發(fā)布時(shí)間：2018-04-10 03:21

  本文選題：曲線連續(xù)寬箱粱　切入點(diǎn)：受力不均勻性　出處：《中南林業(yè)科技大學(xué)》2015年碩士論文

【摘要】：曲線梁橋是現(xiàn)代化交通工程中的一種重要橋型。近年來(lái),隨著高等級(jí)公路和城市道路的迅速發(fā)展,同時(shí)考慮到地形、地物的限制,路線整體線形的連續(xù)性以及城市景觀美化等因素,使得曲線橋被普遍采用。但是曲線橋的彎扭耦合效應(yīng),使得其結(jié)構(gòu)分析成為一個(gè)復(fù)雜的空間問(wèn)題。目前,用于曲線寬箱梁橋分析的傳統(tǒng)梁格法計(jì)算精度有限,而三維實(shí)體元法使用又不方便。因此,既要保證計(jì)算精度、又要方便實(shí)用的曲線寬箱梁橋結(jié)構(gòu)設(shè)計(jì)計(jì)算模型與算法仍有待于進(jìn)一步研究與完善。另外,隨著曲線寬箱梁橋的大規(guī)模使用,各種病害也大量出現(xiàn),進(jìn)一步研究曲線寬箱梁橋工程事故、病害發(fā)生的力學(xué)機(jī)理及影響因素是十分必要的。本文基于梁格法、有限單元法以及比擬正交異性板法的基本原理,針對(duì)曲線寬箱梁的截面特點(diǎn),探討和提出了一種相對(duì)簡(jiǎn)單實(shí)用又具有足夠精度的改進(jìn)梁格法,即比擬板—梁格法,并提出了比擬板—梁格法在梁格劃分以及截面特性計(jì)算的一般方法。模擬實(shí)際工程,利用有限元軟件MIDAS/CIVIL和ANSYS建立曲線寬箱梁橋的傳統(tǒng)梁格模型、比擬板—梁格模型以及精細(xì)的實(shí)體元模型,研究曲線寬箱梁在不同荷載作用下的空間受力情況及內(nèi)力橫向傳遞機(jī)理。制作三跨連續(xù)曲線寬箱梁橋的有機(jī)玻璃模型,采用靜力加載的方式測(cè)得曲梁控制截面上的應(yīng)變值和撓度值,并提出了用“不均勻系數(shù)”來(lái)表達(dá)曲線橋受力的不均勻性。將試驗(yàn)結(jié)果與有限元模型的計(jì)算結(jié)果進(jìn)行比較分析,驗(yàn)算比擬板—梁格法所提模型的計(jì)算精度及實(shí)用性,同時(shí)得到了曲線連續(xù)寬箱梁的應(yīng)力與撓度橫向分布規(guī)律。以在建的湖南省大岳高速君山互通主線橋所接的A匝道第一聯(lián)曲線寬箱梁橋?yàn)楸尘?采用比擬板—梁格有限元模型對(duì)混凝土曲線連續(xù)寬箱梁進(jìn)行平面內(nèi)的變形分析。同時(shí)針對(duì)此橋的力學(xué)特點(diǎn),對(duì)其因梁體變形而可能引起的病害進(jìn)行分析,為設(shè)計(jì)、施工提供參考�！�
[Abstract]:Curved girder bridge is an important bridge type in modern traffic engineering.In recent years, with the rapid development of high-grade highways and urban roads, taking into account the terrain, the constraints of features, the continuity of the overall alignment of routes, and urban landscape beautification, curved bridges are widely used.However, the structure analysis of curved bridge becomes a complicated spatial problem because of the coupling effect of bending and torsion.At present, the traditional girder method used to analyze curved wide box girder bridges has limited accuracy, but the 3D solid element method is not convenient to use.Therefore, the calculation model and algorithm for structural design of curved wide box girder bridges should be further studied and improved.In addition, with the large-scale use of curved wide box girder bridges, a large number of diseases also appear. It is necessary to further study the engineering accidents of curved wide box girder bridges.Based on the basic principles of beam lattice method, finite element method and orthotropic plate method, this paper discusses and proposes an improved beam method, which is relatively simple and practical and has enough precision, according to the cross-section characteristics of curved wide box girder.That is to say, the plate-beam method is compared, and the general method of comparing plate-beam method in the division of beam lattice and the calculation of cross-section characteristic is put forward.In order to simulate the practical engineering, the traditional girder model of curved wide box girder bridge is established by using the finite element software MIDAS/CIVIL and ANSYS, and the plate-girder model and the fine solid element model are compared.The space force and the lateral transfer mechanism of the curved wide box girder under different loads are studied.The organic glass model of three-span continuous curved wide box girder bridge is made. The strain value and deflection value on the control section of curved beam are measured by static loading method, and the "non-uniform coefficient" is proposed to express the inhomogeneity of the curved bridge.The experimental results are compared with the results of the finite element model. The accuracy and practicability of the model proposed by the plate-beam method are compared and the transverse distribution of stress and deflection of curved continuous wide box girder is obtained.Based on the first curved wide box girder bridge of A ramp connected to the main line bridge of Dayue high-speed Junshan intercommunication in Hunan Province, the in-plane deformation analysis of concrete curved continuous wide box girder is carried out by using the finite element model of analogy slab-girder lattice.At the same time, according to the mechanical characteristics of the bridge, the possible damage caused by the deformation of the beam body is analyzed, which provides a reference for the design and construction of the bridge.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U441;U448.213

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本文編號(hào)：1729446