Numerical Analysis on RC Slab Culvert Rehabilitated with Corrugated Steel Semi-circular Arch
In order to probe into the mechanical properties of the reinforced concrete(RC)slab culvert rehabilitated with corrugated steel semi-circular arch,the method for mutual verification between laboratory test and numerical analysis is adopted.On the basis of proposing and verifying the numerical analysis method for the RC slab culvert rehabilitated with corrugated steel semi-circular arch based on elasto-plastic equivalence of grout,the major factors affecting the bearing capacity of the reinforcement system are analyzed.The result shows that(1)The system transformation of reinforced concrete culvert takes place after reinforcement,the slabs change from flexural members before reinforcement to composite members with arch effect after reinforcement,and the failure mode shifts from the flexural failure before reinforcement to the shear failure after reinforcement.The ultimate bearing capacity of the reinforcement system depends on the shear capacity of the RC slab,the shear bearing capacity of the filled concrete and the bending capacity of the corrugated steel.The bending capacity of the RC slab,which has limited effect on the reinforcement system,mainly plays its shear bearing capacity.(2)The ultimate carrying capacity of the reinforcement system is 13.23 times higher than the theoretical ultimate carrying capacity of the slab before the reinforcement,presenting obvious reinforcement effect.(3)The maximum displacement and relative error of the reinforcement system are 16.27％and 0.191 7％respectively,and it is favorable to adopt the elasto-plastic equivalent method for the filled concrete to establish numerical model to simulate the bearing capacity and deformation of the reinforcement system in the ultimate state.(4)Meanwhile,the slab thickness,filled concrete strength and corrugated steel waveform are the key parameters affecting the reinforcement system bearing capacity,among which the filled concrete strength,followed by the slab thickness,has the greatest influence on the bearing capacity of the reinforcement system,and the selection of the corrugated steel waveform needs to balance the bending capacity of the corrugated steel and the shear bearing capacity of the filled concrete.
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