焊接复合箍筋钢筋混凝土短柱抗震性能试验研究

Experimental Study on Seismic Performance of RC Short Column with Welded Stirrups

为研究焊接复合箍筋钢筋混凝土短柱的抗震性能,首先进行了5根配置焊接复合箍筋的钢筋混凝土短柱和3根普通箍筋的钢筋混凝土短柱（作为对比）抗震拟静力试验,并对其破坏形态、滞回曲线、骨架曲线、延性及耗能指标、强度刚度退化、抗剪承载力等进行了对比分析.结果表明,焊接复合箍筋钢筋混凝土短柱与普通箍筋短柱的抗震性能各项指标两者基本一致或稍有提高,其中破坏过程相似,呈现出剪切破坏及部分剪切粘结型破坏形态,各构件滞回曲线表现出明显的＂捏拢＂效应,延性、耗能能力及强度刚度退化速度两者相当,同时均为明显的脆性破坏,但其位移延性均在3.58~5.52之间,表现出较好的延性抗震能力,表明焊接复合箍筋可用于工程实践和推广.

In order to evaluate the seismic performance of reinforced concrete short column specimens with welded stirrups, pseu- do-static tests of five reinforced concrete short column specimens with welded stirrups and three reinforced concrete short column specimens with common stirrups assembled by hands were conducted. During the experiments, the failure patterns, hysteresis curves, the skeleton curves were measured, and the ductility ratios, energy dissipation index, shear bearing capacity, as well as stiffness deg- radation laws were detailed analyzed. From the experiment and analysis results, it could be concluded that seismic performance of reinforced concrete short column specimens with welded stirrups were similar and sometime better than that of reinforced concrete short columns with common assembling stirrups, and both two types reinforced concrete short columns had similar failure patterns, a typical shear failure pattern with ＂ pinching effect＂. Both of two types short columns were same in ductility, energy dissipating ca- pacity, stiffness degradation laws. From the experiment results, the ductility ratios of all the specimens were in the range of 3.58 to 5.32, which showed that all the specimens had enough ductility, and then it could be concluded that the welded stirrups could be used in the reinforced concrete short columns, which could be also as effective as common stirrups assembled by hands.