Abstract: Considering the interaction of frame structure,raft foundation and ground base by using the numerical simulation method of ANSYS procedure and the condition of the stationary balance of the linked point between frame structure,raft foundation and the distortion harmony condition,the method of the interaction of frame structure,raft foundation and subsoil was formed.And comparson with the conventional design of frame structure in column internal force and column bending moment was made.Results show that when considering the interaction,the raft foundation deformed “basin shape”,and frame structure stress was re-distributed.Angle axial force increased,and the side column and the column axial force decreased,and the moment also significantly increased.Settlement of rafts of different thickness was different;with the increase of thickness,the maximal settlement became smaller.

Key words: frame structure, raft foundation, interaction, settlement