用于高墩的软钢剪切消能器节段模型参数分析

Parameter analysis of Segmental Model of Mild Steel Shear Energy Dissipator for Tall Piers

为指导新型组合箱形截面高墩中采用的软钢剪切消能器设计,采用ABAQUS软件建立新型组合箱形截面高墩典型节段的有限元模型,并利用前期试验结果对有限元模型进行验证。在此基础上,通过有限元参数化分析,探讨了软钢板屈服强度、高厚比和高宽比变化对节段模型滞回性能的影响规律。结果表明:软钢板的屈服强度或高厚比基本不会影响节段模型的骨架曲线、刚度退化曲线和耗能曲线,且屈服强度越大或高厚比越小,相应的水平极限承载力、初始刚度和耗能也越大;高宽比对节段模型的滞回性能有显著影响,当高宽比不大于1时,滞回曲线均较为饱满,当高宽比为1.5时,滞回曲线呈现明显的梭形,耗能能力不佳;此外,水平极限承载力、初始刚度和耗能能力均随高宽比的减小而显著增加。

In order to guide the design of mild steel shear energy dissipater used in the new composite box section tall pier,the finite element(FE)model of typical section of the tall pier is built by using ABAQUS software,and the FE model is verified by preliminary test results.On this basis,the effects of design parameters such as yield strength,height thickness ratio and height width ratio of mild steel plate on the hysteretic performance of segment model are discussed by FE parametric analysis method.The results show that:the yield strength or height thickness ratio of mild steel plate basically does not affect the skeleton curve,stiffness degradation curve and energy consumption curve of the segment model,and the greater the yield strength or the smaller the height thickness ratio,the greater the corresponding horizontal ultimate bearing capacity,initial stiffness and energy consumption;The height width ratio has a significant effect on the hysteretic performance of the segmental model:the hysteretic curves are very full as the ratio is not greater than 1,however,the hysteretic curve shows an obvious shuttle shape and its energy dissipation capacity is poor as the ratio is 1.5.Moreover,the horizontal ultimate bearing capacity,initial stiffness and energy dissipation capacity increase significantly with the decrease of the height width ratio.