低周反复荷载作用下交错桁架钢结构抗震性能试验研究与分析  

Experimental study and analysis on seismic behavior of steel staggered truss framing system under cyclic loading

作　　者：周绪红[1,2] 龚焮[2] 聂少锋[2] 周期石[3] 

机构地区：[1]兰州大学,甘肃兰州730000 [2]长安大学,陕西西安710061 [3]中南大学,湖南长沙410075

出　　处：《建筑结构学报》2009年第1期133-141,共9页Journal of Building Structures

基　　金：国家自然科学基金资助项目(50078021);教育部高等学校博士学科点专项基金项目(2000053203)

摘　　要：进行了1∶8缩尺比例钢结构交错桁架的低周反复荷载试验,深入研究了钢结构交错桁架结构的屈服荷载、最大荷载、极限荷载、滞回曲线、骨架曲线及位移延性和耗能能力等抗震性能。通过建立考虑材料非线性和几何非线性影响的有限元模型对试验模型进行模拟分析,规律方面基本吻合。采用有限元方法分析了不同结构高度、桁架形式、底层桁架落地布置、结构空腹节间距、结构高宽比以及桁架跨高比对钢结构交错桁架结构抗震性能的影响。研究表明:桁架落地混合式交错桁架结构的位移延性系数和能量耗散系数比桁架不落地式的分别高9%和17%;随着结构高度增大,空腹节间距增大、高宽比增大和跨高比的减小,钢结构交错桁架结构的抗震性能均有所降低。最后给出了交错桁架结构相应参数的合理取值范围和设计建议,可供工程设计参考。A 1： 8-scale steel staggered truss system model was tested under cyclic loading to study the seismic behavior, including yield, maximum, ultimate load carrying capacities, hysteretic characteristics, displacement ductility and energy dissipation capacity. The finite element model, which considers material nonlinearity and geometric large deformation, was used to simulate the test model. The results of FEM agreed well to the test results. A follow up detailed parametric study by FEM were then performed. The parameters include structural form, building height, vierendeel panel length,the ratio of structural height and width and the ratio of truss span and height. The analytical results show that the ductility factor and energy dissipation coefficient of ground mixed staggered truss are higher than that of un-ground mixed staggered truss for about 9% and 17%, respectively, With the increase of building height, vierendeel panel length, the ratio of building height and width, the seismic behavior of staggered truss decreased. And with the increase of the ratio of truss span and its height, the seismic behavior of staggered truss increases. Finally, the reasonable value of parameters and design recommendations are proposed for the seismic resistant design of the steel staggered truss framing system.

关 键 词：钢结构交错桁架 低周反复荷载 非线性有限元模型 抗震性能 

分 类 号：TU323.4[建筑科学—结构工程]