發(fā)布時(shí)間：2018-01-05 18:00

  本文關(guān)鍵詞：腐蝕服役環(huán)境條件下斜拉橋拉索地震易損性　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 斜拉橋 拉索 腐蝕 地震 易損性

【摘要】：腐蝕問(wèn)題是影響斜拉橋拉索運(yùn)營(yíng)狀態(tài)下性能最重要因素之一。腐蝕會(huì)導(dǎo)致拉索截面削減,構(gòu)件承載力下降,是服役環(huán)境下影響拉索承載力產(chǎn)生的主要因素。由腐蝕問(wèn)題引起截面衰減的斜拉橋拉索在地震作用下安全性能大幅降低,因而研究腐蝕拉索地震易損性具有現(xiàn)實(shí)意義。目前的研究中對(duì)斜拉橋易損性的研究多針對(duì)結(jié)構(gòu)整體和剛性構(gòu)件,對(duì)腐蝕作用影響的拉索的地震易損性問(wèn)題極少,對(duì)腐蝕影響的拉索安全性重視不夠,同時(shí)對(duì)計(jì)算考慮隨機(jī)性因素的腐蝕拉索承載力也沒(méi)有成熟的方法。 本文針對(duì)服役環(huán)境下的拉索腐蝕和地震響應(yīng)問(wèn)題,從拉索性能和易損性方面進(jìn)行了以下研究：通過(guò)模擬綜合考慮應(yīng)力、溫度、腐蝕環(huán)境等隨機(jī)性因素的服役環(huán)境下拉索腐蝕環(huán)境參數(shù)的變化規(guī)律,建立拉索腐蝕隨機(jī)性環(huán)境參數(shù)模型；綜合考慮應(yīng)力、溫度、腐蝕環(huán)境以及隨機(jī)性因素等對(duì)拉索腐蝕作用的影響,結(jié)合全壽命設(shè)計(jì)理論,提出腐蝕拉索截面變化率這一參數(shù),并通過(guò)分段描述拉索在腐蝕作用下對(duì)拉索構(gòu)件截面變化的影響,建立了一種將統(tǒng)計(jì)方法、加速腐蝕試驗(yàn)等相結(jié)合的方法以獲取服役期內(nèi)的該參數(shù)的全壽命時(shí)間關(guān)聯(lián)曲線,為拉索壽命的評(píng)估和拉索在服役環(huán)境下的性能研究提供了基礎(chǔ)和參考；綜合考慮拉索腐蝕中的鋼絲點(diǎn)蝕和拉索內(nèi)鋼絲徑向非等值腐蝕問(wèn)題,提出考慮點(diǎn)蝕問(wèn)題和徑向非等值腐蝕的修正Daniel模型,建立了考慮隨機(jī)性因素的腐蝕拉索承載力評(píng)估模型,以此建立腐蝕拉索承載能力概率分析方法,并通過(guò)地震反應(yīng)分析獲取腐蝕拉索在地震作用下的需求值概率分布,建立了基于概率方法獲取拉索地震易損性的分析方法。 通過(guò)腐蝕拉索地震易損性分析方法分析拉索地震易損性,結(jié)果表明考慮腐蝕問(wèn)題的拉索地震易損性與認(rèn)為拉索保持完好狀態(tài)的地震易損性存在較大差別,在嚴(yán)重腐蝕情況下拉索地震損傷問(wèn)題不可忽略。說(shuō)明在海洋大氣等腐蝕性強(qiáng)的服役環(huán)境中,大跨度斜拉橋的抗震設(shè)計(jì)需對(duì)腐蝕問(wèn)題造成的拉索能力削弱問(wèn)題予以重視。
[Abstract]:Corrosion is one of the most important factors affecting the performance of cable in cable-stayed bridge. Corrosion will reduce the section of cable and reduce the bearing capacity of members. It is the main factor that affects the bearing capacity of cable in service environment. The safety performance of cable in cable-stayed bridge which is decayed by section caused by corrosion is greatly reduced under earthquake. Therefore, it is of practical significance to study the seismic vulnerability of corroded cables. At present, most of the researches on the vulnerability of cable-stayed bridges focus on the structure as a whole and rigid members, and the seismic vulnerability of cables affected by corrosion is very little. The safety of cables affected by corrosion is not paid enough attention, and there is no mature method to calculate the bearing capacity of corroded cables considering random factors. In order to solve the problem of cable corrosion and seismic response in service environment, the following researches have been carried out in this paper from the aspects of cable performance and vulnerability: stress and temperature are considered synthetically by simulation. The variation law of corrosion environmental parameters of cable in service environment with random factors, such as corrosion environment, is established, and the model of environmental parameters of cable corrosion is established. Considering the influence of stress, temperature, corrosion environment and random factors on cable corrosion, combined with the whole life design theory, the parameter of corrosion cable cross-section change rate is put forward. A statistical method is established by describing the influence of the cable section on the section change of the cable member under the action of corrosion. The combination of accelerated corrosion test and other methods to obtain the whole life time correlation curve of this parameter during the service period provides the basis and reference for the evaluation of cable life and the study of cable performance in service environment. Considering the pitting of steel wire in cable corrosion and radial non-equivalent corrosion of steel wire in cable, a modified Daniel model considering pitting and radial non-equivalent corrosion is proposed. The evaluation model of corrosion cable bearing capacity considering random factors is established, and the probabilistic analysis method of corrosion cable bearing capacity is established. The probabilistic distribution of the required values of corroded cables under earthquake action is obtained by seismic response analysis, and an analytical method based on probabilistic method for obtaining seismic vulnerability of cables is established. The seismic vulnerability of cables is analyzed by the method of seismic vulnerability analysis of corroded cables. The results show that the seismic vulnerability of cables considering corrosion is quite different from that of cables in intact state. The problem of seismic damage of cable in severe corrosion can not be ignored. It shows that it is in the environment of strong corrosive service such as oceanic atmosphere and so on. The aseismic design of long span cable-stayed bridge needs to pay attention to the problem of cable capacity weakening caused by corrosion problem.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27;U442.55

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