【摘要】：斜拉橋跨越能力較強(qiáng),造型美觀。作為交通運(yùn)輸?shù)闹匾M成,斜拉橋一旦在地震中受到破壞或者損壞,會(huì)導(dǎo)致交通中斷,帶來較大的經(jīng)濟(jì)損失,我國地震的多發(fā)性決定了抗震分析在橋梁結(jié)構(gòu)設(shè)計(jì)中的重要性。本文主要研究了土-結(jié)構(gòu)動(dòng)力相互作用對(duì)斜拉橋地震響應(yīng)的影響,以一座獨(dú)塔預(yù)應(yīng)力混凝土斜拉橋?yàn)楣こ瘫尘?采用有限元方法進(jìn)行地震響應(yīng)分析,主要進(jìn)行了以下幾個(gè)方面的工作：(1)對(duì)工程上常用的土-結(jié)構(gòu)動(dòng)力相互作用的物理模型進(jìn)行總結(jié)和分析；(2)采用六彈簧法和全樁分散彈簧法兩種土-結(jié)構(gòu)動(dòng)力相互作用模型,對(duì)考慮土—結(jié)構(gòu)動(dòng)力相互作用前后斜拉橋的自振特性進(jìn)行分析。結(jié)果表明,在考慮了土-結(jié)構(gòu)動(dòng)力相互作用后,斜拉橋的基頻和高階頻率均降低,部分高階振型發(fā)生改變；(3)在縱向+豎向和橫向+豎向兩種地震波輸入模式下,計(jì)算了基礎(chǔ)固結(jié)模式和全樁分布彈簧模式下斜拉橋的地震時(shí)程響應(yīng),比較分析了土-結(jié)構(gòu)動(dòng)力相互作用對(duì)斜拉橋地震響應(yīng)的影響,結(jié)果表明,若不考慮土-結(jié)構(gòu)動(dòng)力相互作用,斜拉橋的抗震設(shè)計(jì)將會(huì)偏于不安全；(4)計(jì)算比較了一致激勵(lì)和多點(diǎn)激勵(lì)下斜拉橋的地震時(shí)程響應(yīng),分析了不同地震波速下行波效應(yīng)對(duì)斜拉橋地震響應(yīng)的影響。計(jì)算結(jié)果表明,在獨(dú)塔預(yù)應(yīng)力混凝土斜拉橋抗震設(shè)計(jì)計(jì)算中,應(yīng)該考慮土-結(jié)構(gòu)動(dòng)力相互作用對(duì)主塔和主梁的影響和行波效應(yīng)對(duì)邊墩的影響。
[Abstract]:The cable-stayed bridge has strong span ability and beautiful shape. As an important component of transportation, once cable-stayed bridge is damaged or damaged in earthquake, it will lead to traffic interruption and bring great economic losses. The earthquake frequency in our country determines the importance of seismic analysis in bridge structure design. In this paper, the influence of soil-structure dynamic interaction on the seismic response of cable-stayed bridge is studied. Taking a single-tower prestressed concrete cable-stayed bridge as the engineering background, the finite element method is used to analyze the seismic response. The main work is as follows: (1) summarize and analyze the common physical model of soil-structure dynamic interaction in engineering; (2) two kinds of soil-structure dynamic interaction models, six spring method and full pile dispersion spring method, are used to analyze the natural vibration characteristics of cable-stayed bridge before and after considering soil-structure dynamic interaction. The results show that when the soil-structure dynamic interaction is taken into account, the fundamental frequency and high order frequency of the cable-stayed bridge decrease, and some of the higher-order modes change. (3) the seismic time-history responses of cable-stayed bridges under the consolidation mode of foundation and the distributed spring mode of piles are calculated under the vertical and horizontal vertical seismic wave input modes. The effect of soil-structure dynamic interaction on the seismic response of cable-stayed bridge is compared and analyzed. The results show that the seismic design of cable-stayed bridge will be unsafe if the soil-structure dynamic interaction is not considered. (4) the seismic time-history response of cable-stayed bridge under uniform excitation and multi-point excitation is calculated and compared, and the influence of downlink wave effect of different seismic wave velocities on seismic response of cable-stayed bridge is analyzed. The results show that in the seismic design of prestressed concrete cable-stayed bridge with single tower, the influence of soil-structure dynamic interaction on the main tower and main beam and the effect of traveling wave on the side pier should be considered.
【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】：2015
【分類號(hào)】：U442.55;U448.27

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本文編號(hào)：2410611