2023年积石山地震重要公共建筑吊顶震害调查分析

Investigation of seismic damage to ceilings of public buildings during the 2023 Jishishan earthquake

对2023年6.2级积石山地震中公共建筑内部吊顶开展了震害调查及分析,并以积石山县大河家镇大河家中学教学楼、中西医结合医院门诊楼以及中国邮政银行会议室3处典型震害为例,分析了在以往的公共建筑吊顶震害调查及研究中较少涉及的铝扣板吊顶、间接悬挂式吊顶的新震害现象及典型震害特征。研究表明:铝扣板边角锋利,卡入式连接对龙骨网格平整度要求较高,此类吊顶如若用于抗震要求较高或人员较为密集的建筑内,建议进行专门的抗震分析,以避免坠板伤人或妨碍人员逃生。此外,在吊顶地震损伤评估中,除坠板率外,还应考虑龙骨网格变形等因素。应加强吊顶中照明单元与主体结构连接的可靠性以避免其在地震中出现大量坠落。研究结果可为公共建筑吊顶抗震研究与工程应用提供参考。

A seismic damage investigation and analysis were conducted on the internal ceilings of public buildings in the 2023 M_s6.2 Jishishan earthquake.Three typical seismic damages,including the teaching building of Dahejia Middle School in Dahejia Town,Jishishan County,the outpatient building of Integrated Traditional Chinese and Western Medicine Hospital in Jishishan County,and the conference room of China Postal Bank in Jishishan County,were taken as examples to analyze the aluminum buckle plate ceilings that were less involved in previous investigations and study on typical seismic damage characteristics of aluminum buckle plate ceilings and indirect suspended ceilings,and some new seismic damage phenomena.Analysis suggests that aluminum buckle plates have sharp edges and corners,and the snap in connection requires a high level of flatness in the runner grid.If this type of ceiling is used in buildings with high seismic requirements or high personnel density,it is recommended to conduct specialized seismic analysis to avoid falling plates that may be harm to people or hinder their escape.In addition,in the assessment of seismic damage to suspended ceilings,in addition to the drop rate,factors such as deformation of the runner grid should also be considered.Furthermore,the reliability of the connection between the lighting units in the ceiling and the main structure should be strengthened to avoid a large number of falls during earthquakes.The analysis can provide reference for the seismic research and engineering application of suspended ceilings in public buildings.