明桥面重组竹轨枕材性试验与受力性能研究  

Study on Material Property Test and Mechanical Performance of Recombined Bamboo Sleepers on Open Bridge Deck

作　　者：王达[1,2] 和家名 谭本坤 WANG Da;HE Jiaming;TAN Benkun(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]长沙理工大学土木工程学院,长沙410114 [2]中南林业科技大学土木工程学院,长沙410004

出　　处：《铁道建筑》2023年第7期24-29,共6页Railway Engineering

摘　　要：重组竹轨枕是一种以高强竹纤维束、基体组织和树脂胶体为主要成分,通过将竹纤维束干燥改性、施胶、组坯成型后热压而成的新型生物质轨枕。为探究重组竹轨枕在明桥面上替换普通轨枕材料的适用性与可行性,本文结合试验结果对比重组竹与常规轨枕材料力学指标,通过Abaqus软件对由5根重组竹轨枕组成的宏观轨排模型进行受力分析,研究截面尺寸与轨枕间距变化对轨道结构关键受力指标的影响。结果表明:重组竹材料强度指标均远优于木枕材料,具有较高的强重比,弹性模量介于木轨枕与混凝土轨枕之间;在满足明桥面使用要求的前提下,重组竹轨枕的应力储备有较大富余,截面尺寸可调整空间大。综合考虑轨枕承载力要求、施工安装空间等因素,推荐重组竹轨枕宽度取200~280 mm,厚度取200~260 mm,轨枕间距优选0.6 m,长度符合构造要求即可。Recombined Recombined bamboo sleeper is a new type of biomass sleeper,which is mainly composed of high-strength bamboo textile bundles,matrix structure and resin colloid,and is formed by drying and modifying bamboo textile bundles,sizing,forming preforms and hot pressing.In order to explore the applicability and feasibility of recombined bamboo sleepers replacing ordinary sleeper materials on the open bridge deck,the strength of materials indexes of recombined bamboo sleepers and conventional sleepers was compared based on the test results.A macro rail panel model composed of five recombined bamboo sleepers was subjected to stress analysis by using Abaqus software,and the influence of changes in cross-sectional size and sleeper spacing on key stress indicators of the track structure was studied.The results show that the strength indicators of the recombined bamboo material are far superior to those of the wooden sleeper material,with a high strength to weight ratio and an elastic modulus between the wooden sleeper and the concrete sleeper.On the premise of meeting the requirements for the use of the open bridge deck,the stress reserve of the recombined bamboo sleepers is relatively large,and the cross-sectional size can be adjusted with a large space.Taking into account factors such as the bearing capacity requirements of the sleepers and the construction and installation space,it is recommended to choose a width of 200~280 mm and a thickness of 200~260 mm for the recombined bamboo sleepers.The optimal spacing between sleepers is 0.6 m,and the length meets the structural requirements.

关 键 词：铁路桥梁 重组竹 数值模拟 轨枕 材性试验 结构设计 几何尺寸 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]