连续道床板裂纹计算方法及影响因素  

Crack Calculation Method and Influence Factors for Continuously Reinforced Slab

作　　者：任娟娟[1] 刘学毅[1] 赵坪锐[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2010年第1期34-38,44,共6页Journal of Southwest Jiaotong University

基　　金：国家863计划资助项目(2007AA11Z129);西南交通大学青年教师科研起步项目(2009Q071);西南交通大学创新团队培育计划资助(2007IRT06)

摘　　要：为研究双块式无砟轨道连续配筋道床板裂纹扩展的机理,基于钢筋混凝土粘结-滑移理论,建立了适用于连续配筋混凝土道床板裂纹扩展的计算模型.依据该模型计算了道床板裂纹宽度和间距,分析了道床板配筋率、纵向钢筋直径和混凝土强度对裂纹宽度、间距及钢筋应力的影响.分析结果表明:钢筋直径和配筋率直接影响裂纹间距,裂纹间距随钢筋直径增大而增大,随配筋率增大而减小;混凝土抗拉强度、配筋率和钢筋直径是裂纹宽度的主要影响因素,裂纹宽度随混凝土强度和钢筋直径增大而增大,随配筋率增大而减小;裂纹截面处纵筋应力不应超过其抗拉强度,配筋率和混凝土抗拉强度是决定钢筋应力大小的关键因素.In order to research the concrete slab of twin-block ballastless slip constitutive relation between steel were calculated with this model, and development mechanism of cracks in continuously reinforced track, a theoretical model was put forward based on the bondbars and concrete. Crack width, crack space and steel bar stress their influencing factors, such as reinforcement ratio, steel bar diameter and concrete tensile increases with the increase of decreases with the reductions strength, were analyzed. The analysis results show that crack space steel bar diameter and the reduction of reinforcement ratio; crack width of concrete tensile strength and steel bar diameter and the increase of reinforcement ratio; and steel bar stress in the crack section should not exceed its tensile strength, and the key influencing factors for steel bar stress are reinforcement ratio and concrete tensile strength.

关 键 词：无砟轨道 道床板 连续配筋混凝土板 裂纹计算 裂纹宽度 裂纹间距 

分 类 号：U213.244[交通运输工程—道路与铁道工程]