【摘要】：箱型截面梁由于其承受正負彎矩能力強、抗扭剛度大、截面效率指標高、穩(wěn)定性好等顯著優(yōu)點，被廣泛用于橋梁結(jié)構(gòu)中。但又由于其薄壁、寬翼緣的結(jié)構(gòu)特征，導致箱型梁在荷載作用下產(chǎn)生扭轉(zhuǎn)、畸變、翹曲等不同于其它開口截面的受力特征，其中箱型梁翼緣的剪力滯效應問題更是不容忽視。產(chǎn)生剪力滯效應的結(jié)果是使箱梁翼緣上產(chǎn)生局部應力集中，如果在橋梁結(jié)構(gòu)的設計和施工過程中忽略這種效應，將會降低結(jié)構(gòu)的安全儲備，甚至導致結(jié)構(gòu)的破壞。因此本文結(jié)合依托工程，研究寬幅薄壁單箱六室箱型截面預應力混凝土梁斜拉橋的剪力滯效應，具有其實用的工程價值和理論研究意義。本文完成的主要工作有： （1）查閱了國內(nèi)外大量的參考文獻，綜述了目前剪力滯效應的研究現(xiàn)狀、研究理論與方法，并進行了對比分析，指出各種方法的局限性和適用場合，提出了現(xiàn)有的研究剪力滯理論需要改進的地方。最后說明本論文研究的意義和必要性。 （2）闡述了箱形梁的受力特點、薄壁箱形梁剪力滯后效應的概念。 （3）闡述了斜拉橋基本結(jié)構(gòu)體系及其特點。 （4）用MIDAS/Civil建立了依托工程的有限元模型，分別分析了漂浮體系、半漂浮體系、塔梁固結(jié)體系和剛構(gòu)體系四種斜拉橋結(jié)構(gòu)體系在典型施工階段和成橋荷載作用下一般截面（無橫隔板截面）和特殊截面（有橫隔板）的剪力滯效應，并進行了的對比分析。 分析結(jié)果表明，寬幅混凝土斜拉橋剪力滯效應較突出，，剪力滯系數(shù)沿縱向呈現(xiàn)明顯的分區(qū)現(xiàn)象。
[Abstract]:Box section beam is widely used in bridge structure because of its strong positive and negative bending moment, large torsional stiffness, high cross-section efficiency index and good stability. However, due to the structural characteristics of thin-walled and wide-flange, the box girder has torsion, distortion and warpage under load, which is different from other open section, and the shear lag effect of box girder flange can not be ignored. The result of shear lag effect is the local stress concentration on the flange of box girder. If this effect is ignored in the design and construction of bridge structure, the safety reserve of the structure will be reduced and even the structure will be destroyed. Therefore, it is of practical engineering value and theoretical significance to study the shear lag effect of prestressed concrete girder cable-stayed bridge with wide thin-walled single box and six-room box section in this paper. The main works of this paper are as follows: (1) A large number of references at home and abroad are reviewed, and the current research status, theories and methods of shear lag effect are summarized, and a comparative analysis is made. The limitations and applications of various methods are pointed out, and the existing research on shear lag theory is put forward. Finally, the significance and necessity of this paper are explained. (2) the stress characteristics of box beam and the concept of shear lag effect of thin wall box beam are expounded. (3) the basic structure system and its characteristics of cable-stayed bridge are expounded. (4) the finite element model of supporting engineering is established by MIDAS/Civil, and the floating system and semi-floating system are analyzed respectively. The shear lag effects of general section (without cross diaphragm section) and special section (with cross diaphragm section) of four cable-stayed bridge systems under typical construction stage and bridge load are analyzed and compared. The results show that the shear lag effect of wide-width concrete cable-stayed bridge is prominent and the shear lag coefficient appears obvious zoning phenomenon along the longitudinal direction.
【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】：U441;U448.27

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相關(guān)期刊論文 前3條

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3 羅旗幟;薄壁箱形梁剪力滯計算的梁段有限元法[J];湖南大學學報;1991年02期

本文編號：2372204