Analysis Of The Common Work Of Pile-soil-structure Considering Space Effects

According to the development of the society and economy,pile foundations have played more and more important effects in the development of modern civil engineering. At present,pile foundations in the offshore petroleum platforms,super high-rise buildings and long span bridges,should not only bear vertical loads but also accept horizontal loads to adapt high,heave,large buildings.It was difficult for the traditional analytical methods to the satisfactory answers to the designs of the complicated buildings,such as high-rise buildings,offshore petroleum platforms. Only through the principle of the common work,the relatively actual result is to be obtained by global considering restricts and interactions of pile-structure each other. The common work of pile-soil-structure is regarded to an entirety,and should meet the coordination condition on contact side each other. At present,the analysis is only confined to pile basic in much domestic and international software. On the interaction of pile basic and top structure,there are many problems of calculation models and applications,through the domestic and international scholars have done some helpful exploration.The systematic of non-linear structure,NSAS,is the finite element software with independent property right in the microcomputer by the Structure Research Institute of Zhejiang University,it has been strong containment.The paper compares and analyses in detail to the methods of the soil-pile interaction,by summarizing on the domestic and international latest theory and research systematically. So the rational and effective method of the soil-pile interaction is put forward and program composition corresponding in this paper. The pile bearing capacity is analyzed respectively with static load,dynamic load. It is achieved the common work of pile-soil-structure on NSAS by using nonlinear bars from single pile calculation as the structure boundaries.The results show that under some 3-D loading conditions,significant error can be induced due to the nonlinear characteristic of pile,simply using a nonlinear spring from single pile calculation as the structure boundaries. Through the study of this problem,that an amendment method is presented for non-linear curve of equivalencepile head. The method can be used to analyze the three dimensional effect on NSAS and commercial software ANSYS.