Study on the Influence of Concrete Time-varying Characteristics on Highway Bridge Structure
莫彬彬1
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作者信息
1. 中铁十八局集团第二工程有限公司,河北唐山 064000
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摘要
混凝土的收缩徐变(Shrinkage and Creep,SC)的时变特性属于独有特征,其中预应力混凝土公路桥梁会导致巨大的影响.为实现准确预测高性能混凝土结构的时变特性,研究依托于白鹤滩水电站东川区移民安置工程龙东格公路(含支线)复建工程,在高性能混凝土的基础上设计自然条件下的时变特性试验与公路桥梁性能影响试验.研究结果显示,高性能混凝土强度在7d内发展较快,2周后发展缓慢;弹性模量在第7d时已经超过第28d的85％.
Abstract
The time-varying characteristics of shrinkage and creep(SC)in concrete are unique,with prestressed concrete highway bridges causing significant impacts.To accurately predict the time-varying characteristics of high-performance concrete structures,the research relies on the reconstruc-tion project of Longdongge Highway(including branch lines)in Dongchuan District of Baihetan Hydro-power Station.Based on high-performance concrete,time-varying characteristics tests under natural conditions and performance impact tests on highway bridge beams are designed.The results show that the strength of high-performance concrete develops rapidly within 7 days and slowly after 2 weeks.The elastic modulus has exceeded 85％of the 28th day on the 7th day.
关键词
混凝土/高性能/时变特性/公路桥梁/收缩徐变/应用策略
Key words
concrete/high performance/time-varying characteristics/highway bridges/shrink-age and creep/application strategy
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