Calculation method of restoring force model of prefabricated concrete piers confined by square steel tubes

Subjects: Mechanics >> Other Disciplines of Mechanics submitted time 2024-06-17 Cooperative journals: 《应用力学学报》

OU Zhijing

Abstract： The ABAQUS general finite element software is used to model concrete bridge piers constrained by assembled square steel tubes and calculate the load-displacement hysteresis curve and skeleton curve characteristics of the bridge piers.Axial compression ratio,slenderness ratio,confinement coefficient,yield strength of square steel tube,concrete strength,ratio of embedded depth of steel tube to side length of pier,and ratio of diameter of nested steel tube to side length of pier,and ratio of thickness of nested steel tube to side length of pier are taken as extended parameters.The influences of various parameters on the load-displacement skeleton curve of the concrete bridge piers confined by assembled square steel tubes are studied.Referring to the calculation framework of steel tube confined reinforced concrete column,the calculation formula of each characteristic value(elastic stiffness,horizontal load peak,peak load displacement and descending segment stiffness)of concrete piers confined by prefabricated square steel tubes is fitted.The calculation formula is in good agreement with the results of finite element analysis.The average value of the ratio between the finite element analysis value and the calculated value of the formula is 1.004～1.035,and the mean square error is 0.133～0.162.The actual project is selected to verify the algorithm.The calculation results are in good agreement with the finite element value.

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