Vehicle Impact Simulation for Curb and Barrier Design. Volume 1: Fatigue211 Performance of Variable Message Sign and Luminaire Support Structures

摘要

In order to determine equivalent static pressures for fatigue loads on211u001ecantilevered highway support structures a cantilevered Variable Message Sign 211u001e(VMS) located along Interstate westbound at mile marker 48.5 in northern New 211u001eJersey was continuously monitored for three months. The structure was 211u001einstrumented with strain gages, pressure transducers, and a wind sentry. All the 211u001edata was collected with a Campbell Scientific CR9000 digital data acquisition 211u001esystem. A cellular phone transceiver enabled remote communication with the data 211u001elogger. The system and instrumentation was powered with solar powers and marine 211u001ebatteries. Short-term testing was performed on the structure to determine the 211u001edynamic characteristics such as stiffness, natural frequency, and percent of 211u001ecritical damping. Results of the short-term test indicated that the stiffness was 211u001e0.24 kN/mm, the first and the second modes were 0.87 cycles/s and 1.22 cycles/s 211u001erespectively. Long-Term monitoring was performed to capture the structures 211u001eresponse to natural wind gusts, galloping, and truck-induced wind gusts.