【摘要】：在近年來歷次地震中,鐵路橋梁破壞嚴重,其中支座破壞是橋梁破壞的主要形式之一。因此,有必要深入研究支座的不同傳力方式,分析支座破壞狀態(tài)對橋墩地震反應的影響。本文針對球型鋼支座,以某高速鐵路橋梁為研究對象,建立軌道系統(tǒng)為CRTSⅡ板式無砟軌道的線橋一體化計算模型,并與不考慮軌道剛度影響的傳統(tǒng)計算模型進行對比分析,研究罕遇地震下支座破壞對橋墩地震反應的影響。本文主要工作如下:(1)收集整理了支座的不同工作狀態(tài)對橋梁的地震反應影響的研究文獻,介紹了支座震害特點和國內外支座破壞的研究現(xiàn)狀,總結了CRTSⅡ板式無砟軌道線橋一體化模型在不同設防等級下的建模方法。(2)以十跨簡支梁橋及連續(xù)梁橋作為研究對象,采用SAP2000軟件建立不考慮軌道約束的傳統(tǒng)計算模型和考慮軌道約束的線橋一體化模型,進行了動力特性分析。結果表明,軌道約束對高速鐵路橋梁的動力特性影響較大。(3)選取鐵路橋梁中廣泛使用的球型鋼支座,基于傳統(tǒng)計算模型,分析了支座的受力特點以及支座破壞對橋墩地震反應的影響。結果表明,在地震作用下,對于墩高相近的簡支梁橋,同一橋墩的兩排支座同時進入干摩擦狀態(tài)之后,該墩地震反應明顯降低;對于連續(xù)梁橋,固定支座進入干摩擦狀態(tài)之后,固定墩地震反應明顯降低。(4)基于線橋一體化抗震模型,分析了罕遇地震下支座破壞對橋墩地震反應的影響。結果表明,軌道約束對簡支梁橋支座破壞后橋墩的地震反應有削弱作用,而對連續(xù)梁橋各墩地震反應有放大作用。
文內圖片：
圖片說明：碼頭大橋支座破壞
[Abstract]:In recent years, railway bridges have been damaged seriously, among which bearing failure is one of the main forms of bridge failure. Therefore, it is necessary to study the different force transfer modes of the bearing and analyze the influence of the failure state of the bearing on the seismic response of the pier. In this paper, aiming at the spherical steel bearing, taking a high-speed railway bridge as the research object, the integrated calculation model of the track system as CRTS II slab ballastless track is established, and compared with the traditional calculation model without considering the influence of track stiffness, the influence of bearing failure on the seismic response of bridge pier under rare earthquake is studied. The main work of this paper is as follows: (1) the research literature on the influence of different working states of supports on the seismic response of bridges is collected and sorted out, the characteristics of bearing earthquake damage and the research status of bearing failure at home and abroad are introduced, and the modeling methods of CRTS II slab ballastless track bridge integration model under different fortification grades are summarized. (2) Ten-span simply supported beam bridges and continuous beam bridges are taken as the research objects. The traditional calculation model without considering track constraint and the integrated model of line and bridge considering track constraint are established by using SAP2000 software, and the dynamic characteristics are analyzed. The results show that the track constraint has a great influence on the dynamic characteristics of high-speed railway bridges. (3) based on the traditional calculation model, the bearing characteristics and the influence of bearing failure on the seismic response of high-speed railway bridges are analyzed. (3) the spherical steel bearings widely used in railway bridges are selected, and based on the traditional calculation model, the bearing characteristics and the influence of bearing failure on seismic response of piers are analyzed. The results show that under the action of earthquake, for the simply supported beam bridge with similar pier height, the seismic response of the pier decreases obviously after the two rows of supports of the same pier enter the dry friction state at the same time; for the continuous beam bridge, the seismic response of the fixed pier decreases obviously after the fixed support enters the dry friction state. (4) based on the integrated seismic model of the line bridge, the influence of bearing failure on the seismic response of the pier under rare earthquake is analyzed. The results show that the track constraint can weaken the seismic response of the pier after the support failure of the simply supported beam bridge, but amplify the seismic response of each pier of the continuous beam bridge.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55

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本文編號：2511769