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A platform for research: civil engineering, architecture and urbanism
Optimum design methodology for elevated transit structures. Executive summary
Methodologies are investigated for designing high efficiency, elevated, urban guideways. The most efficient spans are continuous where the pier supports, bending stiffness and unit mass are optimally distributed. Calculations lead to spans of least overall weight, balanced peak stresses under all loading, and minimum rms vertical deflection for the vehicle trajectories. The study is in four parts. In Chapter 1, optimal pier spacings for uniform spans are predicted, where span inertia effects are included. Calculated optimal span responses to constant loads at constant speed, verified experimentally, show a peak stress reduction of up to 30 percent, compared tosimple spans end-to-end. In Chapter 2, similar results are found for uniform, continuous, inertialess, spans where the transit mass is much larger than the span mass. In Chapter, 3, the effects on span efficiency of the nonuniform stiffness and unit mass parameters are investigated, where extensive use is made of computer graphics to illustrate the design methodology. In Chapter Four, the Duke University transit system is the reference case used for alternative design studies, where up to 40 percent reductions in concrete weight are possible. These methodologies can be successively employed to minimize urban guideway costs through weight reduction. The optimal spans are slim, aesthetic structures, affording high degrees of passenger ride comfort. (Jensen)
Optimum design methodology for elevated transit structures. Executive summary
Methodologies are investigated for designing high efficiency, elevated, urban guideways. The most efficient spans are continuous where the pier supports, bending stiffness and unit mass are optimally distributed. Calculations lead to spans of least overall weight, balanced peak stresses under all loading, and minimum rms vertical deflection for the vehicle trajectories. The study is in four parts. In Chapter 1, optimal pier spacings for uniform spans are predicted, where span inertia effects are included. Calculated optimal span responses to constant loads at constant speed, verified experimentally, show a peak stress reduction of up to 30 percent, compared tosimple spans end-to-end. In Chapter 2, similar results are found for uniform, continuous, inertialess, spans where the transit mass is much larger than the span mass. In Chapter, 3, the effects on span efficiency of the nonuniform stiffness and unit mass parameters are investigated, where extensive use is made of computer graphics to illustrate the design methodology. In Chapter Four, the Duke University transit system is the reference case used for alternative design studies, where up to 40 percent reductions in concrete weight are possible. These methodologies can be successively employed to minimize urban guideway costs through weight reduction. The optimal spans are slim, aesthetic structures, affording high degrees of passenger ride comfort. (Jensen)
Optimum design methodology for elevated transit structures. Executive summary
Optimierte Konstruktionsrichtlinien fuer Hochstrassen. Endgueltige Richtlinien
Wilson, J.F. (author)
US Government Reports ; 1-12
1981
12 Seiten
Report
English
Optimum design methodology for elevated transit structures. Final report
| Tema Archive | 1981
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| ASCE | 2021
Wiley | 2002