本文選題：地震動序列　切入點：RC框架結(jié)構(gòu)　出處：《中國地震局工程力學(xué)研究所》2017年博士論文　論文類型：學(xué)位論文

【摘要】：大量地震表明,地震過程中僅發(fā)生單次地震的情況較少,即孤立型地震發(fā)生的概率較低,一般為11%。強震的發(fā)生通常伴隨多次余震,且大部分余震與主震時間間隔較短,受損結(jié)構(gòu)在未進(jìn)行加固的情況下再次遭受地震作用,致使結(jié)構(gòu)發(fā)生更為嚴(yán)重的破壞,甚至倒塌。目前國內(nèi)外抗震規(guī)范的設(shè)計方法僅考慮了單次地震作用,即只考慮主震影響。因此,探討合適的途徑考慮多次地震作用對結(jié)構(gòu)的影響具有重要理論意義和工程價值。本文收集了國內(nèi)外廣泛用于結(jié)構(gòu)地震反應(yīng)分析的地震動記錄,以典型RC框架結(jié)構(gòu)為例,研究了兩次地震作用下結(jié)構(gòu)的抗震分析方法;探討了兩次地震作用時設(shè)計PGA調(diào)整系數(shù)的確定方法;當(dāng)設(shè)防烈度、場地條件以及輸入地震動特征不同時,分析了單次與兩次地震作用下結(jié)構(gòu)損傷狀態(tài)的差別,確定了設(shè)計PGA的調(diào)整系數(shù)。主要內(nèi)容包括以下幾部分:1.選取了損傷指標(biāo)及強度折減系數(shù)模型。從加速度時程、反應(yīng)譜、傅立葉譜及對結(jié)構(gòu)的損傷四個方面分析了兩次地震與單次地震的聯(lián)系和區(qū)別;通過分析不同損傷指標(biāo)的適用情況,確定了損傷指標(biāo);通過對三種強度折減系數(shù)模型的比較,選取了 Vidic模型。2.提出了考慮兩次地震作用的抗震分析方法。以典型結(jié)構(gòu)為例,比較了目前用于單次地震作用結(jié)構(gòu)抗震分析的常用方法。在分析各類方法的優(yōu)點和不足的基礎(chǔ)上,給出了結(jié)合動力時程分析、靜力往復(fù)加載分析與Pushover分析的考慮兩次地震作用的結(jié)構(gòu)抗震分析方法;并以3層典型RC框架為例,驗證了方法的可行性。3.基于損傷相等的原理,提出了考慮兩次地震作用的設(shè)計加速度峰值的調(diào)整系數(shù)的確定方法。通過選取、構(gòu)造序列型地震動,對某3層典型RC框架結(jié)構(gòu)進(jìn)行了 600次單一地震和3600次連續(xù)兩次地震的動力彈塑性時程分析,統(tǒng)計了結(jié)構(gòu)整體損傷指數(shù)特征,定義了整體損傷指數(shù)(DI)的放大系數(shù)和PGA的等效調(diào)整系數(shù)兩個參數(shù),給出了考慮兩次地震作用時的結(jié)構(gòu)設(shè)計加速度峰值的調(diào)整系數(shù)建議值。4.建立了考慮兩次地震作用時DI的放大系數(shù)和PGA的等效調(diào)整系數(shù)的經(jīng)驗公式。對不同典型RC框架結(jié)構(gòu)進(jìn)行了動力彈塑性時程分析,并統(tǒng)計了結(jié)構(gòu)整體損傷指數(shù)特征,得到了放大系數(shù)、等效調(diào)整系數(shù)與結(jié)構(gòu)自振周期之間成正比的結(jié)論。5.研究了設(shè)防烈度、場地條件和輸入地震動對放大系數(shù)和等效調(diào)整系數(shù)的影響。通過研究4層RC框架結(jié)構(gòu)在設(shè)防烈度、場地條件和輸入地震動等因素影響下的動力時程分析,根據(jù)整體損傷指數(shù)統(tǒng)計分析,得到放大系數(shù)和等效調(diào)整系數(shù)與設(shè)防烈度成正比,與輸入地震動場地Vs30均值成反比的結(jié)論,給出了輸入地震動對放大系數(shù)和等效調(diào)整系數(shù)的影響的建議值。
[Abstract]:A large number of earthquakes show that there are few single earthquakes in the process of earthquakes, that is, the probability of isolated earthquakes is relatively low, which is generally 11.The occurrence of strong earthquakes is usually accompanied by multiple aftershocks, and the time between most aftershocks and the main shock is relatively short. The damaged structure is subjected to earthquake action again without reinforcement, which results in more serious damage or even collapse of the structure. At present, the design methods of seismic code at home and abroad only consider the action of single earthquake. Therefore, it is of great theoretical significance and engineering value to explore a suitable way to consider the influence of multiple earthquakes on the structure. In this paper, the records of ground motion which are widely used in structural seismic response analysis at home and abroad are collected. Taking the typical RC frame structure as an example, the seismic analysis method of the structure under two earthquakes is studied, and the method of determining the PGA adjustment coefficient of the design under the action of two earthquakes is discussed, when the intensity of fortification, site conditions and the characteristics of the input ground motion are different, The difference of structural damage state between single earthquake and two earthquakes is analyzed, and the adjustment coefficient of design PGA is determined. The