密柱-钢板深梁结构抗震性能试验研究

Experimental study on seismic behavior of structure with dense columns-deep steel plate beams

提出了一种内藏密柱-钢板深梁混凝土组合剪力墙,密柱-钢板深梁为其核心钢构.为研发高性能密柱-钢板深梁结构,对4个具有不同设计参数的试件进行了低周反复荷载试验.试件的密柱分为方钢管混凝土、圆钢管混凝土、工字钢3种截面,钢板深梁分为Q235,Q345两种钢材,试件剪跨比为1.5.基于试验,分析了各试件的承载力、刚度及退化过程、延性、滞回特性、耗能、损伤与破坏过程,提出了密柱-钢板深梁结构承载力计算模型,计算结果与实测结果符合较好.研究结果表明:"强密柱、弱钢板深梁"型结构可实现延性屈服机制;密柱截面用钢量相同时,采用圆钢管混凝土密柱的结构性能最好;与采用Q345钢板深梁的结构相比,采用Q235钢板深梁的结构虽承载力略小但延性更好;密柱-钢板深梁结构具有良好的抗震性能和延性屈服机制.

The composite concrete shear wall embedded with dense columns-deep steel plate beams as the core structure was proposed. In order to investigate a high-performance structure with dense columns-deep steel plate beams,lowcyclic loading experiments were carried out on four specimens with different design parameters. Three section styles,including concrete filled square steel tube column,concrete filled circular steel tube column,and I-section steel column,were adopted for dense columns. The steel strengths of deep beams included two grades,Q235 and Q345. The shear span ratios of all the specimens were 1. 5. Based on the experiments,the load-bearing capacities,stiffness and deterioration processes,ductilities,hysteretic behaviors,energy dissipations,damage and failure processes of specimens were analyzed. The load-bearing capacity calculation model was established,and the calculation results were in good agreement with the test results. The investigation results showthat the structure with ＂strong columns and weak deep steel plate beams＂can achieve the ductile yield mechanism. Among three types of dense columns with the same steel consumption,the structure with circular steel tube columns has the best seismic performance. Compared with the structure of Q345,the structure with steel deep beams of Q235 has better ductility in spite of lower loadbearing capacity. The structure with dense columns-deep steel plate beams has good seismic performance and shows good ductile yield mechanism.