Abstract:
This research 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 and using Bangkok spectrum. So, there are 2 models. In this study, 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. Based 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 makes a model of a building with piles in Bangkok and with changing the length of the piles to be of different lengths. It was found that the analysis of structures with pile foundations and located in soft soil areas would reduce the seismic force used to assess. But the building structure will have more building deformation. The building model should consider sub structure, especially in case consider location area and length of the pile foundation, to evaluate the seismic performance of the building properly.