本文選題：曲線斜拉橋　切入點(diǎn)：地震響應(yīng)分析　出處：《西南交通大學(xué)》2017年碩士論文

【摘要】：曲線斜拉橋是主梁沿線路走向呈曲線型布置的斜拉橋,由于其具有曲線形的主梁,從而在彎扭耦合效應(yīng)下表現(xiàn)出空間耦聯(lián)性。這使得斜拉索的空間布置和受力復(fù)雜化,塔、梁、索三者組成的整體結(jié)構(gòu)在動(dòng)力作用下的受力狀態(tài)變得十分復(fù)雜。因此,有必要對(duì)曲線斜拉橋在地震動(dòng)作用下的響應(yīng)特征進(jìn)行深入地研究分析。本文以剛果布拉柴.維爾濱河大道曲線斜拉橋?yàn)閷?shí)際工程依托,建立了該橋的有限元模型,對(duì)其進(jìn)行了地震響應(yīng)特征及其影響因素分析。本文主要進(jìn)行了以下幾個(gè)方面的工作:1.總結(jié)了橋梁結(jié)構(gòu)在地震作用下的主要災(zāi)害類型,對(duì)現(xiàn)有的橋梁結(jié)構(gòu)地震響應(yīng)分析方法進(jìn)行了概括和綜述,并專門對(duì)斜拉橋地震響應(yīng)的研究現(xiàn)狀做了分析和綜述。2.針對(duì)曲線斜拉橋的特點(diǎn),建立了有限元模型,在此基礎(chǔ)上對(duì)依托工程曲線斜拉橋的動(dòng)力特性進(jìn)行了深入分析。分析了主梁圓心角和塔梁連接形式兩個(gè)不同的結(jié)構(gòu)參數(shù)對(duì)曲線斜拉橋動(dòng)力特性的影響規(guī)律。3.基于Bresler屈服面函數(shù),利用水平雙向反應(yīng)譜法考慮了水平方向內(nèi)兩個(gè)正交方向的地震動(dòng),并且基于振型組合的CQC法,推導(dǎo)了曲線斜拉橋地震動(dòng)的最不利入射角度,利用反應(yīng)譜法對(duì)不同入射角度進(jìn)行計(jì)算,得出了最不利的地震動(dòng)入射方向。在此基礎(chǔ)上分析研究了該曲線斜拉橋的位移和內(nèi)力響應(yīng)特征。4.考慮樁-土效應(yīng)、地震動(dòng)的行波效應(yīng),對(duì)在不同主梁圓心角和不同塔梁連接形式情況下的曲線斜拉橋地震響應(yīng)的變化規(guī)律進(jìn)行了深入細(xì)致的研究。
[Abstract]:Curved cable-stayed bridge is a cable-stayed bridge with curved direction along the main beam. Because of its curved main beam, it shows spatial coupling under the coupling effect of bending and torsion, which makes the spatial arrangement and force of the stay cable more complicated. The stress state of the whole structure made up of three cables under dynamic action becomes very complicated. It is necessary to deeply study and analyze the response characteristics of curved cable-stayed bridge under ground motion. In this paper, the finite element model of the curved cable-stayed bridge is established, which is based on the curved cable-stayed bridge of Congo Brazzhai River Boulevard. The characteristics of earthquake response and its influencing factors are analyzed. The main work of this paper is as follows: 1. The main disaster types of bridge structure under earthquake action are summarized. The existing seismic response analysis methods of bridge structures are summarized, and the current research situation of seismic response of cable-stayed bridges is analyzed and summarized. 2. According to the characteristics of curved cable-stayed bridges, a finite element model is established. On this basis, the dynamic characteristics of curved cable-stayed bridge supported on engineering are analyzed in depth, and the influence of two different structural parameters of main beam center-angle and pylon girder connection on the dynamic characteristics of curved cable-stayed bridge is analyzed. Based on Bresler yield surface function, the dynamic characteristics of curved cable-stayed bridge are analyzed. The horizontal bidirectional response spectrum method is used to consider the ground motion of two orthogonal directions in the horizontal direction, and the most unfavorable incident angle of the curved cable-stayed bridge ground motion is derived based on the CQC method of mode combination. The most unfavorable incident direction of ground motion is obtained by using the method of response spectrum. On this basis, the characteristics of displacement and internal force response of the curved cable-stayed bridge are analyzed. 4. Considering the pile-soil effect, the traveling wave effect of ground motion is studied. The variation law of seismic response of curved cable-stayed bridge with different center angle of main beam and different connection form of tower beam is studied in detail.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U448.27

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