低屈服点钢阻尼器的试验研究简介.docx

低屈服点钢剪切板阻尼器滞回性能和疲劳性能试验研究 李冀龙1,2,3，刘轩铭2，马进2 （1 结构工程灾变与控制教育部重点实验室，哈尔滨工业大学，黑龙江，哈尔滨，1500902 哈尔滨工业大学土木工程学院，黑龙江，哈尔滨，1500903 Department of Civil and Environmental Engineering, University of California, Berkeley, CA, the US, 94710） 摘要：设计、制作了一种用于结构振动控制的低屈服点钢剪切板阻尼器，该阻尼器通过核心耗能板的剪切变形来耗散结构振动产生的能量。首先，采用渐增循环加载和随机循环加载探究该阻尼器在变幅循环下的滞回性能；然后，采用等幅循环加载，以高厚比为变量，结合前人试验，考察阻尼器的低周疲劳性能。研究结果表明：该类型阻尼器具有饱满的滞回曲线，等效黏滞阻尼系数可达到50%，具有优异的滞回性能；不同高厚比的阻尼器延性系数均大于70，表明该类型剪切板阻尼器具有良好的延性性能；等幅循环加载条件下阻尼器的破坏模式影响其耗能性能和疲劳性能，应避免不利的破坏模式。 关键词：结构振动控制；低屈服点钢；剪切板阻尼器；低周疲劳； 滞回性能；耗能减震 中图分类号：TU352.1 文献标志码：A RESEARCH ON HYSTERETIC BEHAVIOR AND FATIGUE PROPERTY OF SHEAR PANELS DAMPERS MADE OF LOW-YIELD STEEL Abstract:A kind of shear panels dampers made of low-yield steel used for structural vibration control was designed and manufactured. The dampers dissipate energy which produced by structural vibtation by means of shear deformation of the core energy dissipation plate. First, increasing cyclic loading and random cyclic loading were adopted to investigate the hysteretic behavior of the dampers under alterant amplitude loading. Then, equivalent cyclic loading was adopted to investigate the dampers’ low cycle fatigue property combined with previous studies. Ratio of height to thickness is variable. The study indicates that the damper has excellent hysteretic behavior with full hysteresis curve and the equivalent viscous damper factor can achieve 50%; ductility factors of the damper with different ratio of height to thickness are all greater than 70, which indicates that this type of damper has good ductility behavior; failure mode of the damper under equivalent cyclic loading influences dissipation capacity and fatigue property, so adverse failure mode should be avoided. 0引言 被动耗能减震[1]是土木工程领域结构振动控制的主要方向之一，它是在主体结构中设置非结构构件的耗能器或阻尼器，结构振动时这些耗能器或阻尼器被动地往复相对运动，继而耗散结构振动产生的能量、减轻结构的动力反应。被动耗能减震以其构造简单、制作方便、造价低廉、易于更换、适用范围广等优点，受到各国学者的高度重视，国内外被动耗能减震结构已建成了数百座，在一定程度上经受住了地震的考验。 耗能器或阻尼器通常分为三类[2]：位移相关型、速度相关型和协调吸振型。传统的金属阻尼器通常通过延性或超弹性性能较好的金属元件的弹塑性滞