大跨度PC梁橋的靜動載試驗研究
發(fā)布時間：2018-10-13 11:07
【摘要】：大跨度PC連續(xù)梁橋是我國常用的橋型之一,大跨度PC連續(xù)梁橋的主要特點是變形和緩、伸縮率小、行車平穩(wěn),使得橋面伸縮縫設置少,這樣有利于高速行車。根據我國交通部頒布的《公路養(yǎng)護技術規(guī)范》要求,大跨度橋梁必須進行承載能力的鑒定。由于現階段的理論計算與橋梁實際情況往往存在一定的差距,所以進行承載能力的鑒定就離不開荷載試驗。目前,無論是現有橋梁還是新建橋梁都存在車輛-橋梁耦合振動問題,一方面,車輛在橋面上行駛會對橋梁結構產生動力沖擊作用,使得橋梁結構發(fā)生振動影響橋梁的正常運營狀況,另一方面,橋梁結構的振動反過來又作用于車輛,使得車輛行駛的平穩(wěn)性和舒適性受到影響,則對橋梁進行荷載試驗是必要的。橋梁荷載試驗是評價橋梁質量的最直接和有效的手段。進行橋梁荷載試驗不僅能夠驗證理論計算的合理性,同時還能夠促進理論計算和試驗理論的發(fā)展。本文針對大跨度PC連續(xù)梁橋的靜、動載試驗進行研究,以東風大橋為研究對象。研究該橋在靜、動載試驗下,影響應變、撓度的變化規(guī)律。利用大型通用有限元軟件MIDAS/Civil對東風大橋進行建模,輸入截面數據、邊界條件和各種荷載值。對橋梁靜載試驗的研究過程,分別計算東風大橋在設計荷載及試驗荷載作用下的控制截面的內力值,使得到荷載效率系數;計算各種工況下,各測點的應變及撓度理論值與現場實測值進行對比分析。對橋梁動載試驗的研究過程,對東風大橋模型進行模態(tài)分析,采用子空間迭代法計算特征值,得出橋梁的前幾階振型,從而得到固有頻率,根據相應規(guī)范計算得出沖擊系數值,模態(tài)分析得到的值與現場通過試驗儀器對跑車、跳車等試驗數據得出的橋梁振型、固有頻率和沖擊系數進行對比分析,并與相應的橋梁設計規(guī)范標準、荷載試驗的規(guī)范標準的容許值做對比;橋梁結構在靜、動載作用下的變形特性和動力特性正常,則說明橋梁的整體剛度良好,承載能力滿足設計要求,進一步驗證設計的合理性,對同類橋梁的承載能力進行分析提供了參考,也為將來的橋梁養(yǎng)護、維修和運營健康監(jiān)測系統(tǒng)提供寶貴的資料。
[Abstract]:The long-span PC continuous beam bridge is one of the commonly used bridges in China. The main characteristics of the long-span PC continuous beam bridge are gentle deformation, small expansion rate, steady driving, so that the bridge deck expansion joints are less, which is beneficial to high-speed driving. According to the requirements of the Technical Code for Highway maintenance issued by the Ministry of Communications of China, the bearing capacity of long-span bridges must be evaluated. Because there is a certain gap between the theoretical calculation and the actual situation of the bridge at the present stage, the identification of the bearing capacity can not be separated from the load test. At present, there exists the problem of vehicle-bridge coupling vibration in both existing and newly built bridges. On the one hand, the vehicle driving on the deck of the bridge will have a dynamic impact on the bridge structure. On the other hand, the vibration of the bridge structure acts on the vehicle in turn, which affects the ride stability and comfort of the vehicle, so that the vibration of the bridge structure affects the normal operation of the bridge, on the other hand, the vibration of the bridge structure acts on the vehicle in turn. It is necessary to carry out load test on the bridge. Bridge load test is the most direct and effective method to evaluate bridge quality. The bridge load test can not only verify the rationality of theoretical calculation, but also promote the development of theoretical calculation and test theory. In this paper, the static and dynamic load tests of long span PC continuous girder bridge are studied, and Dongfeng Bridge is taken as the research object. The variation law of strain and deflection of the bridge under static and dynamic load test is studied. The model of Dongfeng Bridge is modeled by MIDAS/Civil, and the cross section data, boundary conditions and load values are inputted. In the research process of bridge static load test, the internal forces of the control section of Dongfeng Bridge under design load and test load are calculated respectively, so that the load efficiency coefficient is obtained, and the load efficiency coefficient is calculated under various working conditions. The theoretical values of strain and deflection of each measuring point are compared with the field measured values. For the research process of bridge dynamic load test, the modal analysis of Dongfeng Bridge model is carried out, the eigenvalue is calculated by subspace iteration method, and the first several vibration modes of the bridge are obtained, and the natural frequency is obtained, and the impact coefficient value is calculated according to the corresponding specifications. The value obtained by modal analysis is compared with the bridge mode shape, natural frequency and impact coefficient obtained from the test data of sports car, jump and so on, and it is compared with the corresponding standard of bridge design code. The allowable values of the standard of load test are compared, and the deformation and dynamic characteristics of bridge structure under static and dynamic loads are normal, which indicates that the overall stiffness of the bridge is good, and the bearing capacity meets the design requirements. Furthermore, the rationality of the design is verified, the bearing capacity of the similar bridges is analyzed, and valuable data are provided for the bridge maintenance, maintenance and operation health monitoring system in the future.
