Experimental Study On The Statics Mechanical Property Of FRP Composite Beam Specimen

Composite girder bridge is based on the overall cast-in-place reinforced concrete and precast reinforced concrete of new bridge form, fully combines the characteristics of two Bridges forms. FRP composite girder bridge with FRP materials as a permanent template, after pouring concrete on its template, to reduce labor, reduce the project cost, to speed up the construction progress has a positive role, but the interface bonding strength is the basis of the joint force.In the second chapter of FRP material and after pouring concrete composite structure with the ordinary concrete generally analyzing the damage of the bending test. Composite structure of FRP material and after pouring concrete mechanical properties than those of normal concrete is improved, the composite structure of flexural bearing capacity and deflection is obvious higher than that of ordinary concrete specimen, and the composite structure of stripped damage to two kinds of materials, concrete crushed FRP materials not damage, however, and did not give full play to the characteristics of high tensile strength of FRP materials is given priority to, the reason for the conclusion of weak interlayer binding strength. Third chapter in the experimental study of peel strength in the second chapter conclusion on the basis of the interface between the two, respectively adopted different ways to increase the interface bonding strength, using stick coarse sand, epoxy glue, shear key method and synthetic method of FRP materials bonding surface processing, and then within the template after pouring concrete for the experimental study of stripping interface, through experimental study on two kinds of material interface bonding failure forms and characteristics, it is concluded that combination of specimen failure modes are mainly the middle fracture extension of its destruction, oblique fracture propagation caused by damage, concrete specimen ends its destruction, at the bottom of the specimen concrete destruction of four forms. Consider adding PVA fiber, basalt fiber in the concrete, steel wire net to improve the mechanical performance of concrete itself to study the effect of the folding strength composite components and interface stripping damage forms. Interface bond strength was increased composite specimens and to improve the strength of concrete on the peel strength and flexural strength of the specimens were significantly improved. In the FRP plate adopts the synthetic method is the best way of processing. The fourth chapter of GFRP post-cast concrete box girder and the combination of structure used in a variety of assumptions to simplify the calculation, by elastic damage calculation and analysis and limit damage form, providing theoretical basis for the design of composite beams. In the fifth chapter USES the GFRP tube box and after pouring concrete box beam to simulate the GFRP and concrete composite beam structure experiment analysis, respectively, at the top of the box girder made by synthesis processing and embedded in the concrete steel wire nets and join basalt fiber in concrete and untreated combination structure of the specimen, specimen for bending test, according to the test process and damage characteristics of two kinds of specimens, the clear pure GFRP box beam under load will produce larger deformation, failed to play a high compressive strength of concrete and the characteristics of GFRP material tensile strength high, mainly due to the shear strength GFRP materials and GFRP box girder stiffness of low reason, and put forward to increase GFRP box beam shear strength and bending stiffness.