基于节点刚度的柱面巨型网格结构静力性能研究  

Static performance research on cylindrical reticulated mega-structure based on joints stiffness

作　　者：李峰[1] 娄巧娜 刘涛 左松林[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安山鼎建筑工程设计咨询有限公司,陕西西安710065 [3]中国建筑西北设计研究院,陕西西安710016

出　　处：《西安建筑科技大学学报（自然科学版）》2014年第5期682-686,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省教育厅基金项目(12JK0910);西安建筑科技大学科研基金项目(JC1002);西安建大钢结构创新团队资助计划

摘　　要：建立半刚性节点柱面巨型网格结构数值分析模型,考虑几何非线性和初始缺陷的影响,分别研究节点轴向半刚性、弯曲半刚性及双半刚性结构的静力性能,还提出了双半刚性节点研究的不断逼近计算方法.结果表明:只考虑节点轴向刚度时,若其增加,静力稳定承载力随之增大;只考虑节点弯曲刚度时,静力稳定承载力变化较小;两者同时考虑时,结构承载力较只考虑轴向刚度时明显降低,可见节点的轴向刚度和弯曲刚度叠加效应明显.进而考虑此叠加效应,研究了焊接球节点结构的静力性能,发现节点刚度变化会引起结构内力与位移的显著变化,可见实际工程中节点半刚性的影响不能忽视.Numerical model of cylindrical reticulated mega-structure with semi-rigid joints was established.Considering the geometric nonlinearity and initial defects,the structural static performance was respectively studied with axial semi-rigid joints,bending semi-rigid joints and double semi-rigid joints.The results show that when considering only the axial stiffness of the nodes,if it increases,the static stability capacity increases;when considering only the bending stiffness,the static stability bearing capacity changes little;and considering both,the structural bearing capacity will be significantly reduced compared to only considering the axial stiffness.So,additive effect of joint axial stiffness and bending stiffness is obvious.Considering this additive effect,the static properties of welded ball node structure was studied.The results show that the change of joint stiffness will cause significant changes in the internal forces and displacements of the structure.So,in the actual project,node semi-rigid impact cannot be ignored.

关 键 词：柱面巨型网格 节点刚度 静力性能 有限元分析 焊接球节点 

分 类 号：TU356[建筑科学—结构工程]