本文選題：金屬消能器 + 低周疲勞�。� 參考：《東南大學(xué)》2015年碩士論文

【摘要】：消能減震技術(shù)已經(jīng)發(fā)展成為結(jié)構(gòu)設(shè)計的重要方法之一,金屬消能器即為其中一種重要的技術(shù)手段,其具有耗能能力穩(wěn)定且經(jīng)濟性出眾的優(yōu)點,已經(jīng)在工程實踐中得到了較為廣泛的應(yīng)用。目前對消能器可靠度的研究較少,而消能器在地震中對于結(jié)構(gòu)性能的影響很大,因此,本文對金屬消能器的可靠度進行了較為全面的研究,主要工作和成果如下：(1)以LY160鋼為例,對金屬材料和金屬消能器進行了一系列的試驗研究。首先通過增量步試驗,研究其應(yīng)變強化效應(yīng),在此基礎(chǔ)上建立合理的時程分析模型：其次,對其進行了高應(yīng)變低周疲勞試驗,得到了LY160鋼的低周疲勞壽命模型,作為消能器可靠度計算的依據(jù)；最后,對鋼材進行了有間歇的低周疲勞試驗和低周反復(fù)試驗,研究了間歇及間歇時機對鋼材高應(yīng)變低周疲勞壽命的影響,同時對消能裝置進行了低周反復(fù)試驗,檢驗間歇對裝置低周疲勞壽命的影響,給出了計算有余震地震動序列作用下金屬消能器疲勞壽命的修正參考。(2)傳統(tǒng)雨流法主要用于航空、機械等領(lǐng)域,多針對高周疲勞,因而沒有考慮金屬材料的應(yīng)變硬化效應(yīng),本文根據(jù)增量步試驗的結(jié)果對雨流法進行了修正,并編寫了相應(yīng)的Matlab程序。以低周疲勞破壞作為失效模式計算金屬消能器的可靠度,首先采用對稱拉丁超立方抽樣方法對人造地震波進行抽樣,將獲得的樣本輸入有限元軟件中進行彈塑性計算,得到消能器的變形時程,采用雨流法對變形時程進行統(tǒng)計分析,最后按Miner線性損傷累積原則計算消能器的損傷,若損傷大于1,則消能器失效,對所有抽樣的地震波計算結(jié)果進行統(tǒng)計,即可得到消能器的失效概率。(3)為了更好地說明本文所提的可靠度計算方法,對一安裝剪切型金屬消能器的六層混凝土框架結(jié)構(gòu)進行了算例分析,地震波采用主余震相連的人工地震波,結(jié)合試驗和理論研究成果計算了金屬消能器的失效概率。
[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.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU352.1

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本文編號：1980998