国标Q235一字形防屈曲支撑耗能性能试验研究

发布时间：2018-02-26 08:51

本文关键词： 防屈曲支撑屈曲抗震性能试验研究恢复力模型　出处：《西安建筑科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：目前国内外的地震区都在普遍使用支撑—框架体系，，是由于这种体系能给框架结构整体提供较大的抗侧移刚度，提高建筑物的抗震性能。在1994年的美国北岭地震以及1995年的日本阪神地震中，大量装有中心普通支撑体系的楼房在地震中倒塌。事后对倒塌的房屋进行检测分析的时发现，大多数是由于支撑过早的发生屈曲从而使得结构承载力下降引发的。为了解决这个问题，专家和学者提出了一种新的支撑，来保证这种支撑在大震的时候可以屈服，从而起到保护整体结构的作用，但是绝对不能发生屈曲，称之为防屈曲支撑。这种体系目前已经在美国和日本被大量的应用到实际工程当中，以优异的抗震性能得到了大家的认可。在国内也有越来越多的科研人员投入到防屈曲支撑的研究领域中来。本次试验采用的是国产Q235热轧钢材设计并制作防屈曲支撑，测试了钢材的力学性能，制作了6个防屈曲支撑试件，研究其分别在3种芯材横截面、2种灌实材料变化下对构件的耗能能力以及抗震性能的影响。通过低周反复荷载加载试验对六个防屈曲支撑试件的抗震性能进行了研究，具体有力—位移滞回曲线、刚度退化过程、骨架曲线、强度退化过程、耗能能力、等效粘滞阻尼比等。试验结果表明，一字形芯材防屈曲支撑的构造合理，所有试件的滞回曲线稳定饱满；芯材特性和灌实材料强度对于该种防屈曲支撑的耗能性能均有显著影响。其次分析了本次构件的稳定性，有整体稳定与内核芯材的稳定，并推导了相关的公式。在试验的基础上得到了防屈曲支撑的恢复力模型，并将测定结果与双线性模型计算出的理论值进行了比较。结果表明,这种新型屈曲约束支撑各项力学指标实测值与理论值符合较好,耗能能力稳定,满足国内外规范的要求，达到了工程应用的标准。
[Abstract]:At present, brace-frame system is widely used in earthquake areas both at home and abroad, because this kind of system can provide greater lateral stiffness to the whole frame structure. To improve the seismic performance of buildings. During the earthquakes of 1994 in the North Ridge, and 1995 in Hanshin, Japan, a large number of buildings with a central support system collapsed in the earthquake. In order to solve this problem, experts and scholars have proposed a new kind of brace to ensure that it can yield in the event of a strong earthquake. It can protect the whole structure, but it must not be buckled, which is called buckling bracing. This kind of system has been widely used in practical projects in the United States and Japan. Because of its excellent seismic performance, more and more researchers are engaged in the research field of buckling bracing. In this experiment, the domestic Q235 hot rolled steel was designed and manufactured to resist buckling. The mechanical properties of the steel were tested, and six specimens of anti-buckling support were made. The effects of three kinds of core materials on the energy dissipation capacity and seismic performance of the members were studied. The seismic behavior of six specimens of buckling braces was studied by low cycle cyclic loading test. The concrete force-displacement hysteretic curve, stiffness degradation process, skeleton curve, strength degradation process, energy dissipation capacity, equivalent viscous damping ratio, etc. The experimental results show that the structure of a zigzag core against buckling braces is reasonable. The hysteretic curve of all specimens is stable and full, and the properties of core material and the strength of compacted material have a significant effect on the energy dissipation performance of this kind of anti-buckling bracing. Secondly, the stability of this component is analyzed, with the stability of the whole component and the stability of the core material. On the basis of experiments, the restoring force model of buckling braces is obtained, and the measured results are compared with the theoretical values calculated by the bilinear model. The results show that, The measured values of the new buckling constraint braces are in good agreement with the theoretical values, the energy dissipation capacity is stable and meets the requirements of the domestic and foreign codes and meets the engineering application standards.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.1;TU317

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