Abstract
This study proposes a new damage identification method for hangers of arch bridges using the static deflection difference at the anchorage point of the hanger and the tie-beam. The relationship between the ratio of cable tension loss and the deflection difference at the anchorage point is studied. For the first time, the deflection difference influence matrix for hanger damage identification is defined. The static deflection change parameter is formulated as a function of the deflection difference influence matrix and the ratio of cable tension loss. The study shows that the percentage of cable tension loss can be obtained from the changes in static deflection at the anchorage point and the deflection difference influence matrix. Therefore, by observing a plot of the ratio of cable tension loss, the damage locations can be identified conveniently. Numerical and laboratory studies show that this method can accurately locate the damaged hanger of through-arch bridges under various scenarios. The proposed damage detection method has a clear theoretical base and is simple to operate, and it is suitable for practical engineering.
Highlights
The arch bridge has become a widely used bridge-type because of its large span, short construction period, and beautiful appearance
Motivated from recent advances in deflection measurement technology, a new method that does not rely on an optimization algorithm is proposed to locate damaged hangers in through-arch bridges using the static deflection changes of the tie-beam
This paper presents a method to identify the damage of the hanger by using the influence matrix of static deflection difference of tie-beam
Summary
The arch bridge has become a widely used bridge-type because of its large span, short construction period, and beautiful appearance. The damage of the hanger causes the redistribution of the tension force and the changes of loads on the tie-beam. Motivated from recent advances in deflection measurement technology, a new method that does not rely on an optimization algorithm is proposed to locate damaged hangers in through-arch bridges using the static deflection changes of the tie-beam. The purpose of this method is to solve the early damage, so it belongs to the linear damage category, in which the state of the structure before and after the hanger’s damage is assumed to be linear. The hanger adopts a circular section with a diameter of 120 mm, and the bridge deck is subjected to a uniformly distributed load of 9.8 KN/m
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