【摘要】：預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋在使用過程中，不僅要承受車輛、人群、風(fēng)、雪、地震等外力的作用，而且還要受到環(huán)境、有害化學(xué)物質(zhì)的侵蝕，，同時(shí)橋梁所采用材料的自身性能也會(huì)不斷退化，如混凝土碳化、裂縫、鋼筋銹蝕等等，隨著運(yùn)營(yíng)時(shí)間和交通量的增加，不少連續(xù)剛構(gòu)橋出現(xiàn)了不同程度的病害情況，集中體現(xiàn)在腹板斜裂縫、頂?shù)装蹇v向裂縫、底板的橫向裂縫、以及主跨的持續(xù)下?lián)系�，�?dǎo)致許多在役連續(xù)剛構(gòu)橋承載能力不足。 續(xù)剛構(gòu)橋出現(xiàn)該類問題后的安全狀況如何，未出現(xiàn)該類問題的安全狀況又如何，如何進(jìn)行評(píng)估，對(duì)應(yīng)又該采取什么樣的處理措施，是我們必須解決的問題。這就需要我們對(duì)在役預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋，進(jìn)行恰如其分的評(píng)估。 國(guó)內(nèi)外對(duì)橋梁結(jié)構(gòu)的可靠度問題研究相對(duì)較多，而對(duì)橋梁結(jié)構(gòu)的時(shí)變可靠度問題的研究相對(duì)較少。本文針對(duì)預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋的結(jié)構(gòu)特點(diǎn)，在總結(jié)已有研究成果的基礎(chǔ)上，對(duì)承載能力極限狀態(tài)下的時(shí)變可靠度問題進(jìn)行了深入的研究，主要工作內(nèi)容包括以下幾個(gè)方面： ①可靠度基本理論分析研究 著重論述了可靠度理論的基本原理，基本概念，并且介紹了計(jì)算構(gòu)件時(shí)變可靠度的計(jì)算方法，體系時(shí)變可靠度的計(jì)算方法、目標(biāo)可靠度以及評(píng)估的準(zhǔn)則等等. ②連續(xù)剛構(gòu)橋常見病害及其主要影響因素分析 對(duì)連續(xù)剛構(gòu)橋常見的病害進(jìn)行了總結(jié)，并結(jié)合具體的工程實(shí)例進(jìn)行相應(yīng)的分析，接著將影響連續(xù)剛構(gòu)抗力的主要因素進(jìn)行了分析總結(jié)。 ③預(yù)應(yīng)力混凝土梁橋結(jié)構(gòu)承載能力時(shí)變可靠度研究 首先參照規(guī)范對(duì)荷載效應(yīng)的統(tǒng)計(jì)參數(shù)進(jìn)行了總結(jié)分析，其次針對(duì)抗力衰減的問題，對(duì)抗力主要影響因素混凝土強(qiáng)度、預(yù)應(yīng)力筋的時(shí)變模型進(jìn)行了相應(yīng)的分析，尤其是對(duì)預(yù)應(yīng)力筋銹蝕后的剩余截面面積、力學(xué)性能、有效預(yù)應(yīng)力損率進(jìn)行大膽創(chuàng)新、合理假設(shè)，提出了抗力的時(shí)變模型。 ④連續(xù)剛構(gòu)橋主梁抗彎承載力時(shí)變可靠度計(jì)算分析 首先結(jié)合規(guī)范和前面的理論，提出抗力的時(shí)變模型，進(jìn)而參照相應(yīng)的文獻(xiàn)提出了結(jié)構(gòu)失效的標(biāo)志以及如何處理隨機(jī)過程中的變量。 ⑤連續(xù)剛構(gòu)橋承載力時(shí)變可靠度實(shí)例分析 以云南某連續(xù)剛構(gòu)橋?yàn)槔�，利用軟件Midas/civil建立了有限元計(jì)算模型，并根據(jù)時(shí)變可靠度理論分析研究各個(gè)時(shí)變隨機(jī)變量，利用MATLAB采用了JC法和蒙特卡洛方法(Monte Carlo法)的計(jì)算原理，編制了時(shí)變可靠度計(jì)算程序，進(jìn)而計(jì)算出預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋承載能力的時(shí)變可靠度，在此基礎(chǔ)上與目標(biāo)可靠度進(jìn)行對(duì)比，預(yù)測(cè)其剩余壽命。
[Abstract]:During the use of prestressed concrete continuous rigid frame bridges, they not only have to bear the effects of external forces such as vehicles, crowds, wind, snow and earthquakes, but also suffer from the erosion of environment and harmful chemicals. At the same time, the properties of the materials used in the bridges will be degraded continuously, such as concrete carbonization, cracks, steel corrosion and so on. With the increase of operation time and traffic volume, many continuous rigid frame bridges have different degrees of disease. It is mainly reflected in the web slanting crack, the longitudinal crack in the top and bottom plate, the transverse crack in the bottom plate, and the continuous deflection of the main span, which leads to the insufficient bearing capacity of many existing continuous rigid frame bridges. It is necessary to solve the safety condition of the continuous rigid frame bridge after the occurrence of this kind of problem, the safety condition of the non-existent problem, how to evaluate and how to deal with the corresponding measures. This requires us to properly evaluate the existing prestressed concrete continuous rigid frame bridge. There are many researches on the reliability of bridge structure at home and abroad, but less on the time-varying reliability of bridge structure. In this paper, according to the structural characteristics of prestressed concrete continuous rigid frame bridge, on the basis of summarizing the existing research results, the time-varying reliability under the limit state of bearing capacity is studied deeply. The main work includes the following aspects: 1 the basic theory of reliability is analyzed and studied. The basic principle and concept of reliability theory are discussed, and the calculation method of time-varying reliability of components is introduced. The calculation method of system time-varying reliability, target reliability and evaluation criterion, etc. 2 the common diseases of continuous rigid frame bridge and their main influencing factors are summarized, and the corresponding analysis is made on the basis of concrete engineering examples. Then the main factors affecting the resistance of continuous rigid frame are analyzed and summarized. (3) the time-varying reliability of the bearing capacity of prestressed concrete beam bridge is studied. Firstly, the statistical parameters of the load effect are summarized and analyzed with reference to the code. Secondly, the resistance attenuation problem, the main factor affecting the strength of concrete, is the antagonistic force. The time-varying model of prestressing tendons is analyzed, especially the time-varying model of resistance is put forward by the bold innovation of residual section area, mechanical properties and effective prestress loss rate after corrosion of prestressed tendons. (4) calculation and analysis of time-varying reliability of flexural bearing capacity of main girder of continuous rigid frame bridge first of all, a time-varying model of resistance is put forward in combination with the code and the previous theory. Then the structural failure signs and how to deal with the variables in the random process are put forward according to the corresponding literatures. Case study on Time-varying Reliability of continuous Rigid-Frame Bridge; A continuous rigid frame Bridge in Yunnan Province is taken as an example. Finite element calculation model is established by using software Midas/civil, and each time-varying random variable is analyzed and studied according to time-varying reliability theory. Using the calculation principle of JC method and Monte Carlo method (Monte Carlo method) of MATLAB, the time-varying reliability calculation program is compiled, and then the time-varying reliability of prestressed concrete continuous rigid frame bridge is calculated. On this basis, compared with the target reliability, the residual life of the target is predicted.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.23;U441

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