Abstract
The method of estimating tension of bridge cables by measuring their natural frequency, so-called vibration method, is a very convenient way at the construction site of structures with cables. However in order to apply the method to estimate hanger-rope tension of a suspension bridge which has long spans, there still exist several problems to be solved as shown below because those ropes are tied with hanger clamps.
1) The vibration mode of two hanger ropes connected with a hanger clamp is needed to research beforehand.
2) The effect of hanger-clamp weight on estimated tension is necessary to investigate beforehand.
3) The accuracy of tension estimated by vibration method is necessary to compare with tension measured by a loadcell so as to get reliable estimation.
In this paper, the above mentioned problems are discussed and checked.
