鋼桁梁柔性拱組合體系橋節(jié)點板受力性能分析與試驗研究
發(fā)布時間：2018-10-30 21:05
【摘要】：廈深客運專線榕江特大橋系主跨為(110+220+220+110m)的下承式鋼桁梁柔性拱組合體系橋,其跨度在同類型橋梁中位居世界首位。該橋的節(jié)點構(gòu)造形式采用了整體式節(jié)點技術(shù),其中部分節(jié)點相交桿件多、結(jié)構(gòu)和受力復(fù)雜,本文結(jié)合原鐵道部科技研究開發(fā)計劃項目《高速鐵路橋梁技術(shù)深化研究-大跨度連續(xù)鋼桁梁柔性拱組合關(guān)鍵技術(shù)研究》(合同號2010G004-A)要求,以廈深高鐵榕江特大橋為工程背景,以該橋E11節(jié)點整體節(jié)點板為研究對象,開展其受力性能和成橋試驗研究,本文主要做了以下工作： 1.分別建立了榕江特大橋E11節(jié)點整體節(jié)點板的節(jié)段模型和多尺度模型,基于兩種模型對整體節(jié)點板進行受力分析,得到了較為一致的結(jié)果。 2.通過對比力邊界節(jié)段模型、位移邊界節(jié)段模型和多尺度模型計算結(jié)果的差異性和規(guī)律性,揭示了節(jié)點剛度的影響規(guī)律：在節(jié)點區(qū)域內(nèi)多尺度模型的剛度要比梁單元模型大得多,梁單元模型的節(jié)點剛度偏小。進一步分析了這一剛度差異對節(jié)段模型計算結(jié)果的影響,并指出基于多尺度模型的節(jié)點剛度更接近真實狀態(tài)、多尺度模型的計算結(jié)果更加精確。 3.為探索整體節(jié)點剛度及其模擬方法對桁架桿件內(nèi)力的影響,采用多尺度模型、剛臂梁單元模型和梁單元模型3種模擬方法開展分析。計算結(jié)果：隨著節(jié)點剛度的增加,桿件軸力變化不大,部分桿件軸力有略微減小,而剪力和彎矩變化較大,且基本呈增大趨勢,其中以直腹桿的增幅最為顯著,也導(dǎo)致彎矩次應(yīng)力在直腹桿中的增幅較顯著。同時研究了在對桁架桿件進行受力分析時,剛臂梁單元法的適用性問題,發(fā)現(xiàn)其計算結(jié)果較多尺度模型存在一定差異率,精度不高,但結(jié)果均偏于安全,且該方法建模簡便,計算快捷,在對結(jié)構(gòu)較復(fù)雜、節(jié)點整體性較強、剛度較大的桁架結(jié)構(gòu),分析桿件受力時可以考慮該方法。 4.在該橋梁的成橋試驗中,選取E11節(jié)點整體節(jié)點板進行了靜力試驗,完成了試驗測點布置、數(shù)據(jù)采集和數(shù)據(jù)分析,理論和試驗結(jié)果一方面驗證了該節(jié)點板設(shè)計結(jié)構(gòu)的安全性,另一方面驗證了本文中“多尺度模型比節(jié)段模型精度更高”等的分析結(jié)論。 本文對整體式節(jié)點的分析方法、試驗手段和分析結(jié)論可供同類結(jié)構(gòu)設(shè)計和計算時參考。
[Abstract]:The through steel truss beam flexible arch composite bridge with main span of 110 220 220 110m is the main span of Rongjiang super bridge in Xiamen and Shenzhen passenger dedicated line. Its span ranks first in the world in the same type of bridge. The joint structure of the bridge adopts integral joint technology, in which some of the joints have many intersecting members, and the structure and force are complex. In this paper, according to the project of the original Ministry of Railways Science and Technology Research and Development Project < High Speed Railway Bridge Technology deepening Research-Research on key Technology of large Span continuous Steel Truss girder flexible Arch combination "(contract No. 2010G004-A), Taking Rongjiang River Bridge of Xia-Shenzhen high-speed railway as the engineering background and taking the integral plate of the E11 node of the bridge as the research object, the experimental research on its mechanical performance and bridge completion is carried out. The main work of this paper is as follows: 1. The segmental model and the multi-scale model of the integral plate of the E11 node of Rongjiang Bridge are established respectively. Based on the two models, the stress of the whole plate is analyzed, and the results are consistent. 2. By comparing the force boundary segment model, the displacement boundary segment model and the multi-scale model, the difference and regularity of the calculation results are revealed, and the influence law of the node stiffness is revealed: the stiffness of the multi-scale model is much larger than that of the beam element model in the joint region. The joint stiffness of the beam element model is small. Furthermore, the effect of this stiffness difference on the results of the segmental model is analyzed, and it is pointed out that the node stiffness based on the multi-scale model is closer to the real state and the calculation result of the multi-scale model is more accurate. 3. In order to explore the influence of the stiffness of the whole node and its simulation method on the internal force of truss member, the multi-scale model, the rigid arm beam element model and the beam element model were used to analyze the internal force of truss member. The results show that with the increase of joint stiffness, the axial force of the member does not change much, while the axial force of some members decreases slightly, while the shear force and bending moment change greatly, and the increase of the straight web bar is the most significant. It also leads to a significant increase in the secondary stress of bending moment in the straight web bar. At the same time, the applicability of the rigid-arm beam element method is studied when the truss member is subjected to force analysis. It is found that there are some differences in the calculation results and the accuracy is not high, but the results are more safety and the method is simple and convenient. This method can be taken into account in the analysis of truss structures with complex structure, strong integrity of joints and large stiffness. 4. In the bridge test of the bridge, the static test is carried out by selecting the E11 node integral joint plate, and the layout of test points, data collection and data analysis are completed. On the one hand, the theory and test results verify the safety of the design structure of the joint plate. On the other hand, it verifies the conclusion that the multi-scale model is more accurate than the segmental model. In this paper, the analytical methods, test methods and conclusions of integral joints can be used for reference in the design and calculation of similar structures.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441
