections, this paper analyzes the static stability of reticulated shell, and discusses the design of common cross section of shell members according to span, ratios of rise to span and load of the roof.

关 键 词：单层球面网壳 静力稳定性 初始几何缺陷 静力安全系数 杆件截面 

分 类 号：TU393.3[建筑科学—结构工程]