Analysis of the Mechanical Performance of Polyester Fiber Reinforced Concrete Zero Block in a Continuous Rigid Frame Bridge
To investigate the spatial stress distribution of the 0#block in a continuous rigid frame bridge constructed with polyester fiber-reinforced concrete,based on the backdrop of a similar bridge located in Pipa Zhou,Jiangxi Province,a comprehensive finite element model of the entire bridge and a solid model of 0#block are established.The accuracy of the model is verified by comparing the mo-nitoring stress of key cross-section stresses during the construction process.Subsequently,the stress variations in 0#block box girder are analyzed under maximum cantilever and completed bridge states.The findings reveal that,under both conditions,the application of polyester fibers results in consist-ent stress distribution and uniform stress patterns in the top and bottom plates of the 0#block.The top plate stress variations range is within 2.5 MPa,while the bottom plate experiences variations of approximately 1 MPa.Furthermore,the presence of tensile stress is observed in parts of transverse diaphragms of the box girder,with the maximum tensile stress reaching 0.305 MPa,indicating the need for enhanced reinforcement in these diaphragm locations.
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