金属消能器可靠度分析

发布时间：2018-06-05 06:35

本文选题：金属消能器 + 低周疲劳　；参考：《东南大学》2015年硕士论文

【摘要】：消能减震技术已经发展成为结构设计的重要方法之一,金属消能器即为其中一种重要的技术手段,其具有耗能能力稳定且经济性出众的优点,已经在工程实践中得到了较为广泛的应用。目前对消能器可靠度的研究较少,而消能器在地震中对于结构性能的影响很大,因此,本文对金属消能器的可靠度进行了较为全面的研究,主要工作和成果如下：(1)以LY160钢为例,对金属材料和金属消能器进行了一系列的试验研究。首先通过增量步试验,研究其应变强化效应,在此基础上建立合理的时程分析模型：其次,对其进行了高应变低周疲劳试验,得到了LY160钢的低周疲劳寿命模型,作为消能器可靠度计算的依据；最后,对钢材进行了有间歇的低周疲劳试验和低周反复试验,研究了间歇及间歇时机对钢材高应变低周疲劳寿命的影响,同时对消能装置进行了低周反复试验,检验间歇对装置低周疲劳寿命的影响,给出了计算有余震地震动序列作用下金属消能器疲劳寿命的修正参考。(2)传统雨流法主要用于航空、机械等领域,多针对高周疲劳,因而没有考虑金属材料的应变硬化效应,本文根据增量步试验的结果对雨流法进行了修正,并编写了相应的Matlab程序。以低周疲劳破坏作为失效模式计算金属消能器的可靠度,首先采用对称拉丁超立方抽样方法对人造地震波进行抽样,将获得的样本输入有限元软件中进行弹塑性计算,得到消能器的变形时程,采用雨流法对变形时程进行统计分析,最后按Miner线性损伤累积原则计算消能器的损伤,若损伤大于1,则消能器失效,对所有抽样的地震波计算结果进行统计,即可得到消能器的失效概率。(3)为了更好地说明本文所提的可靠度计算方法,对一安装剪切型金属消能器的六层混凝土框架结构进行了算例分析,地震波采用主余震相连的人工地震波,结合试验和理论研究成果计算了金属消能器的失效概率。
[Abstract]:The energy dissipation technology has developed into one of the important methods of structural design. Metal energy dissipation device is one of the important technical means, which has the advantages of stable energy dissipation ability and outstanding economy. It has been widely used in engineering practice. At present, there is little research on the reliability of energy dissipator, and the influence of energy dissipator on structure performance is very great in earthquake. Therefore, the reliability of metal dissipator is studied comprehensively in this paper. The main work and results are as follows: 1) taking LY160 steel as an example, A series of experiments were carried out on metal materials and metal dissipators. Firstly, the strain hardening effect of LY160 steel is studied by incremental step test, and a reasonable time history analysis model is established. Secondly, the low cycle fatigue life model of LY160 steel is obtained by carrying out high strain low cycle fatigue test. As the basis of reliability calculation of energy dissipator, the low cycle fatigue test and low cycle repeated test are carried out on steel, and the effects of intermittent and intermittent time on the fatigue life of steel with high strain and low cycle are studied. At the same time, the low cycle repeated test of the energy dissipation device is carried out to test the effect of intermittent on the low cycle fatigue life of the device, and the modified reference. 2) the traditional rain flow method is mainly used in aeronautical engineering, which is used to calculate the fatigue life of metal dissipator under the action of aftershock ground motion sequence. In mechanical field, the strain hardening effect of metal material is not considered because of high cycle fatigue. The rain flow method is modified according to the results of incremental step test, and the corresponding Matlab program is written. The reliability of metal dissipator is calculated by using low-cycle fatigue failure as failure mode. Firstly, the artificial seismic wave is sampled by symmetric Latin hypercube sampling method, and the obtained sample is input into the finite element software for elastic-plastic calculation. The deformation time history of the energy dissipator is obtained, and the deformation time history is statistically analyzed by the rain flow method. Finally, according to the Miner linear damage accumulation principle, the damage of the energy dissipator is calculated. If the damage is greater than 1, the energy dissipator will fail. In order to better explain the reliability calculation method proposed in this paper, the failure probability of the energy dissipator can be obtained by statistical analysis of the calculated results of all the sampled seismic waves. An example of a six-story concrete frame structure with shear metal dissipator is presented. The failure probability of the metal dissipator is calculated by using the artificial seismic wave connected by the main aftershock and combined with the experimental and theoretical research results.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.1

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