Study On The Inconsistent Movement Of Long-span Structures Subjected To Influence Of Pile-soil Interaction

The stress on long-span structures are much more complex than those on conventional buildings under earthquake.It is not only the increase of dynamic response and the influence of pseudo-static response,but also the coupling of dynamic response and pseudo-static response.Because of its special properties and importance in national economy,it is necessary to study the behavior of long-span structures in earthquake damage.With the improvement of science and technology and the deepening of theoretical requirements for major projects such as sea-crossing bridge,large hangar and gymnasium,the seismic design of large-span structures in China has reached a new height from the traditional consistent input to the current inconsistent input with comprehensive consideration of wave attenuation,structural span and traveling wave effect.However,most of the studies focus on the structural shape,or the input of seismic waves.In fact,because of the special shape of the large-span structure and the limitation of the site,some supports will be designed in the soft soil foundation or different fulcrum will be located in the soil of different properties.It is obviously inconsistent with the objective fact that the structure is regarded as rigid foundation or the input seismic wave is uniformly input in seismic analysis.The study of the effect of pile-soil interaction on the inconsistency input of long-span structures is of great economic and political significance.The main research contents of this paper are as follows:(1)By reading domestic and foreign literatures,master the latest situation of seismic research on large-span structures,conduct in-depth research on the analysis method of pile-soil interaction,and think about how to study pile-soil-large-span structures as a whole.(2)Introduce several common inconsistency input calculation methods of largespan structure,and deduce the inconsistency input calculation method considering pilesoil interaction on the basis of large-mass method;The dynamic differential equation of winkle foundation beam without considering axial force is established,the dynamic impedance of single pile is obtained by matrix transfer method,and the interaction factor between pile,soil and pile is analyzed to extend the dynamic impedance of single pile to group pile impedance.(3)Using the finite element software ANSYS based on APDL language just answer with considering interaction of piles and soil two kinds of finite element model,and then contrast just answer with basis under the condition of not just answer the seismic responses of long-span structure inconsistent input,compared with the existing theoretical results validating model,compared to two kinds of model structure in the key control point displacement,acceleration,bending moment of change.The results show that it is necessary to consider both the inconsistency of input and the interaction between pile and soil in the long span.(4)Considering the influence of pile-soil interaction on the seismic analysis of long-span structures when different seismic waves,different apparent wave velocities and multidimensional seismic waves was used,so as to provide some references for the design of large-span structures considering pile-soil interaction.