实验技术与管理2025，Vol.42Issue(7)：26-33,8.DOI:10.16791/j.cnki.sjg.2025.07.004
大型建筑设备-结构耦合效应的振动台试验研究
Shaking table experimental study considering the coupling effect of large-scale building equipment and structures
摘要
Abstract
[Objective]This study investigates the interaction between equipment and building structures,with a focus on how equipment mass and stiffness influence the dynamic response of these structures.To achieve this,large-scale shaking table tests were conducted using a scaled model of a benchmark steel frame of the equipment.[Methods]The equipment model was based on a water-cooling machine,a crucial component of large-scale equipment used in industries relating to the medical,chemical,and high-tech sectors.The selection of the model considers the overall weight,vibration characteristics,and other features of this type of equipment.The decoupling reconstruction method was used to decompose the equipment system into mass and stiffness characteristic components.The scaled model of the main structure used a benchmark steel frame,which is a standard model for structural analysis and validation research.The El Centro seismic wave was applied as an input to the shaking table at a maximum peak acceleration of 0.4 g,complemented by a white noise input of 0.05 g before and after each test.For the coupled system,connectors with varying stiffness were sequentially swapped under each counterweight level,resulting in five tests and 25 working conditions.Through these large-scale shaking table tests,the frequencies of the equipment at different masses and stiffnesses were analyzed,along with the effects of equipment frequencies on the vibration modes and dynamic responses of the coupled system.The acceleration time-history curves were directly recorded using acceleration sensors,while displacement time-history curves were derived through integration methods.[Results]As the frequency of the equipment decreased,the first mode shape of the main structure transitioned from translational motion to stationary,while the third mode shape shifted from torsional to translational.The first and second mode shapes of the equipment evolved from relatively stationary to translational.High-frequency equipment can be regarded as an additional mass for the seismic performance analysis of coupled systems.The coupling effect sharpened the acceleration time-history curve of the main structure,increasing the peak during intense vibration periods and decreasing the peak during mild vibration periods,while the acceleration time-history curve of the equipment exhibited an opposite evolutionary pattern.As the frequency of the equipment decreased,the maximum acceleration peak of the structure first decreased and then increased,whereas the equipment displayed a trend of first increasing and then decreasing.The equipment tended to suppress the acceleration response of the structure.The coupling effect also sharpened the displacement time-history curve of the main structure,resulting in a reduction in the displacement amplitude,while the displacement amplitude of the equipment demonstrated similar characteristics.As the frequency of the equipment decreased,the maximum peak displacement of the structure first decreased and then increased,while the equipment showed a trend of first increasing and then decreasing,indicating that the equipment can suppress the displacement response of the structure.[Conclusions]In seismic design,it is essential to analyze equipment and structure as integrated systems to accurately assess their actual responses under seismic action,thereby avoiding unnecessary increases in cost due to overestimating seismic demand.Additionally,placing equipment sensitive to acceleration responses,which may induce adverse resonance,should be avoided in areas identified as seismically weak.This research provides theoretical support for the seismic design of coupled equipment-structure systems.关键词
耦合效应/振动台试验/Benchmark钢框架/动力响应Key words
coupling effect/shaking table test/Benchmark steel frame/dynamic response分类
建筑与水利引用本文复制引用
秦昌安,张国伟,宋金成,王晨,周洲,熊梓言..大型建筑设备-结构耦合效应的振动台试验研究[J].实验技术与管理,2025,42(7):26-33,8.基金项目
国家自然科学基金项目(52408502) （52408502）
