本文選題：橋梁工程　切入點：剛構(gòu)橋-連續(xù)梁組合體系橋梁　出處：《長安大學》2014年碩士論文　論文類型：學位論文

【摘要】：預(yù)應(yīng)力混凝土（PC）剛構(gòu)-連續(xù)梁組合體系橋梁綜合了連續(xù)剛構(gòu)橋和連續(xù)梁橋的優(yōu)點，在力學性能、使用功能和地形適應(yīng)性方面具有一定的優(yōu)越性，特別適合西部山區(qū)地質(zhì)和地形條件，是跨越復雜地質(zhì)條件、深溝、陡坡路段的首選橋型之一。為進一步推廣和應(yīng)用此類新型橋梁結(jié)，需要詳細掌握此類新型橋梁結(jié)構(gòu)的力學特性和地震響應(yīng)特點，因此開展預(yù)應(yīng)力混凝土剛構(gòu)-連續(xù)梁組合體系橋梁的力學特性分析和地震響應(yīng)方面的研究具有重要的工程應(yīng)用價值和美好前景。 本文以某庫區(qū)對外交通橋為工程實例，開展預(yù)應(yīng)力混凝土剛構(gòu)-連續(xù)梁組合體系橋梁的力學特性和地震響應(yīng)分析方面的研究工作，研究的主要內(nèi)容有： （1）運用Midas/civil有限元軟件建立了某庫區(qū)對外交通橋的有限元計算模型，并結(jié)合橋梁的實際材料特性、邊界條件和以往同類橋梁建模的注意事項對有限元計算模型進行適當?shù)男拚�，并根�?jù)交通橋設(shè)計的施工圖紙進行施工階段的劃分和模擬，為后續(xù)結(jié)構(gòu)力學特性分析和地震響應(yīng)分析奠定堅實的基礎(chǔ)。 （2）運用建立的精細有限元模型進行庫區(qū)交通橋結(jié)構(gòu)靜力力學特性和結(jié)構(gòu)動力特性的計算分析，主要研究在承載能力極限狀態(tài)不同荷載組合下橋梁結(jié)構(gòu)的安全性能；進行正常使用極限狀態(tài)不同荷載組合下結(jié)構(gòu)正截面抗裂驗算、斜截面抗裂驗算和結(jié)構(gòu)剛度驗算；進行持久狀況結(jié)構(gòu)應(yīng)力的驗算，考慮了不同荷載組合下結(jié)構(gòu)的正截面法向應(yīng)力的驗算和斜截面法向應(yīng)力的驗算；針對庫區(qū)交通橋的施工階段分析和現(xiàn)行橋梁設(shè)計規(guī)范，給出庫區(qū)交通橋的施工預(yù)拱度設(shè)置與分配情況；采用適合求解大型特征值問題的lanczos法進行庫區(qū)交通橋自由振動特性的分析，為后續(xù)庫區(qū)交通橋地震響應(yīng)分析奠定基礎(chǔ)。 （3）在總結(jié)已有關(guān)于地震響應(yīng)研究成果的基礎(chǔ)上，，運用反應(yīng)譜分析法和動力時程分析法進行庫區(qū)交通橋的地震響應(yīng)分析，反應(yīng)譜法考慮兩種地震E1地震和E2地震兩種情況，動力時程分析法以典型強震記錄波EL-Centro為基礎(chǔ)并根據(jù)庫區(qū)交通橋的實際情況進行適當調(diào)整；根據(jù)計算結(jié)果研究在不同荷載組合下橋墩和主梁的內(nèi)力和位移變化情況，以了解庫區(qū)交通橋的地震響應(yīng)特點，并進行應(yīng)譜分析法和動力時程分析法計算結(jié)果的比較分析，校核與驗證兩種計算方法的計算結(jié)果的正確性，確保為結(jié)構(gòu)的抗震設(shè)計提供相對可靠的計算依據(jù)。
[Abstract]:Prestressed concrete (PC) rigid frame-continuous beam composite system bridge integrates the advantages of continuous rigid frame bridge and continuous beam bridge, and has some advantages in mechanical performance, use function and terrain adaptability. It is especially suitable for geological and topographic conditions in western mountainous areas, and is one of the preferred bridge types for crossing complex geological conditions, deep ditches and steep slope sections. It is necessary to master the mechanical characteristics and seismic response characteristics of this new type of bridge structure in detail. Therefore, the analysis of mechanical characteristics and seismic response of prestressed concrete rigid frame-continuous beam composite bridge has important engineering application value and bright prospect. Taking an external traffic bridge in a reservoir area as an engineering example, this paper studies the mechanical characteristics and seismic response of prestressed concrete rigid frame-continuous beam composite bridge. The main contents of the study are as follows:. 1) the finite element calculation model of an external traffic bridge in a reservoir area is established by using Midas/civil finite element software. Combining with the actual material characteristics of the bridge, the boundary conditions and the matters needing attention in the modeling of the same bridge in the past, the finite element calculation model is modified appropriately. According to the construction drawing of the traffic bridge design, the construction stage is divided and simulated, which lays a solid foundation for the subsequent structural mechanical characteristics analysis and seismic response analysis. 2) the fine finite element model is used to calculate and analyze the static and dynamic characteristics of the traffic bridge structure in the reservoir area, and the safety performance of the bridge structure under different load combinations under the limit state of bearing capacity is mainly studied. The crack resistance of normal section, the crack resistance of oblique section and the stiffness of structure under different load combinations under normal service limit state are calculated, and the structural stress of the lasting condition is checked. The normal stress of normal section and normal stress of inclined section under different load combinations are considered, and the analysis of construction stage of traffic bridge in reservoir area and the current design code of bridge are discussed. The construction pre-arch setting and distribution of traffic bridges in the reservoir area are given, and the lanczos method suitable for solving large eigenvalue problems is used to analyze the free vibration characteristics of the traffic bridges in the reservoir area, which lays a foundation for the seismic response analysis of the traffic bridges in the subsequent reservoir area. 3) on the basis of summarizing the existing research results on seismic response, the response spectrum analysis and dynamic time-history analysis are used to analyze the seismic response of traffic bridges in the reservoir area. The response spectrum method considers two kinds of earthquakes, E1 earthquake and E2 earthquake. The dynamic time-history analysis method is based on the typical strong earthquake recording wave EL-Centro and is adjusted appropriately according to the actual situation of the traffic bridge in the reservoir area. According to the calculation results, the variation of the internal force and displacement of the pier and the main beam under different load combinations are studied. In order to understand the characteristics of seismic response of traffic bridges in the reservoir area, and to compare and analyze the calculated results of the corresponding spectrum analysis method and the dynamic time history analysis method, the correctness of the calculation results of the two calculation methods is checked and verified. To ensure that the seismic design of the structure to provide a relatively reliable basis for calculation.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55

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