Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Design, analysis and optimization of three-piece scissor-type mechanized crossing bridge structure using Design of Experiments (DOE) method

Document Type : Original Article

Authors
Asghar Mahdian 1
Behrooz Shahriari 1
Mohammad Kabiri 2
1 Associate professor, Faculty of Mechanics, Malek Ashtar University of Technology, Isfahan, Iran
2 M.Sc., Faculty of Mechanics, Malek Ashtar University of Technology, Isfahan, Iran
10.22065/jsce.2024.422639.3252
Abstract
In this research, the design and optimization of a three-piece mechanized scissor bridge with the ability to pass equipment through natural obstacles up to a distance of 30 meters is discussed. The bridge is modeled with a beam with I section and according to the classification document of loads passing through the bridge, it is subjected to standard static loading and is analyzed by design relationships and Abaqus software with stress and weight criteria. By examining the finite element solution results based on Von Mises criterion, critical areas and unusual deformations are investigated. The design parameters of the bridge are obtained by the central cube method using the method of designing experiments and optimization is done. The results show that to implement the bridge on the M60A1 chassis, the static balance of the chassis must be maintained during the bridging operation, and there are two methods for this. In the first method, the distance of the center of gravity of the chassis from the starting mechanism should be increased to increase the effect of the torque of the chassis compared to the fully open bridge, so the specified auxiliary load of 8 to 10 tons is attached to the chassis as a spare. In the second method, the bridge is designed on a trailer and the launch mechanism is removed from the chassis. The chassis as an auxiliary force in the static balance of the trailer has an effect when bridging. In this case, the loading can be upgraded from the MLC60 category to higher categories by redesigning the model. The optimization of the bridge structure by the method of designing experiments indicates a 30% reduction in the weight of the bridge and achieving a reliability factor of 1.6, and it shows its efficiency in the design of similar bridges
Keywords
Mechanized crossing bridge
Three-piece scissor-type
Design and analysis
Optimization
Design of experiments

Subjects

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  • Receive Date 12 June 2024
  • Revise Date 18 August 2024
  • Accept Date 26 September 2024