Study on Seismic Performance of Improved High‐Strength Concrete Pipe‐Pile Cap Connection

Abstract

Four prestressed high-strength concrete pile- (PHC pile-) pile cap connections under low-cycle loading were tested to study the test phenomena, failure modes, hysteretic performance, ductility, and bearing capacity. The PHC piles were reinforced with steel fiber and deformed bars and CFRP. The tests results showed that the connections were damaged by bending. The concrete of the caps were squeezed to be crushed. The concrete of connection was crushed and formed a hinge joint that resulted in the connection rotating unrestricted, and the rotation capacity of connection increased. The PHC pile reinforced with steel fiber and deformed bars can improve the displacement ductility of the connections. The finite element software ABAQUS was used to simulate the nonlinear behavior of pile-cap connections. The prediction agreed relatively well with the experimental results. The stress and strain of specimens were studied. The connections should be designed with enough rotating capacity and make sure the cap will not be damaged by squeezing or prying due to the rotation of pile end.

Bearing Performance of Prestressed High-Strength Concrete Pipe Pile Cap Connections under Truncated Pile Conditions

“…Guo et al [16,17], He et al [18,19], Yang et al [20,21] and Wang et al [22] analyzed the bearing performance of PHC pipe piles and cap joints by using full-scale tests and numerical simulation methods. Reference [16] proposed a formula for the calculation of the bearing capacity of PHC pipe piles and cap joints under horizontal earthquake action.…”

Bearing Performance of Prestressed High-Strength Concrete Pipe Pile Cap Connections under Truncated Pile Conditions

“…Zhaosheng Guo et al [16,17], Wubin He et al [18,19], Zhijian Yang et al [20,21] and Tiecheng Wang et al [22] analyzed the bearing performance of PHC pipe piles and cap joints by using full-scale tests and numerical simulation methods. Reference [16] proposed a formula for calculating the bearing capacity of PHC pipe piles and cap joints under horizontal earthquake action.…”

Numerical Study of Strengthened Spun Pile with Concrete Infill and Steel Jacket

“…A study of spun pile-to-pile cap connections with different connections has been conducted in China [5][6]. An experimental study of four full-scale specimens with other improved connections, such as those reinforced with steel bars, steel fiber-reinforced, and CFRP (carbon fiber-reinforced polymer), showed higher ductility with improved connections with steel fiber CFRP was achieved and compared with a normal specimen with no improvement [5].…”