包含可更换耗能钢板的自复位支撑参数分析

    Parametric Study of a Self-centering Brace Utilizing Energy Absorbing Steel Plate Clusters

    • 摘要: 为了提高结构的抗震韧性,减小结构的震后残余变形是一种有效途径.研究了一种包含可更换耗能钢板(energy absorbing steel plate,EASP)的自复位支撑(self-centering brace,SCB),对SCB进行了数值模拟研究,建立有限元模型并进行验证,以此为基础对SCB进行了参数分析,探讨关键参数的改变对SCB滞回性能的影响.结果表明:增大EASP的屈服强度可以提高SCB的承载力,但是增大了残余变形,同时使得SCB在位移较小的情况下难以产生耗能能力;减小钢绞线预应力会导致SCB残余变形增大;缩短钢绞线长度会提高SCB刚度和承载力.为了增强SCB的耗能能力和自复位性能,在实际设计中,建议采用较低屈服强度的EASP,同时在满足SCB变形需求的前提下,对钢绞线施加较大的预应力.

       

      Abstract: Reducing the residual deformation of structures after earthquakes is an effective way to achieving high resilience. In this paper, the self-centering brace (SCB) equipped with several energy absorbing steel plate (EASP) clusters was investigated and a finite element model of SCB was established and verified. A parametric study was carried out to investigate the influence of different parameters on the hysteretic response of the SCB. Results show that the EASP with higher yield strength leads to higher strength of the SCB and lager residual deformation. Besides, the energy dissipation capacity is diminished at small displacement, the residual deformation increases noticeably when the post-tensioned force is low, and the stiffness and strength of SCB increase with shortening steel strands. Low strength steel is recommended for EASPs and sufficient post-tensioned force should be applied to the premise of the displacement demand of SCB for a favorable energy dissipation and self-centering capacity.

       

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