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首页> 外文期刊>The Structural Design of Tall and Special Buildings >Seismic behavior of superimposed reinforced concrete shear walls with X-shaped steel plate bracings under different axial load ratios
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Seismic behavior of superimposed reinforced concrete shear walls with X-shaped steel plate bracings under different axial load ratios

机译：不同轴向载荷比下X形钢板支护叠加钢筋混凝土剪力墙的地震行为

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摘要

In order to improve the seismic performance of traditional superimposed reinforced concrete shear walls, a kind of superimposed reinforced concrete shear wall with X-shaped steel plate bracings (labeled as SRCXSW) was proposed in this paper. And seismic behaviors of three 1/2-scale shear walls including two SRCXSWs with different axial load ratios (ALRs) and one cast-in-place reinforced concrete shear wall with X-shaped steel plate bracings (labeled as CRCXSW) were investigated by the quasi-static loading test. Experimental results indicated that SRCXSW and CRCXSW with the same ALR exhibited the similar seismic behaviors, different ALRs applied in SRCXSW greatly affected the seismic behaviors in terms of load-bearing capacity, deformation, lateral stiffness, and energy dissipation capacity and slightly affected the failure mode and cooperative mechanism between the precast and cast-in-place concrete layers. In particular, a high ALR applied on SRCXSW had little effect on the stiffness degradation before yielding, but accelerated the post-yield stiffness degradation. Then, based on the discussion conclusion about the contribution of three mechanisms to the load-bearing capacity varying with aspect ratio, a modified strut-and-tie model for predicting the maximum strength of specimens was proposed, and good predictive ability under different ALRs was verified by experimental and finite element analysis (FEA) results. Besides, FEA based on OpenSees was implemented to further investigate the effect of critical parameters, FEA results showed that ALR and longitudinal reinforcement ratio in boundary element had a significant influence on the load-bearing capacity and deformation capacity of SRCXSW. And a higher volumetric ratio of X-shaped steel plate bracings and longitudinal reinforcement ratio in boundary element led to a greater load-bearing capacity but their contribution decrease with the increase of ALR.
机译：为了提高传统叠加钢筋混凝土剪力墙的地震性能，本文提出了一种具有X形钢板支护的叠加钢筋混凝土剪力墙（标记为SRCXSW）。三个1/2尺度剪力墙的地震行为包括两个具有不同轴向载荷比（ALS）的SRCXSW和一个具有X形钢板支护（标记为CRCXSW）的一种铸造钢筋混凝土剪力墙准静态加载测试。实验结果表明，SRCXSW和CRCXSW具有相同的ALS表现出类似的地震行为，在SRCXSW中应用的不同ALS在承载能力，变形，横向刚度和能量耗散容量方面大大影响了地震行为，略微影响了故障模式和配送混凝土层之间的合作机制。特别地，在SRCXSW上施加的高ALR对屈服前的刚度降解几乎没有影响，但加速了产率后刚度降解。此后，基于讨论关于三种机制与纵横比的承载能力的贡献的结论，提出了一种改进的支柱和扎带模型，用于预测标本的最大强度，不同的ALL下的良好预测能力是通过实验和有限元分析（FEA）结果验证。此外，基于OpenESE的FEA实施以进一步研究临界参数的影响，FEA结果表明边界元件中的ALR和纵向增强比对SRCXSW的承载能力和变形容量产生了显着影响。 X形钢板支撑和边界元件中的纵向增强比的较高体积比导致了更大的承载能力，但随着ALR的增加，它们的贡献降低。

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