Seismic Response Analysis Of Suspen-dome Baesd On Energy Method

The suspen-dome is a new structural system of prestressed spatial structure basedon the single-layer shell and the tensegrity system. It develops rapidly all over the world,particular in the seismic areas, due to their sound mechanical and excellent seismicperformance. Moreover, it is found that the suspen-dome building is the best place forpeople against danger in earthquake and shaking tests. However, a hot issue of thefailure mechanism and failure mode of the suspen-dome under the strong seismicloading needs to address. Although the research on the issue has made someachievements, it is still in an exploratory stage which seriously hinders the applicationof the suspen-dome.In this thesis, the structural response of nodal displacement, strain, energy et alunder the seismic action and the amplitude of acceleration were explored based on theFEA numerical results of the incremental dynamic analysis for suspen-dome, to validatethe failure criterion.And it constructs a cellular automaton (CA) model to predict thefailure load of the suspen-dome. then, it eatablishs the performance-based designmethod of the suspen-dome primarly. The corresponding researches can be simplysummarised as follows:Firstly, the FEA models of suspen-domes with different configuration are built andtheir incremental dynamic analysis under three-dimensional harmonic and TAFTearthquake waves are carried out using the generic software ANSYS. Then, the seismicperformance and the failure features of the suspen-domes are summed up based on thestatistical relationship between the structural response and the amplitude of acceleration.Secondly, the energy-balance equations of the single degree of freedom system andthe multi-degree of freedom system are derived, the numerical calculation methods ofall kinds of energies are explained and the energy-based design criterion is described.After that, the calculatical method of energy balance equations and kinds of energy areverified using the FEA numerical energy results of the single degree of freedom andsuspen-dome under three-dimensional harmonic and TAFT waves.Then, the relationship between the stress state and the strain energy is obtainedthrough analzing the response laws of kinds of energy under the seismic action based onthe energy balance equations. The above research lays a foundation for predicting thestructural failure load using the CA model, validating the exponential strain energydensity-based failure criterion and validating the structure damage coefficient-basedfailure criterion. The seismic performance of the suspen-dome is quantitative evaluationand the performance-based design method framework of suspen-dome are preliminarilyestablished combined with the performance-based seismic design theory and the structure damage coefficient, based on the response characteristics and failuremechanism of suspen-dome under the seismic action.Lastly, some questions relating to CA are disscussed, such as the composition ofthe CA model, the numerical algorithm of suspen-dome’s CA mode, the match criterionfor similar nodal domain, the projection rule, the computational formula of the failureload, the procedure of predicting the failure load using CA model. At the same time, theprediction errors are given out quantificationally when using the CA model throughanalyzing massive numerical examples.