海洋冻融环境下隔震支座橡胶材料性能及其 Mooney-Rivlin 模型参数研究

In order to study the deterioration law of rubber isolation bearings under the action of marine freeze-thaw cycles, marine freeze-thaw cycle tests and mechanical property tests were carried out on the rubber materials of the bearings. The deterioration laws of hardness, stress at definite elongation and elongation at break of rubber material under the seawater freeze-thaw cycles were analyzed. The time-varying law of Mooney-Rivlin constitutive model parameters under the action of seawater freeze-thaw cycles was also revealed. The finite element analysis of the mechanical properties of the rubber isolation bearing was carried out by using the time-varying constitutive model parameters of rubber material, and the test and simulation values of the horizontal and vertical stiffness of bearing were compared to verify the correctness of the proposed time-varying constitutive parameters of rubber material. The results show the appearance of rubber material does not change significantly under the action of seawater freeze-thaw cycle test. The hardness ratio increases exponentially with the test duration. The elongation at break decreases exponentially with the test duration. The constant elongation stress increases with the test duration, and the greater the elongation, the greater the increase of tensile strain. The parameter C₁₀ of rubber material Mooney-Rivlin model increases exponentially with test duration, while C₀₁ decreases linearly. The correctness of the proposed time-varying constitutive parameters of rubber material is verified by comparing the finite element simulation values of the horizontal and vertical stiffness of the bearing with the test values.