高阻尼ECC及CFRP筋混凝土带暗支撑剪力墙抗震性能试验研究

Experimental study on seismic performance of high damping ECC and CFRP bars reinforced concrete shear wall with concealed bracing

文中提出了两种方式来进一步改善钢筋混凝土带钢板暗支撑剪力墙的抗震性能,其一是采用具有高延性和高韧性的高阻尼ECC材料来浇筑墙身,其二是在暗柱区域配置具有高抗拉强度和线弹性力学性能的CFRP筋。为研究这两种方式对剪力墙抗震性能的影响,本文完成了1片高阻尼ECC带钢板暗支撑剪力墙和1片CFRP筋混凝土带钢板暗支撑剪力墙的低周往复加载试验,得到了两片剪力墙的破坏模式、承载力、延性、耗能能力和刚度退化等抗震性能指标。通过与传统钢筋混凝土带钢板暗支撑剪力墙的试验结果进行对比后得出:高阻尼ECC带钢板暗支撑剪力墙的承载力、延性和耗能能力均有较大提高,抗震性能得到显著改善;CFRP筋混凝土带钢板暗支撑剪力墙延性和耗能能力均有小幅度提高,抗震性能有一定程度改善,其自复位性能提高明显。

In this paper,two methods are proposed to further improve the seismic performance of reinforced concrete shear wall with steel plate concealed bracing.In the first method,normal concrete in shear wall was replaced by high damping ECC(Engineered Cementitious Composites)material which has high ductility and high toughness.In the second method,the longitudinal steel bars in boundary zone of shear wall were replaced by the CFRP bars which has high tensile strength and linear elastic mechanical properties.In order to investigate the effectiveness of the two improved methods,the quasi-static cyclic loading tests of one piece of high damping ECC shear wall with steel plate concealed bracing and one piece of CFRP bars reinforcement concrete shear wall with steel plate concealed bracing were carried out.The failure modes,load bearing capacities,ductility coefficients,energy dissipation ability and stiffness degradation of the two tested shear walls were obtained.Compared with the test results of traditional reinforced concrete shear wall with steel plate concealed bracing,the bearing capacity,ductility and energy dissipation capacity of the high damping ECC shear wall with steel plate concealed bracing have been greatly improved.The ductility and energy dissipation capacity of CFRP bars reinforced concrete shear wall with steel plate concealed bracing have been slightly improved,but its self-centering performance has been improved obviously.