基于构形刚度的柱面网壳等稳定性优化设计  

Optimization design of equal stability for cylindrical reticulated shells based on configuration stiffness

作　　者：史若琪 孙建恒[1] 王军林[1] 路维[1,2] 张澜 SHI Ruo-qi;SUN Jian-heng;WANG Jun-lin;LU Wei;ZHANG Lan(College of Urban and Rural Construction,Hebei Agricultural University,Baoding 071001,China;Hebei University of Water Resources and Electric Engineering,Cangzhou 061001,China)

机构地区：[1]河北农业大学城乡建设学院,河北保定071001 [2]河北水利电力学院,河北沧州061001

出　　处：《空间结构》2023年第3期12-20,共9页Spatial Structures

基　　金：河北省自然科学基金项目(E2020204031).

摘　　要：通过节点和局部构形刚度参数,准确预测了单层柱面网壳施加缺陷前后的失稳节点及失稳区域.分析得出,结构存在初始缺陷后,稳定承载力降低是由于初始缺陷的存在降低了结构部分节点及区域的构形刚度,形成了薄弱区域.依据结构等稳定性优化思路,利用改变部分杆件截面尺寸进行局部构形刚度调整,使结构构形刚度趋于均匀,从而提升单层柱面网壳结构的稳定性能.各优化方案结果比较表明,构形刚度均匀化可有效确定单层柱面网壳的优化区域、杆件优化数量以及截面优化程度,快速提高网壳结构的稳定承载力并使结构接近等稳定性.单层柱面网壳稳定性的高效优化方向为横向跨度方向.For single-layer cylindrical reticulated shells,the initial instability nodes and areas of the perfect as well as imperfect structure are accurately identified by local configuration stiffness parameters.The decrease of the buckling load is found out to be caused by the existence of the initial imperfection which reduces the stiffness of some nodes and areas of the structure.This leads to the emergence of weak areas in the structure.According to the optimization idea of equal stability of structures,the local area configuration stiffness is adjusted by changing the member section sizes to homogenize the overall configuration stiffness and optimize the stability of the single-layer cylindrical reticulated shell.The analysis results of optimization scheme show that using the uniformity of configuration stiffness can effectively determine the optimization areas,number and optimization degree of the member cross section.It can also quickly improve the buckling load of structure by making the structure close to equal stability.In addition,the span direction proves to be the efficient optimization direction for the stability of single-layer cylindrical reticulated shells.

关 键 词：单层柱面网壳 稳定承载力 局部构形刚度参数 构形刚度均匀化 等稳定性能优化 

分 类 号：TU393.3[建筑科学—结构工程]