基于PCI规范的预制混凝土双T板动力性能校核

Vibration serviceability assessment of precast concrete double-T slabs based on PCI design handbook

近年来,预制混凝土双T板楼盖被越来越多地用于大跨度工业与民用建筑中。双T板由于具有跨度大、自振频率低、阻尼小等特点,在人致荷载（如行走、跳跃和跑动等）作用下可能产生振动舒适度问题。美国PCI规范（2010版）对于双T板的振动舒适度有相应的设计控制要求,而中国目前尚无具体的规定。为此,本文根据美国PCI规范的双T板舒适度验算方法,对中国图集09SG432-2中的双T板动力特性进行计算分析,校核其舒适度是否满足要求,同时给出了综合考虑挠度和舒适度要求时各板型的适用跨度。

In recent years,due to the ultimate pursuit of large architecture space and the application of lightweight high-strength construction materials and advanced structural system,precast double-T labs have been increasingly popular in public buildings like stations or stadia in China. Because of the natural frequencies of long-span precast concrete double-T slabs are relatively low,which may fall into the frequency range of pedestrian induced load（ e. g. walking,jumping or running）. Besides,long-span precast concrete double-T slabs are always characterized by their low damping.As a result,the vibration serviceability problem has become an important design issue. Current research of human induced vibration and control of such annoying vibration is far from success. There are no widely accepted understanding or design codes to configure dynamic behavior of such structures. According to the calculation method of the vibration serviceability from the PCI Design Handbook（ 2010）,this paper has calculated the dynamic behavior of the double-T slabs in the Chinese atlas（ 09 SG432-2）,checked whether the vibration serviceability meet the requirements of the relevant norms of China or not,and gave some advice for how to avoid this problem.