PHC管樁-土相互作用受力性能擬靜力試驗(yàn)
[Abstract]:In view of the problem that the design and calculation method in JGJ 94-2008 is difficult to be applied to the pile foundation of monolithic bridge abutment, the experimental model of prestressed high-strength concrete (Prestress High Concrete,PHC) pipe pile is taken as the background. Quasi static test of PHC pipe pile under low cycle reciprocating load was carried out. By applying horizontal displacement load on top of pile, embedding strain gauge, soil pressure gauge and testing method of horizontal displacement of pile body of special design, the failure characteristics of pile body in PHC pipe are obtained, and the horizontal displacement and strain of pile body along the direction of pile depth are obtained. Skeleton curve and hysteretic behavior curve, the mechanism of pile-soil interaction is discussed, and the equivalent stiffness calculation method of PHC pipe pile-soil interaction is given. The test results show that the degree of prestress and the ratio of reinforcement have great influence on the failure mode of PHC pipe pile, the distribution of crack is different, the maximum bending moment develops along the direction of pile depth, the distribution of internal force is redistributed, the ratio of reinforcement and degree of prestress is smaller, The worse the deformation capacity (ductility) is, the more serious the damage is, the worse the pile-soil interaction effect is, the more linear elastic behavior of the PHC model pile is at the initial loading stage, and the horizontal external load is mainly borne by the model pile. When the concrete in the tensile zone of the model pile exits from work, the increase of load slows down and shows obvious nonlinear performance. After that, the increase of the horizontal external load is mainly borne by the resistance of the soil around the pile. When the soil pressure around the pile reaches the limit, the load begins to decrease and destroy rapidly, and all the model piles show good plastic performance and deformation ability, the ductility coefficient is larger, and the seismic performance is better during the whole test process. It can be applied to the pile foundation of monolithic abutment bridge, and the research results can be used as reference for the design and calculation of relevant codes.
【作者單位】: 福州大學(xué)土木工程學(xué)院;
【基金】:國家自然科學(xué)基金項(xiàng)目(51578161,51278126)
【分類號(hào)】:TU473.1
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