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原文传递 Development of Hurricane Resistant Cable Supported Traffic Signals.

题名：	Development of Hurricane Resistant Cable Supported Traffic Signals.
作者：	cook, r. a. johnson, e.
关键词：	signal support systems,traffic signals/dual cable system, hurricane damage, single cable system, high velocity winds/
摘要：	Performance of traffic signal support systems during hurricanes has indicated that the current dual cable system often experiences substantial damage. Damage to these signal support systems typically occurs in the hanger or quick disconnect box near the connection to the messenger cable. Because there is widespread use of single cable support systems in hurricane prone regions of other states, this project investigated the performance of both dual cable and single cable support systems under high velocity winds. Thirty-one wind load tests were performed using both dual cable and single cable support systems. The weight, orientation, and type of signal support hardware were modified to show the effects of various signal configurations. Test results indicate: (1) The difference in signal rotation is insignificant between cable and single cable systems. (2) The tension in the catenary cable does not significantly increase for either system; however, in the dual cable system, the increase in tensile force is substantial in the messenger cable resulting in increased flexural loading in the pole support structure. (3) Cable support traffic signals should be designed using both the drag and lift coefficients rather than just the drag coefficient since the signal rotates. / NOTE: Final rept. / Supplementary Notes: Sponsored by Florida State Dept. of Transportation, Tallahassee. Research Management Center. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
报告类型：	科技报告