【摘要】：套箱為承臺(tái)施工階段的臨時(shí)設(shè)施,由于混凝土套箱體積較大,阻水面積大,在主河槽位置導(dǎo)致沖刷加劇。套箱下部損壞及與河床進(jìn)一步分開(kāi)后,使橋墩所受荷載增大。在河流動(dòng)力作用下,套箱破損及逐步下沉、歪斜,將直接橋梁的安全性。因此,需要對(duì)鐵路高樁承臺(tái)的承載能力進(jìn)行分析,使用合適的方案進(jìn)行加固,滿(mǎn)足橋梁在使用過(guò)程中的安全性及耐久性要求。本文在總結(jié)目前關(guān)于承臺(tái)傳力模式、承載能力評(píng)估和橋梁下部結(jié)構(gòu)加固方法研究成果的基礎(chǔ)上,以某特大橋?yàn)楣こ瘫尘?對(duì)既有鐵路橋梁的狀態(tài)檢測(cè)、承臺(tái)承載能力評(píng)定、加固方法及加固后的承載能力進(jìn)行了分析,主要研究?jī)?nèi)容如下:根據(jù)該實(shí)例工程的結(jié)構(gòu)及構(gòu)造特點(diǎn),對(duì)橋跨及橋墩進(jìn)行振動(dòng)測(cè)試,利用過(guò)路客、貨列車(chē),實(shí)測(cè)橋跨跨中的最大橫向振幅及最大橫、豎向加速度以及墩頂橫向振幅,了解橋梁結(jié)構(gòu)的工作狀態(tài)。在此基礎(chǔ)上,建立并調(diào)整midas FEA有限元模型,依據(jù)新舊規(guī)范規(guī)定,在不同荷載組合下,分析連續(xù)梁部分承臺(tái)承載力,并依據(jù)相關(guān)規(guī)范要求,綜合評(píng)價(jià)鐵路高樁承臺(tái)的承載能力。通過(guò)對(duì)15#~20#承臺(tái)承載力的分析,比較新舊規(guī)范關(guān)于抗震設(shè)防標(biāo)準(zhǔn)之間的差異。在總結(jié)橋梁常用的下部結(jié)構(gòu)加固方法的基礎(chǔ)上,針對(duì)橋梁下部結(jié)構(gòu)的實(shí)際特點(diǎn),對(duì)抗震能力不滿(mǎn)足相關(guān)規(guī)范要求的16#、17#承臺(tái)進(jìn)行加固處理。依據(jù)加固后結(jié)構(gòu)的特點(diǎn),重新建立有限元分析模型,以分析加固后16#、17#承臺(tái)在主力和地震作用下的承載能力,進(jìn)而評(píng)定承臺(tái)的加固效果以及加固后的承載能力。
[Abstract]:The jacket box is a temporary facility in the construction stage of the cap. Because of the large volume of the concrete jacket box and the large area of water blocking, the scour is aggravated in the main channel position. The damage of the lower part of the box and the further separation from the riverbed will increase the load on the pier. Under the action of river power, the casing is damaged and gradually sinking, askew, which will be the safety of direct bridge. Therefore, it is necessary to analyze the bearing capacity of railway high pile cap and reinforce it with appropriate scheme to meet the requirements of safety and durability of the bridge in the process of operation. On the basis of summing up the current research results on the load transfer mode of the cap, the assessment of the bearing capacity and the reinforcement method of the understructure of the bridge, this paper, taking a large bridge as the engineering background, tests the state of the existing railway bridge and evaluates the bearing capacity of the cap. The method of strengthening and the bearing capacity after reinforcement are analyzed. The main research contents are as follows: according to the structure and structural characteristics of the practical engineering, the vibration test of bridge span and pier is carried out, and the passengers and freight trains are used. The maximum transverse amplitude, the maximum transverse and vertical acceleration and the transverse amplitude at the top of the pier are measured in order to understand the working state of the bridge structure. On this basis, the midas FEA finite element model is established and adjusted. According to the new and old code, under different load combinations, the bearing capacity of part of continuous beam cap is analyzed, and the bearing capacity of railway high pile cap is comprehensively evaluated according to the requirements of relevant codes. Based on the analysis of the bearing capacity of the 15 #Li 20 # cap, the difference between the new and old codes on seismic fortification standards is compared. On the basis of summing up the common methods of strengthening the substructure of the bridge, according to the actual characteristics of the substructure of the bridge, the reinforcement treatment of the 16#17# cap which does not meet the requirements of the relevant code is carried out in the light of the actual characteristics of the substructure of the bridge. According to the characteristics of the reinforced structure, the finite element analysis model is established to analyze the bearing capacity of the reinforced 16#C17# cap under the main force and earthquake action, and then to evaluate the reinforcement effect and the bearing capacity of the strengthened cap.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U443.25;U445.72

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 侯林平;;現(xiàn)行橋梁檢測(cè)與加固的反思[J];交通科技;2007年01期

2 郭宏磊,丁大鈞,王元漢;厚承臺(tái)受力機(jī)理研究[J];鄭州大學(xué)學(xué)報(bào)(工學(xué)版);2004年01期

3 張彥玲,李運(yùn)生,王海龍;既有橋梁承載力評(píng)估方法研究[J];國(guó)防交通工程與技術(shù);2003年01期

4 于大濤,廖朝華;歐洲現(xiàn)有橋梁的評(píng)估[J];中外公路;2001年05期

5 高懷志,王君杰;橋梁檢測(cè)和狀態(tài)評(píng)估研究與應(yīng)用[J];世界地震工程;2000年02期

6 梁書(shū)亭,蔣永生,李傳殿;樁基承臺(tái)和筏板的空間桁架設(shè)計(jì)方法研究[J];東南大學(xué)學(xué)報(bào);1998年06期

7 郭宏磊,丁大鈞,蔣永生;厚承臺(tái)空間桁架受力機(jī)理的研究(2)[J];工業(yè)建筑;1997年09期

8 郭宏磊,丁大鈞,蔣永生;厚承臺(tái)空間桁架受力機(jī)理的研究(1)[J];工業(yè)建筑;1997年08期

9 魏克英;;國(guó)外舊橋技術(shù)改造情況介紹[J];國(guó)外公路;1984年02期

相關(guān)博士學(xué)位論文 前1條

1 孫成訪(fǎng);樁基厚承臺(tái)的試驗(yàn)研究與非線(xiàn)性分析[D];武漢理工大學(xué);2005年

相關(guān)碩士學(xué)位論文 前2條

1 劉麗妲;鐵路橋梁下部結(jié)構(gòu)承載力評(píng)估與加固技術(shù)研究[D];蘭州交通大學(xué);2015年

2 薛杰;大跨度橋梁結(jié)構(gòu)荷載試驗(yàn)效應(yīng)的分析與評(píng)定[D];華南理工大學(xué);2011年

，

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