预应力混凝土曲线箱梁的力学性能分析

发布时间：2018-06-08 19:12

本文选题：曲线箱梁 + 预应力混凝土　；参考：《北京交通大学》2016年硕士论文

【摘要】：随着城市交通和高速公路得的快速扩张,预应力混凝土曲线箱梁桥得到了广泛的运用。预应力混凝土曲线箱梁由于其复杂的几何性质,力学特性较直桥复杂。因此,为了得到曲线箱梁桥明确的力学特性,应对曲线箱梁的研究越来越多。在已有研究结果的基础上,本研究基于某工程背景桥梁,借助有有限元理论、预应力混凝土曲线梁桥计算理论及有限元软件对预应力混凝土曲线箱形梁进行了变参数的静力分析,得到了相应的预应力混凝土曲线箱梁的力学特性。本文的主要研究工作如下。(1)对预应力混凝土箱梁桥的发展进行介绍,结合有限元理论、预应力混凝土曲线梁桥计算理论对预应力混凝土曲线箱梁桥的计算要点进行了总结。(2)依托某工程背景桥梁,采用Midas civil软件建立有限元模型进行分析。通过静动计算结果,得出曲线箱梁桥的边界约束变化(支座位置变化)对其刚度及内力的影响。(3)通过有限元软件,对以工程背景桥梁进行变参数静力分析,以比较曲线箱梁在不同半径和不同高度时的力学特性。结果表明,预应力混凝土曲线箱梁在自重和预应力荷载作用下的位移和应力随着曲线半径减小、高度增加时而变大。(4)分析了温度作用对曲线箱梁的影响。结果表明,当曲线箱梁半径较小时,温度对其影响较大。当半径增大时,温度的影响较小。但是,在温度作用下,当梁高变化时,曲线箱梁的变形也会发生改变。本文通过对预应力混凝土曲线箱梁桥进行了变参数的静力分析,通过建立有限元模型对不同结构构造变化对曲线箱梁桥进行了分析研究。通过对计算结果的整理,总结出了曲线桥梁在变参数条件的下的受力特性的变化规律。研究结果可为类似的预应力混凝土曲线箱梁桥的设计提供一定的参考。
[Abstract]:With the rapid expansion of urban traffic and highway, prestressed concrete curved box girder bridge has been widely used. The mechanical properties of prestressed concrete curved box girder are more complicated than that of straight bridge because of its complicated geometric properties. Therefore, in order to obtain the explicit mechanical properties of curved box girder bridge, more and more research on curved box girder should be done. Based on the existing research results, this study is based on a certain engineering background bridge, with the help of finite element theory. The calculation theory of prestressed concrete curved girder bridge and the finite element software are applied to the static analysis of the prestressed concrete curved box girder with variable parameters, and the mechanical properties of the corresponding prestressed concrete curved box girder are obtained. The main research work of this paper is as follows: 1) the development of prestressed concrete box girder bridge is introduced, combined with finite element theory, Based on the calculation theory of prestressed concrete curved girder bridge, the main points of calculation of prestressed concrete curved box girder bridge are summarized. The finite element model of prestressed concrete curved box girder bridge based on a certain engineering background bridge is established by Midas civil software. Through the static and dynamic calculation results, the influence of the boundary constraint change (bearing position change) on the stiffness and internal force of curved box girder bridge is obtained. Through the finite element software, the variable parameter static analysis of the bridge with engineering background is carried out. The mechanical properties of curved box girder at different radii and heights were compared. The results show that the displacement and stress of prestressed concrete curved box girder under the action of deadweight and prestressed load decrease with the radius of the curve, and the height of the curved box girder increases with the increase of height. (4) the effect of temperature on the curved box girder is analyzed. The results show that when the radius of curved box girder is small, temperature has a great effect on it. When the radius increases, the influence of temperature is small. However, under the action of temperature, the deformation of curved box girder will also change when the beam height changes. Through the static analysis of the variable parameters of prestressed concrete curved box girder bridge and the finite element model, the structural changes of the curved box girder bridge with different structures are analyzed and studied in this paper. Through the arrangement of the calculation results, the variation law of the stress characteristics of the curved bridge under the condition of variable parameters is summarized. The results can provide some reference for the design of similar prestressed concrete curved box girder bridge.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U441

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