Effect of the Traffic Load Distribution on the Progressive Collapse of a Cable-Stayed Bridge Under Blast Load

다국어 초록 (Multilingual Abstract)

The advanced coupled fi nite element models can be used to model the structures and the extreme load of air blast as well as the interaction between them. However, the structural response of long-span bridges can be signifi cantly infl uenced by the magnitude and location of blast load and pattern and magnitude of traffi c load along and across the deck. In addition, the previous studies considered the cable loss when the bridge is intact, however the damage of explosion on a bridge causes new deformation and characteristics. Accordingly, in this study, the eff ect of fi ve diff erent traffi c loading cases has been investigated on the maximum response of a cable-stayed bridge under eight diff erent blast scenarios and the possibility of progressive collapse has been evaluated. It is concluded that the traffi c load confi gurations on the bridge can vary maximum actions on diff erent components up to 30%. Cable loss or anchorage zone destruction under blast loading scenarios are observed independent of the traffi c load distribution. Meanwhile, the progressive collapse of bridge due to cable loss likely occurs in a number of the blast scenarios. Moreover, the vulnerability of more than one cable loss is clearly observed in some cases and designing bridges based on only one cable loss is not safe if the occurrence of hazards on the bridge is unavoidable. Besides, two symmetric traffi c loading scenarios (i.e. 50% of traffi c load applied on the entire bridge, and 50% of the traffi c load only applied on middle span) are identifi ed as the most critical in terms of the bridge components response.

참고문헌 (Reference)

1 Paik, J. K., "Ultimate Limit State Design of Steel-Plated Structures" Wiley 2003

2 Dawe, P., "Traffic Loading on Highway Bridges" Thomas Telford Publishing 2003

3 Hashemi, S. K., "The strain-rate effects on the numerical simulation of steel beams under blast loads" 311-321, 2014

4 Tetougueni, C. D., "Structural performance of a steel cable-stayed bridge under blast loading considering different stay patterns" 219 : 110739-, 2020

5 Shoghijavan, M., "Structural Robustness of Long-Span Cable-Supported Bridges in a Cable-Loss Scenario" 23 (23): 04017133-, 2018

6 Cowper, G. R., "Strain-hardening and strainrate effects in the impact loading of cantilever beams"

7 Fang, C., "Simplified energy-based robustness assessment for steelcomposite car parks under vehicle fire" 49 : 719-732, 2013

8 Fang, C., "Robustness of steel-composite building structures subject to localised fire" 46 (46): 348-363, 2011

9 PTI, "Recommendations for Stay-Cable Design, Testing and Installation"

10 Mozos, C. M., "Parametric study on the dynamic response of cable stayed bridges to the sudden failure of a stay, Part I : Bending moment acting on the deck" 32 (32): 3288-3300, 2010

11 Tang, E. K. C., "Numerical simulation of a cablestayed bridge response to blast loads, Part I : Model development and response calculations" 32 (32): 3180-3192, 2010

12 Jama, H. H., "Numerical modelling of square tubular steel beams subjected to transverse blast loads" 47 (47): 1523-1534, 2009

13 Lee, J., "Numerical analysis-based blast resistance performance assessment of cable-stayed bridge components subjected to blast loads" 10 (10): 8511-, 2020

14 LSTC, "LS-DYNA Version 970 Keyword User's Manual"

15 AASHTO, "LRFD Bridge Design Specifi cations"

16 Samali, B., "Effect of loading pattern and deck confi guration on the progressive collapse response of cable-stayed bridges" 16 (16): 17-34, 2015

17 Hashemi, S. K., "Dynamic response of cable-stayed bridge under blast load" 127 : 719-736, 2016

18 Hashemi, S. K., "Dynamic response and performance of cable-stayed bridges under blast load : Effects of pylon geometry" 137 : 50-66, 2017

19 Zoli, T, "Design of long span bridges for cable Loss" 2005

20 Wolff, M., "Cable loss and progressive collapse in cable-stayed bridges" 5 (5): 17-28, 2009

21 Wang, W., "Analysis of a bridge collapsed by an accidental blast loads" 36 : 353-361, 2014

22 Winget, D. G., "Analysis and design of critical bridges subjected to blast loads" ASCE 131 (131): 1243-1255, 2005

23 "AS5100. Bridge Design"

24 Aoki, Y., "A study on potential progressive collapse responses of cable-stayed bridges" 16 (16): 689-706, 2013