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原文传递 Design, Testing, and Specification of a Mechanical Damping Device for Mast Arm Traffic Signal Structures

题名：	Design, Testing, and Specification of a Mechanical Damping Device for Mast Arm Traffic Signal Structures
作者：	R.A. Cook, D. Bloomquist, D S. Richard, M.A. Kalajian, V.A. Cannon and D.P. Arnold
关键词：	mast arms, damping, traffic signal supports, vibrations
摘要：	Several mast arm failures have been observed in Florida and other states from fatigue caused by wind-induced vibrations. An economical method to mitigate the effects of wind-induced vibration on these types of structures is to install mechanical damping systems directly on the mast arm. These devices limit the amplitude and duration of vibrations resulting in an increase in the design life of the structure. This report describes the development and testing of several different damping devices for cantilevered mast arm structures. Prototype damping devices were tested on a 37ft mast arm constructed in the Structures Laboratory at the University of Florida. Successful devices were then field tested on three existing mast arms to determine their effectiveness on a range of mast arm lengths. The optimum device was then placed on a mast arm in Tampa, Florida that had been observed to undergo significant wind-induced movement on a regular basis. The structure was monitored with and without the device in place to compare the overall effectiveness of the device. The specifications for a tapered impact damper (final device) are included.
报告类型：	科技报告