The Research O N Shear Strength Of Reinforced Concrete Composite Structure In Freshwater Whart

This paper analyzed and verified that the reason of composite structure behavior differing from general concrete structure is two-stage manufacture and load. After the second concreting the stress of the first loads was leaved in prefab component forever and redistributed on section with the second loads. The influence of two concrete intensities and the location of loads on ultimate shear strength was analyzed. And through the experimental investigation on the shear-resisting behavior of composite slab in freshwater wharf the shear performance and devastating behavior under concentrated loads was researched. Based on theoretic analyses and experimental investigation, a finite element model was established to simulate the process of shear strength redistribution on rectangular section beams. The program adopted separate model, with hexahedron element simulating concrete and staff element simulating the rebar. At the first, applying the first loads on the composite plane and killing the element of the second concrete and rebar, the stress in prefab beam can be solved. Then waking the killed element, applying the second loads and the stress in prefab beams as loads on the beam, the stress under the second load in the composite beam can be solved. The result of finite element method calculated accord with experimental result all right. The program calculated the shear strengths of composite beams with different compounding of two-stage concrete stiffness and some kinds height of section. It was found that the relation in concrete stiffness and section's depth and the calculating formula of converting concrete stiffness. Though the same method, the influence of different proportioning of span and section's depth with the first and second concentrated loads on ultimate shear strength was calculated. The calculating result indicated that enhancing the first load's proportioning of span and section's depth will weaken the shear strength. This paper offered the formula of converting proportion. Synthetically considering the concrete stiffness and the proportioning of span and beam depth, the formula of ultimate shear strength can accurately calculate the shear resistance on reinforced concrete composite structure. In the end some structural measure adapting the freshwater wharf and idiographic recommendatory project was advised. The first project was accepted.