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RISS 인기검색어
- 검색키워드
- 저자 : Xiongwei Shi (검색결과 2 건)
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Improved definition of dynamic load allowance factor for highway bridges
Zhou, Yongjun,Ma, Zhongguo John,Zhao, Yu,Shi, Xiongwei,He, Shuanhai Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.3
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.
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Improved definition of dynamic load allowance factor for highway bridges
Yongjun Zhou,Zhongguo John Ma,Yu Zhao,Xiongwei Shi,Shuanhai He 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.3
The main objective of this paper is to study the dynamic load allowance (DLA) calculationmethods for bridges according to the dynamic response curve. A simply-supported concrete bridge with asmooth road surface was taken as an example. A half-vehicle model was employed to calculate the dynamicresponse of deflection and bending moment in the mid-span section under different vehicle speeds using thevehicle-bridge coupling method. Firstly, DLAs from the conventional methods and code provisions wereanalyzed and critically evaluated. Then, two improved computing approaches for DLA were proposed. Inthe first approach, the maximum dynamic response and its corresponding static response or itscorresponding minimum response were selected to calculate DLA. The second approach utilized weightedaverage method to take account of multi-local DLAs. Finally, the DLAs from two approaches werecompared with those from other methods. The results show that DLAs obtained from the proposedapproaches are greater than those from the conventional methods, which indicate that the currentconventional methods underestimate the dynamic response of the structure. The authors recommend that theweighted average method based on experiments be used to compute DLAs because it can reflect thevehicle’s whole impact on the bridge.
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