【學位授予單位】：廣州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U446.1
本文編號：2268396
[Abstract]:The long-span PC continuous beam bridge is one of the commonly used bridges in China. The main characteristics of the long-span PC continuous beam bridge are gentle deformation, small expansion rate, steady driving, so that the bridge deck expansion joints are less, which is beneficial to high-speed driving. According to the requirements of the Technical Code for Highway maintenance issued by the Ministry of Communications of China, the bearing capacity of long-span bridges must be evaluated. Because there is a certain gap between the theoretical calculation and the actual situation of the bridge at the present stage, the identification of the bearing capacity can not be separated from the load test. At present, there exists the problem of vehicle-bridge coupling vibration in both existing and newly built bridges. On the one hand, the vehicle driving on the deck of the bridge will have a dynamic impact on the bridge structure. On the other hand, the vibration of the bridge structure acts on the vehicle in turn, which affects the ride stability and comfort of the vehicle, so that the vibration of the bridge structure affects the normal operation of the bridge, on the other hand, the vibration of the bridge structure acts on the vehicle in turn. It is necessary to carry out load test on the bridge. Bridge load test is the most direct and effective method to evaluate bridge quality. The bridge load test can not only verify the rationality of theoretical calculation, but also promote the development of theoretical calculation and test theory. In this paper, the static and dynamic load tests of long span PC continuous girder bridge are studied, and Dongfeng Bridge is taken as the research object. The variation law of strain and deflection of the bridge under static and dynamic load test is studied. The model of Dongfeng Bridge is modeled by MIDAS/Civil, and the cross section data, boundary conditions and load values are inputted. In the research process of bridge static load test, the internal forces of the control section of Dongfeng Bridge under design load and test load are calculated respectively, so that the load efficiency coefficient is obtained, and the load efficiency coefficient is calculated under various working conditions. The theoretical values of strain and deflection of each measuring point are compared with the field measured values. For the research process of bridge dynamic load test, the modal analysis of Dongfeng Bridge model is carried out, the eigenvalue is calculated by subspace iteration method, and the first several vibration modes of the bridge are obtained, and the natural frequency is obtained, and the impact coefficient value is calculated according to the corresponding specifications. The value obtained by modal analysis is compared with the bridge mode shape, natural frequency and impact coefficient obtained from the test data of sports car, jump and so on, and it is compared with the corresponding standard of bridge design code. The allowable values of the standard of load test are compared, and the deformation and dynamic characteristics of bridge structure under static and dynamic loads are normal, which indicates that the overall stiffness of the bridge is good, and the bearing capacity meets the design requirements. Furthermore, the rationality of the design is verified, the bearing capacity of the similar bridges is analyzed, and valuable data are provided for the bridge maintenance, maintenance and operation health monitoring system in the future.
【學位授予單位】：廣州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U446.1
【參考文獻】
相關期刊論文 前10條
1 陳上有;夏禾;戰(zhàn)家旺;顧戌華;;變速移動荷載作用下簡支梁的動力響應分析[J];中國鐵道科學;2007年06期
2 肖玉德;;蕪湖彎石公路清弋江橋動荷載試驗研究[J];城市道橋與防洪;2007年06期
3 華強;賀國京;鄒中權;;大跨度橋梁荷載試驗[J];山西建筑;2007年05期
4 劉長軍;;移動車輛對橋梁動力作用模擬簡化方法的研究[J];山西建筑;2007年04期
5 陳榕峰;宋丹;高鵬;;公路橋梁荷載試驗綜述[J];交通標準化;2006年10期
6 胡志堅;賈麗君;肖汝誠;袁帥華;;既有橋梁技術狀態(tài)評估研究現狀與展望[J];國防交通工程與技術;2006年02期
7 章日凱;王常青;;橋梁荷載試驗[J];交通標準化;2005年12期
8 王解軍,張偉,吳衛(wèi)祥;重型汽車荷載作用下簡支梁橋的動力反應分析[J];中南公路工程;2005年02期
9 劉思孟,劉國金,周建庭;基于內力控制兼顧撓度荷載效率的橋梁荷載試驗布載方法研究[J];重慶交通學院學報;2005年01期
10 楊春俠,楊偉軍,張建仁;基于驗證荷載法的橋梁荷載試驗失效風險分析[J];長沙交通學院學報;2004年02期
相關碩士學位論文 前1條
1 彭翠玲;簡支轉預應力連續(xù)梁橋分析與試驗研究[D];武漢理工大學;2003年
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