發(fā)布時間：2019-01-01 08:59

【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(shè)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(guān)注。本文對群樁基礎(chǔ)的鐵路橋梁在河流沖刷作用下的動力響應(yīng)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(jié)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(chǔ)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(chǔ)的等效剛度矩陣。 3.結(jié)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(chǔ)的等效剛度,對比分析了計算結(jié)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(yīng),分析了計算結(jié)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(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：U298;U447

【參考文獻】

相關(guān)期刊論文 前10條

1 孫劍平,朱f^,倪永軍;樁基礎(chǔ)的動力群樁效應(yīng)[J];北方交通大學(xué)學(xué)報;2001年04期

2 李運生,閻貴平,鐘鐵毅;鐵路列車作用下輕型橋墩橫向振動試驗研究[J];北方交通大學(xué)學(xué)報;2004年04期

3 張彌，夏禾，馮愛軍;輕軌列車和高架橋梁系統(tǒng)的動力響應(yīng)分析[J];北方交通大學(xué)學(xué)報;1994年01期

4 范俊杰，夏禾，王小文，，彭華;高速軌道的動力分析與結(jié)構(gòu)模式[J];北方交通大學(xué)學(xué)報;1996年02期

5 王慶波,汪勝,許克賓,夏禾;高速鐵路連續(xù)梁橋動力響應(yīng)分析[J];北方交通大學(xué)學(xué)報;1997年04期

6 單德山,李喬;考慮樁土作用的鐵路曲線梁橋車橋耦合振動分析[J];重慶交通學(xué)院學(xué)報;2004年06期

7 徐錫榮,唐洪武,王志良,肖洋;潤揚大橋橋墩沖刷模型設(shè)計[J];人民長江;2004年03期

8 盧中一,高正榮,吳麗華,袁文志;南京長江三橋橋墩基礎(chǔ)的局部沖刷[J];人民長江;2005年10期

9 齊梅蘭;孟國清;;河道采沙對大橋基礎(chǔ)安全影響研究[J];水動力學(xué)研究與進展(A輯);2005年06期

10 費勤發(fā),馬海龍;分層總和法在群樁非線性分析中的應(yīng)用——變形總和法[J];上海力學(xué);1997年01期

相關(guān)碩士學(xué)位論文 前1條

1 李成才;橋墩局部沖刷試驗及計算理論研究[D];河海大學(xué);2007年

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