本文選題：鉛芯橡膠支座 + 減震��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：地震對鐵路公路橋梁造成的破壞十分嚴重,橋梁先進的抗震設(shè)計理論和有效減震技術(shù)愈顯重要。鉛芯橡膠支座兼有隔震器和阻尼器的結(jié)構(gòu)特點,具有工程造價低、施工方便、材料易得和力學(xué)性能穩(wěn)定等優(yōu)點,在工程領(lǐng)域被廣泛研究和應(yīng)用。為了研究鉛芯橡膠支座的減震性能,本文開展了以下幾方面的研究工作:(1)介紹了鉛芯橡膠支座耗能原理與橋梁結(jié)構(gòu)動力學(xué)分析方法,基于橋梁結(jié)構(gòu)動力平衡方程,通過小變形理論、平截面假定及位移邊界條件推導(dǎo)出了梁的單元質(zhì)量矩陣、單元剛度矩陣、單元阻尼矩陣。(2)以實際橋梁為工程算例,利用ANSYS軟件建立了鉛芯橡膠支座的有限元模型,研究了鉛芯橡膠支座的滯回特性。(3)建立了板式橡膠支座和采用鉛芯橡膠支座的橋梁模型,分析不同支座橋梁模型的模態(tài)參數(shù),計算結(jié)果表明,采用鉛芯橡膠支座橋梁的模態(tài)頻率較小。(4)采用寧河天津波,通過對兩種不同支座橋梁的地震時程分析,分析得出梁體及橋墩的位移時程曲線、應(yīng)力時程曲線和基礎(chǔ)反力時程曲線,并計算支座的減震率。計算結(jié)果表明,鉛芯橡膠支座的隔震效果明顯。(5)研究了橋墩高度對減震效果的影響。結(jié)果表明,隨著橋墩高度的增加,鉛芯橡膠支座的減震效果降低。
[Abstract]:The damage caused by earthquake to railway bridges is very serious. The advanced seismic design theory and effective damping technology of bridges are more and more important. Lead rubber bearing has the structural characteristics of both shock isolators and dampers. It has the advantages of low engineering cost, easy construction, easy material availability and stable mechanical properties, and has been widely studied and applied in engineering field. In order to study the vibration absorption performance of lead rubber bearing, the following research work is carried out in this paper. The principle of energy dissipation of lead rubber bearing and the dynamic analysis method of bridge structure are introduced in this paper, based on the dynamic balance equation of bridge structure. Based on the theory of small deformation, the assumption of plane section and the displacement boundary condition, the element mass matrix, element stiffness matrix and element damping matrix of the beam are derived. The finite element model of lead rubber bearing is established by using ANSYS software. The hysteretic characteristic of lead rubber bearing is studied. The bridge models of plate rubber bearing and lead rubber bearing are established, and the modal parameters of different bearing bridge models are analyzed. The calculated results show that the modal frequency of the lead-rubber bearing bridge is smaller. (4) using the Tianjin wave of Ninghe River, the displacement time history curves of beam and pier are obtained by analyzing the seismic time history of two different kinds of supported bridges. The stress time history curve and the foundation reaction history curve are used to calculate the shock absorption rate of the bearing. The results show that the vibration isolation effect of lead rubber bearing is obvious. The results show that the damping effect of lead rubber bearing decreases with the increase of pier height.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.55;U443.36

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