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

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 long-span 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 obtained as if reached 0.01.