The Durability Research Of Basalt Fiber Reinforced Concrete Continuous Beam Fatigue And Freeze-thaw

Bridge engineering is one of the important throat of roads and railways, ensure that its bearing capacity and normal use performance is the key to all run smooth. Currently,more and more bridges have reach the use fixed number of year. Reinforcement to bridge is applied more and more to reduce the economic costs and environmental pollution.As a kind of new material BFRP is gradually replace CFRP used in the structure reinforcement, which has excellent properties, such as good extensibility, high temperature resistant, corrosion resistance, fatigue resistance and low price. However the research of BFRP reinforcement structure mainly concentrated in the experimental section at present. This topic from the perspective of the theory analysis, using the method of numerical simulation, using ABAQUS to establish finite element model of reinforced concrete continuous beam. FE- SAFE simulated and analyzed fatigue life of BFRP strengthening reinforced concrete continuous beam and the fatigue performance of concrete continuous beam under the condition of freezing and thawing. Basalt fiber reinforced concrete continuous beam fatigue has been effectively improved by computation analysis. And sum up key points and difficulties of numerical model that established. Analyzed the BFRP reinforcement thickness, u-shaped hoop reinforcement effect of model parameters on the BFRP reinforcement beam components affect the situation. The main work of the article studies is as follows:1、Based on the flat section assumption, no bond slip assumption and unbonded stripping damage assumption to use the finite element software ABAQUS to simulated fatigue performance of reinforced concrete beams on the basis of the finite element model. This paper analyzes the changes of neutral axis of concrete beam under different stress repeated load, steel reinforced strain distribution under a certain cycles, the load-strain curve of reinforced and the strain, deflection of concrete. Comparing the calculation results with test results to verify the correctness of the finite element simulation.2、By using FE-SAFE software to analyze life-span of concrete beam. It can be seen compared with the unreinforced concrete beams according to the reinforcement layers have different degrees of improvement..3 、 Temperature field was used to simulate freezing-thawing circumstance and temperature field coupled with fatigue. It is concluded that freezing and thawing environment can have an adverse effect on the fatigue life of concrete beam. The fatigue life of reinforced concrete beam are improved significantly with BFRP. The life reduced only under the fatigue load with the increase of reinforcement layers.