防屈曲支撑在框架结构整体加固中的性能研究和应用

发布时间：2018-05-18 21:05

本文选题：混凝土框架结构加固 + 钢支撑加固　；参考：《河北工程大学》2017年硕士论文

【摘要】：如今建筑行业已进入了新建与加固并重的阶段,结构的加固已成为建筑行业的新方向,而防屈曲支撑加固是一种较新型的结构整体的加固方法。顾名思义,防屈曲支撑可在地震的反复作用下避免受压屈曲,使得支撑可在拉压作用下都达到屈服,进行耗能,进而使得结构在罕遇地震下起到第一抗震防线的作用,保护结构主体。本文通过一实际需加固的框架结构,对普通钢支撑整体加固方案和防屈曲支撑(BRB)加固方案进行分析对比。结果表明在多遇地震的作用下,普通钢支撑加固方案相比BRB加固方案能为结构提供更大的抗侧刚度,但是是以牺牲增加支撑截面来达到的;在设防地震作用下,普通钢支撑加固方案由于部分支撑因屈曲退出工作,其抗震性能相比BRB加固方案显现出不足,但两种加固方案都优于原结构,其满足规范的要求;在罕遇地震的作用下,由于大量钢支撑屈曲退出工作,以结构反应与原结构已十分接近,不满足规范的限值,没有达到加固的目的,即保证结构可在大震作用下不倒。而防屈曲支撑加固方案在罕遇地震下因BRB屈服而充分耗能,使得结构的地震反应明显小于钢支撑加固方案及原结构,且小于规范限值。通过时程分析及静力非线性分析,得到防屈曲在抗震加固方面较普通钢支撑具有明显的优势。
[Abstract]:Nowadays, the construction industry has entered the stage of construction and reinforcement, and the reinforcement of structures has become a new direction in the construction industry, and anti-buckling bracing is a relatively new method of strengthening the whole structure. As the name implies, buckling braces can avoid buckling under repeated earthquake action, so that the braces can yield under the action of tension and compression and consume energy, thus making the structure play the role of the first seismic defense line under rare earthquakes. Protection of the main body of the structure. Through a practical frame structure which needs to be strengthened, this paper analyzes and compares the general steel bracing integral reinforcement scheme and the buckle-resistant bracing BRBs reinforcement scheme. The results show that under the action of frequent earthquakes, the reinforcement scheme of ordinary steel braces can provide greater lateral stiffness of the structure than that of the BRB reinforcement scheme, but it can be achieved at the expense of increasing the bracing section. Due to the buckling out of work, the seismic performance of the common steel bracing reinforcement scheme is less than that of the BRB reinforcement scheme, but both of them are superior to the original structure and meet the requirements of the code. Because a large number of steel braces buckle out of work, the structural response is very close to the original structure, which does not meet the limit value of the code, and does not achieve the purpose of strengthening, that is, to ensure that the structure can not collapse under the action of strong earthquake. However, under rare earthquake, the buckling bracing reinforcement scheme consumes energy fully because of BRB yield, which makes the seismic response of the structure obviously smaller than that of the steel bracing reinforcement scheme and the original structure, and is less than the limit value of the code. Through time-history analysis and static nonlinear analysis, it is concluded that the anti-buckling has obvious advantages over ordinary steel braces in seismic strengthening.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11

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