Blast-Loading Effects on Structural Redundancy of Long-Span Suspension Bridge Using a Simplified Approach
Publication: Practice Periodical on Structural Design and Construction
Volume 27, Issue 3
Abstract
Long-span suspension bridges are typically designed against wind and earthquake loadings without considering blast loads because existing blast-resistant design guidelines for bridges are limited and in fact not detailed enough to fully explicate the consequences of a blast event. This study performed detailed dynamic analysis of a long-span suspension bridge to parametrically evaluate its structural redundancy under small to large blasts detonated at different locations. To accomplish this, the blast-structure interaction problem was solved by a simplified approach whereby the blast aspect was modeled as nodal loads by simulating the pressure contour area on the deck surface caused by the explosion; the structural aspect was modeled as a three-dimensional fishbone skeleton finite-element model. In particular, major attention was paid to the blast load effects on the main cable and hangers designed at safety factors of 2.2 and 2.5, respectively. This study concluded that the main cable and hangers show sufficient and insufficient structural redundancies, respectively under small to medium blasts, whereas a large blast was proven to be detrimental to both the main cable and hangers, which may further trigger progressive collapse of the entire suspension bridge.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. The item list includes (1) sample codes for the blast load model; and (2) the finite-element model of the suspension bridge.
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Published In
Practice Periodical on Structural Design and Construction
Volume 27 • Issue 3 • August 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Oct 18, 2021
Accepted: Jan 29, 2022
Published online: Mar 30, 2022
Published in print: Aug 1, 2022
Discussion open until: Aug 30, 2022
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Cited by
- Khawaja Ali, Aleena Saleem, Ali Javed, Bushra Khadim, Ajibola Ibrahim Quadri, A Simplified Approach for Dynamic Analysis of Suspension Bridges under Extreme Limit State, Practice Periodical on Structural Design and Construction, 10.1061/PPSCFX.SCENG-1523, 29, 4, (2024).
- Khawaja Ali, New Mathematical Formulation of Nonlinear Unsteady Wind Loads on Long-Span Bridge Decks under Nonstationary Winds Using Time-Delay Neural Network, Journal of Structural Engineering, 10.1061/(ASCE)ST.1943-541X.0003476, 148, 10, (2022).