Abstract：Considering the high-rise building which is supported by piled raft foundation with PHC pipe piles in layered soft soils of Tianjin, a structure-pile-layer soil model was built using finite element method to ascertain seismic performance of the piles. The research shows that the piles around the corner of the pile group suffer larger internal force under earthquake load. Reducing the constraint of cap on pile top at rotational degree of freedom can effectively improve the seismic performance of PHC piles. The structure with basement generates lower internal force of pile top than the structure without basement during the earthquake, and the influence zone of basement is in the range of 10 times of pile diameter from the pile top. Besides, the PHC pipe piles with soft soil layer around the top suffer larger internal force under seismic load. Both the effect of basement and soft soil layer around pile top should be considered in the foundation design. Only considering the influence of the basement is likely to make the pile under adverse stress state during earthquake. Improving the soil properties around pile top can reduce the internal force of top of the PHC pipe piles under earthquake load significantly.
戴 轩 郑 刚 张 楠 刘景锦. 成层软土地区高层建筑PHC管桩抗震性能研究#br#[J]. 土木工程学报, 2019, 52(S1): 248-256.
Dai Xuan Zheng Gang Zhang Nan Liu Jingjin. Seismic performance of PHC pipe piles of high-rise building in layered soft soils. 土木工程学报, 2019, 52(S1): 248-256.
