Research On Seismic Response Analysis And Seismic Performance Assessment For High-rise Buildings Considering Soil-structure Interaction Effect

It's of great significance for predicting seismic response and seismic performance assessment of high-rise building considering soil-structure interaction effect,which is an emphasis and difficulty in the field of seismic engineering.Some scholars have done a lot of job and got great achievement in the field,but there's still a lot to do due to its complexity.Based on present research works,theorical analysis method and numerical simulation way were combined to study coupling effect mechanism of high-rise building-pile-foundation system.Bending theory of flat plate with extensive four-displacement and overall modelling and analysis method for high-rise building-pile-foundation system were put forward. High-rise building interaction system three-dimensional solid finite element fine modeling was set up by software ABAQUS.The influence of soil-structure interaction effect for seismic response of high-rise building was analysized and parameter analysis was performed accordingly. Dynamic interaction mechanism was disclosed and advice and suggestions were given for designing pratice. Seismic performance assessment method for high-rise buildings based on capacity-spectrum method including soil-strucure interaction effects was put forward. The main research and results involved in the dissertation includes the following parts:(1) Summarize status in quo of seismic analysis method and seismic performance assessment for high-rise building and points out questions to be solved based on quantities of literature domestic and abroad.Discuss and summarize interaction mechanism and analysis method for high-rise building-pile-foundation system and indicated problems to be improved on.Bending theory of flat plate with extensive four-displacement was put forward considering transverse extension and contraction displacementΦ3 and governing differential equations are accurately derived for moderately thick rectangular plates on elastic foundation by means of variational method.An overall analysis method was put forward for high-rise building-pile-foundation system in which soil and structure were roled into one which pave the way for high-rise building-pile-foundation system seismic response analysis.High-rise building-pile-foundation three-dimensional solid finite element fine modeling was set up for the real Jiannanchun Hotel high-rise building which endured the Wenchuan earthquake by software ABAQUS.The principle of the influence of pile bottom soil and pile side soil upon superstructure vibration characters was drawn after studying the interaction system vibration characteristic.The different principle of seismic response under or without interaction effect,according to method suggested in the paper or conventional were compared.(2) The new overall analysis method put forwarded in chapter 2 was used for high-rise building-pile-foundation three-dimensional solid finite element fine modeling.Concrete and soil nonlinearity and contact nonlinearity were considered in the model and great earthquake records were selected.Nonlinear time-history analysis were performed for the model and parameter influencial analysis were done afterwards for superstructure,soil material,soil parameter change,boundary conditions and contact nonlinearity. Some suggestions were given for high-rise building design after anslysis and investigation on site.(3) The capacity-spectrum method including soil-strucure interaction effects according to FEMA440 was introduced in the paper and the way for calculating the stiffness of soil was improved on to match Chinese engineering practice according to Code for seismic design of buildings. A real project was selected to be analysized according to improved capacity-spectrum method including soil-strucure interaction effects.The method was improved feasible after comparison with nonlinear dynamic time-histoty analysis.