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Experiment on Interaction of Prestressed Pile-soil in Integral Bridge(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年01期
Page:
31-40
Research Field:
Publishing date:

Info

Title:
Experiment on Interaction of Prestressed Pile-soil in Integral Bridge
Author(s):
HUANG Fu-yun1; 2;  HE Ling-feng1; 2;  SHAN Yu-lin1; 2;  WANG Jing-jie1; 2;  ZHANG Feng1; 2
(1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China; 2. Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China)
Keywords:
bridge engineering;  prestressed concrete pile;  pseudo-static test;  IAJB;  pile-soil interaction;  deformation capacity
PACS:
TU473
DOI:
10.19815/j.jace.2020.05069
Abstract:
In order to explore the ability of prestressed concrete piles to absorb the deformation of superstructure of integral abutment jointless bridge(IAJB), the quasi-static tests of three scaled model piles PC-1 to PC-3 with different prestress levels were carried out. The failure mode and deformation law of prestressed concrete pile were studied by means of earth pressure gauge, displacement gauge and strain gauge. Compared with the concrete piles with different buried depths and without prestress, the influence of prestress on the deformation capacity of flexible piles was further explained. Compared with ordinary concrete pile, the influence of prestress on the strength and deformation of test pile was analyzed with critical load, yield load and peak load as evaluation indexes. The results show that with the increase of prestress level, the failure mode of model pile changes from multiple cracks to one main crack. The location of main cracks in PC-2 and PC-3 is 0.4 and 0.6 times larger than that of PC-1 along the buried depth direction, which indicates that the increase of prestress level increases the pile-soil interaction area, and the effect is more significant than that of increasing the buried depth of pile foundation. With the increase of displacement load, the tensile and compressive strain distribution of PC-1 first appears asymmetry, while PC-2 and PC-3 remain symmetrical under larger displacement load. Compared with the non prestressed concrete piles with different buried depths, it is found that the application of prestress can significantly improve the elastic working range of pile foundation and the integrity and anti cracking ability of pile body compared with increasing the buried depth of pile foundation. Through the analysis and comparison of the bearing ratio of the model pile, it can be seen that increasing the prestress can improve the bearing capacity of the pile body and give full play to the bearing capacity of the soil around the pile. Compared with PC-1, the positive critical load, yield load and peak load of PC-2 and PC-3 are increased, and the yield load is increased by 17.8% and 42.3% respectively than that of PC-1, which indicates that the prestress can increase the elastic working range of concrete pile and improve the deformation capacity. The equivalent stiffness degradation rate of PC-1 is faster than that of PC-2 and PC-3, which indicates that the stiffness degradation of concrete pile can be slowed down by prestressing. Compared with the theoretical calculation value of PHC pipe pile equivalent stiffness, the theoretical calculation value of PHC pipe pile is relatively safe, which can be applied to the calculation of equivalent stiffness of PC pile.

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Last Update: 2021-01-20