本文關(guān)鍵詞： 體外預(yù)應(yīng)力 加固設(shè)計(jì) 仿真模擬 加固評(píng)價(jià)　出處：《沈陽(yáng)建筑大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著時(shí)代的發(fā)展,對(duì)橋梁事業(yè)的發(fā)展提出了更高的要求。然而我國(guó)現(xiàn)存的很多舊橋已經(jīng)無(wú)法滿足現(xiàn)有的交通需求,橋梁病害日益突出,嚴(yán)重影響交通運(yùn)輸。對(duì)舊橋進(jìn)行加固維修成為了目前解決此類問(wèn)題的主要方法之一。體外預(yù)應(yīng)力加固法在眾多加固方法中以其簡(jiǎn)單,方便,加固時(shí)不影響交通,有效的提高結(jié)構(gòu)剛度等優(yōu)點(diǎn),近年來(lái)被廣泛的應(yīng)用到橋梁加固之中。本文依托實(shí)踐工程,以變截面連續(xù)梁橋的體外預(yù)應(yīng)力加固技術(shù)為研究對(duì)象。通過(guò)病害成因分析、有限元軟件模擬、施工監(jiān)測(cè)數(shù)據(jù)對(duì)比,對(duì)體外預(yù)應(yīng)力加固技術(shù)進(jìn)行分析與評(píng)價(jià)。本文采用數(shù)值模擬以及理論分析的方法,對(duì)體外預(yù)應(yīng)力加固變截面連續(xù)梁橋的加固機(jī)理、加固設(shè)計(jì)、加固效果評(píng)價(jià)等方面進(jìn)行了細(xì)致的分析和研究。這不僅具有重要的理論意義,還能為以后的體外預(yù)應(yīng)力加固設(shè)計(jì)提供參考。本文研究主要內(nèi)容如下：1)通過(guò)介紹國(guó)內(nèi)外橋梁現(xiàn)狀,論述加固的重要意義以及緊迫性。同時(shí)簡(jiǎn)單介紹了體外預(yù)應(yīng)力加固法在國(guó)內(nèi)外的研究現(xiàn)狀及其優(yōu)缺點(diǎn)。2)對(duì)比分析各種適合橋梁加固方法的特點(diǎn)以及適用范圍,著重介紹了采用體外預(yù)應(yīng)力的加固方法的優(yōu)缺點(diǎn)及其加固機(jī)理。針對(duì)體外預(yù)應(yīng)力的加固技術(shù),分別從體外預(yù)應(yīng)力的加固方法、體系的基本組成、體內(nèi)外預(yù)應(yīng)力的理論計(jì)算異同等方面進(jìn)行理論闡述。3)為避免引起共振的影響,通過(guò)計(jì)算確定合理的體外預(yù)應(yīng)力索的自由長(zhǎng)度范圍,根據(jù)體外預(yù)應(yīng)力結(jié)構(gòu)的布置原則對(duì)體外索的線形布置進(jìn)行優(yōu)化計(jì)算,從這兩方面來(lái)對(duì)體外索的布置形式進(jìn)行優(yōu)化設(shè)計(jì)。4)利用有限元軟件Midas/civil對(duì)國(guó)內(nèi)某大橋體外預(yù)應(yīng)力加固進(jìn)行仿真模擬分析,分別從加固前后的應(yīng)力狀態(tài),位移變化等方面進(jìn)行比較分析。結(jié)果表明：利用體外預(yù)應(yīng)力加固變截面連續(xù)后,橋梁線形得到有利的恢復(fù),主梁壓應(yīng)力儲(chǔ)備明顯,裂縫縮小甚至消失。說(shuō)明體外預(yù)應(yīng)力加固變截面連續(xù)梁應(yīng)用的可行性。5)通過(guò)模擬分析,對(duì)此大橋進(jìn)行體外預(yù)應(yīng)力加固設(shè)計(jì),對(duì)比分析加固前后的監(jiān)測(cè)數(shù)據(jù)。通過(guò)各工況下主梁變形監(jiān)測(cè)點(diǎn)處的撓度理論值與實(shí)測(cè)值的對(duì)比分析,可以得到以下結(jié)論：體外預(yù)應(yīng)力在張拉完畢的各個(gè)工況下?lián)隙鹊脑隽空�。各張拉階段主梁應(yīng)力變化以及撓度變形的實(shí)測(cè)值與Midas計(jì)算分析得出的結(jié)果相近,偏差很小,變化趨勢(shì)一致。說(shuō)明施工效果達(dá)到了設(shè)計(jì)的預(yù)期效果。同時(shí)也驗(yàn)證了采用Midas/civil對(duì)體外預(yù)應(yīng)力加固施工的模擬的合理性。
[Abstract]:With the development of the times, higher requirements have been put forward for the development of bridges. However, many existing old bridges in our country have been unable to meet the existing traffic demand, and the bridge diseases are becoming increasingly prominent. The reinforcement and maintenance of old bridges has become one of the main methods to solve this kind of problems. In many reinforcement methods, the external prestressing reinforcement method is simple, convenient and does not affect the traffic. In recent years, it has been widely used in bridge reinforcement. Based on practical engineering, the external prestressing reinforcement technology of variable section continuous beam bridge is taken as the research object. Finite element software simulation, comparison of construction monitoring data, analysis and evaluation of external prestressing reinforcement technology are carried out. In this paper, the reinforcement mechanism of externally prestressed continuous beam bridge with variable cross-section is analyzed by numerical simulation and theoretical analysis. The design of reinforcement and the evaluation of reinforcement effect are analyzed and studied in detail, which is not only of great theoretical significance, but also of great theoretical significance. The main contents of this paper are as follows: (1) by introducing the current situation of bridges at home and abroad, This paper discusses the importance and urgency of reinforcement. At the same time, it simply introduces the research status and advantages and disadvantages of external prestressing reinforcement method at home and abroad. This paper mainly introduces the advantages and disadvantages of the external prestressing strengthening method and its strengthening mechanism. In view of the external prestressing strengthening technology, the basic composition of the external prestressing reinforcement method and the system are introduced respectively. In order to avoid the influence of resonance, the reasonable free length range of external prestressing cable is determined by calculation. According to the layout principle of external prestressing structure, the linear arrangement of external cable is optimized and calculated. From these two aspects to optimize the external cable layout design. 4) using the finite element software Midas/civil to simulate and analyze the external prestressing reinforcement of a bridge in China, respectively from the stress state before and after reinforcement. The results show that the linear shape of the bridge can be recovered and the compressive stress reserve of the main beam is obvious after the continuous reinforcement of the variable section by external prestressing. The feasibility of using external prestressing to reinforce continuous beams with variable cross-section is illustrated. 5) through simulation analysis, the external prestressing reinforcement design of this bridge is carried out. The monitoring data before and after reinforcement are compared and analyzed. The deflection of the main beam deformation monitoring point is compared with the measured value under various working conditions. The following conclusions can be drawn: the deflection increment of external prestressing is normal under every working condition after tensioning. The measured values of stress change and deflection deformation of the main beam in each tensile stage are close to those obtained by Midas calculation and analysis, and the deviation is very small. The trend of change is consistent, which indicates that the construction effect has reached the expected effect of design. At the same time, it also verifies the reasonableness of using Midas/civil to simulate the external prestressing reinforcement construction.
【學(xué)位授予單位】：沈陽(yáng)建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.72

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