Shear tests of plain chloroprene rubber bearings of highway bridge under thermal aging condition
1.School of Civil Engineering, Shenyang Jianzhu University, Shenyang, Liaoning 110168, China; 2.Supervision and Inspection Institute of Building Material in Liaoning Province, Shenyang, Liaoning 110032, China; 3.Chongqing Highway Engineering Quality Inspection Center, Chongqing 400060, China; 4.Chongqing Communications Construction Group, Chongqing 401147, China
Abstract：The thermal aging process was simulated by the high temperature chamber. The plain chloroprene rubber bearings were processed by thermal aging treatment for 20,40,60 or 80 days, and then the shear tests were conducted. Compared with the standard piece, the impacts of thermal aging treatment on shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness and shear elastic modulus were investigated. The test results show that the plain chloroprene rubber bearings are more prone to brittle failure under thermal aging treatment than the standard piece, and the shear failure of plate exposure, lamellar damage and cracks are more serious. The shear carrying capacity, ultimate shear strength, horizontal equivalent stiffness and shear elastic modulus of plain chloroprene rubber bearings are decreased with the increase of thermal aging degree. The shear strength and compressive elastic modulus for 50 years were investigated by the least squares method. According to the decay curve and the attenuation function, the trend is consistent with the law of exponential function.
2013, Vol. 34 
