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Structural Engineering and Mechanics Volume 54, Number 3, May10 2015 , pages 561-577 DOI: https://doi.org/10.12989/sem.2015.54.3.561 |
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Improved definition of dynamic load allowance factor for highway bridges |
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Yongjun Zhou, Zhongguo John Ma, Yu Zhao, Xiongwei Shi and Shuanhai He
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| Abstract | ||
| The main objective of this paper is to study the dynamic load allowance (DLA) calculation methods for bridges according to the dynamic response curve. A simply-supported concrete bridge with a smooth road surface was taken as an example. A half-vehicle model was employed to calculate the dynamic response of deflection and bending moment in the mid-span section under different vehicle speeds using the vehicle-bridge coupling method. Firstly, DLAs from the conventional methods and code provisions were analyzed and critically evaluated. Then, two improved computing approaches for DLA were proposed. In the first approach, the maximum dynamic response and its corresponding static response or its corresponding minimum response were selected to calculate DLA. The second approach utilized weighted average method to take account of multi-local DLAs. Finally, the DLAs from two approaches were compared with those from other methods. The results show that DLAs obtained from the proposed approaches are greater than those from the conventional methods, which indicate that the current conventional methods underestimate the dynamic response of the structure. The authors recommend that the weighted average method based on experiments be used to compute DLAs because it can reflect the vehicle\'s whole impact on the bridge. | ||
| Key Words | ||
| dynamic load allowance (DLA); vehicle-bridge coupling; vehicle oscillation; weighted average method; bridges | ||
| Address | ||
| Yongjun Zhou: Department of Highway School, Chang\'an University, Middle Section of Nan Erhuan Road, Xi\'an, 710064, China Zhongguo John Ma: Department of Civil and Environmental Engineering, University of Tennessee Knoxville, 313 John D. Tickle Building, Knoxville, TN 37996-2313, USA Yu Zhao: Department of Highway School, Chang\'an University, Middle Section of Nan Erhuan Road, Xi\'an, 710064, China Xiongwei Shi: Xi\'an Highway Research Institute, South Wenyi Road, Xi\'an, 710054, China Shuanhai He: Department of Highway School, Chang\'an University, Middle Section of Nan Erhuan Road, Xi\'an, 710064, China | ||