带翼缘开洞剪力墙抗震性能

    Seismic Performance of Shear Walls With Flanges and Openings

    • 摘要: 为探究翼缘形状、开洞尺寸、轴压比、剪跨比等参数对带翼缘开洞剪力墙抗震性能的影响,通过带翼缘不规则开洞剪力墙拟静力试验,采用ABAQUS软件建立剪力墙精细化有限元模型,并校验模型的准确性.模拟所得的荷载-位移曲线与试验曲线吻合良好,较好地模拟了带翼缘开洞剪力墙破坏的过程.在成功验证模型的基础上,首先通过改变开洞尺寸,考虑有无附加纵筋,分析开洞率对开洞带翼缘剪力墙抗震性能的影响,得到表征开洞率对带翼缘开洞剪力墙极限承载力影响规律的数学表达式;其次通过改变翼缘形状,分析矩形、带翼缘、T形、带端柱、L形开洞剪力墙的抗震性能;最后建立不同轴压比和剪跨比的带翼缘开洞剪力墙模型.分析发现,随轴压比的增大或剪跨比的减小,洞口对剪力墙极限承载力的劣化影响逐渐增大.在低剪跨比且高轴压比的条件下,翼缘对开洞剪力墙极限承载力的强化作用更为明显.

       

      Abstract: The effects of flange shape, openings, axial load ratio, shear span ratio and other parameters on the seismic performance of the shear wall with flanges and openings were investigated in this study. The accuracy of the shear wall detailed finite element model established by the ABAQUS software was verified by the Qian K's pseudo-static tests via the shear walls with openings and flanges. The load-displacement curves obtained from the simulation were in good agreement with tested results, and the processes of the shear walls failure were well simulated. After the verification of the model, the effects of the opening rate on the seismic performance of the shear wall with openings and flanges studied by varying the open rate and considering whether there is additional vertical steel bar or not, mathematical expressions characterizing the effects of the opening rate on the ultimate bearing capacity of the shear wall with openings and flanges were obtained. The seismic performance of rectangular, flanged, T-shaped, end-column and L-shaped shear wall were analyzed by varying the flange shape. The models of the shear wall with different axial load ratios and shear span ratios were established. The research results show that with the increase of the axial load ratio or the decrease of the shear span ratio, the weakening influence of the openings on ultimate bearing capacity of the shear wall increases gradually. Under the condition of low shear span ratio and high axial load ratio, the strengthening effect of the flange on the ultimate bearing capacity of the shear wall with openings is more obvious.

       

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