装配式剪力墙预留弯钩钢筋低周反复荷载下搭接长度研究

为研究装配式剪力墙竖向接缝处新型预留弯钩钢筋在地震作用下的搭接性能,基于本课题组已有单调一次加载下的研究成果,利用ANSYS软件采用分离式建模方法,确定低周反复荷载下的粘结滑移本构关系和加载制度,进行不同钢筋直径和混凝土等级下低周反复加载数值计算分析。结果表明,与单调一次加载相比,低周反复荷载下的预留弯钩钢筋搭接长度增加超过30%。不同钢筋直径和混凝土等级下,考虑抗震要求的预留弯钩钢筋的可靠搭接长度都接近0.9labE。

Research on the overlapping length of reserved hook rebar under low cyclic loading

In order to study the lap joint performance of the new reserved hook rebar at the vertical seam of the prefabricated shear wall under the influence of earthquake,the ANSYS discrete model was set up based on the research results of monotonous one-time loading. Under the bond-slip constitutive relationship and loading regime,numerical calculations of low cyclic loading under different steel bar diameter and concrete grades were conducted. The results show that compared with monotonous onetime loading,the overlap hook length of reserved hooks under low cyclic load increases by 30%. Under different steel bar diameters and concrete grades,the reliable overlap length of the reserved hooks is close to 0.9labE considering seismic requirements.