考虑楼板组合作用的方钢管混凝土组合框架受力性能试验研究  

Experimental study on load-bearing behavior of rectangular CFST frame considering composite action of floor slab

作　　者：聂建国[1] 黄远[1] 樊健生[1] 

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《建筑结构学报》2011年第3期99-108,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(50438020);长江学者和创新团队发展计划项目(IRT00736)

摘　　要：为研究钢梁与混凝土楼板的组合作用对钢-混凝土组合框架体系的刚度、承载力及耗能能力的影响,并考察组合框架结构在大震作用下进入弹塑性阶段的受力性能,进行了2榀足尺方钢管混凝土组合框架的低周反复荷载试验。2榀组合框架分别为组合梁-钢管混凝土框架及纯钢梁-钢管混凝土框架。试验中结构的最大层间位移角达到1/21。试验结果表明:组合框架结构具有稳定的滞回性能及良好的延性;钢梁与混凝土楼板的组合作用能显著提高结构的刚度、强度及耗能能力,并且能有效保证钢梁上翼缘的局部稳定性及钢梁的整体稳定性;楼板组合作用将使钢梁下翼缘应变显著增大,导致楼盖梁转动能力的减小;两个试件的破坏均是由梁端失效引起,说明试验中采用的梁翼缘贯通式节点能够满足强柱弱梁、强节点弱构件的抗震设计要求。In order to investigate the effects of composite action on the stiffness,strength and energy dissipating capacity of steel-concrete composite frame,and examine the elasto-plastic behavior of composite frame system under rare seismic load,two full-scale rectangular CFST composite frames with and without composite floor slab were tested under cyclic loading to a maximum inter storey drift angle of 1/21 rad.The experimental results indicate that the composite frames exhibit steady hysteretic behavior and excellent ductility.The stiffness,strength and the energy-dissipating capacity of the frame will increase significantly with the composite action between the steel beam and floor slab.The buckling behavior of the top flange and the global stability of the steel beam will be improved with the presence of RC floor slab,while the bottom flange of the composite beam will strain remarkably resulting in a certain decrease of the beam rotation capacity.The failure of the two specimen was triggered from the damage at the beam end,which demonstrates that the through-beam-flange type connection satisfies the strong column-weak beam and strong joint-weak member mechanisms as required by seismic design code.

关 键 词：钢管混凝土 组合框架 组合作用 拟静力试验 受力性能 

分 类 号：TU973.14[建筑科学—结构工程] TU317.1