设置屈曲约束支撑的斜交网筒结构延性有限元分析  

Finite element analysis of structural ductility for diagrid tube structure with buckling restrained braces

作　　者：赵丰[1] 张崇厚[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《建筑结构学报》2013年第7期56-61,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(50878116)

摘　　要：斜交网筒结构具有较大的抗侧刚度,但其延性较差,通过设置屈曲约束支撑可改善斜交网筒结构延性。以30层的斜交网筒结构模型为研究对象,分别对普通斜交网筒结构和设置屈曲约束支撑斜交网筒结构进行静力弹塑性推覆(Pushover)分析。结果表明:屈曲约束支撑可有效改善斜交网筒结构延性。此外,对立面中部、立面角部、底部楼层、上部楼层共4种局部区域布置屈曲约束支撑的方案进行了结构延性分析。局部设置屈曲约束支撑斜交网筒结构的设计应确保斜柱处于弹性工作状态,屈曲约束支撑率先进入塑性耗能状态。建议采用立面中部布置屈曲约束支撑的方案,可实现在保证结构受剪承载力的前提下,较好地改善斜交网筒结构的延性,避免结构发生脆性破坏。Diagrid tube structures have excellent lateral force resistance but poor structural ductility,which can be improved through buckling restrained brace.With respect to 30-story diagrid tube structures,nonlinear static analysis,i.e.pushover analysis was conducted respectively for the conventional diagrid tube structure and those with buckling restrained brace.The results show that the structural ductility is improved by utilizing buckling restrained brace.Furthermore,four schemes of diagrid tube structures partially with buckling restrained brace in different parts of the facades,including the corner and the middle,the bottom and the upper,were investigated for structural ductility.Diagrid tube structures partially with buckling restrained brace should be designed so that conventional brace remain in elastic state,while buckling restrained brace turn into plastic state in advance for energy dissipation.Diagrid tube structure with buckling restrained brace in the middle part of facade is recommended,which could effectively improve structural ductility to avoid brittle failure without decreasing shear load-bearing capacity.

关 键 词：斜交网筒结构 结构延性 屈曲约束支撑 PUSHOVER分析 

分 类 号：TU973.2[建筑科学—结构工程] TU311.41