铁路桥梁结构任意截面截面特性计算方法研究  

Research on the Calculation Method of Arbitrary Cross-section Property for Railway Bridge Structures

作　　者：杨智慧 YANG Zhihui(China Railway Design Corporation Tianjin 300142,China)

机构地区：[1]中国铁路设计集团有限公司,天津300142

出　　处：《铁道工程学报》2022年第6期31-36,66,共7页Journal of Railway Engineering Society

基　　金：中国铁路设计集团有限公司科研项目(2020YY340641)。

摘　　要：研究目的:铁路桥梁结构设计中,无论是结构抗力还是工程量计算,截面特性均是重要的设计计算参数。铁路桥梁结构类型多,梁部、桥墩和基础等不同构件截面类型复杂多样,且多为箱形、空心截面等复杂截面形式,设计中对复杂截面截面特性的计算通常采用简化处理方式或借助外部商业软件,导致计算精度不足或设计效率低下,为解决这一问题,需要开展任意截面的截面特性计算方法研究。研究结论:(1)铁路桥梁结构截面均只由线段和圆弧组成,可采用统一格式表征,任意截面均可用一个或多个封闭轮廓线描述;(2)每个封闭轮廓线可离散为多组具有共同顶点的三角小块和三角球冠小块,计算每个小块截面特性并叠加便可得到封闭轮廓线截面特性;(3)基于计算理论编写了通用计算程序,程序提供读取和处理AutoCAD软件图形数据的方法;(4)以混凝土箱梁和薄壁钢箱梁作为算例,计算结果表明本文提出的方法计算精度高,满足工程设计要求;(5)本文给出的计算方法理论推导清晰,除铁路工程外,在公路和市政工程等领域依然适用。Research purposes:Cross-section property is an important parameter in design of railway-bridge structures,not only in resistance of structure calculation,but also in engineer quantity calculation.With a variety of structure types,such as beams,piers and foundations,the railway-bridge has complex cross-section types,such as box section and hollow section.The cross-section property calculation of complex section type in design is accomplished by simplified processing method or external business software in usual practice,which result in insufficient calculation accuracy and low design efficiency.To solve this problem,it is necessary to research the calculation method of arbitrary cross-section property.Research conclusions:(1)Any cross-sections type of railway-bridge structure is consist of segments and arcs,every segment of arc could be represented by a unified format.Based on this,arbitrary cross-section type could be described by one or more closed contours,which is composed of segments and arcs.(2)Every closed contour could be considered as multiple sets of triangle patch or triangle-spherical-crown patch with the common vertex.The cross-section property of the whole closed contour could be got by summing all the patches property.(3)A general calculation program was developed based on the calculation method proposed in this paper.This program had the function of reading and processing graphic data of AutoCAD software.(4)Taking concrete box beam and thin-walled steel box beam as examples,the calculation results showed that the method proposed in this paper had high calculation accuracy and met the requirements of engineering design.(5)Besides the railway-bridge engineering,the calculation method could also be used in highway or municipal engineering.

关 键 词：铁路桥梁 任意截面 截面特性 面积 惯性矩 静矩 

分 类 号：U24[交通运输工程—道路与铁道工程]