Strengthened By Cfrp Prestressed Concrete Hollow Slab Bridge Carrying Capacity Studies

The bridge is transportation's pharynx and larynx, which guaranteed the entire transportion line unimpeded. As for the bridges can not satisfy the operation requirements, the effective reinforcement measure should be taken to make the reinforcement transformation, enhance the bridge bearing capacity, prolong its service life, which has the important economy and the social values. The assembly type prestressed concrete hollow plank bridge is commonly used style in the small and middle span bridges, Thus, the research on the carbon fiber cloth reinforcement hollow plank bridge's technology has the important theory and industry values.This article uses finite element software Midas/FEA, has carried on the value simulation analysis to the ordinary carbon fiber cloth and the pre-stressed carbon fiber cloth reinforcement prestressed concrete hollow plank bridge's supporting capacity, completes the prime task and obtains four main conclusions:1. The ordinary carbon fiber cloth and the pre-stressed carbon fiber cloth were used to reinforce prestressed concrete hollow plank bridge, this reduced the spatial core's steel stranded wire, the concrete stress and the spatial core's amount of deflection. The crack extension was obviously reduced, although crack quantity increased. Compared with the spatial core ordinary carbon fiber cloth, the stress that the pre-stressed carbon fiber cloth undertakes increases obviously.2. Uses the pre-stressed carbon fiber cloth reinforcement hollow plank bridge, because carbon fiber cloth before spatial core stress had great strain, when the core starts in the sky withstands the live load function, the carbon fiber cloth may immediately participation works and displays greatly affects, is opposite in the ordinary carbon fiber cloth, the pre-stressed carbon fiber cloth high strength superiority can display.3. Obtains around the spatial core reinforcement load coefficient ~ steel stranded wire, the carbon fiber cloth strain curve by the carbon fiber cloth reinforcement prestressed concrete hollow plank bridge's limit supporting capacity value simulation to be possible to know, before the steel stranded wire submits, the carbon fiber cloth and the steel stranded wire strain increases along with the load increases, the two common stress; after the steel stranded wire submits, the carbon fiber cloth's function is more remarkable.4. The ordinary carbon fiber cloth and the pre-stressed carbon fiber cloth reinforcement prestressed concrete hollow plank bridge's limit supporting capacity value simulation result indicated that the two methods can both enhance the hollow board to submit the load, the ultimate load, regarding the limit supporting capacity, the pre-stressed carbon fiber cloth reinforcement enhances in a big way compared to the ordinary carbon fiber cloth reinforcement.