The Effect of Building Model Considering Pile Foundation in Seismic Evaluation

Abstract

This article presents a comparative study of the evaluation results and responses of the building between model building considering pile foundation and model building considering without pile foundation under seismic load using Phayao Province spectrum. In this study was selected commercial building 4 story reinforced concrete of the Department of Public Works and Town & Country Planning. The foundation model is constructed with frame element and spring represented pile embedded in soil under lateral load of the piles at different depths. Base on the study, it reveals that, the building model with pile has difference
mode shapes and higher natural frequency in fundamental mode shape and model participation ratio compared with the building model without pile. Models with piles had lower Y-axis stiffness values for lateral forces, increased building maximum resistance values and were assessed with reduced seismic loads, resulting in a reduced level of damage. The researcher experimented with changing the length of the piles to be of different lengths. It was found that the analysis of structures with pile foundations would reduce the seismic force used to assess if the pile length was increased. But the building structure will have more buildingdeformation. The building model should consider sub structure, especially in case consider the length of the pile foundation, in order to evaluate the seismic performance of the building properly.