Comparative Experimental Study on Dynamic Interaction of Piles-Soil-Steel and Piles-Soil-Concrete Structures
To analyze the laws of different superstructure interaction of piles-soil,the shaking table comparative tests of piles-soil steel frame structure model and piles-soil concrete structure model were carried out respectively,and the corresponding finite element numer-ical simulation analysis of the test models was carried out.The three-dimensional laminated shear model container is used in the test,in which the soil is uniform silty clay,the steel structure and concrete structure model are simplified three-layer frame structures,the pile foundation is 3x3 pile groups,the pile diameter is 10 cm,and the pile length is 200 cm.The input is the artificial ground motion time history,which is compressed by one-fifth according to the time similarity ratio.The results of shaking table comparison test show that the overall stiffness of concrete structure is higher than that of steel structure for the same geometric dimensions structure test model,so the vibration frequency is higher than that of steel structure.Under the same earthquake action,the acceleration response of steel frame structure model is obviously greater than that of concrete structure,and the predominant period of steel frame structure model response spectrum is relatively longer.To be specific,the acceleration amplification factor of the pile shaft in the former is 1.15-1.2 times of the latter,and that of the superstructure can reach as high as 2 times.The results of finite element numerical simulation qualitatively verify the rationality of the test results.
Steel structureConcrete structurePile foundationShaking table testInteraction of piles with soil
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