DYNAMIC ANALYSIS FOR MODULAR STRUCTURES. CONSIDERING SOIL - PILE - STRUCTURE INTERACTION

Abstract eng:
Advanced method of soil-pile-structure interaction is introduced in the dynamic analysis for modular structures in order to design cost-efficient foundations and structures. The dynamic analysis is divided into two stages for simplification purposes. In the first stage, a simplified analysis is performed to optimize the piling and foundation layouts. The simplified FEM models are then validated to ensure reliability of analysis. In the second stage, a detailed superstructure model is evaluated to check for excessive local vibration within the structure. A typical steel frame module in the scope of this study is 54 m long, 14.7 m wide and 35 m tall with a total weight of approximately 4,000 metric tons. The modules are supported on concrete piled foundation, with 15 m long 400 mm square precast concrete piles, situated in highly variable soil conditions. The radiation damping (geometric damping) of soil-pile system mainly governs the vibration of foundation and structure. The stiffness and damping of piled foundation are generated frequency dependent. Then, the impedances of piled foundation are imported to the FEM model as boundary conditions. The dynamic response of the structure is calculated using time history analysis and steady state analysis. Different design options of piled foundation are compared in order to optimize cost and to meet the allowable machine vibration and human perception limits.

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