两边连接竖放波折钢板墙内嵌墙板抗侧性能及优化设计

LATERAL RESISTANCE AND OPTIMIZED DESIGN OF EMBEDDED PANELS IN FOLDED STEEL PLATE WALLS WITH VERTICAL CONNECTIONS ON BOTH SIDES

该文基于有限元数值方法,对仅与框架梁相连的竖放波折钢板剪力墙中内嵌墙板的抗侧性能进行研究,并提出优化设计方法。通过与试验结果的对比,验证了有限元模型及分析方法的可靠性,接着在单向推覆下揭示了波折墙板的“强墙板”和“弱墙板”两种典型抗侧机理,研究了波折墙板参数对其单向推覆抗侧性能的影响。随着宽度的增加,波折墙板的低效抗剪区占比减小,抗侧效率提高;墙板波折角度和厚度的增大,能改善屈曲后承载性能;在其他参数确定的情况下,给出了最优波长的计算式。针对侧边存在低效抗剪区的问题,在墙板两自由边设置加劲构件,并给出起充分加劲作用的界限约束刚度比。加劲构件的引入显著提升了墙板的极限承载力和屈曲后承载性能,对于小宽高比的情况尤为有效。接着,对墙板进行滞回分析发现,由于往复加载下面外累积残余变形的影响,“弱墙板”的骨架曲线相比单向加载时明显下降;而“强墙板”面外变形始终较小,抗侧承载性能稳定。基于滞回分析的大量变参数算例结果,提出了两边连接竖放波折墙板的优化选型建议,为初步设计提供了重要参考。

This paper deals with the shear resistant behaviour for infill corrugated panels in steel corrugated shear walls connected only to the boundary beams and proposes recommendations for optimal configurations of the infill panels,by using the finite element analyses.The reliability of the finite element model and analysis method is verified by comparing with the previous experimental results.Then two typical lateral resistant mechanisms of'strong plate'and'weak plate'for corrugated panels are revealed under monotonic loading,accompanied by the investigation of the effects of key parameters on lateral resistance.It shows that:with the increase of the panel span the proportion of inefficient shear zone decreases and the lateral resistant capacity is increased;the increment of the sub-panel inclined angle and plate thickness can improve the lateral resistance especially the post-buckling load capacity;the formula of optimal corrugation length is developed as other parameters are determined.To decrease the effect of low efficiency shear zone,stiffening members are arranged on the two free sides of the infill panel,and the critical constraint stiffness ratio is suggested to achieve full restraining effect.Stiffeners significantly improve the ultimate resistance and the post-buckling capacity of the infill panel,especially effectively for panels with a small aspect ratio.The hysteretic analysis of infill panels shows that the skeleton curves of'weak walls'are significantly lower than that under monotonic loading due to the accumulated residual deformation under cyclic loading.In contrast,the out-of-plane deformation of'strong plate'is always small and the lateral resistance is stable.Based on the hysteretic results of extensive numerical analysis,the optimal configuration of infill corrugated panels is recommended,which provides an important reference for the preliminary design.