本文選題：中下承式拱橋　切入點(diǎn)：吊桿　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：中下承式拱橋得益于自身受力合理、造型美觀等特點(diǎn),近些年得到了極大的發(fā)展。而吊桿作為連接拱肋和橋道系的關(guān)鍵構(gòu)件,將橋道系所承受的恒載、活載傳遞到拱肋上,為中下承式拱橋主要的承重構(gòu)件。與橋道系和拱肋相比,吊桿更易受到疲勞或腐蝕的破壞,吊桿出現(xiàn)問題,情況嚴(yán)重時(shí)可導(dǎo)致橋道系的垮塌,在一定程度上決定了中下承式拱橋的安全與壽命。本文針對(duì)吊桿發(fā)生破斷對(duì)橋梁結(jié)構(gòu)產(chǎn)生的動(dòng)力響應(yīng)進(jìn)行研究,以鄭州劉江黃河大橋?yàn)楣こ瘫尘?運(yùn)用ANSYS有限元軟件,建立鄭州劉江黃河大橋標(biāo)準(zhǔn)跨精細(xì)梁?jiǎn)卧Ｐ?研究了單根吊桿破斷和多根吊桿連續(xù)破斷時(shí)結(jié)構(gòu)的動(dòng)力響應(yīng),并且與靜力方法計(jì)算結(jié)果進(jìn)行對(duì)比。論文主要研究?jī)?nèi)容和所得結(jié)論如下:(1)采用ANSYS有限元軟件,建立了鄭州劉江黃河大橋標(biāo)準(zhǔn)跨的空間有限元計(jì)算模型,利用計(jì)算得出的吊桿成橋索力值與設(shè)計(jì)圖紙給出的設(shè)計(jì)值進(jìn)行對(duì)比,來驗(yàn)證有限元模型的正確性。(2)對(duì)比分析了兩種模擬吊桿破斷方法的優(yōu)劣,確定本文采用的模擬方法。根據(jù)最不利荷載的原則選取破斷吊桿,確定模擬過程中的阻尼矩陣,確定吊桿破斷時(shí)間,分別以短吊桿破斷和長(zhǎng)吊桿破斷兩種工況對(duì)結(jié)構(gòu)的動(dòng)力響應(yīng)進(jìn)行研究。(3)吊桿發(fā)生破斷對(duì)橋道系的影響要大于對(duì)拱肋的影響,并且隨著距離吊桿破斷位置的增加,影響逐漸減小;吊桿發(fā)生連續(xù)破斷時(shí),會(huì)造成相鄰吊桿內(nèi)力的急劇增大,若吊桿安全系數(shù)設(shè)置過小,極有可能造成剩余吊桿接連破斷,導(dǎo)致橋道系的垮塌。(4)對(duì)比吊桿破斷時(shí)動(dòng)力分析結(jié)果與靜力分析結(jié)果可以看出,靜力方法計(jì)算得出的橋梁力學(xué)性能與動(dòng)力分析得出的橋梁力學(xué)性能有很大的差異,在實(shí)際工程中,不能直接用靜力分析方法來替代吊桿破斷動(dòng)力分析方法。
[Abstract]:The middle through arch bridge has been greatly developed in recent years because of its reasonable force and beautiful shape. As a key member of connecting arch rib and bridge track system, the suspender transfers the dead load to the arch rib from dead load to the arch rib. It is the main load-bearing member of the middle through arch bridge. Compared with the bridge track system and arch rib, the suspension rod is more easily damaged by fatigue or corrosion, and the suspension rod has problems, which can lead to the collapse of the bridge track system when the condition is serious. To a certain extent, the safety and life of the through arch bridge are determined. In this paper, the dynamic response of the bridge structure caused by the break of the suspension rod is studied. Taking the Yellow River Bridge of Liu Jiang in Zhengzhou as the engineering background, the finite element software ANSYS is used. The standard span fine beam element model of Liu Jiang Yellow River Bridge in Zhengzhou is established, and the dynamic response of the structure under the condition of single suspender breaking and continuous breaking of multiple suspenders is studied. The main contents and conclusions are as follows: (1) using ANSYS finite element software, the spatial finite element model of the standard span of Liu Jiang Yellow River Bridge in Zhengzhou is established. In order to verify the correctness of the finite element model, the cable force of the suspension rod bridge is compared with the design value given in the design drawing, and the advantages and disadvantages of the two simulated suspender breaking methods are compared and analyzed. According to the principle of the most unfavorable load, the broken suspenders are selected, the damping matrix in the simulation process is determined, and the breaking time of the suspenders is determined. The dynamic response of the structure is studied under the two working conditions of short and long suspenders, respectively.) the influence of the breakage of the suspender on the bridge track system is greater than that on the arch rib, and the influence decreases gradually with the increase of the distance from the broken position of the suspender. If the safety factor of the suspension rod is set too small, it is very likely to cause the residual boom to break continuously, when the suspension rod breaks continuously, which will result in the sharp increase of the internal force of the adjacent suspenders, if the safety factor of the suspenders is set too small, Comparing the dynamic analysis results with the static analysis results when the suspenders break, it can be seen that the mechanical properties of the bridges calculated by the static method are quite different from the mechanical properties of the bridges obtained by the dynamic analysis. The static analysis method can not be directly used to replace the dynamic analysis method of boom breaking.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U448.22

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