Probabilistic numerical evaluation of dynamic load allowance factors in steel modular bridges using a vehicle-bridge interaction model

2021 ◽  
Vol 226 ◽  
pp. 111316
Author(s):  
P.A. Montenegro ◽  
J.M. Castro ◽  
R. Calçada ◽  
J.M. Soares ◽  
H. Coelho ◽  
...  
Keyword(s):  
Dynamic Load ◽  
Numerical Evaluation ◽  
Interaction Model ◽  
Dynamic Load Allowance

Dynamic load allowance

2021 ◽  
pp. 87-110
Author(s):  
Jennifer Keenahan ◽  
Eugene OBrien ◽  
Aleš Žnidarič ◽  
Jan Kalin
Keyword(s):  
Dynamic Load ◽  
Dynamic Load Allowance

Dynamic Field Performance of Glued Laminated Timber Bridges

2005 ◽  
Vol 1928 (1) ◽  
pp. 154-164
Author(s):  
Jake Bigelow ◽  
Brent Phares ◽  
Terry Wipf ◽  
Mike Ritter ◽  
Doug Wood
Keyword(s):  
Dynamic Load ◽  
Dynamic Performance ◽  
Field Performance ◽  
Performance Data ◽  
Girder Bridges ◽  
Dynamic Field ◽  
Dynamic Load Allowance ◽  
Glued Laminated Timber ◽  
National Programs ◽  
Timber Bridges

To use and develop timber structures in transportation better, the U.S. government implemented several national programs starting in the early 1990s to address the needs of the timber industry. One need was to investigate the dynamic field performance of timber bridges in relation to vehicular loading. The AASHTO load and resistance factor design specifications recommend a dynamic load allowance of 0.165 for timber bridges. To investigate this codified value, research was needed to determine the dynamic characteristics of timber bridges and to study their dynamic performance. To obtain dynamic performance data, five glued laminated girder bridges and four longitudinal glued laminated panel bridges were selected for testing. The testing involved loading the nine structures to obtain dynamic performance data including deflection and acceleration, as well as to assess the overall condition state of the bridges. The nine bridges tested were found to have fundamental frequencies between 5 Hz and 11 Hz as well as a dynamic load allowance of less than 0.25. The bridges found to have dynamic amplifications above specified code values were also found to have physical characteristics (i.e., rough entrances) that likely caused the higher dynamic amplification values.

Dynamic Load Allowance for Through-Truss Bridges

1999 ◽  
Vol 4 (4) ◽  
pp. 231-241 ◽  
Author(s):  
J. A. Laman ◽  
J. S. Pechar ◽  
T. E. Boothby
Keyword(s):  
Dynamic Load ◽  
Truss Bridges ◽  
Dynamic Load Allowance

Improved definition of dynamic load allowance factor for highway bridges

2015 ◽  
Vol 54 (3) ◽  
pp. 561-577 ◽  
Author(s):  
Yongjun Zhou ◽  
Zhongguo John Ma ◽  
Yu Zhao ◽  
Xiongwei Shi ◽  
Shuanhai He
Keyword(s):  
Dynamic Load ◽  
Highway Bridges ◽  
Dynamic Load Allowance ◽  
Definition Of

scholarly journals Parametric Study on Dynamic Response of Fiber Reinforced Polymer Composite Bridges

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Woraphot Prachasaree ◽  
Attapon Sangkaew ◽  
Suchart Limkatanyu ◽  
Hota V. S. GangaRao
Keyword(s):  
Dynamic Response ◽  
Dynamic Load ◽  
Bridge Deck ◽  
Bridge Decks ◽  
Fiber Reinforced Polymer ◽  
Upper And Lower Bounds ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Dynamic Load Allowance ◽  
Bridge Models

Because of high strength and stiffness to low self-weight ratio and ease of field installation, fiber reinforced polymer (FRP) composite materials are gaining popularity as the materials of choice to replace deteriorated concrete bridge decks. FRP bridge deck systems with lower damping compared to conventional bridge decks can lead to higher amplitudes of vibration causing dynamically active bridge deck leading serviceability problems. The FRP bridge models with different bridge configurations and loading patterns were simulated using finite element method. The dynamic response results under varying FRP deck system parameters were discussed and compared with standard specifications of bridge deck designs under dynamic loads. In addition, the dynamic load allowance equation as a function of natural frequency, span length, and vehicle speed was proposed in this study. The proposed dynamic load allowance related to the first flexural frequency was presented herein. The upper and lower bounds’ limits were established to provide design guidance in selecting suitable dynamic load allowance for FRP bridge systems.

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