Structural Engineering and Mechanics

  • 제54권3호
  • /
  • Pages.561-577
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  • 2015
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Improved definition of dynamic load allowance factor for highway bridges

  • Zhou, Yongjun (Department of Highway School, Chang'an University) ;
  • Ma, Zhongguo John (Department of Civil and Environmental Engineering, University of Tennessee Knoxville) ;
  • Zhao, Yu (Department of Highway School, Chang'an University) ;
  • Shi, Xiongwei (Xi'an Highway Research Institute) ;
  • He, Shuanhai (Department of Highway School, Chang'an University)
  • 투고 : 2014.07.21
  • 심사 : 2015.03.04
  • 발행 : 2015.05.10
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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