本文關(guān)鍵詞： 連續(xù)剛構(gòu)橋 失效模式 穩(wěn)定系數(shù) 體系可靠度　出處：《長沙理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：近年來預應力混凝土結(jié)構(gòu)剛構(gòu)橋應用廣泛,剛構(gòu)橋施工期結(jié)構(gòu)墩身失穩(wěn)失效概率隨施工步驟而變化,由于剛構(gòu)橋施工期結(jié)構(gòu)失效概率要大于統(tǒng)一標準規(guī)定的服役期失效概率,因此研究連續(xù)剛構(gòu)橋梁施工期體系可靠性具有重要的意義。本文以炎汝高速公路三十三標的黑垅大橋作為現(xiàn)實工程背景,對高墩大跨剛構(gòu)橋施工過程中的最大懸臂階段與成橋階段進行墩身穩(wěn)定性和可靠性研究,本文具體工作如下：(1) 按照我國現(xiàn)行規(guī)范界定的工程結(jié)構(gòu)的承載力極限狀態(tài)與正常使用極限狀態(tài)方程,論述了工程結(jié)構(gòu)可靠度的基礎(chǔ)概念與工程結(jié)構(gòu)系統(tǒng)可靠度的分析方法,通過計算分析的工程結(jié)構(gòu)可靠指標,比對了一次二階矩方法(FOSM)與響應面方法(RSM)的計算精度。(2) 對工程結(jié)構(gòu)系統(tǒng)的失效模式進行了探討,簡要的介紹了結(jié)構(gòu)串聯(lián)系統(tǒng)、結(jié)構(gòu)并聯(lián)系統(tǒng)和結(jié)構(gòu)串-并聯(lián)系統(tǒng)。分析了寬界限方法和窄界限方法的上下界和概率網(wǎng)絡(luò)估算技術(shù)方法等工程結(jié)構(gòu)的可靠性評估方法的優(yōu)缺點。(3) 敘述了工程結(jié)構(gòu)第一類與第二類穩(wěn)定問題的基本理論,提出現(xiàn)實工程結(jié)構(gòu)穩(wěn)定問題大多數(shù)為第二類穩(wěn)定問題,使用大型有限元分析軟件Midas/Civil對黑垅大橋創(chuàng)建最高懸臂階段和成橋階段的空間有限元模型來進行黑垅大橋的穩(wěn)定性分析,同時工況考慮了風荷載效應、掛籃跌落和日照溫差效應等荷載的影響,得出各荷載工況下對橋梁穩(wěn)定性的影響情況。(4) 按照高墩大跨剛構(gòu)橋不同施工過程抗力和荷載的相關(guān)性,創(chuàng)建高墩大跨剛構(gòu)橋基于隨機過程模型在失穩(wěn)失效形式下的功能函數(shù),論述了橋梁結(jié)構(gòu)失效模式的尋找和體系可靠度的計算過程,探討了工程結(jié)構(gòu)抗力、恒載和活載施工過程荷載作用隨機性,由實橋模型的計算分析表明了該方式能夠有效分析連續(xù)剛構(gòu)橋懸臂施工過程墩身可靠性,分析結(jié)果對實際工程結(jié)構(gòu)的可靠性分析有一定的研究參考意義。
[Abstract]:In recent years, prestressed concrete rigid frame bridge has been widely used. The failure probability of pier body of rigid frame bridge in construction period varies with construction steps, because the failure probability of rigid frame bridge during construction period is larger than that of service period failure probability stipulated in uniform standard. Therefore, it is of great significance to study the reliability of continuous rigid frame bridge system during the construction period. In this paper, the Heilong Bridge, which is the subject of 33 Yanru Expressway, is taken as the realistic engineering background. In this paper, the stability and reliability of pier during the construction process of high pier and long span rigid frame bridge are studied, including the maximum cantilever stage and the completion stage. The concrete work of this paper is as follows: (1) according to the limit state equation of carrying capacity and normal use of engineering structure defined in the current code of our country, the basic concept of reliability of engineering structure and the analysis method of reliability of engineering structure system are discussed. The failure modes of engineering structure system are discussed by comparing the calculation accuracy of the first order second moment method (FOSM) with the response surface method (RSM) by calculating and analyzing the reliability index of engineering structure, and the structure series system is introduced briefly. The merits and demerits of the reliability evaluation methods of engineering structures, such as the upper and lower bounds of the wide bound method and the narrow bound method and the probabilistic network estimation technique, are analyzed. The basic theories of the first and second stability problems, It is proposed that the stability problems of practical engineering structures are mostly of the second kind. The stability analysis of the Heilong Bridge is carried out by using the large finite element analysis software Midas/Civil to establish the spatial finite element models of the highest cantilever stage and the completion stage of the Heilong Bridge. At the same time, the effects of wind load, drop of hanging basket and temperature difference of sunlight on the stability of the bridge are considered in the working conditions, and the influence on the stability of the bridge under various load conditions is obtained. The relationship between the resistance and load of the rigid frame bridge with long span with high piers during construction is obtained according to the influence of the load on the stability of the bridge. Based on the stochastic process model, the function function of long-span rigid frame bridge with high piers is established. The search for failure mode of bridge structure and the calculation process of system reliability are discussed, and the resistance of engineering structure is discussed. The randomness of load action during dead load and live load construction shows that this method can effectively analyze the reliability of pier body during cantilever construction of continuous rigid frame bridge by calculation and analysis of real bridge model. The analysis results have certain reference significance for the reliability analysis of practical engineering structures.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.4;U448.23

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本文編號：1523601