| 大跨径连续刚构桥混凝土结合面收缩效应分析 |
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| 引用本文： | 李小祥,石雪飞,阮欣,冯电视.大跨径连续刚构桥混凝土结合面收缩效应分析[J].武汉理工大学学报(交通科学与工程版),2009,33(1). |
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| 作者姓名： | 李小祥 石雪飞 阮欣 冯电视 |
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| 作者单位： | 同济大学桥梁工程系,上海,200092 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 采用空间有限元方法,研究大跨径连续刚构桥混凝土结合面在收缩效应下的应力分布规律,并比较浇筑时间间隔、配筋率等参数的影响.研究结果表明:依据中国<公路钢筋混凝土及预应力混凝土桥涵设:计规范>(JTG D62-2004),馄凝土浇筑不同步引起的收缩特性差异对结合面应力影响较小,而由截面剧烈变化引起的影响更为明显.浇筑时间间隔、配筋率对收缩应力影响较小,而环境年平均相对湿度对结合面收缩效应影响显著.对于厚度大的混凝土构件,美国AASHTO规范的收缩效应计算结果更加合理.有必要对JTG D62-2004中理论厚度取值的规定加以修正,建议规定,h≤300 mm.根据研究结果,提出了控制结合面开裂的设计、施工对策.
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| 关 键 词： | 大跨径连续刚构桥 有限元 混凝土结合面 收缩 混凝土龄期 |
Analysis on Shrinkage Effects of Concrete Interfaces in Long-span Continuous Rigid Frame Bridges |
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| Li Xiao-xiang,Shi Xue-fei,Ruan Xin,Feng Dian-shi.Analysis on Shrinkage Effects of Concrete Interfaces in Long-span Continuous Rigid Frame Bridges[J].journal of wuhan university of technology(transportation science&engineering),2009,33(1). |
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| Authors: | Li Xiao-xiang Shi Xue-fei Ruan Xin Feng Dian-shi |
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| Institution: | Dept.of Bridge Eng.;Tongji University;Shanghai 200092 |
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| Abstract: | hrinkage stress distribution characteristics were studied at interfaces between concrete with different ages by using finite element method.Effects on shrinkage stresses at interfaces under various factors were compared such as different casting time intervals,different reinforcement ratios.Results show that effect on shrinkage stress at interfaces caused by section property mutation is more obvious than that by different ages of concrete according to code JTG D62-2004.Shrinkage stress increases with a smal... |
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| Keywords: | long-span continuous rigid frame bridge finite element concrete interfaces shrinkage age of concrete |
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