基于综合指数法的无砟轨道配筋方案检算与分析  

Checking and Analysis of Reinforcement Arrangement Scheme for Slab Track Based on Comprehensive Index Method

作　　者：高亮[1] 赵闻强 钟阳龙 仝凤壮 GAO Liang;ZHAO Wenqiang;ZHONG Yanglong;TONG Fengzhuang(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《西南交通大学学报》2021年第3期500-509,共10页Journal of Southwest Jiaotong University

基　　金：国家重点研发计划(2016YFB1200402);国家自然科学基金(高铁联合基金)(U1734206);中国铁路总公司科技研究开发计划(2017G010-A)。

摘　　要：为优化无砟轨道配筋后结构受力的均衡性,基于综合指数法提出了轨道配筋检算评估方法,选取形状改变能密度与高斯曲率作为评价分量构造了量化的配筋检算指标;建立了无砟轨道配筋检算有限元模型,以CRTSⅢ型普通板式无砟轨道板配筋为例,研究了不同钢筋排布方式对无砟轨道板整体受力性能的影响.研究结果表明:相较传统应力变形指标,构建的综合指数指标能够凸显轨道板的不均匀受力区域;配筋时在轨下位置额外密布钢筋能够提升轨道板抵抗垂向车辆荷载的能力;局部配筋过于集中的方案会降低轨道板适应温度荷载的能力;在升温荷载作用下其轨道板端部的综合指数较最优工况时至少增大了1倍;综合来看,钢筋直径较大、排列稀疏的方案受力均衡性较差,无砟轨道板应选择钢筋直径较小、排列密布且轨下位置适当加密的配筋方案.To optimize the mechanical performance of the slab track after reinforcement,an evaluation method for track reinforcement was proposed based on comprehensive index method.The shape change energy density and Gaussian curvature were selected as the evaluation components to construct the quantitative checking index of the reinforcement.Taking CTRSⅢordinary type slab track as an example,a finite element model for slab reinforcement checking was established,and the influence of different reinforcement schemes on the overall mechanical performance of slab was analyzed.The results indicate that the proposed comprehensive index could highlight the uneven stress area of the track slab.The centralized reinforcement under the rail position can improve the resistance of the track slab to the vertical vehicle load.However,the excessively concentrated reinforcement will lead to a worse adaptability to the temperature load.Compared to the optimum scheme,the comprehensive index of the end of the track plate of the excessively concentrated reinforcement scheme under the heating load is more than doubled.The scheme with larger steel bar diameter and sparse arrangement has poor force balance.The track slab should choose a reinforcement scheme with smaller steel bar diameter,densely arranged,and appropriate centralized under the rail.

关 键 词：无砟轨道 配筋 温度效应 结构优化 综合指数法 

分 类 号：U213.244[交通运输工程—道路与铁道工程]