韧性填充墙框架水平荷载-位移曲线简化分析模型

Simplified analysis model of horizontal load-displacement curves of resilient infilled frame

韧性结构具有良好的抗震性能和自复位效果,为研究填充墙对韧性框架抗震性能的影响,建立了韧性填充墙框架的精细化有限元模型,利用数值模拟结果提出了一种荷载-位移曲线的简化预测方法。结果表明:韧性填充墙框架不会发生脆性破坏,预应力钢筋的初始预应力对韧性填充墙框架的承载力影响显著,改变砂浆和砌块的强度会导致填充墙传力模式的改变,填充墙的撑杆作用沿着对角线方向发展,角钢横向开孔对承载力有较大影响。将韧性填充墙框架的受力分解为韧性纯框架与填充墙,分别计算韧性纯框架和填充墙在弹性、弹塑性和塑性阶段的待定参数,并利用线性插值法分别叠加,得出韧性填充墙框架的简化荷载-位移曲线,与有限元模拟结果吻合良好。

The resilient structure has good seismic performance and self-centering effect.To study the effect of infilled walls on seismic performance of resilient frames,a refined finite element of a resilient infilled wall frame was established in this paper,and a simplified prediction method for the load-displacement curve using numerical simulation results was proposed.The results show that the resilient infilled wall frame will not undergo brittle failure,and the initial prestressing force of the prestressed steel reinforcement has a significant impact on the bearing capacity of the resilient infilled wall frame.Changing the strength of the mortar and masonry blocks would lead to changes in the transmission mode of the infill wall.The supporting rod effect of the infilled wall develops along the diagonal direction,and the lateral opening of the angle steel has a significant impact on the bearing capacity.A simplified analysis model was proposed,which decomposed the stress of a resilient infilled wall frame into a resilient bare frame and a infilled wall.The undetermined parameters of the resilient bare frame and the infilled wall in the elastic,elasto-plastic and plastic stages were calculated separately,and the linear interpolation method was used to stack them separately.The simplified load-displacement curve of the resilient infilled wall frame was obtained,which had good agreement with finite element results.