带BRB的大跨度空间钢桁架结构减震性能分析  

Damping performance analysis of large-span spatial steel truss structure with BRB

作　　者：王秀丽[1,2] 乔丽梅 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《兰州理工大学学报》2015年第5期120-124,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51278236);国家科技支撑计划项目(2011BAK12B07)

摘　　要：以大跨度空间钢桁架结构为研究对象,考虑钢桁架屋盖与支承结构共同工作,采用非线性时程分析的方法,研究屈曲约束支撑在整体结构中的应用及减震效果.通过对不同的BRB布置方案进行分析得出:BRB的布置方式直接影响其对整体结构的减震效果.仅在上部桁架中设置BRB时,减震效果有限;在下部支承结构中设置BRB可有效减小结构水平位移和钢桁架杆件的内力.综合考虑减震效果和经济因素,对于大跨度空间钢桁架整体结构,在下部支承结构中合理布置BRB,减震效果理想.Taking large-span spatial steel truss structure as research object and taking cooperative work of the steel truss roof with the supporting structure into account,the application of buckling restraint brace（BRB）in integral structure and its damping effect was investigated with nonlinear time history analysis method.It was known through analysis of different BRB layout options that they have a direct influence on the damping effect of the integral structure.The damping effect would be limited by setting BRB only on upper steel truss.By setting it in the lower supporting structure,the horizontal displacement of the structure and the internal force of the steel truss rods could be reduced effectively.By comprehensive consideration of damping effect and economic factor,setting BRB in the lower support structure reasonably would make ideal damping effect for the large-span spatial steel truss structure.

关 键 词：大跨空间钢桁架 整体协同工作 屈曲约束支撑 减震性能 

分 类 号：TU312[建筑科学—结构工程] TU391