發(fā)布時間：2018-05-30 00:41

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

【摘要】：傳統(tǒng)的普通混凝土箱梁橋具有整體性好，抗扭剛度大，結構動力特性優(yōu)越，施工方法多樣等優(yōu)點，特別適用于中等跨度的城市橋梁。雙層交通混凝土箱梁正是在保持傳統(tǒng)普通混凝土箱形梁應用基礎上的一種創(chuàng)新。它通過合理改善普通混凝土箱形梁結構形式，保證必要的凈空要求，取消箱內(nèi)常規(guī)設置的橫隔板，使其頂、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，在盡可能的保留著普通混凝土箱形截面構件的優(yōu)越性能的同時又能充分利用箱梁內(nèi)部結構空間，從而實現(xiàn)雙層交通。本文的主導思想主要是探索研究該種新型結構的橫向受力性能，通過在模型箱梁上進行不同荷載工況作用下的橫向受力性能試驗，對其在彈性階段的撓度變形、受力分配情況、頂、底板橫向應變分布規(guī)律等進行試驗研究，并采用大型有限元數(shù)值模擬分析軟件ANSYS對實際的試驗過程進行數(shù)值模擬分析，然后對有限元數(shù)值模擬分析結果和試驗結果加以分析對比，最終得到一些對雙層交通混凝土箱梁有意義的結論，從而為該實現(xiàn)雙層交通的新型混凝土結構體系的設計以及實際應用提供了參考依據(jù)。取得的主要研究成果如下： 1、荷載工況分上下加載在一道加勁環(huán)上時，跨中加勁環(huán)截面（4-4截面）的撓度值最大相差5%，開孔截面（3-3截面）的撓度值最大相差達到23%。荷載工況分上下加載在兩道加勁環(huán)上時，跨中加勁環(huán)截面（4-4截面）的撓度值最大相差7%，開孔截面（3-3截面）的撓度值最大相差12%。說明截面橫向加勁環(huán)的設置有效的提高了截面剛度，從而提高了梁的整體性，能有效減小荷載作用位置對模型箱梁整體撓度變形的影響。 2、在四種不同的荷載工況作用下，當荷載工況作用在底板時的箱梁撓度變形相比荷載工況作用在頂板時要大，其中以工況三即簡支梁跨中加勁環(huán)底板兩點對稱集中加載的撓度變形最大。 3、由于箱梁腹板大面積開孔，造成截面剛度被削弱，在工況一和工況三作用下，模型梁的縱向撓度變化曲線在2m處和6m處出現(xiàn)曲率突變現(xiàn)象。建議通過減小腹板開孔尺寸或增加截面加勁環(huán)數(shù)量的措施來提高箱梁截面剛度，，從而提高整體性。 4、該箱梁模型在五種不同荷載工況作用下，頂板的#1~#4號梁共分配了40%左右的荷載，底板的#5~#8號梁共分配了60%左右的荷載。 5、當荷載作用在4-4截面即跨中加勁環(huán)截面的頂板時，即工況一加載，4-4截面即跨中截面的頂板和底板的橫向應變分布規(guī)律基本一致，所測得的應變值大小也十分接近，最大值相差5%。當荷載作用在4-4截面即跨中加勁環(huán)截面的底板時，即工況三加載，頂板的橫向應變值相比底板明顯減小。且頂板與邊腹板交界處產(chǎn)生的橫向拉應力要明顯大于與中間腹板交界處產(chǎn)生的橫向拉應力。 6、當荷載作用在箱梁開孔段的截面頂板時，即工況二加載，由于腹板開孔影響內(nèi)力的傳遞，導致中室的頂板出現(xiàn)拉應力增大的現(xiàn)象。
[Abstract]:The traditional concrete box girder bridge has the advantages of good integrity, large torsion stiffness, superior dynamic characteristics and various construction methods. It is especially suitable for medium span urban bridges. The double deck concrete box girder is a kind of innovation on the basis of maintaining the traditional concrete box girder. The structure form of the concrete box girder ensures the necessary clearance requirements and cancels the conventional diaphragms in the box so that the top and the bottom plate are all the bridge deck system, and the necessary holes are opened on the web to meet the requirements of ventilation, lighting and fire protection, while the superior performance of the common concrete box section members can be retained as far as possible and can be filled at the same time. The main idea of this paper is to explore the lateral force performance of the new structure. Through the test of lateral force performance under different load conditions on the model box girder, the deflection and deformation, the load distribution, the top and the horizontal side of the floor are carried out in the elastic stage. The strain distribution law is studied, and the large finite element numerical simulation analysis software ANSYS is used to carry out numerical simulation analysis on the actual test process. Then, the numerical simulation analysis results and the experimental results are analyzed and compared. Finally, some conclusions are obtained for the double deck concrete box girder. The main achievements of the study are as follows:
1, the maximum deflection value of the cross section (4-4 section) is 5%, the maximum difference of deflection value of the cross section (3-3 section) of the open hole section (3-3 section) reaches the two stiffening ring of the 23%. load, and the maximum difference of the deflection value of the cross section (4-4 section) is 7%, and the opening section (3-3). The maximum difference of deflection value 12%. shows that the setting of cross section of cross section effectively improves the stiffness of cross section, thus improves the integrity of the beam, and can effectively reduce the effect of load position on the overall deflection and deformation of the model box girder.
2, under the action of four different load conditions, the deflection and deformation of the box girder when the loading condition is acting on the floor is larger than the loading condition, and the maximum deflection and deformation of the two point symmetrical concentrated load of the bottom plate of the simple supported beam is three.
3, because of the large area opening of the box girder web, the stiffness of the section is weakened. The curvature change of the longitudinal deflection curve of the model beam appears at 2m and 6m under the condition of working condition and working condition. It is suggested that the rigidity of the section of the box girder is improved by reducing the size of the opening of the web or increasing the number of the stiffening ring of the section, thus improving the integrity.
4, under the action of five different load conditions, the box beam model #1~#4 beam of the roof is distributed about 40% load, and the #5~#8 beam of the floor is assigned a total of about 60% load.
5, when the load is loaded on the top plate of the cross section of the 4-4 cross section, that is, the load of the working condition is loaded, the transverse strain distribution of the top plate and the bottom plate of the 4-4 cross section is basically the same, and the measured strain value is very close, the maximum difference is 5%. when the load is on the floor of the 4-4 cross section of the stiffening ring section. With three loading, the lateral strain of the roof decreases obviously compared with the bottom plate, and the transverse tensile stress at the junction of the top plate and the edge web is obviously larger than the transverse tensile stress produced at the junction of the middle web.
6, when the load is acted on the section roof of the opening section of the box beam, that is, the loading of the working condition two, as the open hole of the web affects the transmission of the internal force, the tension of the roof of the middle room is increased.
【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;U448.213

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