Prestress concrete bridge corrosion fatigue life prediction method
A corrosion fatigue and life prediction technology, applied in bridges, bridge materials, bridge maintenance, etc., can solve the problems of increasing difficulty in determining fatigue damage parameters and complex stress states
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[0078] (1) Determine the elastic strain of concrete in the compression zone under fatigue load
[0079] First, calculate the elastic strain at the top of the concrete in the compression zone for:
[0080]
[0081] In the formula, with are respectively the elastic modulus of concrete after n-1 times of fatigue and the bending moment effect caused by the effective tensile force of the steel strand; x n with are respectively the section bending moment effect caused by the vehicle load after n times of fatigue, the height of the compression zone and the moment of inertia of the cracked section, where x n You can refer to the calculation method for the height of the compression zone in the partially prestressed concrete flexural member.
[0082] The moment of inertia of the cracked section can be expressed as:
[0083]
[0084] In the formula, b is the section width; y n is the distance between the neutral axis of the cracked section and the edge of the concrete ...
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