本文編號：2301183
[Abstract]:The through steel truss beam flexible arch composite bridge with main span of 110 220 220 110m is the main span of Rongjiang super bridge in Xiamen and Shenzhen passenger dedicated line. Its span ranks first in the world in the same type of bridge. The joint structure of the bridge adopts integral joint technology, in which some of the joints have many intersecting members, and the structure and force are complex. In this paper, according to the project of the original Ministry of Railways Science and Technology Research and Development Project < High Speed Railway Bridge Technology deepening Research-Research on key Technology of large Span continuous Steel Truss girder flexible Arch combination "(contract No. 2010G004-A), Taking Rongjiang River Bridge of Xia-Shenzhen high-speed railway as the engineering background and taking the integral plate of the E11 node of the bridge as the research object, the experimental research on its mechanical performance and bridge completion is carried out. The main work of this paper is as follows: 1. The segmental model and the multi-scale model of the integral plate of the E11 node of Rongjiang Bridge are established respectively. Based on the two models, the stress of the whole plate is analyzed, and the results are consistent. 2. By comparing the force boundary segment model, the displacement boundary segment model and the multi-scale model, the difference and regularity of the calculation results are revealed, and the influence law of the node stiffness is revealed: the stiffness of the multi-scale model is much larger than that of the beam element model in the joint region. The joint stiffness of the beam element model is small. Furthermore, the effect of this stiffness difference on the results of the segmental model is analyzed, and it is pointed out that the node stiffness based on the multi-scale model is closer to the real state and the calculation result of the multi-scale model is more accurate. 3. In order to explore the influence of the stiffness of the whole node and its simulation method on the internal force of truss member, the multi-scale model, the rigid arm beam element model and the beam element model were used to analyze the internal force of truss member. The results show that with the increase of joint stiffness, the axial force of the member does not change much, while the axial force of some members decreases slightly, while the shear force and bending moment change greatly, and the increase of the straight web bar is the most significant. It also leads to a significant increase in the secondary stress of bending moment in the straight web bar. At the same time, the applicability of the rigid-arm beam element method is studied when the truss member is subjected to force analysis. It is found that there are some differences in the calculation results and the accuracy is not high, but the results are more safety and the method is simple and convenient. This method can be taken into account in the analysis of truss structures with complex structure, strong integrity of joints and large stiffness. 4. In the bridge test of the bridge, the static test is carried out by selecting the E11 node integral joint plate, and the layout of test points, data collection and data analysis are completed. On the one hand, the theory and test results verify the safety of the design structure of the joint plate. On the other hand, it verifies the conclusion that the multi-scale model is more accurate than the segmental model. In this paper, the analytical methods, test methods and conclusions of integral joints can be used for reference in the design and calculation of similar structures.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441
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