本文選題：鋼筋混凝土橋梁　切入點：損傷　出處：《太原理工大學(xué)》2014年碩士論文

【摘要】：橋梁受外界荷載等因素影響,在使用過程中會受到不同程度的損傷,其承載力和結(jié)構(gòu)功能均會下降。加之近年來,交通量飛速增長,車輛重型化日趨嚴重,很多既有橋梁已經(jīng)無法滿足其使用要求,有些甚至面臨坍塌的危險。因此,損傷橋梁的加固及加固效果的檢測顯得尤其重要,對橋梁的安全運營具有重要意義。 本文對某既有鋼筋混凝土損傷橋梁的加固進行了系統(tǒng)研究。首先對其損傷情況進行檢查,根據(jù)檢查結(jié)果和損傷評定確定加固方案,實施加固措施；然后對加固后的橋梁進行荷載試驗包括承載能力和動力性能兩方面的檢測,確定加固方案的有效性。主要開展了如下工作： 1、歸納總結(jié)損傷類型和加固方法。歸納鋼筋混凝土橋梁的損傷類型,并分析損傷機理和影響因素以及對橋梁結(jié)構(gòu)的影響；總結(jié)鋼筋混凝土橋梁的一般加固方法,闡述各個加固方法的優(yōu)缺點和適用情況。 2、對該鋼筋混凝土橋梁進行損傷檢查。該鋼筋混凝土橋梁為四孔一聯(lián)的鋼筋混凝土連續(xù)橋,通過對該橋進行上部結(jié)構(gòu)、下部結(jié)構(gòu)和路基邊坡的整體外觀檢查,采用規(guī)范規(guī)定的評定標準對橋梁進行綜合評定。以評定結(jié)論和專家意見設(shè)計加固標準,并確定加固方案,根據(jù)計算標準,通過理論計算初步驗證加固方案的可行性。 3、對加固后的鋼筋混凝土橋梁進行承載能力和工作性能評定。本文首先利用MIDAS/CIVIL軟件建立初始模型進行內(nèi)力計算,確定靜載試驗的測試截面；其次選取最不利工況對橋梁進行荷載實驗,并通過有限元進行靜載模擬,通過比較靜載實測值和模擬值,對加固后橋梁的承載能力和工作性能進行評定,確定加固效果顯著。 4、對加固后的鋼筋混凝土橋梁進行動力分析。通過對該加固后橋梁進行動載試驗(包括跑車和剎車的激振試驗),測試橋梁的結(jié)構(gòu)頻率,計算其阻尼比,分析其動力性能,驗證加固方法的有效性。同時采用有限元軟件ANSYS進行跑車試驗?zāi)M,進一步測定橋梁的動力特性并驗證加固效果顯著,為今后橋梁評定提供依據(jù)。
[Abstract]:Under the influence of external load and other factors, the bridge will be damaged in different degree, and its bearing capacity and structure function will decrease.In addition, in recent years, with the rapid growth of traffic volume, heavy vehicles are becoming more and more serious. Many existing bridges have been unable to meet the requirements of their use, and some even face the danger of collapse.Therefore, the reinforcement of damaged bridges and the detection of reinforcement effect are particularly important, which is of great significance to the safe operation of bridges.In this paper, the reinforcement of an existing reinforced concrete damaged bridge is systematically studied.First of all, the damage of the bridge is inspected, the reinforcement scheme is determined according to the results of the inspection and the damage evaluation, and the reinforcement measures are carried out. Then, the load test of the strengthened bridge includes the load bearing capacity and the dynamic performance of the strengthened bridge.Determine the effectiveness of the reinforcement program.The main tasks were as follows:1. Summarize the damage types and reinforcement methods.The damage types of reinforced concrete bridges are summarized, and the damage mechanism and influencing factors are analyzed. The general reinforcement methods of reinforced concrete bridges are summarized, and the advantages and disadvantages of each reinforcement method and its application are expounded.2. The damage of the reinforced concrete bridge is checked.The reinforced concrete bridge is a continuous reinforced concrete bridge with four holes. By checking the whole appearance of the superstructure, substructure and subgrade slope of the bridge, the comprehensive evaluation of the bridge is carried out according to the evaluation standard stipulated in the code.According to the evaluation conclusion and expert opinion, the reinforcement standard is designed, and the reinforcement scheme is determined. According to the calculation standard, the feasibility of the reinforcement scheme is preliminarily verified by theoretical calculation.3. Evaluate the bearing capacity and working performance of reinforced concrete bridge after reinforcement.In this paper, the initial model is established by MIDAS/CIVIL software to calculate the internal force, and the test section of the static load test is determined. Secondly, the load experiment of the bridge is carried out under the most unfavorable working conditions, and the static load simulation is carried out by the finite element method.By comparing the measured values of static load with the simulated values, the bearing capacity and working performance of the strengthened bridge are evaluated, and it is determined that the reinforcement effect is remarkable.4. Dynamic analysis of reinforced concrete bridge after reinforcement.Through the dynamic load test (including the exciting test of sports car and brake), the structure frequency of the strengthened bridge is tested, its damping ratio is calculated, its dynamic performance is analyzed, and the effectiveness of the reinforcement method is verified.At the same time, the finite element software ANSYS is used to simulate the sports car test, to further determine the dynamic characteristics of the bridge and to verify the remarkable reinforcement effect, which provides the basis for the evaluation of the bridge in the future.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441;U445.72

【參考文獻】

相關(guān)期刊論文 前10條

1 鄭繼光,王潮海,孫福申,李煜;混凝土橋梁結(jié)構(gòu)工后評價及其方法[J];東北公路;2002年02期

2 郭大進,廖錦翔,張勁泉,吳克文;橋梁加固維修技術(shù)應(yīng)用[J];公路交通科技;2004年08期

3 孫莉;劉釗;;2000～2008年美國橋梁倒塌案例分析與啟示[J];世界橋梁;2009年03期

4 顏承越;水灰比—碳化方程與抗壓強度—碳化方程的比較[J];混凝土;1994年01期

5 朱紹瑋;張宇峰;張健飛;;橋梁極限承載力研究現(xiàn)狀與發(fā)展[J];現(xiàn)代交通技術(shù);2007年01期

6 沈德建,李祖陽,吳勝興;環(huán)境溫度對混凝土中鋼筋銹蝕率的影響[J];建筑技術(shù)開發(fā);2002年03期

7 徐善華,牛荻濤,王慶霖;鋼筋混凝土結(jié)構(gòu)碳化耐久性分析[J];建筑技術(shù)開發(fā);2002年08期

8 蔣濤;曹峰銘;;基于Midas的橋梁加固模擬分析[J];企業(yè)技術(shù)開發(fā);2010年09期

9 禹智濤,韓大建;既有橋梁可靠性的綜合評估方法[J];中南公路工程;2003年03期

10 何志勇;;公路橋梁支座更換方法[J];企業(yè)科技與發(fā)展;2009年20期

相關(guān)博士學(xué)位論文 前1條

1 段成曉;鋼筋混凝土橋梁加固后可靠性評估及剩余使用壽命的研究[D];武漢大學(xué);2010年

，

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