Research on mechanical properties of laminated neoprene bridge bearing pads under thermal aging condition

Yannian Zhang, Chunhong Shan, Qingjie Wang

Abstract


The present study was conducted to obtain a better understanding of the variation rule of mechanical properties of laminated neoprene bridge bearing pads under thermal aging condition using compression tests and shear tests. A total of 10 specimens were processed in a high-temperature chamber. After that, five specimens were tested subjected to axial load and another five specimens were tested subjected to combined axial and horizontal loads. The parameter mainly considered time of thermal aging processing for specimens. The results of compression tests and shear tests both show that the specimens after thermal aging
processing are more probably brittle failure than the standard specimen. Moreover, the exposure of steel plate, cracks and other failure phenomena are more serious than the standard specimen. The compressive capacity, ultimate compressive strength, compressive elastic modulus, shear capacity, ultimate shear strength and shear elastic modulus of the laminated neoprene bridge bearing pads decreased dramatically with the increasing in the aging time of thermal aging processing. Thermal aging processing has a greater effect on horizontal equivalent stiffness than vertical stiffness. The attenuation trends of ultimate compressive strength, ultimate shear strength, compressive elastic modulus and shear modulus of laminated neoprene bridge bearing pads under thermal aging condition accord with power function. The attenuation models are acquired by regressing data of experiment with the least square method. The attenuation models conform to reality well which shows that this model is applicable and has vast prospect in assessing the performance of laminated neoprene bridge bearing pads under thermal aging condition.


Keywords


bridge bearing pads; thermal aging; compression tests; shear tests; compressive capacity; shear capacity

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