Field Monitoring Study of Temperature Effect for Prestressed Concrete Box-girder Bridge
Field monitoring and theoretical analysis are carried out to investigate the temperature effect of prestressed concrete box-girder bridge. The fluctuation law of temperature field and thermal stress resulted from concrete hydration are also analyzed. Furthermore, nonlinear distribution of temperature gradient and variation law of thermal stress, as well as the deflection of box girder, which induced by daily atmosphere temperature variation and solar radiation, are obtained on the basis of long term field monitoring. It is concluded that the temperature effect cannot be ignored from the results of field monitoring and theoretical study. The thermal stress of hydration may induce temperature cracking at early stage, of curing period. Thermal stress due to daily atmosphere temperature variation and solar radiation is comparable to stress induced by live loads. In addition, some preventive measures against temperature cracks and conclusions are drawn based on this study.
Box-girder bridge Temperature effect Field monitoring Nonlinear temperature gradient Temperature cracking Preventive measure
Baoguo Chen Junjie Zheng Rui Ding
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China Hubei Key Laboratory of Control Structure, Huazhong University of Science and Technology, Wuhan 430074, China
国际会议
南京
英文
613-620
2007-10-16（万方平台首次上网日期，不代表论文的发表时间）