【摘要】：地震災(zāi)害的巨大經(jīng)濟(jì)損失促使人們對基于承載力的抗震設(shè)計(jì)方法進(jìn)行反思,1995年美國學(xué)者首次提出基于性能的抗震設(shè)計(jì)思想,受到國內(nèi)外學(xué)者的廣泛關(guān)注。Pushover分析作為一種進(jìn)行結(jié)構(gòu)地震非線性分析的簡化方法,在一定條件下可以較為準(zhǔn)確、簡便地評估結(jié)構(gòu)的性能水平,在建筑結(jié)構(gòu)抗震分析和設(shè)計(jì)中得到了廣泛應(yīng)用。但是傳統(tǒng)的Pushover分析,通常采用的是一個(gè)單向的加載過程,逐級加載以達(dá)到結(jié)構(gòu)破壞的目標(biāo)值。但在實(shí)際的地震作用下的結(jié)構(gòu)所受的是往復(fù)受力過程,顯然單向的加載模式不能夠準(zhǔn)確的反應(yīng)地震作用下結(jié)構(gòu)和構(gòu)件的真實(shí)受力特性,而且不同的水平側(cè)向力加載模式對分析結(jié)果有較大差異。通過考慮傳統(tǒng)的Pushover分析在單向加載和水平側(cè)向力分布模式的不足,本文提出了基于變形能耗散歷程往復(fù)推覆分析方法下的水平側(cè)向力分布模式,這種水平側(cè)向力分布模式在結(jié)構(gòu)性能設(shè)計(jì)當(dāng)中獲得了良好的效果。通過對結(jié)構(gòu)能量輸入歷程特征的描述以及建立結(jié)構(gòu)變形能耗散歷程的簡化模型,獲取對結(jié)構(gòu)進(jìn)行往復(fù)推覆分析的歷程控制參數(shù),從而在實(shí)現(xiàn)最大變形與累積耗能雙控的同時(shí),考慮耗能歷程對結(jié)構(gòu)損傷的影響。這里主要對結(jié)構(gòu)進(jìn)行均布分布、倒三角分布、拋物線分布和隨振型而變的自適應(yīng)分布四種側(cè)向力加載模式下往復(fù)推覆分析,并與單向推覆分析和動(dòng)力時(shí)程分析結(jié)構(gòu)對比。分析表明：隨振型而變的自適應(yīng)分布模式往復(fù)推覆分析方法能夠較為準(zhǔn)確的估計(jì)結(jié)構(gòu)在地震作用下的出鉸模式、最大層間位移、累積滯回耗能及滯回耗能的分布；不同側(cè)向力加載模式下往復(fù)推覆分析的可行性以及為Pushover分析中側(cè)向力加載模式的選擇提供參考；通過了解結(jié)構(gòu)構(gòu)件破壞機(jī)制、結(jié)構(gòu)局部與整體損傷的關(guān)系,從而進(jìn)一步為新結(jié)構(gòu)的設(shè)計(jì)或受損結(jié)構(gòu)的加固提供有針對性的指導(dǎo)。
[Abstract]:The huge economic loss caused by earthquake disaster has prompted people to rethink the method of seismic design based on bearing capacity. In 1995, American scholars first put forward the idea of performance-based seismic design. Pushover analysis, as a simplified method for nonlinear analysis of structures, can be used to evaluate the performance of structures accurately and easily under certain conditions. It is widely used in seismic analysis and design of building structures. However, the traditional Pushover analysis usually uses a one-way loading process, loading step by step to achieve the target value of structural damage. But under the actual earthquake action, the structure is subjected to reciprocating force process, obviously the unidirectional loading mode can not accurately reflect the true stress characteristics of the structure and members under earthquake action. Moreover, different lateral load modes have great difference on the analysis results. Considering the shortcomings of the traditional Pushover analysis in unidirectional loading and horizontal lateral force distribution, a horizontal lateral force distribution model based on the displacement energy dissipation and reciprocating push-over analysis method is proposed in this paper. This horizontal lateral force distribution mode has achieved good results in structural performance design. By describing the characteristics of the energy input history of the structure and establishing a simplified model of the energy dissipation history of the structure deformation, the parameters of the history control for the reciprocating and pushing analysis of the structure are obtained, so as to realize the dual control of the maximum deformation and the cumulative energy consumption at the same time. The influence of energy dissipation history on structural damage is considered. In this paper, four kinds of lateral force loading modes, namely uniform distribution, inverted triangle distribution, parabola distribution and adaptive distribution with vibration mode, are analyzed, and compared with unidirectional push-over analysis and dynamic time-history analysis. The results show that the adaptive distribution mode of reciprocating and push-over analysis can accurately estimate the distribution of hinge mode, maximum interlayer displacement, cumulative hysteretic energy dissipation and hysteretic energy dissipation of the structure under earthquake action. The feasibility of reciprocating and pushing analysis under different lateral force loading modes and the selection of lateral force loading modes in Pushover analysis are provided. Through the understanding of the failure mechanism of structural members and the relationship between the local structure and the whole damage, further guidance is provided for the design of new structures or the reinforcement of damaged structures.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375.4
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本文編號：2406992