Cui Ye, Chen Fei, Li Zheng, Qian Xiaojuan
Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China.
Department of Structural Engineering, Tongji University, Shanghai 200092, China.
Materials (Basel). 2020 Jun 1;13(11):2518. doi: 10.3390/ma13112518.
Due to timber material's environmental benefits and satisfactory structural properties, the studies on providing solutions to the application of timber to mid-rise or even high-rise buildings have been recently increasing. Among them, the steel-timber hybrid shear wall (STHSW) is one of the promising lateral resisting systems. However, the application of the system is limited because of its unsatisfactory earthquake resilience. In this paper, a new system, self-centering (SC)-STHSW, is proposed by introducing post-tensioned (PT) technology into the STHSW system. The cyclic loading test of one full-scale SC-STHSW specimen was conducted. The new system was proved to have both satisfactory self-centering capacity and the sufficient energy dissipation. Within the OpenSees platform, a numerical model was developed and validated by the experiment result. The model was further used in the parametric analysis. The system's self-centering capacity, energy dissipation performance and the ultimate strength were evaluated under multiple parameters. The parameters included the initial PT stress ratio, the relative value of the damper's activation force, the wood shear wall's resistance, the beam section height and the wood shear wall's strength. The lateral wall-to-frame stiffness ratio was also considered. Each parameter's effects on three different performances of the system were analyzed. Based on the analysis results, a design parameter, a self-centering ratio, was proposed. The ratio was suggested to be larger than 0.5 to ensure a favorable self-centering performance in the system. This study provides support to the application of the innovative steel-timber hybrid structural system in practical engineering.
由于木材材料具有环境效益且结构性能令人满意，近年来，关于为木材应用于中高层建筑甚至高层建筑提供解决方案的研究不断增加。其中，钢木混合剪力墙（STHSW）是一种很有前景的抗侧力体系。然而，由于其抗震性能不理想，该体系的应用受到限制。本文通过在STHSW体系中引入后张（PT）技术，提出了一种新型体系——自复位（SC）-STHSW。对一个足尺SC-STHSW试件进行了循环加载试验。结果表明，该新型体系具有令人满意的自复位能力和足够的耗能能力。在OpenSees平台内，建立了一个数值模型，并通过试验结果进行了验证。该模型进一步用于参数分析。在多个参数下评估了该体系的自复位能力、耗能性能和极限强度。这些参数包括初始PT应力比、阻尼器启动力的相对值、木剪力墙的抗力、梁截面高度和木剪力墙的强度。还考虑了侧墙与框架的刚度比。分析了各参数对该体系三种不同性能的影响。基于分析结果，提出了一个设计参数——自复位率。建议该比率大于0.5，以确保体系具有良好的自复位性能。本研究为创新型钢木混合结构体系在实际工程中的应用提供了支持。
