Vehicle-Induced Gust Loads on Aluminum Overhead Sign Structures.

摘要

Vehicle-induced gust loads are not included in New York State's design of aluminum overhead sign support structures and designers have feared that these loads might lead to fatigue failures. This report summarizes the results of a project initiated to determine if current design procedures must be revised,and if existing sign structures should be inspected for possible damage. Two existing sign structures on I 787in Albany were instrumented and tested. Dynamic strain was measured using a specially constructed data-acquisition system capable of monitoring up to eight channels of data at the rate of 200samples per second per-channel. Test data included stress range histograms,frequencies of vibration,and damping coefficients for sign structure vibration induced by large vehicles,in this case trucks.