腹板式防屈曲支撑结构的试验及理论研究

发布时间：2018-05-25 03:19

本文选题：防屈曲支撑 + 拟静力试验　；参考：《大连理工大学》2015年博士论文

【摘要】：框架-支撑结构体系具有良好的抗侧刚度。传统中心支撑由稳定性控制,需严格控制其长细比。而防屈曲支撑兼具中心支撑和位移型阻尼器的功能,具有更饱满的滞回曲线,无强度及刚度退化现象,拉压恢复力特性相近,耗能能力较强。本文在已有防屈曲支撑框架结构研究的基础上,对以下几个方面展开了研究工作：(1)对由平板截面焊接组合而成且芯板为低屈服点钢的腹板式防屈曲支撑进行拟静力往复加载试验以研究其耗能机理,并通过数值模拟对其滞回行为进行了验证。试验和数值结果表明,所设计的防屈曲支撑具有良好的滞回耗能能力。(2)对分别装有上述腹板式防屈曲支撑和普通支撑的框架结构进行振动台试验,比较了这两种支撑的减震效果,并对该试验过程进行了数值模拟。试验及数值结果表明,腹板式防屈曲支撑对结构的位移反应有更好的控制效果,是一种理想的消能减震装置。(3)基于现有地震损伤模型及其量化标准,研究并提出了基于地震损伤的防屈曲支撑框架结构抗震设计方法；该方法采用刚度比单参数损伤模型描述框架结构的刚度退化情况,结合改进的能力谱法进行损伤评估以确定腹板式防屈曲支撑的设计参数；所提抗震设计方法的实用性和有效性通过某一工程实例得以验证。(4)基于遗传算法基本理论,对防屈曲支撑在框架结构中的位置优化进行了研究,提出了以地震损伤为位置优化标准,并提出了相应的优化目标函数；将所提方法应用于实际工程中,证明了其能够最优的实现防屈曲支撑对结构的控制效果。(5)考虑钢筋锈蚀及地震损伤对既有建筑结构抗震性能的影响,以地震损伤指数为抗震性能目标,提出了基于腹板式防屈曲支撑的既有建筑结构加固分析方法；给出了加固分析及设计流程；以一工程实例验证了所提加固分析方法的实用性及有效性。(6)将上述腹板式防屈曲支撑应用到某钢框架结构中,以加强该结构中的薄弱环节,为防屈曲支撑结构的设计提供参考。数值结果表明,本文的腹板式防屈曲支撑对该结构在地震作用下的结构响应具有较好的控制作用,薄弱层得到了明显加强。
[Abstract]:The frame-braced structure system has good lateral stiffness. The traditional central support is controlled by stability, and its aspect ratio should be strictly controlled. The anti-buckling braces have the functions of both central bracing and displacement-type dampers. They have more full hysteretic curves, no degradation of strength and stiffness, similar characteristics of tension and compression restoring forces, and strong energy dissipation ability. In this paper, based on the existing research on buckling braced frame structure, In this paper, the following research work has been carried out: 1) Quasi-static reciprocating loading tests on the web plate buckling braces made of welded flat plate steel with core plate as low yield point steel are carried out to study the mechanism of energy dissipation. The hysteretic behavior is verified by numerical simulation. The experimental and numerical results show that the designed anti-buckling braces have good hysteretic energy dissipation capability. The shock absorption effects of the two kinds of braces are compared, and the experimental process is numerically simulated. The experimental and numerical results show that the web plate anti-buckling bracing has better control effect on the displacement response of the structure and is an ideal energy dissipation device based on the existing earthquake damage model and its quantitative standard. The seismic design method of buckling braced frame structure based on earthquake damage is studied and proposed, and the stiffness degradation of frame structure is described by using the stiffness ratio of single parameter damage model. Combined with the improved capability spectrum method to evaluate the damage to determine the design parameters of the web plate buckling braces, the practicability and effectiveness of the proposed seismic design method can be verified by an engineering example) based on the basic theory of genetic algorithm. In this paper, the position optimization of buckle-resistant braces in frame structures is studied, and the optimum standard of seismic damage is put forward, and the corresponding optimization objective function is put forward, and the proposed method is applied to practical engineering. It is proved that it can best realize the control effect of buckling bracing on the structure. (5) considering the influence of steel bar corrosion and earthquake damage on the seismic performance of existing building structures, the seismic damage index is taken as the seismic performance target. The reinforcement analysis method of the existing building structure based on the web plate buckling bracing is put forward, and the reinforcement analysis and design flow chart are given. An engineering example is given to verify the practicability and effectiveness of the proposed reinforcement analysis method. The above web plate buckling braces are applied to a steel frame structure to strengthen the weak links in the structure and to provide a reference for the design of the buckling bracing structure. The numerical results show that the web plate buckling bracing in this paper has a good control effect on the structural response of the structure under earthquake, and the weak layer is obviously strengthened.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU352.11

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