| 连续道床板裂纹计算方法及影响因素 |
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| 引用本文： | 任娟娟,刘学毅,赵坪锐.连续道床板裂纹计算方法及影响因素[J].西南交通大学学报,2010,45(1). |
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| 作者姓名： | 任娟娟 刘学毅 赵坪锐 |
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| 作者单位： | 西南交通大学,土木工程学院,四川,成都,610031 |
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| 基金项目： | 国家863计划资助项目，感谢西南交通大学青年教师科研起步项目，西南交通大学创新团队培育计划资助 |
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| 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.
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| 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 |
Crack Calculation Method and Influence Factors for Continuously Reinforced Slab |
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| REN Juanjuan,LIU Xueyi,ZHAO Pingrui.Crack Calculation Method and Influence Factors for Continuously Reinforced Slab[J].Journal of Southwest Jiaotong University,2010,45(1). |
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| Authors: | REN Juanjuan LIU Xueyi ZHAO Pingrui |
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| Institution: | REN Juanjuan,LIU Xueyi,ZHAO Pingrui(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China) |
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| Abstract: | In order to research the development mechanism of cracks in continuously reinforced concrete slab of twin-block ballastless track,a theoretical model was put forward based on the bond-slip constitutive relation between steel bars and concrete.Crack width,crack space and steel bar stress were calculated with this model,and their influencing factors,such as reinforcement ratio,steel bar diameter and concrete tensile strength,were analyzed.The analysis results show that crack space increases with the increase ... |
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| Keywords: | ballasfless track track slab continuously reinforced concrete slab (CRCS) crack calculation crack width crack space |
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