3D FINITE ELEMENT STUDY OF SOIL-PILE KINEMATIC INTERACTION BEHAVIOUR ON INTERFACE OF SOFT CLAY AND MEDIUM CLAY SOIL DUE TO EARTHQUAKE

• Main Author: Andarwan (25015308), Zaitun
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31884
• Institution: Institut Teknologi Bandung

<p align="justify">Foundation design so far only considers the effect of inertia and ignores the kinematic effect. Even though the maximum response that occurs on the foundation can be caused by the inertia interaction or kinematic interaction <br /> <br /> In this study, evaluation of pile kinematic response due to seismic load was carried out by three-dimensional (3D) finite element method using ABAQUS software. Validation of modeling techniques is done by comparing the results of soil responses and pile foundations responses from centrifugal test. This parametric study was carried out using 30 m of Bandung clay consisting of two layers. The upper layer is soft clay and the lower layer is medium clay. The soil constitutive model used is Extended Cam Clay. Evaluation of the moment and shear force responses that occur on the interfaces of the two soil layers are reviewed based on the effect of increasing Peak Ground Acceleration (PGA), ratio of pile length (Ld) to pile diameter (D), ratio of soft soil thickness (La) to the embedded pile length (Ld), earthquake predominant period and pile group effect. The representation of the upper structure is modeled as axial and lateral loads acting on pile cap according to the static allowable capacity of single pile. <br /> <br /> Based on the results of the analysis, the maximum moment and the shear force of the pile occur around the interface of the two soil layers. The increase in the maximum moment and shear values is proportional to the increase in the Magnitude of PGA, inversely proportional to the increase in the Ld/D ratio, proportional to the increase in the La/Ld ratio, proportional to the approaching natural soil period and the earthquake predominant period and inversely proportional to the increase in the number of pile group.<p align="justify">