【摘要】：我國古代橋梁歷史悠久,形式豐富多樣。其中廊橋作為一種具有豐富文化內涵和結構特色的建筑形式,是房屋的建筑藝術和橋梁的結構造型有機融合而成的完美產物,隨著工藝技術的進步和社會需求的增長,廊橋數量越來越多,跨度越來越大,結構形式也日益多樣化,一些廊橋已經在當地形成了一道獨特的風景線,對廊橋的研究和設計越來越受到人們的重視。然而多數廊橋的設計都是把橋體設計和上部結構的設計分開來考慮的,很少注意到廊橋橋體對上部結構的影響,實際上廊橋的橋身撓曲變形會對廊橋上部結構產生不利的影響,情節嚴重的甚至會使之坍塌、毀壞,造成嚴重后果。因此,對廊橋橋身撓曲引起上部結構的受力性能進行分析也顯得尤為重要。本文首先就廊橋的基本功能、設計與造型特點做了簡要討論,接著應用相關的理論知識計算出廊橋主殿橋身的不同撓曲引起上部結構的沉降量,然后采用有限元數值分析軟件Midas/Civil建立了風雨廊橋主殿的計算模型,借助軟件計算出的數據來討論廊橋橋身撓曲對上部結構的影響。主要進行了兩點分析:先分析了廊橋主殿橋身產生最大撓曲引起上部結構沉降,從而對上部結構內力和變形的影響,然后進一步研究了風雨廊橋主殿橋身的不同撓曲變化對上部結構內力和變形的影響,并將幾種結果進行對比分析,以此研究廊橋下部橋體結構撓曲變形對廊橋上部結構的影響。通過對廊橋模型的分析可知:廊橋橋身撓曲對上部結構位移影響相對較小,其中側殿水平位移比正殿要大一些;廊橋橋身撓曲對上部結構柱子的軸力造成很大影響,正殿或者側殿每層的柱腳軸力最大值都在距離跨中最遠的邊柱上;橋身撓曲引起上部結構柱子彎矩的變化很大,主殿每層柱子的彎矩最小值都在距離跨中最近的中柱上,但是柱彎矩的最大值卻不在距離跨中最遠處;當廊橋主殿達最大撓度時,上部結構梁端剪力的變化和上部結構梁端彎矩的變化都很大,尤其是主殿一層的梁端彎矩和剪力在各工況作用下變化比較大。
[Abstract]:Ancient bridges in China have a long history and rich and diverse forms. As a kind of architectural form with rich cultural connotation and structural characteristics, the corridor bridge is the perfect product of the organic integration of the architectural art of the house and the structural modeling of the bridge. With the progress of technology and the growth of social demand, the number of corridor bridges is more and more, the span is becoming larger and larger, and the structural forms are becoming more and more diversified. Some corridor bridges have formed a unique landscape in the local. More and more attention has been paid to the research and design of corridor bridges. However, most of the design of the corridor bridge is considered separately from the design of the superstructure, and little attention is paid to the influence of the bridge body on the superstructure. In fact, the deflection and deformation of the bridge body will have a negative impact on the superstructure of the bridge, and the circumstances will even collapse and destroy, resulting in serious consequences. Therefore, it is particularly important to analyze the mechanical properties of superstructure caused by deflection of corridor bridge. In this paper, the basic functions, design and modeling characteristics of the corridor bridge are briefly discussed, and then the settlement of the superstructure caused by different deflection of the main hall of the corridor bridge is calculated by using the relevant theoretical knowledge. Then, the calculation model of the main hall of the wind and rain corridor bridge is established by using the finite element numerical analysis software Midas/Civil, and the influence of the deflection of the bridge body on the superstructure is discussed with the help of the data calculated by the software. This paper mainly analyzes two points: firstly, it analyzes the influence of the maximum deflection of the main hall bridge body on the internal force and deformation of the superstructure, and then further studies the influence of different deflection changes of the main hall bridge body on the internal force and deformation of the superstructure, and compares and analyzes several results, so as to study the influence of the deflection deformation of the lower bridge structure of the corridor bridge on the superstructure of the superstructure. Through the analysis of the corridor bridge model, it can be seen that the deflection of the bridge body has relatively little effect on the displacement of the superstructure, in which the horizontal displacement of the side hall is larger than that of the main hall, and the deflection of the bridge body has a great influence on the axial force of the columns of the superstructure, and the maximum axial force of the column foot of each floor of the main hall or side hall is on the side column farthest from the middle of the span. The bending moment of the superstructure column changes greatly due to the deflection of the bridge body. The minimum bending moment of each column in the main hall is on the middle column nearest to the span, but the maximum bending moment of the column is not the farthest from the middle span. When the maximum deflection of the main hall of the corridor bridge reaches, the variation of the shear force at the beam end of the superstructure and the bending moment at the beam end of the superstructure are great, especially the bending moment and shear force at the beam end of the first floor of the main hall vary greatly under various working conditions.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441

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本文編號：2505299