本文選題：高樁承臺(tái)連續(xù)梁橋　切入點(diǎn)：動(dòng)水壓力　出處：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：隨著我國(guó)經(jīng)濟(jì)的迅速發(fā)展,橋梁建設(shè)在向大跨度發(fā)展的同時(shí),也出現(xiàn)了許多深水橋梁。由于深水橋梁都面臨較深的河水和軟弱的沉積巖,而樁基礎(chǔ)能夠穿透土層而達(dá)到較深的持力層,同時(shí)連續(xù)梁橋具有剛度大、變形小、行車平穩(wěn)舒適等突出優(yōu)點(diǎn),故深水高樁承臺(tái)連續(xù)梁橋被廣泛應(yīng)用到深水橋梁建設(shè)中。由于深水高樁承臺(tái)連續(xù)梁橋地震反應(yīng)的復(fù)雜性以及震后修復(fù)困難,因此對(duì)其進(jìn)行研究十分必要。本文以某深水高樁承臺(tái)連續(xù)梁橋?yàn)楣こ瘫尘?考慮動(dòng)水壓力效應(yīng),對(duì)其進(jìn)行地震反應(yīng)分析及抗震性能評(píng)估。主要研究工作如下:(1)通過(guò)查閱大量國(guó)內(nèi)外橋梁結(jié)構(gòu)與水相互作用的文獻(xiàn),詳細(xì)介紹了深水橋梁的地震震害;水對(duì)橋梁下部結(jié)構(gòu)的動(dòng)水壓力作用采用Morison方程等效為附加質(zhì)量考慮。(2)對(duì)深水高樁承臺(tái)連續(xù)梁橋進(jìn)行模態(tài)分析,討論動(dòng)水壓力作用對(duì)深水高樁承臺(tái)連續(xù)梁橋動(dòng)力特性的影響,并給出其在考慮動(dòng)水壓力作用下的前七階自振頻率及振型。(3)在E1地震下,對(duì)深水高樁承臺(tái)連續(xù)梁橋進(jìn)行反應(yīng)譜分析,討論動(dòng)水壓力作用對(duì)非水中橋墩和水中橋墩及樁身彎矩的影響,并對(duì)非水中橋墩和水中橋墩及樁基礎(chǔ)的抗震性能進(jìn)行評(píng)估。(4)在E2地震下,對(duì)深水高樁承臺(tái)連續(xù)梁橋進(jìn)行彈塑性時(shí)程分析,并對(duì)非水中橋墩和水中橋墩及樁基礎(chǔ)的抗震性能進(jìn)行評(píng)估。(5)采用摩擦擺減隔震支座對(duì)深水高樁承臺(tái)連續(xù)梁橋進(jìn)行減隔震設(shè)計(jì),通過(guò)對(duì)摩擦擺減隔震支座進(jìn)行參數(shù)分析,研究了摩擦擺減隔震支座滑動(dòng)曲面半徑、摩擦系數(shù)對(duì)墩底峰值彎矩、支座位移的影響。研究了摩擦擺減隔震支座的減震效果,并對(duì)非水中橋墩和水中橋墩及樁基礎(chǔ)的抗震性能進(jìn)行評(píng)估。
[Abstract]:With the rapid development of China's economy, many deep-water bridges have emerged while the bridge construction is developing to a large span.Because deep-water bridges are faced with deeper river water and weak sedimentary rock, pile foundation can penetrate the soil layer to reach deeper bearing layer, and continuous beam bridge has many outstanding advantages, such as high stiffness, small deformation, smooth and comfortable running, etc.Therefore, deep-water continuous beam bridge with high pile cap is widely used in deep water bridge construction.Because of the complexity of seismic response and the difficulty of post-earthquake repair of continuous beam bridge with high pile cap in deep water, it is necessary to study it.In this paper, the seismic response analysis and seismic performance evaluation of a continuous beam bridge with high pile cap in deep water are carried out considering the effect of hydrodynamic pressure.The main research work is as follows: (1) the earthquake damage of deep water bridge is introduced in detail by consulting a large number of literatures on the interaction between bridge structure and water at home and abroad.The effect of water on the dynamic water pressure of the bridge understructure is equivalent to the consideration of additional mass by Morison equation. The modal analysis of deep water high pile cap continuous beam bridge is carried out, and the effect of dynamic water pressure on the dynamic characteristics of deep water high pile cap continuous beam bridge is discussed.The first seven natural frequencies and vibration modes of the bridge under dynamic water pressure are given. Under E1 earthquake, the response spectrum of continuous beam bridge with high pile cap in deep water is analyzed.This paper discusses the effect of hydrodynamic pressure on bending moment of bridge pier and bridge pier and pile body in water, and evaluates the seismic behavior of bridge pier and bridge pier and pile foundation under E _ 2 earthquake.The elastoplastic time history analysis of deep water continuous beam bridge with high pile cap is carried out, and the seismic performance of non-water pier and water pier and pile foundation are evaluated.The influence of sliding surface radius and friction coefficient on the peak bending moment and displacement of the base of the abutment are studied by analyzing the parameters of the frictional pendulum isolation bearing.In this paper, the seismic absorption effect of friction pendulum abutment is studied, and the seismic performance of non-water piers, underwater piers and pile foundations is evaluated.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55

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本文編號(hào)：1725509