【摘要】：近年來,鐵路已逐漸成為我國交通運輸?shù)闹匾M成部分,我國鐵路橋梁建設事業(yè)方興未艾。這些橋梁中跨河跨海的不在少數(shù),因此對鐵路橋梁在河流沖刷作用下的走行安全性分析是基于我國目前工程實際的迫切需要,同時也越來越受到人們的關注。本文對群樁基礎的鐵路橋梁在河流沖刷作用下的動力響應進行分析,為跨河鐵路橋梁的安全性研究提供參考,主要工作包括如下幾個方面： 1.系統(tǒng)總結了車橋耦合及群樁沖刷的研究現(xiàn)狀,對比了國內(nèi)外群樁沖刷深度的計算方法。 2.分析了沖刷機理、群樁與土體相互作用機理和沖刷對群樁基礎等效剛度的影響,詳細介紹了用地基系數(shù)法計算沖刷前后群樁基礎的等效剛度矩陣。 3.結合改長圖線牡丹江特大橋的工程實際,計算了該工程在其水文地質(zhì)條件下,群樁沖刷深度及沖刷前后群樁基礎的等效剛度,對比分析了計算結果。 4.根據(jù)改長圖線牡丹江特大橋的工程實際,建立車橋耦合有限元模型。其中車輛由50節(jié)C70貨車組成,以空間梁單元模擬梁體、橋墩、承臺及樁身,以剛性連接模擬各墩墩帽的連接,以彈性連接模擬承臺與樁頂之間的連接。本文采用德國低干擾譜轉(zhuǎn)換的時域不平順樣本,對比計算了沖刷前后橋梁和車體的動力響應,分析了計算結果。
[Abstract]:In recent years, railway has gradually become an important part of transportation in China, and railway bridge construction is in the ascendant. There are not a few bridges that cross rivers and seas, so the safety analysis of railway bridges under the action of river scour is based on the urgent need of our country's current engineering practice, and people pay more and more attention at the same time. In this paper, the dynamic response of railway bridge with pile group foundation under the action of river erosion is analyzed, which provides a reference for the safety research of railway bridge across river. The main work includes the following aspects: 1. This paper systematically summarizes the research status of vehicle-bridge coupling and pile group erosion, and compares the calculation methods of pile group erosion depth at home and abroad. 2. The scouring mechanism, interaction mechanism between pile group and soil and the effect of scouring on the equivalent stiffness of pile group foundation are analyzed. The equivalent stiffness matrix of pile group foundation before and after scouring is calculated by the method of foundation coefficient in detail. 3. Combined with the engineering practice of the Mudanjiang Bridge in the long drawing line, the erosion depth of pile group and the equivalent stiffness of pile group foundation before and after erosion are calculated under its hydrogeological conditions, and the calculation results are compared and analyzed. 4. According to the engineering practice of Mudanjiang Bridge, the coupled finite element model of vehicle-bridge is established. The vehicle is composed of 50 C70 trucks. The spatial beam element is used to simulate the connection of beam, pier, cap and pile body, the rigid connection is used to simulate the connection of pier cap, and the connection between cap and pile cap is simulated by elastic connection. In this paper, the dynamic responses of bridges and car bodies before and after scouring are compared and calculated by using the time-domain irregularity samples of low interference spectrum conversion in Germany, and the calculated results are analyzed.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：U298;U447

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