本文選題：扭轉(zhuǎn)荷載　切入點：模型試驗　出處：《西南交通大學(xué)》2017年碩士論文

【摘要】：懸索橋由于其良好的跨越能力、優(yōu)美的結(jié)構(gòu)造型、明確的受力體系,在大跨橋領(lǐng)域扮演著越來越重要的角色。本文針對懸索橋中的雙層板桁結(jié)合橋面桁梁加勁梁的扭轉(zhuǎn)行為進行研究,主要的內(nèi)容和結(jié)論有如下:一、對于雙層板桁結(jié)合橋面桁梁加勁梁,采用模型試驗的方法,選取一個節(jié)段,針對該節(jié)段進行偏心荷載作用下變形行為的研究,并建立了與試驗?zāi)Ｐ鸵恢碌挠邢拊Ｐ?模擬試驗過程,與試驗結(jié)果進行比對,最后發(fā)現(xiàn)該結(jié)構(gòu)在偏心荷載作用下,橫截面不僅會出現(xiàn)剛性扭轉(zhuǎn),而且會發(fā)生較顯著的剪切變形。二、推導(dǎo)板桁結(jié)合橋面桁梁在扭轉(zhuǎn)荷載作用下的響應(yīng)計算方法。采用剛度等效的原則將其連續(xù)等效化為薄壁箱梁,并根據(jù)其在扭轉(zhuǎn)荷載作用下是否只發(fā)生剛性扭轉(zhuǎn)分成了橫截面可變形和不可變形兩種情況進行分析。對于在扭轉(zhuǎn)荷載作用下橫截面只發(fā)生剛性扭轉(zhuǎn)的情況,應(yīng)用閉口截面薄壁桿件烏曼斯基約束扭轉(zhuǎn)理論,獲得關(guān)于扭轉(zhuǎn)變形的微分方程。對于橫截面可變形的扭轉(zhuǎn),將橫截面的變形看作是剛性扭轉(zhuǎn)和剪切變形的疊加,而扭轉(zhuǎn)荷載分解為純扭矩荷載和雙向反力偶荷載,最后獲得關(guān)于橫截面扭轉(zhuǎn)變形和剪切變形的微分方程組。選取楊泗港長江大橋的加勁梁,運用解析法與有限元法對結(jié)構(gòu)在扭轉(zhuǎn)荷載下的響應(yīng)進行求解,并對比計算結(jié)果,發(fā)現(xiàn)求解效果良好。三、將前面獲得的加勁梁扭轉(zhuǎn)效應(yīng)計算方法推廣到懸索橋在豎向偏心荷載作用下變形響應(yīng)的計算。采用經(jīng)典的撓度理論,獲得了懸索橋加勁梁在偏心荷載作用下,關(guān)于加勁梁扭轉(zhuǎn)響應(yīng)的微分方程組,并介紹了微分方程組的求解方法以及步驟,以楊泗港長江大橋為例,分別采用撓度理論和有限元方法進行求解,在計算加勁梁扭轉(zhuǎn)變形方面,撓度理論與有限元法的計算結(jié)果吻合度較高。
[Abstract]:The suspension bridge, due to its good span ability, graceful structural shape, clear force system, In this paper, the torsional behavior of stiffened beam with double deck truss in suspension bridge is studied. The main contents and conclusions are as follows: 1. For the stiffened beam of double-deck truss beam combined with bridge deck, a segment is selected by model test, and the deformation behavior of the section under eccentric load is studied, and a finite element model consistent with the experimental model is established. Compared with the experimental results, it is found that the cross section of the structure will not only appear rigid torsion, but also have obvious shear deformation under eccentric load. The method of calculating the response of slab truss combined with bridge deck truss under torsional load is deduced. The principle of stiffness equivalence is adopted to convert the continuous equivalent to thin-walled box girder. According to whether there is only rigid torsion under torsional load, it is divided into two cases: transversal deformable and non-deformable. For the case that only rigid torsion occurs under torsional load, The differential equation of torsional deformation is obtained by using the Wumansky constrained torsion theory for thin-walled bars with closed section. For the deformable torsion of cross-section, the deformation of cross-section is regarded as the superposition of rigid torsion and shearing deformation. The torsional load is decomposed into pure torque load and bidirectional countercouple load. Finally, the differential equations about torsional deformation and shear deformation of cross section are obtained. The stiffened beam of Yangsigang Yangtze River Bridge is selected. The analytical method and finite element method are used to solve the response of the structure under torsional load, and the results are compared and the results are found to be good. The calculation method of torsional effect of stiffened beam is extended to the calculation of deformation response of suspension bridge under vertical eccentric load. The classical deflection theory is used to obtain the stiffening beam of suspension bridge under eccentric load. In this paper, the differential equations of torsional response of stiffened beam are introduced, and the solving methods and steps of the differential equations are introduced. Taking Yangsigang Yangtze River Bridge as an example, the deflection theory and finite element method are used to solve the problem, respectively. In the calculation of torsional deformation of stiffened beam, the deflection theory is in good agreement with the result of finite element method.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.25

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