本文關鍵詞：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》2014年碩士論文　論文類型：學位論文

  更多相關文章： 斜拉橋 拉索 腐蝕 地震 易損性

【摘要】：腐蝕問題是影響斜拉橋拉索運營狀態(tài)下性能最重要因素之一。腐蝕會導致拉索截面削減,構件承載力下降,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)實意義。目前的研究中對斜拉橋易損性的研究多針對結構整體和剛性構件,對腐蝕作用影響的拉索的地震易損性問題極少,對腐蝕影響的拉索安全性重視不夠,同時對計算考慮隨機性因素的腐蝕拉索承載力也沒有成熟的方法。 本文針對服役環(huán)境下的拉索腐蝕和地震響應問題,從拉索性能和易損性方面進行了以下研究：通過模擬綜合考慮應力、溫度、腐蝕環(huán)境等隨機性因素的服役環(huán)境下拉索腐蝕環(huán)境參數(shù)的變化規(guī)律,建立拉索腐蝕隨機性環(huán)境參數(shù)模型；綜合考慮應力、溫度、腐蝕環(huán)境以及隨機性因素等對拉索腐蝕作用的影響,結合全壽命設計理論,提出腐蝕拉索截面變化率這一參數(shù),并通過分段描述拉索在腐蝕作用下對拉索構件截面變化的影響,建立了一種將統(tǒng)計方法、加速腐蝕試驗等相結合的方法以獲取服役期內(nèi)的該參數(shù)的全壽命時間關聯(lián)曲線,為拉索壽命的評估和拉索在服役環(huán)境下的性能研究提供了基礎和參考；綜合考慮拉索腐蝕中的鋼絲點蝕和拉索內(nèi)鋼絲徑向非等值腐蝕問題,提出考慮點蝕問題和徑向非等值腐蝕的修正Daniel模型,建立了考慮隨機性因素的腐蝕拉索承載力評估模型,以此建立腐蝕拉索承載能力概率分析方法,并通過地震反應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。 通過腐蝕拉索地震易損性分析方法分析拉索地震易損性,結果表明考慮腐蝕問題的拉索地震易損性與認為拉索保持完好狀態(tài)的地震易損性存在較大差別,在嚴重腐蝕情況下拉索地震損傷問題不可忽略。說明在海洋大氣等腐蝕性強的服役環(huán)境中,大跨度斜拉橋的抗震設計需對腐蝕問題造成的拉索能力削弱問題予以重視。
[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.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.27;U442.55

【參考文獻】

相關期刊論文 前10條

1 劉軍;邢鋒;丁鑄;;環(huán)境參數(shù)對大氣氯離子作用的影響[J];低溫建筑技術;2008年06期

2 {9b6松二;周勝利;;長大斜拉橋的結構特性和抗風穩(wěn)定性[J];國外橋梁;1982年03期

3 陳炳坤,周履;漢堡科爾布蘭德橋斜拉索的更換[J];國外橋梁;1997年03期

4 張菊輝;胡世德;;橋梁地震易損性分析的研究現(xiàn)狀[J];結構工程師;2005年06期

5 柳承茂,劉西拉;基于剛度的構件重要性評估及其與冗余度的關系[J];上海交通大學學報;2005年05期

6 王東升,翟桐,郭明珠;利用Push-over方法評價橋梁的抗震安全性[J];世界地震工程;2000年02期

7 于剛;孫利民;;斷索導致的斜拉橋結構易損性分析[J];同濟大學學報(自然科學版);2010年03期

8 H.Hwang,劉晶波;地震作用下鋼筋混凝土橋梁結構易損性分析[J];土木工程學報;2004年06期

9 龐于濤;袁萬城;黨新志;沈國煜;;考慮材料劣變過程的橋梁地震易損性分析[J];同濟大學學報(自然科學版);2013年03期

10 徐俊;古銳;于振華;;交通荷載對拉索鋼絲疲勞壽命的影響[J];同濟大學學報(自然科學版);2012年06期

，

本文編號：1384194