48m钢筋混凝土拱板组合桥静动力分析

发布时间：2018-01-10 09:36

本文关键词：48m钢筋混凝土拱板组合桥静动力分析　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：拱桥作为应用较为广泛的桥型之一，历史悠久、造型美观、经济适用、承载潜力大。同时，拱桥这一结构型式可以展现城市的建筑风貌，因而在桥梁建设中得到广泛应用。本文研究对象为拱板组合桥（Deck Arch Composite Bridge），属于上承式空腹拱桥。基于前人对拱桥研究的成果，本文结合实际工程对拱板组合桥开展了一系列研究，，主要内容如下：（1）利用有限元软件MIDAS Civil建立桥梁模型，分析桥梁在不同荷载工况下主拱圈受力情况，根据静力分析结果，找出对该类桥梁起控制作用的最不利工况组合及影响该类桥梁受力的最不利因素。（2）建立不同矢跨比桥梁模型，分析在最不利受力工况组合下，矢跨比对主拱圈受力性能的影响，从而得出相应的规律。（3）建立动力分析模型，分析桥梁自振特性。（4）输入标准反应谱曲线，分别考虑地震波为顺桥向、横桥向和竖桥向三种工况，分析在地震输入作用下桥梁结构的动力响应。研究结果表明：（1）拱脚沿顺桥向的水平位移和主拱圈的整体温度变化是拱板组合桥设计的关键因素。（2）在所研究的范围内，矢跨比的变化对主拱圈内力及竖向位移变化的影响幅度较小，且随矢跨比增加主拱圈内力及竖向位移呈逐渐增大趋势。（3）通过对拱板组合桥的动力分析，得到该桥梁的基本周期为1.577sec，属于偏柔性结构。（4）主拱圈在受X、Y、Z三个方向地震加速度作用下的位移值表现为沿作用方向的响应值远大于另外两个方向的响应值。
[Abstract]:As one of the widely used bridge types, arch bridge has a long history, beautiful appearance, economic applicability and great potential for bearing capacity. Meanwhile, the structure of arch bridge can show the architectural style of the city, so it has been widely applied in bridge construction.
The object of this paper is the Deck Arch Composite Bridge. It belongs to the open top hollow arch bridge. Based on the previous research results of arch bridge, combined with practical engineering, a series of research on arch bridge composite bridge is carried out. The main contents are as follows:
(1) use the finite element software MIDAS Civil to establish bridge model, analyze the stress condition of main arch ring under different load conditions. According to the static analysis result, find out the most unfavorable combination of the type of bridge and the most unfavorable factors affecting the bridge's stress.
(2) to establish a different span ratio bridge model, and analyze the influence of the span ratio on the force performance of the main arch under the combination of the most disadvantageous loading conditions, and thus the corresponding rules are obtained.
(3) the dynamic analysis model is established to analyze the self vibration characteristics of the bridge.
(4) input the standard response spectrum curve, and consider the three kinds of working conditions of the seismic wave as the longitudinal bridge, the transverse bridge and the vertical bridge respectively, and analyze the dynamic response of the bridge structure under the action of earthquake input.
The results of the study show that:
(1) the horizontal displacement of the arch foot along the CIS bridge and the overall temperature change of the main arch are the key factors for the design of the arch plate combined bridge.
(2) within the scope of the study, the influence of the rise span ratio on the internal force and vertical displacement of the main arch is relatively small, and the internal force and vertical displacement of the main arch ring tend to increase with the increase of the ratio of rise to span.
(3) through the dynamic analysis of the arch plate combined bridge, the basic period of the bridge is 1.577sec, which belongs to the partial flexible structure.
(4) the displacement value of the main arch under the action of three directions of X, Y and Z is that the response value along the direction of action is far greater than the response value of the other two directions.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22;U441

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