Analysis Of The Aseismatic Performance Of Super Long Piled Foundation

Super-long pile foundation is widely used in high-rise and super high-rise buildings in recentyears, because of its high bearing capacity. However, given that few analysis of seismic performance ofsuper-long pile foundation under horizontal loading, they cannot meet the extensive use of super-long pilein pratical projects. Currently, in projects, the desigs and applications of super-long pile foundation arebased on specification requirement of common pile directly, which could cause potential safety andeconomical problems. Due to a lack of funds, complex experimental sites, and heavy workload, it isdifficult to do the experimental study. In addition, numerical analysis of super-long pile also lies someproblems, such as complex modeling, numbers of nodes and long time to calculate. Above all, there arefew studies in this area.In this paper,there will be a four-pile-caps model built by ANSYS software to analyze the upperstructure of model, displacement of pile cap in X direction, displacement of pile in X direction, strain,stress, shear force and moment of pile in Z direction, and changes in soil stress under seismic action. In themeantime, it shows that the soil modulus of elasticity has a strong impact on super-long pile foundation,which means,under seismic action, the greater elastic modulus of soil there is, the less impact onsuper-long pile foundation there will be. Additionally, elastic modulus of pile material has little impact onsuper-long pile foundation, and the basic rule is，greater elastic modulus of concrete lead to less effect onsuper-long pile foundation under seismic action. Besides, it also presents the influence of varies seismicwaves on super-long pile foundation.Finally, there will be a discussion about the effect of soft soil onsuper-long pile foundation.Furthermore, this article also introduces the experimental modeling of caps with four piles, ratio of model and actual is1:40. In the real project, model diameter is800mm, length is44000mm, and the capis8000mm×8000mm×1200mm. Twelve seismic waves are chosen to discuss and lists the differences ofstrain change of pile under four different seismic waves. By comparing the model test and ANSYS finiteelement analysis of the strain changes of pile under EL Centro wave action, it shows that strain changescoincide with the rules. The regularity of changes in super-long pile foundation by combining experimentand theory, and the following conclusion about the seismic performances of super-long pile foundation willalso be illustrated in this paper.