| The natural vibration period of high-rise building is longer,and the response of high-rise building will be greater under the action of long period pulsed ground motion.Therefore,it is necessary to further study the seismic performance of high-rise structures under pulsed ground motion.Buckling restrained braces(BRB)are an excellent energy dissipation device used widely in structural seismic reinforcement.In this paper,the damping performance and vulnerability of buckling constrained braced frame structures under pulsed ground motion are studied.The main contents are as follows:(1)The near-field pulse type ground motion is screened out by the energy index,and the pulse recognition method based on wavelet packet analysis is used to identify the selected ground motion,and the pulse signal is extracted and the remaining signal is retained.The influence of the extracted signal and the remaining signal on the BRB damping structure is analyzed.(2)The performance of BRB structures with different arrangements under pulsed ground motion is analyzed.The frame structures with different BRB arrangements under frequent and rare earthquakes are analyzed by taking the inter-story drift ratio,the peak displacement of the top floor and the BRB energy dissipation as the indexes.(3)Based on incremental dynamic analysis,the seismic vulnerability analysis method is used to evaluate the seismic performance and collapse resistance of frame structures based on different arrangements of BRBS under pulsed ground motion.(4)Under the action of different signals,the probability of exceeding the specified limit state and the collapse resistance performance of the shock-absorbing structure with BRB symmetrically arranged in the shape of “herringbone” on the second and third spans under the same seismic intensity index were compared.The results show that the near-field pulse-type ground motion has a great impact on the structure,and the pulse signal is the main component of the structure damage. |
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