本文關(guān)鍵詞： 剛架拱橋 主拱肋 橫系梁 微彎板 加固　出處：《廣西大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以廣西欽州永福大橋加固工程為研究對(duì)象,對(duì)該橋的主拱肋、橫系梁和微彎板的加固方法進(jìn)行深入的分析。加固后的成橋荷載試驗(yàn)表明,結(jié)構(gòu)承載力及動(dòng)力穩(wěn)定穩(wěn)定性能均達(dá)到預(yù)期效果。采用的加固方法具有施工工期較短,不影響交通,造價(jià)合理等優(yōu)點(diǎn)。本文主要研究成果如下： (1)針對(duì)主拱肋局部較易出現(xiàn)裂縫的特點(diǎn),研究主拱肋粘貼鋼板加固法,采用有限元軟件對(duì)主拱肋粘貼鋼板加固前后的應(yīng)力變化計(jì)算分析,結(jié)果表明粘貼鋼板對(duì)主拱肋不同加固部位的加固效果有明顯差異；同時(shí)粘鋼厚度的變化對(duì)各部位的加固效果影響不同,實(shí)際加固中應(yīng)根據(jù)加固部位選取適宜的鋼板厚度。 (2)針對(duì)該橋橫向聯(lián)系薄弱、整體剛度差的特點(diǎn),研究橫系梁加固方法,采用ANSYS軟件對(duì)橫系梁連接處的損傷模擬及橫系梁附加型鋼加固法加固后的動(dòng)力特性變化計(jì)算分析,結(jié)果表明,附加型鋼法可以較好改善剛架拱的動(dòng)力性能；與常規(guī)的加固法計(jì)算對(duì)比分析,表明其加固效果次于增大截面法而優(yōu)于節(jié)點(diǎn)包鋼法,綜合分析,附加型鋼法是剛加拱橋橫系梁加固的優(yōu)選方案。 (3)針對(duì)橋面微彎板的承載力不足的特點(diǎn),研究微彎板加固法,采用二次分析法計(jì)算微彎板曲面型鋼加固法加固后的受力狀態(tài),結(jié)果表明曲面型鋼可以有效改善微彎板應(yīng)力狀態(tài)；理論值與實(shí)測(cè)值對(duì)比分析表明型鋼梁與微彎板形成組合結(jié)構(gòu),改善了微彎板的受力,加固后結(jié)構(gòu)受力性能優(yōu)良；與常規(guī)的加固法計(jì)算對(duì)比分析,表明其對(duì)微彎板應(yīng)力改善效果介于增大加勁肋法與錨噴混凝土加固法之間；但其微彎板加勁肋處的應(yīng)力相對(duì)較大,采用該法時(shí)建議對(duì)微彎板加勁肋采取防裂措施。 (4)通過計(jì)算分析不同荷載布置工況對(duì)該橋的穩(wěn)定性的影響,結(jié)果表明加固后可以有效改善橋梁的偏載效應(yīng),即提高偏載作用下的穩(wěn)定性能。 (5)靜力試驗(yàn)分析表明,加固后橋梁的剛度、強(qiáng)度滿足要求,整體橋梁處于彈性受力狀態(tài),承載力滿足要求；動(dòng)力試驗(yàn)分析表明,此次加固對(duì)該橋的整體剛度的提高效果明顯,橋梁橫向聯(lián)系在加固后得到明顯改善,說明采用的加固方法是可行的,達(dá)到了預(yù)期效果。 本文的研究成果為在役鋼筋混凝土剛架拱橋的加固提供了對(duì)比數(shù)據(jù)參考,也為類似橋型的加固提拱參考借鑒。
[Abstract]:In this paper, the reinforcement project of Yongfu Bridge in Qinzhou, Guangxi is taken as the research object, and the reinforcement methods of the main arch rib, transverse beam and micro-bending plate of the bridge are deeply analyzed. The structural bearing capacity and dynamic stability are expected. The reinforcement method has the advantages of short construction period, no impact on traffic, reasonable cost and so on. The main research results of this paper are as follows: 1) according to the characteristic that the main arch rib is prone to crack, the paper studies the reinforcement method of the main arch rib with steel plate, and uses the finite element software to calculate and analyze the stress change before and after the main arch rib is bonded with the steel plate. The results show that there are obvious differences in the reinforcement effect of the main arch rib with the sticking steel plate. At the same time, the influence of the thickness of bonded steel on the reinforcement effect is different, so the appropriate thickness of steel plate should be selected according to the strengthening position in practice. 2) in view of the weak transverse connection and the poor overall stiffness of the bridge, the reinforcement method of the transverse tie beam is studied. The ANSYS software is used to simulate the damage at the joint of the transverse beams and the dynamic characteristics of the beams strengthened by the additional section steel are calculated and analyzed. The results show that. The dynamic performance of rigid frame arch can be improved by adding steel. Compared with the conventional reinforcement method, the results show that the reinforcement effect is inferior to that of the increasing section method and is better than that of the nodal steel-clad method. In the comprehensive analysis, the additional steel method is the optimal scheme for strengthening the crossbeam of the rigid-arch bridge. 3) in view of the insufficient bearing capacity of the micro-bending slab on the bridge deck, the reinforcement method of micro-bending plate is studied, and the stress state of the curved steel reinforcement method of the micro-bending plate is calculated by using the quadratic analysis method. The results show that curved steel can effectively improve the stress state of micro-bending plate. The comparison between the theoretical value and the measured value shows that the composite structure is formed between the steel beam and the micro-bending plate, which improves the force of the micro-bending plate, and the mechanical performance of the strengthened structure is good. Compared with the conventional reinforcement method, the results show that the effect of improving the stress of micro-bending slab is between the stiffening stiffener method and the bolting and shotcrete reinforcement method. However, the stress at the stiffening rib of the micro-bending plate is relatively large, so it is suggested that anti-crack measures should be taken for the stiffening rib of the micro-bending plate. 4) the influence of different load arrangement conditions on the stability of the bridge is analyzed. The results show that the strengthened bridge can effectively improve the eccentric load effect of the bridge, that is, to improve the stability performance of the bridge under the eccentric load. 5) the static test results show that the stiffness and strength of the strengthened bridge meet the requirements, the whole bridge is in an elastic stress state, and the bearing capacity meets the requirements. The dynamic test results show that the effect of this reinforcement on the overall stiffness of the bridge is obvious, and the transverse connection of the bridge is obviously improved after reinforcement, which shows that the reinforcement method is feasible and achieves the expected effect. The research results of this paper provide a reference for the reinforcement of reinforced concrete rigid frame arch bridge in service, and also for the similar bridge type reinforcement and arch lifting reference.
【學(xué)位授予單位】：廣西大學(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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本文編號(hào)：1451959