Plastic Hinge Length of UHPC-NC Hybrid Pier Reinforced by High-strength Steel Bars

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Plastic Hinge Length of UHPC-NC Hybrid Pier Reinforced by High-strength Steel Bars

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[1]REN Liang,LIU Qingyun,FANG Bowen,et al.Plastic Hinge Length of UHPC-NC Hybrid Pier Reinforced by High-strength Steel Bars[J].Journal of Zhengzhou University (Engineering Science),2023,44(06):119-126.[doi:10.13705/j.issn.1671-6833.2023.03.016]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 06 Page number: 119-126 Column: Public date: 2023-12-25

Title:: Plastic Hinge Length of UHPC-NC Hybrid Pier Reinforced by High-strength Steel Bars

Author(s):: REN Liang; LIU Qingyun; FANG Bowen; WEN Shuai; 1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China; 2. State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China

Keywords:: plastic deformation ability; UHPC-NC hybrid pier; ABAQUS; high-strength steel bars; plastic hinge length; ductility analysis model

CLC:: TU377；U24

DOI:: 10.13705/j.issn.1671-6833.2023.03.016

Abstract:: To discuss the plastic deformation ability of UHPC-NC hybrid pier reinforced by high-strength steel bars, a ductility analysis model was established and calibrated by the corresponding pseudo-static test of concrete piers strengthened with different UHPC reinforcement heights and UHPC box piers with different loading angles, with the involving in the constitutive model of Mander and double line, the constitutive relationship of UHPC material and the damage plastic model of concrete in the finite element program ABAQUS. Based on the validation of the test results, the method on determining the length of the plastic zone was proposed, and the parameter analysis varying in the axial compression ratio, the diameter and yield strength of the longitudinal reinforcement, and the height of the specimen was conducted. On the basis of the applicability of the proposed formula in the evaluating code, the formula for calculating the equivalent plastic hinge length of hybrid pier was established. The results showed that, the length of plastic zone for UHPC-NC hybrid pier reinforced by high-strength steel bars would decrease with the increase of axial compression ratio, increased firstly and then decreased with the diameter of the longitudinal reinforcement and longitudinal reinforcement yield strength, and increased with the increase of the specimen height. When the axial compression ratio was close to 0. 5, the failure of UHPC occurred simultaneously with the yield of longitudinal bars in the tensile zone. When the longitudinal reinforcement diameter and yield strength were 16 mm and 500 MPa, the energy dissipation capacity of the plastic zone reached the optimum. By comparing with the numerical analysis results, it was further shown that the empirical formulas underestimated the plastic deformation ability of UHPC-NC hybrid pier. The established equivalent plastic hinge regression formula could provide a reference for the seismic research of UHPC-NC hybrid pier reinforced by high-strength steel bars.

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Last Update: 2023-10-22