Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Improvement of Steel Bridge Ratings Using Autostress Concept: A Feasibility Study
In an effort to make the ratings of older bridges compatible with today's increased truck loads, the most cost-effective solution would be to re-rate the bridges using a higher level analysis. The Autostress procedure, a design method that permits continuous steel bridges to experience a partial plastic hinge at the pier and a subsequential redistribution of moment from the negative region to the positive region via the Automoment, is one such analysis. The research is attempted to adapt the Autostress design procedure for new bridges to an Autostress rating procedure for existing bridges. An Autostress rating flow chart was developed and used to rate three bridges: a two-span non-composite, a two-span composite, and a three-span composite. The same bridges were then rated using the Load Factor Rating procedure. The two ratings were compared for each bridge to determine if a preliminary upgrading rating factor could be formed. It was concluded that since most existing continuous steel bridges have cover plates it is not feasible to develop a preliminary upgrading rating factor for load factor rated bridges.
Improvement of Steel Bridge Ratings Using Autostress Concept: A Feasibility Study
In an effort to make the ratings of older bridges compatible with today's increased truck loads, the most cost-effective solution would be to re-rate the bridges using a higher level analysis. The Autostress procedure, a design method that permits continuous steel bridges to experience a partial plastic hinge at the pier and a subsequential redistribution of moment from the negative region to the positive region via the Automoment, is one such analysis. The research is attempted to adapt the Autostress design procedure for new bridges to an Autostress rating procedure for existing bridges. An Autostress rating flow chart was developed and used to rate three bridges: a two-span non-composite, a two-span composite, and a three-span composite. The same bridges were then rated using the Load Factor Rating procedure. The two ratings were compared for each bridge to determine if a preliminary upgrading rating factor could be formed. It was concluded that since most existing continuous steel bridges have cover plates it is not feasible to develop a preliminary upgrading rating factor for load factor rated bridges.
Improvement of Steel Bridge Ratings Using Autostress Concept: A Feasibility Study
D. S. Ellifritt (Autor:in) / M. S. Hampton (Autor:in)
1988
79 pages
Report
Keine Angabe
Englisch
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