地震研究

北京大兴国际机场航站楼是世界上最大的单体隔震建筑,其隔震装置多达1 376套。大量隔震装置应用于同一大型工程结构,其工作状态及服役性能值得关注。因此,需利用机场航站楼的隔震层监测及性能评估系统,评估机场核心区隔震装置的服役状态及工作性能。介绍了系统的建设及组成部分,并分析了其在地铁、高铁等日常环境激励下的工作状态,最后以2023年山东平原5.5级地震为例,对隔震装置的隔震效果及系统的运行状态展开了检验和评估。结果表明:隔震层监测及性能评估系统在日常事件和突发地震中均可保持正常运行,隔震支座能够有效降低地震动的影响,提高建筑物的抗震性能。

As the largest single-structure seismic isolation building in the world,the terminal building of Beijing Daxing International Airport has been installed with various types of isolation devices including lead rubber isolation bearings,ordinary rubber isolation bearings,sliding isolation rubber bearings,and viscous dampers.A total number of 1 376 sets of isolation devices have been used.The variety and quantity of isolation devices greatly ensure the safe operation of the airport,but at the same time,this also poses great challenges to the isolation devices' daily monitoring and maintenance.Therefore,based on the monitoring and performance evaluation system of seismic isolation layers,this article focuses on investigating the working status and isolation performance of the isolation system in the core area of the airport.The construction and components of the monitoring system were introduced,and the working status of it under daily environmental excitation such as subways and high-speed trains was analyzed.Finally,taking the 2023 Pingyuan,Shandong M5.5 earthquake as an example,the performance of the isolation devices and the operational status of the system were tested and evaluated.Results show that the system can maintain normal operation in the daily work and in the case of earthquakes.Isolation bearings and dampers can effectively reduce the earthquake-caused vibration of the buildings,therefore improving the buildings' seismic performance.

引言
1 隔震层监测和性能评估系统
2 隔震效果评估
3 结论

图1 大兴国际机场平面及测点位置<br/>Fig.1 The plan view of Beijing Daxing International Airport and layout of sensors

图1 大兴国际机场平面及测点位置
Fig.1 The plan view of Beijing Daxing International Airport and layout of sensors

图2 航站楼负一层隔震支座和黏滞阻尼器(a)及隔震层位移监测子系统(b)<br/>Fig.2 Isolation bearings and viscous dampers on the basement level of the airport terminal(a)and monitoring system for the displacement of isolation bearings(b)

图2 航站楼负一层隔震支座和黏滞阻尼器(a)及隔震层位移监测子系统(b)
Fig.2 Isolation bearings and viscous dampers on the basement level of the airport terminal(a)and monitoring system for the displacement of isolation bearings(b)

图3 地铁(a)和高铁(b)经过时的机场南北向加速度响应时程及不同频率下的PGA<br/>Fig.3 Time series of acceleration and peak acceleration under the excitation of subway trains(a)and high-speed trains(b)

图3 地铁(a)和高铁(b)经过时的机场南北向加速度响应时程及不同频率下的PGA
Fig.3 Time series of acceleration and peak acceleration under the excitation of subway trains(a)and high-speed trains(b)

表1 部分测点PGA比较<br/>Tab.1 Comparison of the peak acceleration at some points

表1 部分测点PGA比较
Tab.1 Comparison of the peak acceleration at some points

图4 B点隔震层下部(a)和上部(b)的加速度响应时程及频率分布<br/>Fig.4 Time histories and frequencies of acceleration responses at the bottom(a) and on the top of the seismic isolation layer(b)of Point B

图4 B点隔震层下部(a)和上部(b)的加速度响应时程及频率分布
Fig.4 Time histories and frequencies of acceleration responses at the bottom(a) and on the top of the seismic isolation layer(b)of Point B

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备注

引言

1 隔震层监测和性能评估系统

2 隔震效果评估

3 结论

期刊信息