基于问卷调查与数值仿真的城市建筑群人员震感分布规律研究OA

To accurately characterize the distribution of seismic perception among occupants within urban building clusters,this study proposes a hybrid approach integrating questionnaire surveys with seismic response simulations of building clusters,and applies it to investigate the perceived shaking distribution among personnel in Chengdu's five central districts during the 2022 Ms6.1 Lushan earthquake and the Ms6.8 Luding earthquake.A total of 735 questionnaires were collected within 72 hours after the earthquake,and the effects of building height and floor location on the perceived seismic intensity among buildings are examined.The questionnaire results show that residents' perception of earthquakes and their responses are strongly correlated with the height of the building and the location of the building floor.The earthquake was felt most strongly by those in the upper part of the building,followed by the middle part,and the weakest in the lower part.We collected basic attribute data through field investigations for over 163 000 Chengdu buildings.Seismic damage simulation models of buildings were developed using an urban seismic disaster simulator.Based on the measured ground motion data,the dynamic responses of each building during the earthquake were simulated and the perceived intensity levels were evaluated.The rationality of the numerical model was verified using the questionnaire survey data.A parametric study was conducted focusing on two primary factors,peak ground acceleration(PGA)and building height.The numerical simulation results demonstrate that as the PGA increases,the seismic perception is enhanced to different degrees.When the PGA ranges from 18 to 35 cm/s2,most individuals experience discomfort.When the PGA ranges from 35 to 50 cm/s2,the discomfort intensifies,with most people feeling highly uncomfortable.When the PGA is in the range of 50-200 cm/s2,the proportion of individuals who perceive the shaking as intolerable rises steadily.Once the PGA exceeds 200 cm/s2,this proportion reaches over 95％.The perceived seismic intensity of occupants is significantly affected by the total building height,while for low-rise and multi-story buildings,the perceived seismic intensity generally increases linearly with the number of floors.