Mechanical Mechanism Analysis of the Diseases of the Circular Rubber Bearing of the Bridge

Rubber is a super-elastic material. Super-elasticity can be used to analyze rubber-like materials. This material can withstand large strains and large displacements, but has minimal volume change (incompressible), and has two characteristics: material nonlinearity and geometric nonlinearity. In the research process, the positive pressure, shear force and void of the circular rubber bearing were analyzed. For the circular bearing, it can be found through research that the tensile stress of the rubber layer of the rubber bearing increases rapidly with the increase of the vacant area of the bearing, and the slope of the curve is also increasing. The maximum stress of the rubber layer generally appears between the upper first layer of steel plate and the second layer of steel plate. When the void area reaches 30%, the tensile stress of the rubber layer between the first layer of steel plate and the second layer of steel plate reaches 32.8MPa, which is greater than the specified 17MPa, which causes the cracking and deterioration of the inner rubber layer of the bearing, and finally leads to the rubber support. Because of the collapse of the seat, the vacancy of the seat must be paid attention to in the design and construction process.

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