【作者】 姜正荣； 李冬村； 石开荣； 王仕统；

【Author】 Jiang Zhengrong;Li Dongcun;Shi Kairong;Wang Shitong;School of Civil Engineering and Transportation,South China University of Technology;State Key Laboratory of Subtropical Building Science,South China University of Technology;

【机构】 华南理工大学土木与交通学院； 华南理工大学亚热带建筑科学国家实验室；

【摘要】 采用多段直梁法模拟杆件初弯曲,在考虑结构整体的初始几何缺陷前提下,提出考虑杆件初弯曲的随机缺陷模态法,通过对凯威特联方型单层网壳模型结构进行弹塑性屈曲分析,探索杆件初弯曲对网壳结构稳定承载力的影响。结果表明:对于仅考虑杆件初弯曲的凯威特联方型单层网壳,其稳定极限承载力相比于理想网壳显著降低;与仅考虑结构整体的初始几何缺陷的计算结果相比,杆件初弯曲引起的结构稳定承载力降幅不明显,当杆件初弯曲幅值较大时,杆件初弯曲对结构稳定承载力的影响不可忽略;随着初弯曲幅值增大,结构整体的初始几何缺陷对结构稳定承载力的影响程度减弱。更多还原

【Abstract】 Multiple-segment straight beam method was used to simulate initial curvature of members,and random imperfection mode method with initial curvature of members included was proposed under prerequisite of considering initial geometric imperfection of the whole structure.Elasto-plastic buckling analysis was carried out on Kiewitt-Lamella single layer reticulated shell structure to figure out the influence of initial curvature of members on stability bearing capacity of reticulated shell structure.The results show that stability bearing capacity of Kiewitt-Lamella single layer reticulated shell structure decreases significantly only with initial curvature of members considered,in comparison with perfect reticulated shell strcuture.The reduction of stability bearing capacity of Kiewitt-Lamella single layer reticulated shell structure,which includes initial geometric imperfection of the whole structure,is not remarkable caused by initial curvature of members,but when the amplitude of mitial curvature of members is comparatively large,the influence of initial curvature on stability bearing capacity cannot be ignored.With the increase in amplitude of initial curvature,the influence of initial geometric imperfection of the whole structure on stability bearing capacity is weakened.更多还原