Abstract
The tensile forces acting on the cable of long-span bridges are one of the most important factors since they reflect not only the structural stability of cables but also the overall quality of construction. Currently, indirect measurement using accelerometers attached to the surface of the cable is widely used to measure the natural frequency of cable. The frequency obtained from the accelerometer is converted to the tensile force of the cable. However, it sometimes requires many hazardous labors such as attaching the device on the surface of cable and wiring it with data logger, which could hinder the safety of workers during the erection of cables. In this study, a method using laser vibrometer is introduced to measure the tensile forces on cables at a distance. In addition, this study developed a unique postanalysis computer program that can calculate the tensile forces in real time. Compared with the values obtained from the accelerometers, the laser vibrometer system provided accurate and reliable matching.
Highlights
Long-span bridges have become more constructed since the market rapidly grew up from the late 1990s
There are some discrepancies between the simulation values and the actual responses of the bridge. Structural engineers identify these discrepancies from stochastic sensitive analyses. We identified these discrepancies from the measurements of cable tensions because we could measure sixteen cable forces using a laser vibrometer within an hour
This study has been the first trial to find out a tension measuring method using the portable vibrometer in Korea
Summary
Long-span bridges have become more constructed since the market rapidly grew up from the late 1990s. The measurement for tensile force on cable is required to be precisely measured and calculated for structural integrity when the construction is complete [1]. For the calculation of tension force on cables, accelerometers attached to the surface of the cable are mainly used to measure the natural frequency of cable [4] They sometimes require many hazardous works such as attaching the device on the surface of cable and wiring it with data logger, which could hinder the safety of workers in the middle of cable. It is sometimes even more dangerous when the bridge deck work is not yet finished. Compared with the previous method using accelerometers, the developed system is assumed to be accurate and reliable
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