超寬箱梁多種支承條件下橫梁結(jié)構(gòu)受力研究
本文關(guān)鍵詞: 超寬箱梁 空間受力 梁格法 有效寬度 出處:《東南大學(xué)》2015年碩士論文 論文類型:學(xué)位論文
【摘要】:隨著我國城市交通建設(shè)事業(yè)的發(fā)展,城市橋梁的修建數(shù)量日益增加,對橋型、構(gòu)造都提出了新的要求,超寬箱梁應(yīng)運而生。超寬箱梁因其橫向扭轉(zhuǎn)剛度較大、施工工藝簡單等優(yōu)點而倍受青睞。橫梁是橋梁結(jié)構(gòu)的重要構(gòu)件,由于超寬箱梁截面寬度大,使得橫梁受力更趨復(fù)雜。實際工程中,常需對其結(jié)構(gòu)簡化形式的可靠性與安全性進(jìn)行研究驗證,從而延長了設(shè)計工作周期,降低了工作效率。本文以某實際工程項目為依托,對橫梁簡化模型進(jìn)行研究分析。首先對目前國內(nèi)外的寬箱梁橋橫梁受力研究成果進(jìn)行總結(jié),并介紹有限元分析方法和單元計算的一般規(guī)定。其次,以南京市緯七路西延建設(shè)工程中的M20聯(lián)三跨預(yù)應(yīng)力混凝土連續(xù)超寬箱梁結(jié)構(gòu)為背景,分別采用梁格法與實體有限元軟件對其進(jìn)行受力分析,得到橋梁整體結(jié)構(gòu)及橫梁構(gòu)件的受力情況,并對橫梁結(jié)構(gòu)簡化模型及其計算結(jié)果進(jìn)行了驗證。得出了以下主要結(jié)論:(1)超寬箱梁結(jié)構(gòu)空間效應(yīng)顯著。(2)橫梁的支承情況對其撓度影響顯著:支座間距較大時,橫梁撓度與簡支梁撓度分布規(guī)律相似,支座間距較小時,橫梁撓度與懸臂梁撓度分布規(guī)律相似。(3)橫梁的受力并不是由頂?shù)装寮案拱寰鶆蚍謸?dān),而是外腹板分擔(dān)的荷載較小,內(nèi)部腹板分擔(dān)的荷載受支座間距影響較大。(4)對預(yù)應(yīng)力混凝土連續(xù)箱梁結(jié)構(gòu)雙支座及多支座的橫梁內(nèi)力由橫梁及兩側(cè)頂?shù)装骞餐袚?dān),表明橫梁簡化模型取用6倍的頂、底板厚度作為有效寬度,具有切實的實用性。(5)支承處的恒載及活載簡化滿足工程要求。
[Abstract]:With the development of urban traffic construction in our country, the number of urban bridges is increasing day by day. New requirements are put forward for bridge type and structure. Ultra-wide box girder emerges as the times require. The cross beam is an important component of the bridge structure. Because of the wide cross-section width of the box girder, the force of the cross beam becomes more complicated. It is often necessary to study and verify the reliability and safety of the simplified structure, thus prolonging the design cycle and reducing the working efficiency. The simplified model of cross beam is studied and analyzed. Firstly, the research results of beam force of wide box girder bridge at home and abroad are summarized, and the finite element analysis method and the general rules of element calculation are introduced. Based on the M20 three-span prestressed concrete continuous ultra-wide box girder structure in the west extension of Weiqi Road, Nanjing City, the force analysis is carried out by using the beam lattice method and the entity finite element software, respectively. The stress condition of the whole bridge structure and the cross beam member is obtained. The simplified model of cross beam structure and its calculation results are verified. The main conclusions are as follows: 1) the spatial effect of super wide box girder structure is significant. The deflection of the beam is similar to that of the simply supported beam, and the deflection of the beam is similar to that of the cantilever beam when the support spacing is small.) the force on the beam is not uniformly shared by the top and bottom plates and the web plate, but the load on the outer web plate is smaller. The load shared by the internal web plate is greatly affected by the support spacing. 4) the internal force of the prestressed concrete continuous box girder structure with double and multiple supports is shared by the cross beam and the top and bottom plates of both sides, which indicates that the simplified model of the cross beam adopts the top of 6 times. As the effective width, the thickness of the bottom plate has practical practicability. 5) the dead load and live load simplification at the support meet the engineering requirements.
【學(xué)位授予單位】:東南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:U441
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