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.
Highlights
Prestressed high-strength concrete piles (PHC piles) have the advantages of low cost, high bearing capacity, high concrete strength, quick speed of construction, and good reliability; prestressed high-strength concrete (PHC) piles have been widely used in Asian countries, such as Japan, China, and South Korea, and more than two hundred million meters of PHC piles are applied in engineering every year in China. e pile foundation needs to undertake the vertical load of the upper structure and horizontal force when subjected to earthquake
Nagae et al [8, 9] conducted cyclic test on prestressed reinforced concrete pile (PRC pile) and considered the effect of axial deformed bars and lateral reinforcement on the seismic performance of PRC piles. e test result showed that PRC piles can exhibit stable hysteretic behavior and significant ductility when properly reinforced with axial deformed bars and lateral reinforcement. e test result of Akiyama et al [10] showed that the prestressed reinforced concrete pile with carbon-fiber sheets and infilled concrete had a much higher flexural bearing capacity than conventional precast concrete pile
Yang et al [13,14,15] conducted cyclic tests and finite element analysis to study the parameters of different types of pile, stirrup ratio, filling-concrete, steel fiber, and Advances in Materials Science and Engineering deformed steel bar on the seismic performance of PHC pile. e test results showed that the PHC piles were damaged by bending. e bearing capacity and ductility of PHC pile increased with the reinforcement ratio of prestressing tendon
Summary
Prestressed high-strength concrete piles (PHC piles) have the advantages of low cost, high bearing capacity, high concrete strength, quick speed of construction, and good reliability; PHC piles have been widely used in Asian countries, such as Japan, China, and South Korea, and more than two hundred million meters of PHC piles are applied in engineering every year in China. e pile foundation needs to undertake the vertical load of the upper structure and horizontal force when subjected to earthquake. Sasaki et al [24] used unbonded round steel bars with anchor plates to improve the performance of semirigid connections on pile heads by reducing the stress on pile heads and decreasing the cost of foundation works. It showed that the connection developed retains its bending capacity at rotational angles of less than 1/20 radian. Wang et al and Yang and Wang [28, 29] studied six PHC pile-pile cap connections under cyclic loading; the test result showed that the specimens exhibit flexural failure, and the bearing capacity and energy dissipation capacity increased along with the rotation capacity of the pile connections. To avoid the damage of end of PHC near pilepile cap connection, three improved PHC pile-pile cap connections were studied by test and finite element analysis
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