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《Journal of Hydroelectric Engineering》 2013-01
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Prestress analysis of prestressed concrete liner based on in-situ monitor data

KANG Jingfu,CUI Shihui(School of Civil Engineering,Tianjin University/Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin 300072)  
Using in-situ monitor data in flushing tunnel liner of Xiaolangdi reservoir,this paper studies the developments of concrete stress and concrete creep during its prestressing.By establishing a reasonable tensioning procedure and a specific data collecting system,the measured total strain can be decomposed into elastic strains,concrete creep and prestress loss-related strain.The results show that the concrete creep developed over the prestressing period accounts for roughly 24% of the total strain change.Concrete creep is proportional to the existing stress and the loading time t,and it can be expressed as ε=ασt with coefficient α not a constant,but rather a constraint-dependent variable.This study also shows that the concrete stress and stress distribution calculated with a finite element method agree with the in-situ measurements.
【Fund】: 国家自然科学基金(50979068)
【CateGory Index】: TV332
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