现浇边缘构件的装配整体式齿槽剪力墙抗震性能试验研究

EXPERIMENTAL STUDY ON SEISMIC BEHAVIOR OF ASSEMBLED SERRATE-EDGES MONOLITHIC SHEAR WALL WITH CAST-IN-PLACE BOUNDARY ELEMENTS

为研究装配整体式齿槽剪力墙的抗震性能及竖向接缝性能,对1片现浇剪力墙和3片齿槽剪力墙进行了拟静力试验,变化参数包括轴压比和剪跨比。试验结果表明:墙体发生弯曲破坏,齿槽剪力墙与现浇剪力墙承载力和刚度基本相当,具有良好的抗震性能,可满足“等同现浇”的性能需求;位移角为1/1000时,齿槽剪力墙竖向接缝保持完好;位移角大于1/500时,竖向接缝两侧墙体发生竖向错动变形。齿槽剪力墙滞回曲线饱满,位移延性系数大于5,具有良好的变形能力;提高轴压比、降低剪跨比,加速了竖向接缝开裂并促进竖缝两侧相对变形的发展;改变轴压比和剪跨比对齿槽剪力墙承载力和变形性能的影响规律与现浇剪力墙相同;较高轴压力作用时,墙体破坏集中于竖向插筋孔区域形成竖向裂缝,墙角压溃区域减小。采用ABAQUS软件进行有限元分析,模拟骨架曲线及破坏形态与试验结果吻合良好;改变轴压比、剪跨比对墙体性能的影响与试验结果一致,增加横向槽孔尺寸、减少横向槽孔内侧尺寸,对墙体力学性能基本无影响。

In order to study the seismic performance and the mechanical behavior of vertical joint of assembled serrate-edges monolithic shear wall,one cast-in-place concrete shear wall and three new type shear walls were conducted by quasi-static tests,whose variable parameters include axial compression ratio and shear span ratio.The results show that:all specimens are flexural failure modes,and the flexural capacity and stiffness of the serrate-edges monolithic shear wall are equivalent to these of cast-in-place concrete shear wall.It can be proved that serrate-edges monolithic shear wall has good seismic performance,which can satisfy the design concept of‘being equivalent to cast-in-place counterparts’.The vertical joints keep intact when the displacement angle is 1/1000,and the sliding deformation of the vertical joints occurred when the displacement angle is greater than 1/500.The hysteretic curve of assembled serrate-edges monolithic shear wall is full,and the displacement ductility coefficient is greater than 5,which can be proved that the new type shear wall has good deformation performance.Increasing the axial compression ratio and reducing the shear span ratio expedite crack propagation of vertical joints and the development trends of relative deformation between each side of the vertical joints.Changing these parameters,the influence law of flexural and deformation capacity of the serrate-edges monolithic shear wall is the same as that of cast-in-place shear wall.Under high axial compression,the failure region is concentrated in the vicinity of dowel hole,forming vertical cracks,and the collapse area is reduced at the toe of the shear wall.The numerical analysis was carried out by ABAQUS.The skeleton curve and failure morphology are in accordance with the test results.The effect of axial compression ratio and shear span ratio on the wall performance is consistent with the test.Increasing the size of the transverse slot and reducing the inner size of the transverse groove have little effect on the mechanical properties of the walls.