本文選題：簡支轉連續(xù) + 舊橋加固�。� 參考：《大連理工大學》2015年碩士論文

【摘要】：鋼筋混凝土橋梁結構隨著時間發(fā)展會出現(xiàn)老化和損傷,而且加之橋梁結構的使用頻率、承受荷載都隨著經濟和社會的發(fā)展而增加,從而引起橋梁的耐久性降低和承載力不足,這些原因使得我國已經出現(xiàn)了大量的舊橋或危橋。這些已經存在的舊橋或危橋,如若不妥善處理,將會阻礙經濟發(fā)展和甚至威脅人類的生命財產安全。但如果將這些橋梁拆除重建將耗費大量的財力人力,造成很大的浪費并增加社會負擔。于是,橋梁加固越來越成為工程技術人員重視的課題。簡支轉連續(xù)加固舊橋是常用的橋梁上部結構加固方法之一。根據連續(xù)方式的不同,簡支轉連續(xù)加固舊橋又可以分為多種形式,其中簡支轉預應力連續(xù)加固效果最優(yōu)。本文以京哈線某大橋簡支轉預應力連續(xù)加固為例,開展這一體系轉換加固方法的研究,主要包括兩個部分,一是借助橋梁結構分析軟件Dr.Bridge進行模擬計算分析,二是根據荷載試驗結果進行數(shù)據處理分析。具體內容介紹如下：1利用專業(yè)有限元軟件Dr.Bridge對結構加固前后分別進行承載能力驗算,驗算過程中參考《公路橋涵設計通用規(guī)范》(JTG D60—2004)和《公路鋼筋混凝土及預應力混凝土橋涵設計規(guī)范》(JTG D62—2004)。在模型運算結果中一方面驗算其是否滿足規(guī)范要求,另一方面分別提取關鍵截面的恒載和活載效應加以對比分析。結果表明結構加固前不能夠滿足規(guī)范要求,不能保證結構有足夠的可靠度。但在體系轉換加固后能夠完全滿足規(guī)范要求,且結構安全儲備充分。此外,本文還從運算結果中提取結構加固前后關鍵截面的彎矩和剪力設計值進行對比分析,結果發(fā)現(xiàn)結構加固后彎矩設計值減小,剪力設計值增加,這是墩頂采用預應力連續(xù)后結構內力重分配的結果。2該橋加固前后各自做了詳細的荷載試驗。本文對兩次荷載試驗的數(shù)據進行處理和分析,數(shù)據內容主要包括結構恒載撓度、試驗荷載撓度和試驗荷載下的應力應變。試驗結果表明,結構加固后,其剛度和穩(wěn)定性都明顯增加,試驗荷載的撓度效應和應力應變效應都顯著減小,再一次證明了該種加固方式的優(yōu)越性。
[Abstract]:Reinforced concrete bridge structure will appear aging and damage with the development of time. Moreover, the use frequency of bridge structure and bearing load will increase with the development of economy and society, which will lead to the reduction of durability and insufficient bearing capacity of bridge. These reasons have led to the emergence of a large number of old or dangerous bridges. These existing old or dangerous bridges, if not properly handled, will hinder economic development and even threaten the safety of human life and property. But if these bridges are demolished and rebuilt, they will cost a lot of money and manpower, cause great waste and increase the burden of society. As a result, bridge reinforcement has become a more and more important subject for engineers and technicians. It is one of the commonly used methods to strengthen the superstructure of the old bridge. According to the difference of continuous mode, simply supported transfer continuous reinforcement of old bridge can be divided into a variety of forms, among which simply supported transfer prestressed continuous reinforcement effect is the best. In this paper, the study of the system transfer reinforcement method is carried out with the example of continuous prestressed reinforcement of a bridge on the Beijing-Harbin Route, which includes two parts: one is to carry out the simulation calculation and analysis with the help of the bridge structure analysis software Dr.Bridge. Second, the data processing and analysis are carried out according to the load test results. The specific contents are as follows: 1. The special finite element software Dr.Bridge is used to check the bearing capacity of the structure before and after reinforcement. In the course of checking calculation, we refer to the General Design Code for Highway Bridges and culverts (JTG D60-2004) and the Design Code for Highway reinforced concrete and Prestressed concrete Bridges and culverts (JTG D62-2004). In the model operation results, on the one hand, it checks whether it meets the requirements of the specification, on the other hand, it extracts the dead load and live load effect of the key section to compare and analyze respectively. The results show that the structure can not meet the requirements of the code before reinforcement, and can not guarantee the reliability of the structure. But after system conversion and reinforcement, it can completely meet the requirements of the code, and the structural safety reserve is sufficient. In addition, the moment and shear design value of the key section before and after reinforcement are extracted from the calculation results for comparative analysis. The results show that the design value of bending moment decreases and the design value of shear force increases after reinforcement. This is the result of the redistribution of the internal force of the bridge after the prestressed continuous structure is adopted at the top of the pier .2 the bridge is subjected to detailed load tests before and after reinforcement. In this paper, the data of two load tests are processed and analyzed. The data mainly include the deflection of dead load, the deflection of test load and the stress and strain under test load. The experimental results show that the stiffness and stability of the structure are obviously increased, and the deflection effect and stress-strain effect of the test load are significantly reduced after reinforcement, which proves the superiority of this reinforcement method again.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.72

【參考文獻】

相關博士學位論文 前1條

1 王伯昕;簡支轉連續(xù)體系自應力法加固舊橋研究[D];大連理工大學;2008年

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本文編號：2113371