本文選題：RC梁橋 + 車輛超載��； 參考：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：鋼筋混凝土梁橋是公路、鐵路橋梁中常見的結(jié)構(gòu)之一,其以構(gòu)造簡(jiǎn)單、制作方便、造價(jià)經(jīng)濟(jì)等優(yōu)點(diǎn),在中小跨徑公路橋梁中得到了廣泛的應(yīng)用。在我國(guó),由于設(shè)計(jì)標(biāo)準(zhǔn)的相對(duì)滯后以及追求經(jīng)濟(jì)效益的最大化導(dǎo)致公路橋梁車輛超載現(xiàn)象客觀存在。工程實(shí)踐表明：盡管一次偶然超載不一定對(duì)橋梁造成明顯結(jié)構(gòu)損傷,但是反復(fù)的超載作用將式結(jié)構(gòu)的疲勞損傷加劇,增大失效風(fēng)險(xiǎn),減短使用壽命,提高維修成本。因此,研究超載運(yùn)營(yíng)下橋梁疲勞損傷規(guī)律并進(jìn)行安全評(píng)估有重要現(xiàn)實(shí)意義。本文首先對(duì)結(jié)構(gòu)可靠度的基本概念、常用計(jì)算方法、疲勞問(wèn)題的分析方法以及三種疲勞可靠度分析模型進(jìn)行了簡(jiǎn)要的闡述,為后續(xù)分析計(jì)算車輛超載對(duì)鋼筋混凝土橋梁疲勞可靠性的影響工作提供了理論基礎(chǔ)。然后從規(guī)范方法角度入手,分析了車輛超載與疲勞可靠性、疲勞壽命的關(guān)系；并以傳統(tǒng)的用于疲勞可靠性分析的累積損傷模型和英國(guó)BS5400規(guī)范中標(biāo)準(zhǔn)疲勞車為基礎(chǔ),以一典型20m跨鋼筋混凝土簡(jiǎn)支T梁橋?yàn)楸尘?研究了車輛超載對(duì)鋼筋混凝土梁橋的疲勞可靠度的影響和車輛超載與交通量增長(zhǎng)同時(shí)作用下該鋼筋混凝土梁橋的疲勞可靠度的時(shí)變規(guī)律及其對(duì)疲勞壽命的影響。研究表明：在相同的使用壽命情況下,超載水平越高,細(xì)節(jié)的疲勞可靠度指標(biāo)越低,發(fā)生疲勞失效的概率相應(yīng)也越大；同時(shí)考慮超載與交通量增長(zhǎng)將大大縮短橋梁的疲勞壽命,與只考慮超載情況相比,服役后期細(xì)節(jié)的疲勞可靠度指標(biāo)將急劇減小,橋梁在設(shè)計(jì)基準(zhǔn)期內(nèi)發(fā)生疲勞破壞的風(fēng)險(xiǎn)將顯著增加,疲勞壽命大大降低。
[Abstract]:Reinforced concrete beam bridge is one of the most common structures in highway and railway bridges. It is widely used in medium and small span highway bridges because of its advantages of simple structure, convenient manufacture and economical cost. In China, the phenomenon of overloading of highway and bridge vehicles exists objectively due to the lag of design standards and the maximization of economic benefits. The engineering practice shows that although a accidental overload does not necessarily cause obvious structural damage to the bridge, repeated overload will aggravate the fatigue damage of the formula structure, increase the risk of failure, reduce the service life and increase the maintenance cost. Therefore, it is of great practical significance to study the fatigue damage law and safety assessment of bridges under overload operation. In this paper, the basic concepts of structural reliability, common calculation methods, fatigue analysis methods and three kinds of fatigue reliability analysis models are briefly described in this paper. It provides a theoretical basis for the subsequent analysis and calculation of the influence of vehicle overload on the fatigue reliability of reinforced concrete bridges. Then, the relationship between vehicle overload and fatigue reliability and fatigue life is analyzed from the point of view of specification method, and based on the traditional cumulative damage model for fatigue reliability analysis and the standard fatigue vehicle in British BS5400 Code. Taking a typical 20m span reinforced concrete simply supported T-beam bridge as the background, The influence of vehicle overload on the fatigue reliability of reinforced concrete beam bridge is studied. The time-varying law of fatigue reliability and its influence on fatigue life of the reinforced concrete beam bridge under the simultaneous action of vehicle overload and traffic volume are studied. The results show that under the same service life, the higher the overload level, the lower the fatigue reliability index of detail, and the higher the probability of fatigue failure is. Compared with only considering the overload, the fatigue reliability index of the later service details will be reduced sharply, the risk of fatigue failure of the bridge in the design reference period will be increased significantly, and the fatigue life will be greatly reduced.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 宗雪梅;胡大琳;高軍;;橋梁超重荷載與限載標(biāo)準(zhǔn)的確定[J];長(zhǎng)安大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年01期

相關(guān)碩士學(xué)位論文 前2條

1 傅珍;超載運(yùn)輸對(duì)路面結(jié)構(gòu)的損傷研究[D];長(zhǎng)安大學(xué);2004年

2 趙亞敏;超載運(yùn)輸對(duì)鋼筋混凝土橋梁疲勞性能的影響研究[D];中南大學(xué);2007年

，

本文編號(hào)：2080438