山西中南部铁路桥梁设计活载计算参数研究

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摘要研究目的:与设计活载相关的计算参数是进行桥梁设计所考虑的主要因素之一。山西中南部铁路通道通行轴重不低于30 t的货物列车，是我国首条通行大轴重货物列车的国家I级干线，其活载效应超出了现行桥梁设计规范的规定，相关的计算参数也不同于现行规范给出的规定。为了满足通行大轴重货物列车铁路桥梁设计的需求，本文在确定了桥梁设计活载图式的基础上，对动力系数、离心力系数、牵引力和制动力系数、横向摇摆力、列车脱轨荷载等活载计算参数的计算方法或取值进行了研究，提出了适用的计算方法或取值。研究结论:(1)动力系数:采用文献[8](前苏联规范)计算；(2)离心力系数:采用《铁路桥涵设计基本规范》中第4.3.6条计算，但离心力的作用位置取轨顶以上2.2 m；(3)制动力或牵引力系数:采用文献[3]推荐的自定义计算办法；(4)横向摇摆力:沿用文献[5](中国规范)，为偏于安全计，摇摆力取120 kN；(5)列车脱轨力:按现荷载图式与中-活载图式中均布荷载的比值进行提高，即提高系数为1.2倍；(6)研究成果可直接用于通行大轴重货物列车的铁路桥梁设计。

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	李黎
	郭治胜
	孔德艳

关键词 ：铁路桥梁, 设计活载, 计算参数, 大轴重

Abstract：Calculation parameters related to the design of live load is one of the main factors for bridge design. Shanxi Central-south Region Railway is the first I grade artery line with large axle-weight freight train in China, the live load of which is beyond the stipulations of current code. The calculation parameters of the live load of this railway is also different from those of current code. In order to satisfy the design of bridges with such large axle-weight freight train load, this paper studied the methods for calculating the live load parameters such as dynamic coefficient, centrifugal force coefficient, traction coefficient, braking force coefficient, lateral oscillation force and derailment load, and proposed the applicable calculation method and values.Research conclusions:(1) Dynamic coefficient: using literature [8] (the former Soviet Union code). (2) Centrifugal factor coefficient: using clause 4.3.6 in <Fundamental code for design on railway bridge and culvert>, but the position of centrifugal force is 2.2 m above the rail top. (3) Braking or traction coefficient: using the custom calculation methods recommended by literature [3]. (4) Lateral oscillation force: follow the literature [5] (Chinese code), to be safe, the lateral oscillation force use 120 kN . (5) Train derailment forces: improved 1.2 times, which is the ratio of uniform load in current load diagram to that in Chinese railway standard live load. (6) The research results can be used directly to the design of railway bridges with large axle-weight freight train.

Key words： railway bridge live load calculation parameters large axle-weight

收稿日期: 2014-04-10

PACS:

U239.4

作者简介: 李黎，1967年出生，男，教授级高级工程师。

引用本文:

李黎，郭治胜，孔德艳. 山西中南部铁路桥梁设计活载计算参数研究[J]. 铁道工程, 2014, 31(10): 64-68.
LI Li, GUO Zhi-sheng, KONG De-yan. Research on Calculation Parameters of Live Load for the Bridge Design of Shanxi Central-south Region Railway. 铁道工程, 2014, 31(10): 64-68.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2014/V31/I10/64

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