Experimental study on the seismic behavior of new PHC piles
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ORIGINAL PAPER
Experimental study on the seismic behavior of new PHC piles Xiaolin Cao 1,2 & Guoliang Dai 1,2 & Weiming Gong 1,2 & Mingxing Zhu 1,2 & Jianan Tang 1,2 Received: 18 May 2020 / Accepted: 30 July 2020 # Saudi Society for Geosciences 2020
Abstract In order to improve the bearing characteristics of prestressed high-strength concrete (PHC) piles, this paper proposes the use of steel strands and steel bars instead of steel reinforcement for PHC piles or PHC piles wrapped in BFRP. Eight PHC piles were tested under low-cycle loading to study their seismic performance. Through the analysis of the test phenomena, hysteresis curve, skeleton curve, strength and stiffness degradation, ductility and energy dissipation, it is found that the bearing capacity of the PHC pile coated with BFRP is much higher than that of the other types of piles. The PHC piles with steel bars and steel strands as the main reinforcement have the best seismic performance. ABAQUS was used to establish nonlinear finite element models. The results show that the experimental results are in good agreement with the finite element results. In addition, it is found that increasing the reinforcement ratio has no effect on improving the bending capacity of the PHC pile, while increasing the reinforcement ratio of the main reinforcement can improve the ultimate bending moment of the PHC pile. Keywords New PHC pile . Low-cycle loading . Seismic performance . Finite element analysis . Experimental study
Introduction PHC piles are widely used in engineering projects due to their advantages, such as their high carrying capacity, reliable pile quality, and wide application range. A large number of scholars have studied the mechanical properties, failure mechanisms, and design methods of PHC piles (Zhang et al. 2011; Liu and Li 2007; Liu et al. 2011). However, through the study of previous earthquakes in Japan, it was found that PHC piles were damaged in earthquake, and the main form of damage is bending damage (Yoshihiro et al. 2003; Masatoshi et al. 2012). To clarify the bearing characteristics of PHC piles under earthquake loads, the seismic analyses of PHC piles were carried out by experiments and finite element methods (Yang et al. 2018; Banerjee et al. 1987; Wang et al., 2014a, b; Au et al. 2011). Yang et al. (2018) studied the seismic Responsible Editor: Zeynal Abiddin Erguler * Guoliang Dai [email protected] 1
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China
2
School of Civil Engineering, Southeast University, Nanjing 210096, China
performance of PHC piles, in which PHC piles suddenly failed due to tensile fracture of the prestressed tendon and the bearing capacity decreased. Based on the laboratory test method, the seismic performance of PHC piles was studied by Banerjee et al. (1987). Based on test and FEA, Wang et al. (2014a, b) studied the seismic performance of PHC piles and evaluated their ductility and strength. The whole process for bending response o
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