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为研究矩形板式天然橡胶支座在不同冻融循环次数情况下的轴压性能,利用冻融试验箱,首先对5个试件分别进行25次、50次、75次、100次和150次高低温交变冻融循环,然后对冻融循环后的试件进行轴压性能试验,对试验后的试件外观、极限承载力、极限抗压强度、竖向刚度和抗压弹性模量进行对比分析.实验结果表明:随着冻融循环次数的增多,矩形板式天然橡胶支座试件的变形越大,橡胶层开裂现象越严重,极限抗压强度和抗压弹性模量下降越快.利用试验结果和最小二乘法给出的极限抗压强度及抗压弹性模量的衰减模型基本符合指数函数规律.
In order to study the axial compression performance of rectangular plate natural rubber bearing under different freezing and thawing cycles, five specimens were first subjected to 25 times, 50 times, 75 times, 100 times and 150 times respectively After cold-thaw cycles, the axial compression properties of the specimens after the freeze-thaw cycles were tested. The appearance, ultimate bearing capacity, ultimate compressive strength, vertical stiffness and compressive elastic modulus of the specimens after the test were compared The experimental results show that with the increase of the number of freeze-thaw cycles, the deformation of the rectangular plate natural rubber bearing specimen is more serious, the more serious the rubber layer cracking phenomenon, the faster the ultimate compressive strength and compressive elastic modulus decrease. The results of the test and the least square method give the ultimate compressive strength and compressive modulus of elasticity of the attenuation model basically in line with the law of exponential function.