山西中南部重载铁路桥梁设计活载标准研究

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摘要

研究目的：铁路列车活载标准是铁路桥梁设计的核心参数，其活载图式的拟定需综合考虑移动装备现状与发展、运输模式、运营速度及加载方式等因素。本文以山西中南部铁路通道为工程背景，针对国内既有的轴重30 t重载货车，共拟定6种不同运营活载图式，根据该重载铁路桥梁的设计活载中-活载（2005）（Z=1.2），计算设计活载相对6种不同的运营荷载的发展储备系数，明确该重载铁路桥梁设计活载标准的发展储备水平，即对于小跨度和大跨度桥梁，设计活载发展储备系数较小，中等跨度桥梁设计活载发展储备系数较大。

研究结论：（1）通过对设计活载发展储备系数计算分析，山西中南部铁路通道桥梁设计活载采用中-活载（2005）（Z=1.2）能够满足开行既有30 t轴重货车的要求；（2）该活载标准对于1～12 m桥涵，设计活载的发展储备系数偏低，设计活载储备系数在1.0～1.2之间；对于加载长度12～200 m桥涵，设计活载的发展储备系数均在1.2以上；（3）中-活载（2005）的荷载图式中特种荷载值偏低致使小跨度桥涵荷载储备偏低，因此该活载图式特种荷载值需要提高；（4）该研究成果可直接用于后续的重载铁路桥梁设计。

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关键词 ：重载铁路, 山西中南部铁路通道, 发展储备系数, 中-活载（2005）

Abstract：Abstract：Research purposes： The standard of train live load is the core parameter of railway bridge design, live load diagram need consider the factors of the present situation and development of mobile equipment, transporting mode, the operation speed and loading mode. Under the background of Shanxi Central-south Region Railway corridor, six different live load diagrams are presented for the heavy load trains of 30 t axle load in China. Development reserve coefficients of these six loads are calculated to evaluate the level of development reserve, based on the Chinese railway standard live load (2005) (Z=1.2), which is the design load of this coal line. The results show that, for small and large-span bridges, the design live load development reserve coefficient is small, for medium-span bridges, the design live load development reserve coefficient is large.
Research conclusions：(1)The design live load, Chinese railway standard live load (2005) (Z=1.2) can meet the requirement of 30 t heavy axis load freight train on Shanxi Central-south Region Railway corridor at present.(2) For bridges and culverts between 1m to 12 m, the development reserve coefficients are between 1.0 to1.2；For bridges and culverts between 12 m to 200 m, the development reserve coefficients are larger than 1.2. (3)The special load in Chinese railway standard live load (2005) (Z=1.2) is small in order to load reserve coefficients of small-span bridges are relatively low, and the special load in Chinese railway standard live load (2005) need to be improved. (4) The research results can be directly applied to the subsequent design of heavy railway bridges.

Key words： Key words: heavy load railway Shanxi Central-south Region Railway corridor development reserve coefficient Chinese railway standard live load (2005)

作者简介: 孔德艳，1977年出生，女，高级工程师。

引用本文:

孔德艳1** 施威1 李小龙2. 山西中南部重载铁路桥梁设计活载标准研究[J]. 铁道工程, 2015, 32(2): 64-.
KONG De-yan1, SHI Wei1, LI Xiao-long2.

Research on the Standard Live Load for the Heavy Railway Bridge Design of Shanxi Central-south Region Railway Corridor

. 铁道工程, 2015, 32(2): 64-.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2015/V32/I2/64

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