|
Title |
Pile-cap Connection Behavior between Hollow-Head Precast Reinforced Concrete Pile and Foundation
|
|
Authors |
방진욱(Jin-Wook Bang) ; 조영재(Young-Jae Jo) ; 안경철(Kyung-Chul Ahn) ; 김윤용(Yun-Yong Kim) |
|
DOI |
https://doi.org/10.11112/jksmi.2019.23.1.71 |
|
Keywords |
기초접합부 ; 반복가력 ; 하중-변위 곡선 ; 강성감소 ; 누적에너지소산 Pile-cap ; Cyclic load ; Load-displacement curve ; Stiffness degradation ; Cumulative dissipated energy |
|
Abstract |
Recently, most of the pile foundations have been applied as a method to transfer the heavy load of the structure to the ground with high bearing capacity. In this study, the pile-cap behavior between foundation and hollow-head precast reinforced concrete(HPC) pile reinforced with longitudinal rebar and filling concrete was experimentally evaluated depending on the cyclic load and reinforcement ratio. As the drift ratio increases, it was found that the cracks pattern and fracture behavior of two types of pile-cap specimens according to the reinforcement ratio were evaluated to be similar. As the reinforcement ratio increases by 1.77 times, the BS-H25 specimen increases the maximum load by 1.47 times compared to the BS-H19 specimen. However, the ductility ratio of positive and negative was decreased by 76% and 70% respectively. After the yielding of the pile-cap reinforcing rebars, the positive and negative stiffness of the all specimens were decreased by a range from 66% to 71% and a range from 54% to 57% respectively, and the average stiffness of BS-H25 specimen is 13% higher than that of BS-H19 specimen. The cumulative dissipated energy capacity of BS-H19 and BS-H25 specimen under ultimate load state is 5.5 times and 6.6 times higher than that of service load state.
|