Analysis On Ground Motion Measures For Single-layer Reticulated Domes

Incremental dynamic analyses?IDAs?are widely used in the analyses of seismic responses of single-layer reticulated domes.Effective descriptions of the intensity and duration of ground motions are the keys to applying IDAs.Based on numerical simulation,this thesis analyze a ground motion intensity measure applicable to single-layer reticulated domes and studies on the influence of ground motion duration on the seismic responses of single-layer reticulated domes.The main study contents are follows.?1?Taking a Kiewitt-8 single-layer reticulated dome for example,this thesis carries out analysis on numerical model using ABAQUS.Sensitive frequencies of the numerical modal in horizontal and vertical directions are obtained by carrying out the harmonic analysis.A 3-dimentional ground motion spectral intensity measureS_a,3d basing on sensitive frequencies,is then proposed.Incremental dynamic analyses?IDAs?are carried out for the numerical modal by using 3-dimentional ground motions.Based on the linear regression of IDA results,S_a,3dis evaluated in terms of correlation and efficiency.?2?Spectrally equivalent records which have no significant differences other than duration are selected using spectrally equivalent method.This thesis study on the influence of ground motion duration on the seismic responses and collapse capacity of the structure by carrying out incremental dynamic analyses?IDAs?using spectrally equivalent records.Based on the linear regression of IDA results,duration metrics are evaluated in terms of correlation.Method of control variables is adopted to compare the significance of intensity and duration on the growth of structural damage.