Study of Fatigue Damage in Overhead Sign Supports and High Light Towers

摘要

The objective of this study was to determine which, if any, of the overhead sign structures and high light towers in Kansas were being subjected to excessive fatigue damage by the dynamic effects of wind. The equipment used during the testing included S-N Fatigue Life Gage Model FM 520-10.0L made by Micro-Measurements and a BLH Strain Indicator Meter. The analysis of the gage readings collected during the seven years the study was conducted using the gages and equipment described appears to indicate that none of the sign supports or light towers are experiencing excessive fatigue damage.