钢管混凝土叠合边框内藏钢板-钢桁架双肢剪力墙抗震研究

Research on seismic behavior of coupled shear wall with STRC columns and embedded steel plate-concealed steel trusses

在大连国际会议中心核心筒墙体抗震设计中,采用了一种钢管混凝土叠合边框墙肢内藏钢板、连梁内藏钢桁架的组合双肢剪力墙。为研究其抗震性能,进行了1个1/7缩尺的这种新型组合双肢剪力墙模型的低周反复荷载试验,分析了其承载力、延性、刚度及其退化、滞回特性、耗能能力和破坏特征,重点研究了钢管混凝土叠合边框、墙肢内藏钢板、连梁内藏钢桁架之间的共同工作性能。研究表明:内藏钢板-钢桁架可显著提高钢管混凝土叠合边框双肢剪力墙的承载力和延性性能;钢管混凝土叠合边框可充分发挥其承载力高、不易开裂、延性好的优势。文中提出了该新型组合双肢剪力墙的承载力计算模型,计算结果与实测结果符合较好。

A new composite RC coupled shear wall with steel tube-reinforced concrete（STRC） columns,in which the steel plate was embedded in the wall piers and the concealed steel trusses were set in the coupling beam,has been employed in Dalian International Convention Center.One 1/7 scale specimen of this kind of coupled shear wall was tested under low-frequency cyclic loading.The load-carrying capacity,ductility,stiffness,attenuation process of stiffness,hysteretic property,energy dissipation and failure phenomena of the specimen were analyzed.The study focused on the co-work performance among STRC columns,embedded steel plate and concealed steel trusses.The results show that the load-capacity and ductility of RC coupled shear wall with STRC columns could be improved greatly by embedded steel plate and concealed steel trusses.The STRC columns have the advantage of higher load-carrying capacity,not liable to crack and better ductility.The simplified mechanics model of load-carrying capacity has been established.The calculating results and those from the test are in good agreement.