main contents include the following parts: 1. The damage index and strength reduction coefficient model are selected. From the acceleration time history, the response spectrum, The relation and difference between the two earthquakes and the single earthquake are analyzed in four aspects of Fourier spectrum and damage to the structure, the damage index is determined by analyzing the application of different damage indexes, and the comparison of the three models of strength reduction coefficient is made. The Vidic model. 2. A seismic analysis method considering the action of two earthquakes is proposed. Taking typical structures as an example, The methods commonly used in seismic analysis of single seismic structures are compared. On the basis of analyzing the advantages and disadvantages of various methods, the combined dynamic time-history analysis is given. Static reciprocating load analysis and Pushover analysis are applied to seismic analysis of structures considering the effects of two earthquakes, and the feasibility of the method is verified by taking a typical three-story RC frame as an example. 3. Based on the principle of equal damage, A method for determining the adjustment coefficient of the peak value of design acceleration considering the action of two earthquakes is presented. Dynamic elastic-plastic time history analysis of a typical RC frame structure with three layers is carried out for 600 single earthquakes and 3600 successive earthquakes, and the damage index characteristics of the whole structure are calculated. The magnification factor of the whole damage index and the equivalent adjustment coefficient of PGA are defined. The suggested value of adjustment coefficient for the peak acceleration of structural design considering two earthquakes is given. The empirical formulas of the magnification factor of DI and the equivalent adjustment coefficient of PGA when considering the action of two earthquakes are established, and the empirical formulas for different typical RC are established. The dynamic elastic-plastic time history analysis of frame structure is carried out. At the same time, the damage index characteristics of the whole structure are calculated, and the magnification factor, the equivalent adjustment factor and the natural vibration period of the structure are obtained. 5. The fortification intensity is studied. The influence of site condition and input ground motion on magnification factor and equivalent adjustment coefficient is studied. The dynamic time history analysis of four-story RC frame structure under the influence of fortification intensity, site condition and input ground motion is studied. According to the statistical analysis of the whole damage index, it is concluded that the magnification factor and the equivalent adjustment coefficient are directly proportional to the fortification intensity and inversely proportional to the Vs30 mean value of the input ground motion. The effect of input ground motion on magnification factor and equivalent adjustment factor is given.
【學(xué)位授予單位】：中國地震局工程力學(xué)研究所
【學(xué)位級別】：博士
【學(xué)位授予年份】：2017
【分類號】：TU375.4

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