Abstract
The characteristics of bridge pile-group foundation have a significant influence on the dynamic performance of the superstructure. Most of the existing analysis methods for the pile-group foundation impedance take the trait of strong specialty, which cannot be generalized in practical projects. Therefore, a project-oriented numerical solution algorithm is proposed to compute the dynamic impedance of bridge pile-group foundation. Based on the theory of viscous-spring artificial boundary, the derivation and solution of the impedance function are transferred to numerical modeling and harmonic analysis, which can be carried out through the finite element method. By taking a typical pile-group foundation as a case study, the results based on the algorithm are compared with those from existing literature. Moreover, an impact experiment of a real pile-group foundation was implemented, the results of which are also compared with those resulting from the proposed numerical algorithm. Both comparisons show that the proposed numerical algorithm satisfies engineering precision, thus showing good effectiveness in application.
Highlights
Pile-group foundation has been widely used in bridge engineering, and pile–soil interaction has a significant effect on the dynamic performance of the superstructure [1,2,3,4].Mylonakis et al [5] investigated the influence of soil–structure interaction (SSI) on the seismic response of structures by using recorded motions, and concluded that some simplifications about SSI in design may lead to detrimental consequences
Qiao et al [9] established an analytical model of the train–bridge system considering SSI based on the substructure method, and found that it is important to consider SSI in the dynamic analysis of train–bridge systems, but such influence becomes weaker with the increase in the soil shear wave velocity
Tochaei et al [10] investigated the effects of soil–structure interaction and near-field seismic ground motions on cable-stayed bridges based on experiments and numerical analysis; their results indicated that the effect of foundation soil stiffness on the response of the bridge was influenced by the type of input ground motion and that the bridge response was amplified when their foundation was in softer soils
Summary
Pile-group foundation has been widely used in bridge engineering, and pile–soil interaction has a significant effect on the dynamic performance of the superstructure [1,2,3,4]. Dezi et al [28,29] proposed a numerical model for the 3D kinematic interaction analysis of vertical and inclined pile groups in horizontally layered soils, based on BEM–. Proposed a substructure-method-based soil–structure interaction analysis model to study the vertical and horizontal dynamic impedances of piled rafts in homogeneous and layered soil conditions. Zhang et al [33] presented an analytical method to study the horizontal dynamic response of pile groups embedded in partially saturated soil based on the motion theory of three-phase poroelastic media, with the pile–. Based on the viscous-spring artificial boundary theory, the derivation and solution of the impedance function are transferred to numerical modeling and harmonic analysis, which can be carried out using the finite element method. Both comparisons show that the numerical algorithm satisfies the project demand of analysis precision, showing good effectiveness in application
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
