Calculation of cracking moment in flexural concrete members;

Calculation of normal section crack resistance of prestressed concrete composite beams with U-shaped precast beam;

Based on the analysis of stress and strain on precast beam section at manufacturing, transporting and assembling stages and composite beam section at using stage, calculating methods of normal section crack resistance at corresponding stage are presented by usng the elastic theory, which lays a foundation for subsequent experimental study and appli.

The crack-resistant capacity performance of RPC beam hadn t been researched systematically at present,and the effects of the steel fiber added on the plastic deformation of the RPC tension region hadn t been studied deeply.

To work out the positive section bend strength of this framework, it applies an equivalent fictile extent measure, which can be covered in the related theoretical research, to calculating the ultimate stress.