重载铁路预应力混凝土梁桥设计及经济性分析

针对国内首条重载铁路山西中南部铁路通道工程的建设,结合系列简支T梁和连续梁的工程设计和经济性分析,得出重载预应力混凝土梁桥的合理设计,通过中活载与重载两种荷载模式下常用跨度简支T梁和系列连续梁的设计、研究,对比分析桥梁上部及下部结构的材料用量和延米造价,确定山西中南部铁路通道工程采用的混凝土梁桥线通图,主要结论如下:(1)预应力混凝土梁部设计在活载采用重载列车时,其材料用量提高值小于其承载能力提高值;(2)活载采用重载列车对下部结构的影响比值较小。

Design & Economic Analysis of Heavy Haul Railway Prestressed Concrete Bridge

With respect to the construction of the first heavy haul railway in central and southern part of shanxi,this paper addresses the rational design of prestressed concrete beam bridge on heavy haul railway based on the engineering design and economic analysis of series of simple supported T beam and continuous beam. Comparative analysis is conducted of the beam and the upper and lower structure material dosage and the linear meter cost on the basis of the design and research on the live load and overload in conventional span under two load modes of series of simply supported T beam and continuous beam,and to draw out the map of concrete beam bridge and track. The main conclusions are as follows:( 1) when the live load of prestressed concrete beam is calculated in the case of the heavy haul train,its material consumption value is less than its carrying capacity improvement value;( 2) when the live load is calculated with the heavy haul train,the impact on the infrastructure is smaller.