A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Optimum design methodology for elevated transit structures. Final report
The need to design efficient supporting structures with minimal vibration response for use in modern transit vehicle systems generated this study. The methodologies presented herein purport to aid the designer in producing advanced-concept, minimum cost, urban transit structures with high strength to weight ratios, which also have aesthetic appeal and afford a high degree of ride comfort. This report is organized into 4 sections. In Chapter 1, optimal pier spacings for uniform spans are predicted; 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 to simple spans end-to-end. In Chapter 2,similar results are found for uniform, continuous, inertialess spans, where the tranit 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; extensive use is made of computer graphics to illustrate the design methodology. In Chapter 4, 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. The author concludes that the most efficient designs are continuous span configurations with a minimum number of pier supports properly spaced so that balanced stresses are achieved. (Jensen)
Optimum design methodology for elevated transit structures. Final report
The need to design efficient supporting structures with minimal vibration response for use in modern transit vehicle systems generated this study. The methodologies presented herein purport to aid the designer in producing advanced-concept, minimum cost, urban transit structures with high strength to weight ratios, which also have aesthetic appeal and afford a high degree of ride comfort. This report is organized into 4 sections. In Chapter 1, optimal pier spacings for uniform spans are predicted; 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 to simple spans end-to-end. In Chapter 2,similar results are found for uniform, continuous, inertialess spans, where the tranit 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; extensive use is made of computer graphics to illustrate the design methodology. In Chapter 4, 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. The author concludes that the most efficient designs are continuous span configurations with a minimum number of pier supports properly spaced so that balanced stresses are achieved. (Jensen)
Optimum design methodology for elevated transit structures. Final report
Optimierte Konstruktionsrichtlinien fuer Hochstrassen. Abschliessender Bericht
Wilson, J.F. (author)
US Government Reports ; 1-146
1981
146 Seiten
Report
English
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