發(fā)布時(shí)間：2018-04-09 19:21

  本文選題：鋼筋混凝土橋梁　切入點(diǎn)：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(guò)程中會(huì)受到不同程度的損傷,其承載力和結(jié)構(gòu)功能均會(huì)下降。加之近年來(lái),交通量飛速增長(zhǎng),車(chē)輛重型化日趨嚴(yán)重,很多既有橋梁已經(jīng)無(wú)法滿(mǎn)足其使用要求,有些甚至面臨坍塌的危險(xiǎn)。因此,損傷橋梁的加固及加固效果的檢測(cè)顯得尤其重要,對(duì)橋梁的安全運(yùn)營(yíng)具有重要意義。 本文對(duì)某既有鋼筋混凝土損傷橋梁的加固進(jìn)行了系統(tǒng)研究。首先對(duì)其損傷情況進(jìn)行檢查,根據(jù)檢查結(jié)果和損傷評(píng)定確定加固方案,實(shí)施加固措施；然后對(duì)加固后的橋梁進(jìn)行荷載試驗(yàn)包括承載能力和動(dòng)力性能兩方面的檢測(cè),確定加固方案的有效性。主要開(kāi)展了如下工作： 1、歸納總結(jié)損傷類(lèi)型和加固方法。歸納鋼筋混凝土橋梁的損傷類(lèi)型,并分析損傷機(jī)理和影響因素以及對(duì)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(gè)加固方法的優(yōu)缺點(diǎn)和適用情況。 2、對(duì)該鋼筋混凝土橋梁進(jìn)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(guò)對(duì)該橋進(jìn)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(píng)定標(biāo)準(zhǔn)對(duì)橋梁進(jìn)行綜合評(píng)定。以評(píng)定結(jié)論和專(zhuān)家意見(jiàn)設(shè)計(jì)加固標(biāo)準(zhǔn),并確定加固方案,根據(jù)計(jì)算標(biāo)準(zhǔn),通過(guò)理論計(jì)算初步驗(yàn)證加固方案的可行性。 3、對(duì)加固后的鋼筋混凝土橋梁進(jìn)行承載能力和工作性能評(píng)定。本文首先利用MIDAS/CIVIL軟件建立初始模型進(jìn)行內(nèi)力計(jì)算,確定靜載試驗(yàn)的測(cè)試截面；其次選取最不利工況對(duì)橋梁進(jìn)行荷載實(shí)驗(yàn),并通過(guò)有限元進(jìn)行靜載模擬,通過(guò)比較靜載實(shí)測(cè)值和模擬值,對(duì)加固后橋梁的承載能力和工作性能進(jìn)行評(píng)定,確定加固效果顯著。 4、對(duì)加固后的鋼筋混凝土橋梁進(jìn)行動(dòng)力分析。通過(guò)對(duì)該加固后橋梁進(jìn)行動(dòng)載試驗(yàn)(包括跑車(chē)和剎車(chē)的激振試驗(yàn)),測(cè)試橋梁的結(jié)構(gòu)頻率,計(jì)算其阻尼比,分析其動(dòng)力性能,驗(yàn)證加固方法的有效性。同時(shí)采用有限元軟件ANSYS進(jìn)行跑車(chē)試驗(yàn)?zāi)M,進(jìn)一步測(cè)定橋梁的動(dòng)力特性并驗(yàn)證加固效果顯著,為今后橋梁評(píng)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(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U441;U445.72

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