全钢自复位防屈曲支撑抗震性能研究

发布时间：2018-07-06 18:37

本文选题：自复位防屈曲支撑 + 滞回耗能能力　；参考：《中国矿业大学》2017年硕士论文

【摘要】：防屈曲支撑具有良好的抗震性能,但都是通过自身的强度和刚度来抵抗地震作用,这会导致其屈服后不能自动回到初始位置,产生较大的残余变形。而基于位移的抗震设计是要求主要结构构件在预期地震作用下的位移在一定限值以内,以保证结构的安全或可修复状态。因此研发出一种既能耗散地震能量,又能减小残余变形的自复位防屈曲支撑具有十分重要的现实意义。本文主要针对于所研发的新型全钢自复位防屈曲支撑,通过试验研究和有限元模拟的方法对其性能进行了研究;并总结和提出了新型全钢自复位防屈曲支撑的初步设计方法,给出了算例验证。本文的主要研究内容和结论如下:首先研发了新型全钢自复位防屈曲支撑装置,并进行了低周往复试验研究。根据自复位防屈曲支撑构造组成和工作原理,研发了新型全钢自复位防屈曲支撑装置,且设计、加工、制作了该支撑装置。通过拟静力试验研究该支撑的滞回耗能性能和复位性能。结果表明:该支撑构造形式合理,具有优良的复位能力,但滞回耗能性能稍弱;能很好的解决自复位防屈曲支撑端部构造复杂等问题;全钢自复位防屈曲支撑进行了有限元建模与分析。基于ABAQUS软件分析各个部件的受力状况与工作原理,并将模拟结果与试验结果进行对比,探讨采用数值模拟方法对该支撑工作性能进行分析研究的可行性。结果表明:支撑的各个部件设置合理;有限元模拟结果与试验结果的滞回曲线吻合程度比较好,能量耗散系数和拉压不均匀系数的差值很小,表明可以采用有限元模拟的方法对全钢自复位防屈曲支撑的性能进行分析;研究分析了全钢自复位防屈曲支撑的主要性能影响因素。影响因素包括传力钢板厚度、复位筋面积、初始预应力的大小和复位筋材料。结果表明:必须控制传力钢板的厚度,防止其出现塑性变形;复位筋面积的增大会削弱支撑的耗能性能,而对复位能力影响不大;增大初始预应力,支撑的耗能能力有一定程度的削弱,其复位能力有较大的提高,但在实际工程中复位筋建议设置为低初始预应力,设定原则为“当耗能内芯屈服时,‘复位力’等于耗能内芯的屈服承载力,即可实现自复位功能”;选用形状记忆合金作为复位筋,将会增大支撑耗能能力,而对复位能力影响很小;总结和提出了全钢自复位防屈曲支撑的初步设计方法。结合国内外学者相关的研究,并通过全钢自复位防屈曲支撑的试验研究和有限元模拟,总结和提出了全钢自复位防屈曲支撑的初步设计方法,包含以下几个方面:防屈曲支撑、自复位系统、支撑的承载力和过渡与连接段的设计方法。并给出了设计算例,为全钢自复位防屈曲支撑的设计和应用提供一定的参考。
[Abstract]:Buckling braces have good seismic performance, but all of them resist seismic action through their own strength and stiffness, which will lead to their failure to return to the initial position automatically after yielding, resulting in large residual deformation. The displacement-based seismic design requires the displacement of the main structural members under the expected earthquake to be within a certain limit to ensure the safety or repairable state of the structure. Therefore, it is of great practical significance to develop a self-reset anti-buckling bracing which not only dissipates seismic energy but also reduces residual deformation. In this paper, the performance of a new type of steel self-reset anti-buckling brace is studied by means of experimental research and finite element simulation, and the preliminary design method of the new-type full-steel self-reset anti-buckling bracing is summarized and put forward. A numerical example is given. The main contents and conclusions of this paper are as follows: firstly, a new type of all steel self-reset anti-buckling brace is developed, and the low cycle reciprocating test is carried out. According to the composition and working principle of self-reset anti-buckling bracing, a new self-reset anti-buckling bracing device of all steel was developed, and the device was designed, machined and manufactured. The hysteretic energy dissipation and reset performance of the support were studied by pseudostatic test. The results show that the structure is reasonable and has excellent reset ability, but the hysteretic energy dissipation performance is slightly weak, and it can solve the complex problems of self-reset anti-buckling support end structure and so on. All steel self-reset buckling braces are modeled and analyzed by finite element method. Based on Abaqus software, the mechanical condition and working principle of each component are analyzed, and the simulation results are compared with the experimental results, and the feasibility of using numerical simulation method to analyze and study the working performance of the support is discussed. The results show that the components of the support are reasonably set, the results of finite element simulation are in good agreement with the experimental results, and the difference between the energy dissipation coefficient and the non-uniform coefficient of tension and compression is very small. It is shown that the finite element simulation method can be used to analyze the performance of self-reset anti-buckling braces of all steel, and the main factors affecting the performance of self-reset anti-buckling brace of all steel are analyzed. The influencing factors include the thickness of the steel plate, the area of the steel bar, the size of the initial prestress and the material of the steel bar. The results show that the thickness of the load transfer plate must be controlled to prevent plastic deformation, the increase of the area of the reposition bar will weaken the energy dissipation performance of the braces, but has little effect on the reset ability, and the initial prestress will be increased. The energy dissipation ability of braces is weakened to a certain extent, and its reset ability is greatly improved. However, in practical engineering, it is suggested that the reinforcements should be set as low initial prestress, and the principle is "when the energy dissipation cores yield," The "reset force" is equal to the yield bearing capacity of the inner core of energy dissipation, which can realize the function of self-reset. "using shape memory alloy as the reposition bar will increase the energy dissipation ability of the support, but has little effect on the reset ability. The primary design method of all steel self-reset anti-buckling braces is summarized and put forward. Combined with the research of scholars at home and abroad, and through the experimental research and finite element simulation of all steel self-reset buckling braces, the preliminary design method of full-steel self-reset buckling braces is summarized and put forward, which includes the following aspects: Anti-buckling braces, Self-reset system, bearing capacity of brace and design method of transition and connection section. A design example is given, which provides a reference for the design and application of all steel self-reset buckling braces.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391;TU352.11

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