Innovative Monitoring Techniques on the Cables of Cable-Stayed Bridges (I)−Considering Guide-Pipe Constraint on Cables
2006
This paper describes how, around the deck and the pylon of a cable-stayed bridge there are two-to-three-meter-long guide-pipes that protect the cable tendons. With a rubber damper inside, the guide-pipes reduce the vibration induced by wind, stem the flow of rain into anchors, and therefore increase the service life-span of the anchor system. However, from the viewpoint of the cable structure, the guide-pipe constrain the free length of the cables and they affect the natural frequencies of the cables so that the engineers tend to overestimate or underestimate the true cable force by any theories or models without considering the guide-pipe effect. To illustrate the cable force analysis considering guide-pipe constraint on cables, this paper apply wireless sensing technology to measure the frequency spectrum and the fundamental mode shape of a cable. After the measurement work, through the finite element method (FEM) inverse calculation process, the effective constraint imposed by guide-pipes and the precise cable force are quantitatively analyzed.
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