A method for predicting prestress loss after cracking of concrete reinforcement
A concrete and prestressed technology, applied in the direction of measuring devices, special data processing applications, instruments, etc., to achieve reliable calculation results
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[0059] The invention discloses a method for predicting the prestress loss of concrete after cracking along the reinforcement, including the following steps:
[0060] (1) Predict rust swelling and cracking of concrete: According to the basic size of the component, determine the value of the geometric parameters, and use the thick-walled thin tube theory to simulate the rust swelling and cracking of concrete. The binding force of cracked concrete predicts the rust swelling force;
[0061] (2) Analysis of the degradation of the bond strength of the corroded steel strand: establish the expressions of the adhesive force, binding force and rust expansion force between the steel strand and the concrete interface, analyze the influence of the corrosion of the steel strand on the above factors, and then calculate the corrosion of the steel strand strand bond strength;
[0062] (3) Evaluate the loss of prestress caused by corrosion: discretize the pre-tensioned concrete member into mul...
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