大空间结构上空气源热泵机组减振研究

Damping efficiency of air-source heat pump on long-span structure

基于一6层大空间框架结构的工程实例,列举了其屋面空气源热泵机组运行时,屋面及顶层楼面的振动情况,分析了机组运行引起的建筑结构振动的原因;在屋面支承梁与机组原隔振层下钢梁之间增设隔振层,形成双层隔振系统;建立了刚性基础双层隔振模型以及机组-屋面耦合的双层隔振模型,对比分析了大跨度结构对于机组减振效率的影响;列举了实施双层隔振后实测的减振效果.分析和测量结果表明,大跨度建筑结构楼、屋面竖向刚度偏低,不利于抑制由机组运行产生的微振动;对于大跨度结构而言,常规的振动传递率设定偏低,应结合建筑物的使用功能提高减振标准,振动传递率控制在0.01左右可得到比较理想的减振效果.

Based on a case history, a six-floor long-span frame structure, the measured vibration data of the roof and top floor are enumerated, while the equipments of air-source heat pump running on the roof, and the vibration causes of longspan structure are analyzed. An isolated layer is added on between the roof-supporting beam and the steel under the original single isolated layer, and double-layer isolation system is formed. Double-layer isolation model with rigid ground and that with equipment-roof couple are built correspondingly to analyze the equipment damping efficiency on the top of the long-span structure. The actual measured vibration data are presented after double-layer isolation system was carried out. Analysis and measurement results show that the floor or roof vertical stiffness of long-span structure is a little smaller and do not benefit to reduce the microvibration in the structure induced by the equipment running. The vibration transport of usual control standard is a little lower to the long-span structure, and should be increased based on the building function, and good damping effect could be obtaiaed as if reached 0.01.