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Experimental study and parameter analysis on the seismic performance of self-centering hybrid reinforced concrete shear walls

机译：自定心混合钢筋混凝土剪力墙抗震性能试验研究与参数分析

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摘要

To enhance the energy dissipation ability of self-centering shear walls, various types of dampers can be incorporated into the rocking surface of a reinforced concrete (RC) wall, which is called a self-centering hybrid shear wall. This paper focuses on self-centering hybrid RC shear walls, which are self-centering shear walls with partially unbonded mild steels. A cyclic loading test was carried out to study the seismic behavior of this type of shear walls compared with conventional precast RC shear walls. The test results showed that the self-centering hybrid RC shear walls displayed better deformation ability and re-centering ability. A multi-truss element model was used to simulate test results in the OpenSees software. To further study the seismic performance of self centering hybrid RC shear wall, a parameter analysis was performed considering five parameters: wall aspect ratio, initial stress of post-tensioned (PT) tendons, the total area of PT tendons, the total area of mild steels, and yielding tensile strength of mild steels. The results of the parameter analysis showed that the most efficient method for improving the energy dissipation ability of the self-centering hybrid RC shear wall was increasing the area of mild steels. The parameter analysis also revealed that the drift capacity in the yielding state can be improved remarkably with the increase of the wall aspect ratio, as well as that the initial stress of PT tendons should be restricted.
机译：为了增强自定心剪力墙的能量消散能力，可以将各种类型的阻尼器结合到钢筋混凝土（RC）墙的摇摆表面中，这称为自定心混合剪力墙。本文着重于自定心混合RC剪力墙，这是具有部分未粘结低碳钢的自定心剪力墙。进行了循环荷载试验，以研究这种剪力墙与常规预制RC剪力墙的抗震性能。试验结果表明，自定心混合RC剪力墙具有较好的变形能力和再定心能力。在OpenSees软件中，使用了多桁架单元模型来模拟测试结果。为了进一步研究自定心混合RC剪力墙的抗震性能，考虑了五个参数进行了参数分析：壁长宽比，后张（PT）筋的初始应力，PT筋的总面积，轻度总面积钢，以及低碳钢的屈服拉伸强度。参数分析的结果表明，提高自对中混合RC剪力墙的消能能力最有效的方法是增加软钢的面积。参数分析还表明，随着壁长宽比的增加，屈服状态下的漂移能力可以得到显着提高，并且应限制PT筋的初始应力。

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