Excessive prestress loss in Prestressed Concrete (PC for short) continuous beam bridges and continuous rigid frame bridges cause structures to be different types of diseases. Based on theoretical analysis and experiment , this paper points out the imperfection of the effective prestress formula in Curving Hole at present. According to the research on the influencing factor of prestressed loss in Curving Hole of friction coefficient, it plays a remarkable role on the analysis about the prestressed loss in Curving Hole of prestressed concrete structure.

Excessive prestressed loss in prestressed concrete continuous beam bridge and continuous rigid frame bridge causes structures appearing different types of diseases. By theoretical analysis on computational expression of effective prestress in curving hole, and distribution of contact stress and experiment about prestressed loss caused by frictional resistance, this paper points out the disadvantages of current effective prestress formula in curving hole. According to the research on the major influencing factors of prestressed loss in curving hole-contact status and friction coefficient μ, it plays a remarkable role on the further analysis of prestressed loss in curving hole.

The pre-stressed friction loss formula in bending channel recommended by Bridge Rules was based on the uniform distribution hypothesis of contact pressure. From some conflicts in application of the formula, the non-uniform distribution law of the contact pressure was revealed. On the basis of elastic contact analysis, two types of non-uniform distribution hypothesis were proposed, including cosine and second-degree parabola distribution. Then the contact positive pressure expressions were derived respectively and the frictional resistance was calculated to compare with the calculated value under the uniform distribution. The results indicate that the friction resistance under any non-uniform distribution of positive pressure is less than under the uniform distribution. So the uniform distribution assumption of contact pressure does not cause Bridge Specifications formula underestimate friction loss. It is necessary to do further research on the applicability of Coulomb’s law under the contact conditions in the curved channel.

In ship dynamics research field, large ship moving on sea water is a hot research project of water transportation. The fluidsolid coupling dynamics model of large ship is built by using time-dependent solid dynamics theory and fluid dynamics theory of ship. The linear analysis solution formula of ship deformation is obtained from the linear fluid-solid coupling equation. The hull displacements are obtained and the maximal displacement is found when the wave-hull resonance number becomes an integer.