Abstract
An artificially accelerated alternation of aging and seawater erosion test of rubber materials used in lead rubber bearing (LRB) was performed, mainly to study the time-varying laws of rubber materials mechanical properties. Time-varying laws of the Mooney–Rivlin and Neo-Hookean constitutive parameters of rubber materials under the alternation of aging and seawater erosion were also analyzed. Results indicate that the rubber material mechanical properties were significantly affected by alternation of aging and seawater erosion. Hardness and elongation stress increased exponentially with test time. And 120 days after the test, the hardness increased by 14%, the maximum percentage increase in stress of 124.76% occurred at 100% constant elongation and the minimum percentage increase in stress of 68.32% occurred at 300% constant elongation; Tensile strength and elongation at break decreased by 44.96% and 53.09%. Besides, constitutive parameters of Mooney–Rivlin and Neo-Hookean all changed greatly with test duration. Finally, time-varying laws of constitutive parameters were verified by comparing the simulated and experimental results of the lead rubber bearing’s stiffness. Research results are of great significance to the seismic performance research and life-cycle performance analysis of offshore traffic engineering such as cross-sea bridges and bridges in the marine environment.
Highlights
Considering the longterm complex and harsh marine corrosion environment in which offshore engineering structures, such as sea-crossing bridges, are built, the performance of the rubber isolation bearing used in these structures would degrade which will affect the seismic performance of the structures in which they are used
5.2 Validation of Neo-Hookean Constitutive Parameter According to the obtained time-varying law given by formula (4), the Neo-Hookean constitutive parameter corresponding to various durations of the alternation of aging and seawater erosion were calculated and substituted into the finite-element model to analyse the performance of the lead rubber bearing
A 120-day alternation of aging and seawater erosion test was carried out on the rubber material used in lead rubber isolation bearings
Summary
With the rapid development of China’s economy, seismic isolation and reduction technologies have been used in the construction of sea-spanning bridges and other offshore transportation projects. Ma et al [9,10] studied the performance degradation law of NR materials and high-damping rubber materials under aging, sea erosion and seawater dry-wet cycles. Their results showed that these factors considerably influence the hardening of rubber materials and the deterioration of its mechanical properties. Ma et al [19] calculated and analysed the time-varying law of the Mooney–Rivlin constitutive parameters of NR material based on the degradation test results of NR material under aging, sea erosion and seawater drywet cycles. The time-varying law of the material properties and the constitutive parameters of the rubber material used in lead rubber bearing (LRB) under the alternating action of aging and seawater erosion are studied
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