自复位钢木混合剪力墙：抗侧力性能试验研究与自复位机理参数分析

该文提出一种新型自复位钢木混合剪力墙体系，其由自复位钢框架、轻型木剪力墙及滑动摩擦型阻尼器组成。通过往复加载试验研究了自复位钢木混合剪力墙体系的抗侧力性能、破坏模式、剪力在钢框架与木剪力墙中的分配规律以及钢绞线内力变化规律。在此基础上，基于OpenSEES平台建立了自复位钢木混合剪力墙的数值模型，并通过试验数据验证了模型的准确性。利用该数值模型进行体系关键参数分析，研究了不同参数设置下自复位钢木混合剪力墙的自复位性能。分析参数选为阻尼器激发力水平及体系初始预应力水平。结果表明：自复位钢木混合剪力墙体系的滞回曲线呈“旗帜型”，自复位性能良好，大位移下阻尼器锁定可带来体系强度与刚度的二次提升；试验中，阻尼器长圆孔设置较长可有效减轻木剪力墙中损伤。参数分析结果显示，阻尼器激发力水平的提高会降低体系的自复位性能，相同阻尼器激发力水平下，体系初始预应力水平的提高不会持续提高体系的自复位性能；根据参数分析结果，给出了自复位钢木混合剪力墙体系中阻尼器激发力与体系初始预应力水平选取的建议公式。

Self-centering steel-timber hybrid shear wall: experimental reseacrh on the lateral performance and the parametric analysis on the self-centering performance

In this work, a new structure system named the self-centering steel timber hybrid shear wall is developed, and it is composed of a self-centering steel frame, an infill light-frame wood shear wall, and slip-friction dampers. Cyclic loading tests on the shear wall system were conducted, and based on the tests, the lateral resistance, failure modes, the distribution and redistribution of shear force of the the self-centering system and the loss of the post-tensioning force were investigated. Based on the OpenSees platform, a numerical model for the new system was developed and then validated against the experimental results. The model was then used to conduct a parameter analysis. In the analysis, the activation force and the initial post-tensioning force were taken as the key parameters. Experimental results showed that the self-centering steel timber hybrid shear wall possessed sufficient self-centering ability and satisfactory energy dissipation. The hysteretic curve of the shear wall was “flag shape”. Due to the lock-up of dampers under the large displacement, the second increase of strength and stiffness for shear wallmay be realized in the test. According to the parametric analysis results, the increase of the activation force may reduce the self-centering capacity of the system. Under the same activation force level, the increase of the initial post-tensioning force may not provide the continuous increase of the self-centering capacity of the system. Furthermore, a formula, which gives the guidance on the selection of dampers’ activation force and the initial post-tensioning force, was proposed for the convenience of design.