本文選題：雙層交通 + 簡支箱梁��； 參考：《湖南科技大學》2014年碩士論文

【摘要】：混凝土箱梁因具良好受力性能而特別適用于中等跨度城市橋梁。通過取消箱梁橫隔板，使頂、底板均成為橋面系，同時在腹板上開設必要的孔洞以滿足通風、采光及消防等要求，可實現(xiàn)雙層交通。該設計方法對解決城市交通擁擠問題具有重要現(xiàn)實意義。本文基于國家自然科學基金資助項目“面向雙層交通混凝土箱形梁受力機理及設計方法研究”（項目批準號：51378202）展開相關研究。以1:6比例設計了腹板開孔混凝土箱梁，對其在雙層集中荷載作用下抗彎受力性能進行系統(tǒng)試驗研究和理論分析，得出的主要結(jié)論如下： （1）對雙層集中荷載作用下腹板開孔混凝土簡支箱梁在彈性范圍內(nèi)的抗彎受力性能進行了大比例模型試驗研究，并就腹板開孔與否對其受力性能影響進行了有限元分析，研究成果可為混凝土箱梁雙層橋相關設計提供參考。 （2）對于底板邊梁而言，荷載作用在頂板邊梁（工況一）時底板邊梁跨中撓度為0.29mm，荷載作用于底板邊梁（工況三）時為0.32mm，較工況一而言增大10.3%；對于底板中梁而言，荷載作用在頂板中梁（工況二）時底板中梁3/8跨處產(chǎn)生的撓度是0.27mm，荷載作用于底板中梁（工況四）時為0.31mm，較工況二而言增大了14.8%，說明底板加載對腹板開孔簡支箱梁的中梁撓度影響較大。 （3）就腹板開孔與否對雙層集中荷載作用簡支箱梁抗彎受力性能的影響進行了有限元分析。分析結(jié)果表明：以底板邊梁為例，工況一~工況四作用下，，不開孔梁的跨中撓度分別為0.26mm、0.22mm、0.08mm、0.04mm；開孔梁對應的撓度值分別為0.30mm、0.24mm、0.33mm、0.20mm，較不開孔箱梁而言，開孔箱梁跨中撓度分別增大了1.2倍、1.1倍、3倍和4倍。相對于不開孔梁而言，工況一和工況二（均為頂板加載）加載對開孔梁加載其跨中撓度增大1.15倍，工況三和工況四（均為底板加載）加載對開孔梁加載其跨中撓度增大3.5倍，底板加載對開孔梁的撓度有較大影響。 （4）對于不開孔梁而言，工況一作用下1-1截面頂板和底板的剪力滯系數(shù)變化范圍分別為0.71~1.32和0.82~1.25，2-2截面對應的數(shù)值分別為0.89~1.09和0.93~1.06；對于開孔梁而言，工況一作用下1-1截面頂板和底板的剪力滯系數(shù)變化范圍分別為0.69~1.36和0.73~1.26，2-2截面對應的數(shù)值分別為0.56~1.46和0.89~1.07。開孔梁在各工況作用下截面剪力滯系數(shù)增大，最大增大量值達33.9%。因此，腹板開孔對承受雙層荷載鋼筋混凝土簡支箱梁抗彎受力性能有較大影響。
[Abstract]:Concrete box girder is especially suitable for medium span city bridge because of its good mechanical performance. By canceling the transverse partition of the box girder, the top and bottom plates can become the bridge deck system, and at the same time opening the necessary holes in the web plate to meet the requirements of ventilation, lighting and fire protection, the double layer traffic can be realized. This design method has important practical significance to solve the problem of urban traffic congestion. This paper is based on the National Natural Science Foundation's project "study on the Force Mechanism and Design method of Double-Deck Traffic concrete Box Beams" (Project Grant No.: 513782022). The concrete box girder with web openings is designed at 1:6 scale. The bending behavior of the box girder subjected to double-layer concentrated load is systematically studied and analyzed theoretically. The main conclusions are as follows: In this paper, the flexural behavior of simply supported concrete box girder with web openings under the action of double layer concentrated load is studied in a large scale model test, and the finite element analysis is carried out on whether the web is perforated or not. The research results can provide reference for the related design of concrete box girder double-deck bridge. (2) for the side beam of the bottom slab, when the load acts on the side beam of the roof slab (working condition 1), the deflection of the center span of the side beam of the bottom slab is 0.29 mm, and the load acting on the side beam of the floor plate (working condition 3) is 0.32 mm, which is 10.3 mm larger than that of the working condition 1; for the middle beam of the bottom plate, The deflection of the 3 / 8 span of the beam in the bottom plate is 0.27 mm when the load is applied to the beam in the top plate (working condition 2) and 0.31 mm when the load acts on the beam in the bottom plate (working condition 4), which is 14. 8 mm larger than the second condition, which shows that the loading of the bottom plate can make a simple box with a web hole. The deflection of the middle beam has a great influence. 3) finite element analysis is carried out on the influence of web opening or not on the flexural behavior of simply supported box girder under double-layer concentrated load. The analysis results show that the mid-span deflection of the non-perforated beam is 0.26mm / 0.22mm / 0.08mm / 0.04mm, respectively, and the corresponding deflection of the open-hole beam is 0.30mm / 0.24mm / 0.33mm / 0.20mm respectively, which is more than that of the box girder without opening hole, taking the side beam of the bottom plate as an example, and under the action of one to four working conditions, the mid-span deflection of the non-perforated beam is 0.26mm / 0.22mm / 0.08mm / 0.04mm, respectively. The midspan deflection of open box girder is increased by 1.2 times, 1.1 times and 4 times, respectively. Compared with the non-perforated beam, the mid-span deflection of the open-hole beam is increased by 1.15 times under the loading of working conditions 1 and 2 (both roof loading), and 3.5 times by the loading of working conditions 3 and 4 (all of which are loaded by the bottom plate). The load of the bottom plate has great influence on the deflection of the beam. (4) for non-perforated beams, the shear lag coefficients of the top and bottom plates with 1-1 section under one working condition vary from 0.71 to 1.32 and from 0.82 to 1.25 / 2, respectively, and the corresponding values are 0.891.09 and 0.931.06, respectively, for open-hole beams. The variation range of shear lag coefficient of 1-1 cross-section roof and floor is 0.69 ~ 1.36 and 0.73 ~ (1.262-2) respectively. The corresponding values are 0.56 ~ 1.46 and 0.89 ~ 1.07, respectively. The shear lag coefficient of the cross-section increases and the maximum increase value reaches 33.9. Therefore, the web opening has great influence on the flexural behavior of reinforced concrete simply supported box girder under double deck load.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441;U448.217

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