2012, Volume 14, Issue 5
Strategic Study of CAE >> 2012, Volume 14, Issue 5
Study on anti crack design method for laminating crack at bottom slab in closure segment
1. Jiangsu Provincial Yangtze River Highway Bridge Construction Commanding Department, Taizhou, Jiangsu 225321, China;
2. Engineering Institute of Corps of Engineers, PLA University of Science & Technology, Nanjing 210007, China
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Abstract
According to the phenomenon of laminating crack while tensioning the pre-stressed cables at bottom slab in closure segment for prestressed concrete continuous box girder bridges constructed by hanging basket, different failure criterions of concrete are introduced in this paper. It indicates from theory that the failure criteria under biaxial stress is more applicable to anti-crack design than the maximum tensile stress criterion for closure segment of box girder bridges. Based on 8 typical bridges that selected as the research objects, the FEM (finite element method)models are established and the transverse and vertical stress between pre-stressed tendons at bottom slab in closure segment are obtained; the stress state and security of bottom slab under different failure criteria are forecasted and compared with field test data. Finally, the theoretical analysis is proved. The conclusions can be regarded as reference for the anti-crack design of similar bridges.
Keywords
bridge engineering ; bottom slab ; finite element method ; failure criterion ; biaxial stress
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References
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