Impulse Effect on Redundancy of a Tied-Arch Bridge

by Leon L-Y. Lai, (A.M.ASCE), Rathyeon Engineers &, Constructors, Langhorne, United States,

Document Type: Proceeding Paper

Part of: Computing in Civil Engineering


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: Dead loads | Live loads | Arches | Bridges | Arch bridges | Finite element method | Computer models | Bridge design

Services: Buy this book/Buy this article


Return to search