不同载荷水平下球面网壳结构的可靠度及敏感性研究  

RELIABILITY AND SENSITIVITY ANALYSIS OF SPHERICAL LATTICE SHELL STRUCTURES UNDER DIFFERENT LOAD LEVELS

作　　者：李会军[1] 冯雪[1] 冯晓波 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]临海市住房和城乡建设规划局东部分局,浙江临海317021

出　　处：《钢结构》2014年第11期1-9,共9页Steel Construction

基　　金：国家自然科学基金资助项目(51408490);中央高校基本科研业务费(QN2012027);2012年西北农林科技大学博士科研启动基金(2012BSJJ002);2014年大学生创新创业训练计划资助项目(1201410712113)

摘　　要：以不同载荷水平作用下凯威特型球面网壳的可靠度与敏感性作为重点研究内容。根据杆件在网壳中的受力特点及分布方式,将杆件划分为7大类,深入探讨各类杆件的几何与物理参数的随机性对网壳结构可靠度、敏感性的影响规律;将网壳结构的最大变形、应变能、杆件屈服数和塑性应变定义为响应指标,研究荷载、弹性模量、屈服强度、杆件横截面面积和几何参数等随机变量对以上4个指标的影响程度;最后,得到不同荷载水平作用下网壳结构4个指标之间的相关性的变化规律。所得结论可为双层球面网壳结构的设计、优化提供参考与借鉴。This paper was focused on reliability and sensitivity of Kiewitt double-layer spherical lattice shells under different load levels. Further research was conducted for the effect of all random variables on reliability, chords of shell are divided into seven types according to load characteristics and the layout of members. Influences of geometric and physical parameters of all kinds of members on reliability and sensitivity of shell were deeply investigated. The maximal deformation, strain energy, number of yielding members and plastic strain of shell were defined as response indexes, and influence of load, Young＇s Modulus, yielding strength, and cross-sectional area of members on the above-mentioned indexes were studied thoroughly. Finally, variation law of correlation between response indexes was obtained. Numerical results would provide reference for design and optimization of doublelayer spherical lattice shell.

关 键 词：球面网壳 荷载水平 失效概率 可靠度 敏感性 

分 类 号：TU399[建筑科学—结构工程] TU311.2