本文選題：多跨連續(xù)隔震橋梁 + 鉛芯橡膠隔震支座��； 參考：《廣州大學(xué)》2014年碩士論文

【摘要】：地震是復(fù)雜的空間運(yùn)動，在對平面尺寸較大的結(jié)構(gòu)進(jìn)行地震反應(yīng)分析的時候地，應(yīng)該考慮地震動的空間變化。對于多跨連續(xù)隔震橋梁而言，由于其本身自帶隔震裝置的特殊性，在行波效應(yīng)對多跨連續(xù)隔震橋影響方面的研究成果相對較少�；诖吮尘�，本文的主要研究對象為一座六跨連續(xù)隔震橋梁，在其基礎(chǔ)上進(jìn)行行波效應(yīng)研究分析。本文主要從以下幾個方面展開相關(guān)研究，并根據(jù)分析所得總結(jié)出了相應(yīng)的結(jié)論： 1、對采用鉛芯橡膠隔震支座的隔震橋梁進(jìn)行水平簡諧行波作用下的結(jié)構(gòu)響應(yīng)機(jī)理研究。本文主要從研究輸入地震動卓越周期對隔震橋梁結(jié)構(gòu)響應(yīng)的影響進(jìn)行分析。為模擬具有不同主頻率的地震動，采用具有不同頻率特性的正弦波對隔震橋梁進(jìn)行一直激勵及多點(diǎn)行波激勵來實(shí)現(xiàn)，分析結(jié)果表明：行波效應(yīng)對隔震橋梁各部分的影響有所不同，當(dāng)激勵頻率小于結(jié)構(gòu)自振周期時，行波效應(yīng)對下部結(jié)構(gòu)會出現(xiàn)不利的情況，，對隔震層不利性明顯；當(dāng)激勵頻率大于結(jié)構(gòu)自振頻率時，行波效應(yīng)對隔震橋梁都是有利的；而對于橋梁的上部結(jié)構(gòu)，任何時候行波效應(yīng)對其都是有利的。 2、采用三條地震波對鉛芯隔震橋梁進(jìn)行行波激勵下的地震反應(yīng)分析，結(jié)果表明：橋梁的地震響應(yīng)會因不同地震波的頻譜成分的差異性以及同一地震波不同波速激勵下而表現(xiàn)出很大的差異。一般來說，長周期頻譜成分越重，地震視波速越小對隔震橋梁的響應(yīng)也就越不利。 3、對隔震橋梁進(jìn)行單向、雙向以及三向行波輸入，結(jié)果表明：單維或多維行波激勵下，隔震橋梁的響應(yīng)并無明顯差異，多向激勵下縱橋向行波效應(yīng)反應(yīng)規(guī)律可參照單向輸入。行波效應(yīng)對橫橋向響應(yīng)的影響很小，基本可以忽略。 4、通過振動臺試驗(yàn)來驗(yàn)證隔震技術(shù)的有效性以及觀測兩點(diǎn)行波激勵對隔震橋梁的影響，并對試驗(yàn)?zāi)Ｐ瓦M(jìn)行有限元模擬仿真分析，驗(yàn)證振動臺試驗(yàn)以及主要結(jié)論的可靠性。
[Abstract]:Earthquake is a complex spatial movement. The spatial variation of ground motion should be taken into account in seismic response analysis of structures with large plane size. For multi-span continuous isolation bridge, due to the particularity of its own isolation device, there are few research results on the effect of traveling wave effect on multi-span continuous isolation bridge. Based on this background, the main research object of this paper is a six span continuous isolation bridge, on the basis of which the traveling wave effect is studied and analyzed. This article mainly from the following several aspects to carry out the related research, The conclusions are summarized as follows: 1. The structure response mechanism of the isolated bridge with lead-rubber isolation bearing under the action of horizontal harmonic traveling wave is studied. In this paper, the effect of the excellent period of input ground motion on the response of isolated bridge structure is studied. In order to simulate the ground motion with different main frequencies, sine waves with different frequency characteristics are used to carry out the continuous excitation and the multi-point traveling wave excitation to the isolated bridge. The results show that the traveling wave effect has different effects on each part of the isolated bridge. When the excitation frequency is less than the natural vibration period of the structure, the traveling wave effect will be disadvantageous to the substructure, and the disadvantage to the isolation layer will be obvious. When the excitation frequency is greater than the natural vibration frequency of the structure, the traveling wave effect is beneficial to the isolated bridge, while for the superstructure of the bridge, the traveling wave effect is beneficial to the isolated bridge. The traveling wave effect is beneficial to the bridge at any time. 2. Using three seismic waves to analyze the seismic response of lead-core isolated bridge under traveling wave excitation, The results show that the seismic response of the bridge will be greatly different due to the difference of the spectral components of different seismic waves and the excitation of the same seismic wave with different velocities. Generally speaking, the heavier the long-period spectrum is, the less the apparent velocity of seismic waves is, and the less the seismic velocity is, the less the seismic response of isolated bridges is. 3. The one-way, bidirectional and three-way traveling-wave inputs are carried out on the isolated bridges. The results show that there is no significant difference in response of isolated bridges under single or multidimensional traveling wave excitation, and the response law of longitudinal traveling wave effect can be referred to unidirectional input under multi-direction excitation. The traveling wave effect has little effect on the transverse bridge response and can be neglected. 4. The vibration table test is used to verify the effectiveness of the isolation technique and to observe the effect of the two-point traveling wave excitation on the seismic isolation bridge. The finite element simulation analysis of the test model is carried out to verify the reliability of the shaking table test and the main conclusions.
【學(xué)位授予單位】：廣州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U442.55

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