中高强度钢材钢框架梁柱组合节点抗震性能试验研究  

Experimental study on the seismic performance of beam-to-column composite connections in medium-high strength steel frame structures

作　　者：石永久[1] 奥晓磊[2] 王元清[1] 施刚[1] 

机构地区：[1]清华大学,北京100084 [2]北京市建筑设计研究院,北京100045

出　　处：《土木工程学报》2009年第4期48-54,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(90815004、50708051)

摘　　要：为了研究中高强度钢材的采用对钢框架梁柱组合节点抗震性能的影响,通过4个足尺钢框架梁柱组合节点试件在往复荷载作用下的破坏试验,获得了节点承载性能、滞回性能和破坏模式。试验从钢材强度、混凝土楼板配筋率、加载方式等影响因素出发,用承载力、极限转角、环线刚度、延性与耗能能力等指标评价节点的抗震性能。由试验结果可以看出:节点主要破坏模式为钢梁下翼缘局部屈曲和混凝土压溃;采用中高强度钢材可以有效地提高节点承载力,同时在一定程度上改善抗震性能和延性;楼板配筋率对中高强度钢材节点承载性能和延性耗能影响不大;正对称受力节点具有更好的极限承载力和环线刚度。Four full-size specimens of composite connections are tested under cyclic loading, and the bearing capacity,cyclic performance and failure mode are derived from the experimental results to discuss the effect of the medium-high strength steel on the seismic performance of the composite connections. Taking into consideration of the steel strength,reinforcement ratio of the concrete slab and the loading mode, several indexes such as loading capacity, ultimate rotation, loop stiffness, ductility and energy dissipation are employed to evaluate the seismic performance. It can be concluded that the major failure mode of the connection is the local buckling of the lower beam flange and the crush of compressed concrete. The application of medium-high strength steel can effectively increase the loading capacity, and improve the seismic performance and ductility to a certain extent while the reinforcement ratio has little effect. Symmetric loading can evidently improve the ultimate strength and the loop stiffness of the connection in comparison with asymmetric loading.

关 键 词：中高强度钢材 梁柱组合节点 抗震性能 混凝土楼板 

分 类 号：TU375.4[建筑科学—结构工程]