一种新型软钢减震榫的设计与试验研究

发布时间：2018-08-25 09:07

【摘要】：针对目前铁路桥梁减隔震支座尺寸大、性能单一和造价高等不足,基于支座功能分离的设计思想,提出一种分离式软钢减震榫。分析该减震榫的构造形式与工作机理,制作2组(6个)不同构造参数的分离式软钢减震榫,进行拟静力往复加载试验,研究其滞回曲线、能量耗散能力、初始刚度及位移延性系数等性能参数,同时对影响其滞回性能和弯曲变形的关键因素进行分析。研究结果表明:分离式软钢减震榫的初始刚度较大,滞回曲线饱满、稳定,等效粘滞阻尼比可达到45%以上,具有十分稳定的耗能性能和良好的延性变形能力,可以同时满足桥梁在正常使用阶段的水平刚度要求和地震作用下的耗能要求;影响滞回性能和弯曲变形的主要因素为套筒的长度、榫身高度、耗能段的横截面直径以及突变截面处的处理方式。
[Abstract]:In view of the large size, single performance and high cost of the isolation bearing of railway bridge, based on the design idea of functional separation of the support, a separate soft steel damping tenon is proposed. The structural form and working mechanism of the tenon are analyzed, two groups (6) of separate soft steel dampers with different structural parameters are made, and quasi static reciprocating loading tests are carried out to study the hysteretic curve and energy dissipation ability. The performance parameters such as initial stiffness and displacement ductility coefficient are analyzed, and the key factors affecting hysteretic performance and bending deformation are also analyzed. The results show that the initial stiffness of split-type mild steel tenon is large, the hysteretic curve is full and stable, the equivalent viscous damping ratio can reach more than 45%, and it has very stable energy dissipation performance and good ductility deformation ability. It can meet the requirements of horizontal stiffness and energy dissipation under seismic action at the same time, and the main factors affecting hysteretic performance and bending deformation are sleeve length, tenon height, The cross section diameter of the energy dissipation section and the treatment of the abrupt section.
【作者单位】：北京交通大学土木建筑工程学院;中铁第一勘察设计院集团有限公司;丰泽工程橡胶科技开发股份有限公司;
【基金】：国家高技术研究发展计划(863计划)基金资助项目(2008AA030707)~~
【分类号】：U442.55

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