杆件随机初弯曲对半刚性连接单层网壳稳定承载能力影响研究  

Influence of random initial curvature of members on stability bearing capacity of semi-rigid single-layer reticulated domes

作　　者：孙庆巍 郑娅洁 赵中伟 高莜然 SUN Qing-wei;ZHENG Ya-jie;ZHAO Zhong-wei;GAO You-ran(School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《空间结构》2022年第2期10-18,共9页Spatial Structures

基　　金：中国博士后科学基金项目(2017M621156)。

摘　　要：单层网壳结构是一种缺陷敏感型结构,其稳定承载能力受节点刚度和杆件初弯曲的影响较大.为更有效地研究节点半刚性和杆件随机初弯曲对网壳稳定承载能力的影响,引入双单元法实现了对网壳节点半刚度特性的模拟,运用了一种同时考虑节点刚度和杆件初弯曲的数值方法,分析了节点刚度、杆件初弯曲大小和方向的随机性对网壳屈曲承载能力的影响.深入研究了屈曲荷载系数的概率分布,得到其概率分布规律,拟合了关于网壳屈曲荷载系数的对数均值和对数标准差随节点刚度系数变化的折减系数公式.据此可高效简便地推导出网壳屈曲荷载系数的置信区间,从而得到网壳的极限屈曲荷载,为单层网壳结构的稳定承载能力分析提供了一种准确实用的分析方法.Single-layer reticulated domes are sensitive to imperfections, and their stability bearing capacity is greatly affected by the joint stiffness and the initial curvature of members. In order to study the influence of semi-rigid joints and random initial curvature of members on the stability bearing capacity of reticulated shells more effectively, the double element method is introduced in this paper to simulate the semi-rigid characteristics of reticulated dome joints. Meanwhile, a numerical method considering joint stiffness and initial curvature of members is also adopted. The randomness of joint stiffness, the initial curvature magnitude and direction of members were all considered in the analysis. The probability distribution of buckling load coefficient is studied, concluding the probability distribution law and a reduction coefficient curve formula for the coefficient of buckling load on reticulated shell as logarithmic mean and logarithmic standard deviation change with joint stiffness coefficient. Thus, the confidence interval of the buckling load coefficient of the semi-rigid reticulated shell can be derived efficiently. Thereafter, the ultimate buckling load of the reticulated shell is obtained. It provides an accurate and practical method for stability bearing capacity analysis of single-layer reticulated domes.

关 键 词：单层网壳 杆件随机初弯曲 节点刚度 半刚性 稳定承载能力 

分 类 号：TU393.3[建筑科学—结构工程]