本文選題：波形鋼腹板 + 分條分塊預制組拼　； 參考：《華東交通大學》2017年碩士論文

【摘要】：頂推施工作為一種相對成熟的施工工藝,在預應力混凝土梁橋以及鋼箱梁的架設中得到了較為廣泛的應用。波形鋼腹板組合箱梁作為一種新型鋼混組合結構,目前在國內(nèi)外已修建100余座。雖然橋型的選擇和施工的方法很多,但頂推施工在此類梁橋中的應用卻并不常見,相應的研究也較為薄弱。為此,本文以井山經(jīng)濟技術開發(fā)區(qū)深圳大橋為例,設計了波形鋼腹板PC組合小箱梁,提出組合小箱梁分條分塊預制組拼頂推施工方案,分別運用大型有限元軟件Midas/Civil和ANSYS開展了頂推施工全過程和主梁頂推施工局部應力分析,相應的研究成果可為同類橋梁的設計和施工提供參考。本文主要完成了以下幾方面的工作:(1)綜述了頂推施工的發(fā)展歷程、受力特點及在各種橋型上的運用情況;介紹了波形鋼腹板組合梁橋的特點、優(yōu)勢以及國內(nèi)外的發(fā)展概況,總結了波形鋼腹板運用頂推法施工的優(yōu)勢以及特點。(2)以井岡山經(jīng)濟技術開發(fā)區(qū)深圳大橋為例,通過引入波形鋼腹板和Φ21.8大直徑預應力束,設計了波形鋼腹板小箱梁,提出了波形鋼腹板箱梁預制組拼頂推的施工方案,實現(xiàn)了梁橋上部結構和下部結構的同時施工,大大提高頂推施工速度,縮短施工工期。(3)運用大型有限元Midas/Civil軟件建立頂推施工全過程分析模型,探討了頂推施工中主梁受力、導梁撓度變化以及使用過程中結構安全性能。頂推施工模擬表明,主梁頂、底板在頂推過程中均有一定的壓應力安全貯備,最大壓應力出現(xiàn)在底板,其值為19.84MPa,腹板最大剪應力為79.23MPa,均滿足規(guī)范要求;導梁最大撓度值為172.18mm,約為頂推長度(49m)的1/285,施工中應采取相應措施確保導梁安全通過臨時墩。成橋整體受力分析表明,主梁頂、底板均有一定的壓應力安全貯備,且最大壓應力為16.6MPa,腹板剪應力最大為113.21MPa,均滿足規(guī)范要求。(4)應用有限元法對頂推施工過程中導梁剛度、自重以及臨時墩位置進行優(yōu)化分析,結果表明導梁重量相對于導梁剛度主梁受力更敏感,在滿足導梁剛度的情況下,應盡量減輕導梁的重量。此外,臨時墩位置能有效減少主梁內(nèi)力峰值以及導梁前端撓度峰值,在條件允許的情況下,臨時墩應盡量設置在跨中位置。(5)借助有限元程序ANSYS建立波形鋼腹板小箱梁全橋有限元模型,選取主梁出現(xiàn)最大負彎距以及最大正彎矩工況進行局部應力分析,結果表明箱梁頂、底板均保持較好的壓應力水平,且最大壓應力為21.6MPa,波形鋼腹板最大剪應力為82.5MPa,均滿足規(guī)范要求。
[Abstract]:As a relatively mature construction technology, push-push construction has been widely used in the erection of prestressed concrete beam bridges and steel box girders. As a new type of steel-concrete composite structure, more than 100 composite box girders have been built at home and abroad. Although there are many methods of bridge selection and construction, the application of push-push construction in this kind of girder bridge is not common, and the corresponding research is relatively weak. Therefore, taking the Shenzhen Bridge of Jingshan Economic and technological Development Zone as an example, this paper designs PC composite small box girder with corrugated steel webs, and puts forward the construction scheme of prefabricated assembly and pushing construction of composite small box girder in strips and blocks. The whole process of the jacking construction and the local stress analysis of the main beam pushing construction are carried out by using the large-scale finite element software Midas / Civil and ANSYS respectively. The corresponding research results can provide a reference for the design and construction of the similar bridges. The main work of this paper is as follows: (1) the development course, force characteristics and application in various bridge types of jacking construction are summarized, and the characteristics, advantages and development situation at home and abroad of composite girder bridge with corrugated steel webs are introduced. The advantages and characteristics of waveform steel web construction by pushing method are summarized. (2) taking the Shenzhen Bridge in Jinggangshan Economic and technological Development Zone as an example, the small box girder with waveform steel web and 桅 21.8 large diameter prestressed beam is designed. The construction scheme of precast box girder with corrugated steel webs is put forward, which realizes the construction of the superstructure and the substructure of the beam bridge at the same time, and greatly improves the speed of the jacking construction. (3) using Midas / Civil software of large finite element to establish the whole process analysis model of jacking construction, and discussing the force of main beam, deflection change of guide beam and safety performance of structure in the process of using. The simulation of jacking construction shows that the top and bottom of the main beam have some safe storage of compressive stress, the maximum compressive stress appears in the bottom plate, its value is 19.84 MPA, and the maximum shear stress of web plate is 79.23 MPA, which all meet the requirements of the code. The maximum deflection of the guide beam is 172.18mm, which is about 1 / 285of the thrust length (49m). The corresponding measures should be taken in the construction to ensure the safety of the guide beam passing through the temporary pier. The analysis of the whole force of the bridge shows that the top and bottom of the main beam have a certain amount of safe storage of compressive stress, and the maximum compressive stress is 16.6 MPA, and the maximum shear stress of web plate is 113.21 MPa, which all meet the requirements of the code. (4) the stiffness of the guide beam in the process of jacking construction is satisfied with the finite element method, and the maximum compressive stress is 16.6 MPA and 113.21 MPa respectively. The results show that the weight of the guide beam is more sensitive than that of the main beam with the stiffness of the guide beam, and the weight of the guide beam should be reduced when the stiffness of the guide beam is satisfied. In addition, the position of temporary piers can effectively reduce the peak internal force of the main beam and the peak deflection of the front end of the guide beam. The temporary piers should be located in the middle of span as far as possible. (5) the finite element model of the whole bridge with corrugated steel web small box girder is established with the help of finite element program ANSYS. The maximum negative bending distance and the maximum positive bending moment of the main girder are selected for local stress analysis, and the results show that the box girder top is the top of the box girder. The maximum compressive stress of bottom plate is 21.6 MPA and the maximum shear stress of corrugated steel web is 82.5 MPA.
【學位授予單位】：華東交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.462

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