| 基于混凝土自收缩的钢筋保护层厚度数值分析 |
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| 引用本文： | 徐岳,唐先习.基于混凝土自收缩的钢筋保护层厚度数值分析[J].广西大学学报(自然科学版),2010,35(1). |
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| 作者姓名： | 徐岳 唐先习 |
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| 作者单位： | 1. 长安大学公路学院,陕西,西安,710064
2. 长安大学公路学院,陕西,西安,710064;兰州理工大学土木工程学院,甘肃,兰州,730050 |
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| 基金项目： | 国家西部交通建设科技项目(200631822302-04) |
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| 摘 要： | 为研究混凝土自收缩状态下钢筋保护层合理厚度值,建立了50组钢筋混凝土构件的ANSYS有限元数值模型,通过施加温度荷载使混凝土产生收缩,进行混凝土开裂状况的分析。分析结果表明,钢筋直径对保护层厚度的影响较大,当钢筋直径由1cm到5cm按1cm增幅增加时,对应的薄弱面保护层厚度和开裂保护层厚度则分别有较大的增加。混凝土强度对保护层厚度的影响较小,在C20、C40和C60三种强度的混凝土中,C20混凝土要求的保护层厚度相对较大,C60次之,C40要求的最小。根据分析结果可知,当钢筋直径大于3cm时,保护层合理厚度应不小于钢筋公称直径加1cm和国内相关规范规定的最小保护层厚度。同时,在满足工程需要的前提下,建议尽量少使用直径大于3cm的钢筋以及标号过高或过低的混凝土。
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| 关 键 词： | 钢筋混凝土 保护层厚度 数值分析 混凝土自收缩 钢筋直径 混凝土强度 |
Numerical analysis of reinforcement cover thickness based on concrete autogenous shrinkage |
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| XU Yue,TANG Xian-xi.Numerical analysis of reinforcement cover thickness based on concrete autogenous shrinkage[J].Journal of Guangxi University(Natural Science Edition),2010,35(1). |
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| Authors: | XU Yue TANG Xian-xi |
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| Institution: | 1. School of Highway;Chang'an University;Xi'an 710064;China;2. School of Civil Engineering;Lanzhou University of Technology;Lanzhou 730050;China |
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| Abstract: | In order to study the reasonable thickness of reinforcement cover based on the autogenous shrinkage of concrete,50 groups of finite element models for reinforced concrete members were built in ANSYS. Concrete cracking due to concrete shrinkage after temperature load applied have been analyzed. The analysis results indicate that the reinforcement diameter has great influence on cover thickness. When the reinforcement diameter increases from 1cm to 5cm by the pace of 1cm,the cor-responding cover thickness of ... |
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| Keywords: | reinforced concrete cover thickness numerical analysis concrete autogenous shrinkage reinforcement diameter concrete strength |
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