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Experimental and Numerical Investigations of the Seismic Performance of UHPC Box Piers
Abstract Experimental studies and numerical simulations were carried out to assess the seismic performance of Ultra High Performance Concrete (UHPC) box piers. The mechanical performance of the specimens under constant axial load and reversed cyclic lateral load were tested at different loading conditions (different angles between applied load and the strong direction of the column cross section which is referred as Test Angle (TA) in this study). The failure mode, hysteretic characteristics, displacement ductility, energy dissipation and stiffness degradation were discussed. A UHPC hysterical constitutive model was proposed by incorporating the UHPC constitutive model and utilizing similar hysteretic rule and integrated into OpenSees. Quasi-static analysis which accounts for the bar slippage at the foot of pier was conducted. The acceptable agreement between the numerical analysis and experimental results proofs the validity of the modeling method. Furthermore, parametric analysis was performed to investigate the effect of axial load ratio, longitudinal reinforcement ratio and TA on the ductility of UHPC box piers. The results indicated that the ductility of UHPC box piers gradually decreases with the increase of longitudinal reinforcement ratio. TA significantly affects the ductility of UHPC box piers and the ductility is the minimum if the lateral loading direction is perpendicular to the diagonal of the cross-section.
Experimental and Numerical Investigations of the Seismic Performance of UHPC Box Piers
Abstract Experimental studies and numerical simulations were carried out to assess the seismic performance of Ultra High Performance Concrete (UHPC) box piers. The mechanical performance of the specimens under constant axial load and reversed cyclic lateral load were tested at different loading conditions (different angles between applied load and the strong direction of the column cross section which is referred as Test Angle (TA) in this study). The failure mode, hysteretic characteristics, displacement ductility, energy dissipation and stiffness degradation were discussed. A UHPC hysterical constitutive model was proposed by incorporating the UHPC constitutive model and utilizing similar hysteretic rule and integrated into OpenSees. Quasi-static analysis which accounts for the bar slippage at the foot of pier was conducted. The acceptable agreement between the numerical analysis and experimental results proofs the validity of the modeling method. Furthermore, parametric analysis was performed to investigate the effect of axial load ratio, longitudinal reinforcement ratio and TA on the ductility of UHPC box piers. The results indicated that the ductility of UHPC box piers gradually decreases with the increase of longitudinal reinforcement ratio. TA significantly affects the ductility of UHPC box piers and the ductility is the minimum if the lateral loading direction is perpendicular to the diagonal of the cross-section.
Experimental and Numerical Investigations of the Seismic Performance of UHPC Box Piers
Ren, Liang (author) / Fang, Zhi (author) / Zhong, Rui (author) / Wang, Kai (author)
KSCE Journal of Civil Engineering ; 23 ; 597-607
2018-12-17
11 pages
Article (Journal)
Electronic Resource
English
Experimental and Numerical Investigations of the Seismic Performance of UHPC Box Piers
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