大跨径钢管混凝土拱桥非线性静风稳定性分析

发布时间：2018-10-15 11:37

【摘要】：近年来,钢管混凝土拱桥作为一种新颖的结构型式,在我国得到迅猛发展。在竖向荷载作用下,拱肋将承受很大的轴向压力及弯矩作用,采用钢管混凝土材料非常合理,因为钢管混凝土充分利用了钢管和混凝土两种材料的特性及相互作用,从而使得这种组合材料具有承载力高、塑性好、造价低及施工方便等优点。随着结构日益轻柔、长大,钢管混凝土拱桥在施工阶段及成桥运营阶段的稳定问题逐渐显现。目前,大多数学者对钢管混凝土拱桥的稳定性进行分析时,没有考虑非线性静风荷载,即使部分考虑非线性静风荷载的分析大多数情况下也只单独的考虑了拱肋或者主梁承受的静风荷载,忽略了拱梁共同承受风荷载的影响,同时大部分研究中没有考虑材料非线性的影响。本论文利用有限元分析软件,着重研究大跨径钢管混凝土拱桥的静风极限风速和结构失稳行为全过程变形曲线及稳定性的影响因素,基于风洞试验和CFD数值模拟数据对重庆菜园坝长江大桥主桥进行实桥模拟计算,从而对所得结论进行验证。主要研究内容如下:1)对钢管混凝土结构的发展、研究现状和抗风理论做了总的概述。2)对几何非线性、材料非线性和静风荷载非线性的分析方法做了总的概述。3)对考虑几何非线性、材料非线性和静风荷载非线性下的静力失稳问题求解做了机理分析。4)通过APDL语言编程对重庆菜园坝长江大桥主桥进行实桥模拟计算,进行了该桥静风失稳的全过程分析。5)研究了静风荷载下初始风攻角、矢跨比、横撑数量及形式、风荷载作用形式等影响因素对拱桥静风稳定性的影响。
[Abstract]:In recent years, concrete-filled steel tubular arch bridge, as a new type of structure, has been developed rapidly in China. Under the vertical load, the arch rib will bear great axial pressure and bending moment. It is very reasonable to use concrete filled steel tube material, because the concrete filled steel tube makes full use of the characteristics and interaction between steel tube and concrete material. Therefore, the composite material has the advantages of high bearing capacity, good plasticity, low cost and convenient construction. As the structure grows softer and softer, the stability of concrete-filled steel tubular arch bridge appears gradually in the construction stage and the operation stage of the bridge. At present, when most scholars analyze the stability of concrete-filled steel tubular arch bridge, the nonlinear static wind load is not considered. Even if the nonlinear static wind load is partially considered, the static wind load of arch rib or main beam is considered only in most cases, and the influence of wind load on arch beam is neglected. At the same time, the influence of material nonlinearity is not considered in most of the studies. In this paper, the finite element analysis software is used to study the static wind limit wind speed and structural instability behavior of long-span concrete-filled steel tube arch bridge. Based on the wind tunnel test and CFD numerical simulation data, the actual bridge simulation of the main bridge of Caiyuanba Yangtze River Bridge in Chongqing is carried out, and the conclusions obtained are verified. The main research contents are as follows: 1) the development of concrete-filled steel tubular structures, the present situation of research and the theory of wind resistance are summarized. 2) the geometric nonlinearity, The analysis methods of material nonlinearity and static wind load nonlinearity are summarized. 3) considering geometric nonlinearity, The mechanism of solving the static instability problem under nonlinear static wind load and material nonlinearity is analyzed. 4) the real bridge simulation calculation of the main bridge of Chongqing Caiyuanba Yangtze River Bridge is carried out by APDL programming. In this paper, the whole process of static wind instability of the bridge is analyzed. 5) the influence factors on the static wind stability of the arch bridge are studied, such as the initial wind attack angle, the rise-span ratio, the number and form of transverse brace, the form of wind load, and so on.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.22

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