Impulse Effect on Redundancy of a Tied-Arch Bridgeby Leon L-Y. Lai, (A.M.ASCE), Rathyeon Engineers &, Constructors, Langhorne, United States,
Abstract: This paper studies the redundancy of a tied-arch bridge using a 3-dimensional finite element computer model. By using static incremental loading simulation, a tied-arch bridge designed for the HS20 loading is able to carry the full dead load plus a live load of 130% HS20 loading even when one of the two ties is totally fractured. However, if the impulse effect due to sudden fracture of a tie is taken into consideration, the dynamic magnification factor is much higher than that commonly used in the static incremental study. The after-fracture dynamic behavior of the structure and the applicability of the AASHTO impact factor formula are also studied.
Subject Headings: Finite element method | Computer models | Dead loads | Live loads | Dynamic loads | Arch bridges | Arches
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