Structure Optimization Research on Railway Stations Based on Conceptual Analysis

Using the method of Interpretative Structural Model(ISM),the relationship between the amount of engineering material and the design parameters of railway station is researched,and the logical hierarchical relationship of the structural design parameters is obtained.All design parameters of station canopy structure affect the steel consumption,but reference wind pressure,material strength and canopy height have the greatest impact,which are in the first level of the logical relationship.The design parameters in the second level,such as structure type,station layout,basic column grid,seismic fortification intensity and so on,have a greater impact.Other parameters in the lower level have less impact on steel consumption.Combined with ISM analysis results,choosing the design parameters in the first and second levels which have greater impact on the economical efficiency of canopy as the main variables,the canopy structure is optimized by conceptual analysis method and the reasonable structure forms under different conditions as well as the range of steel consumption are obtained.Results show that,with steel consumption as optimization target,the economical efficiency of bilateral cantilever canopy is superior to that of unilateral one.Solid web steel beam structure is applicable for all bilateral cantilever canopies.The applicable structure form for unilateral cantilever canopy depends on its span,reference wind pressure,with or without a rod and other conditions.