边缘配置高强纵筋的高强再生混凝土剪力墙抗震性能试验研究

Experimental study on seismic performance of high⁃strength recycled concrete shear walls with high⁃strength longitudinal bars in boundary elements

为研究不同剪跨比、不同边缘构造形式对边缘配置高强纵筋的高强再生混凝土剪力墙抗震性能的影响规律,进行了3个C50再生混凝土剪力墙低周往复荷载试验,包括1个现浇高剪力墙、1个现浇中高剪力墙、1个装配式中高剪力墙。分析了各试件的破坏形态、滞回性能、承载力、延性、刚度退化、耗能能力。结果表明:边缘配置高强纵筋的高强再生混凝土剪力墙破坏形态均以弯曲破坏为主,各试件滞回曲线较饱满,耗能能力较好;中高剪力墙的承载力和刚度比高剪力墙明显提高,但延性系数降低;装配式再生混凝土中高剪力墙在达到峰值荷载之前整体性良好,但由于后浇结合面相对薄弱,试件破坏相对较早,承载力下降较快,延性稍差。基于试验结果,建立了边缘配置高强纵筋的高强再生混凝土中高及高剪力墙承载力计算公式,计算结果与试验结果吻合较好。

In order to research the influence of different shear span ratio and different forms of boundary construction on the seismic performance of high⁃strength recycled concrete shear walls with high⁃strength longitudinal bars in boundary elements,the cyclic load tests of three C50 recycled concrete shear walls were carried out,including one cast⁃in⁃place high⁃rise shear wall,one cast⁃in⁃place mid⁃rise shear wall and one prefabricated mid⁃rise shear wall.The failure pattern,hysteresis performance,bearing capacity,ductility,stiffness degradation,energy dissipation capacity of each specimen were analyzed.The results show that the failure pattern of high⁃strength recycled concrete shear walls with high⁃strength longitudinal bars in boundary elements are mainly bending failure,and the hysteretic curves of all specimens were full,and the energy dissipation capacity is good.Compared with high⁃rise shear wall,bearing capacity and stiffness of the mid⁃rise shear wall are significantly increased,but the ductility coefficient is reduced.The prefabricated recycled concrete mid⁃rise shear wall has a good integrity before reaching the peak load,however,due to the relatively weak bond strength of the bonding surface,the specimen failed earlier,the bearing capacity decreased faster and the ductility is slightly poor.Based on the test results,the bearing capacity formula of high⁃strength recycled concrete mid⁃rise and high⁃rise shear walls with high⁃strength longitudinal bars in boundary element was established,and the calculated results are in good agreement with the test results.