Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Study of horizontally curved bridge girders with tubular top flanges
A system of I-shaped steel plate girders [i.e., conventional I-girders (IGs)] with cross frames between girders is widely used in curved bridges in the USA. A conventional IG has low torsional stiffness and strength, so before it is braced by cross frames, it develops large deformations and stresses under its own weight if unsupported within the span; temporary shoring is usually required during erection of a curved conventional IG bridge. An I-shaped girder with a hollow tube as the top flange (i.e., a TFG1) has larger torsional stiffness and strength than a conventional IG, resulting in improved behaviour and simpler curved bridge erection. In this paper, curved TFG1 bridge systems are analysed and compared with corresponding conventional IG systems. The advantages of curved TFG1 systems are (1) individual curved TFG1s have smaller deformations and stresses than corresponding conventional IGs during erection, and can carry their weight across the span without temporary shoring or bracing within the span; (2) curved TFG1 systems have smaller second-order effects than corresponding conventional IG systems; (3) curved TFG1 systems require lighter cross sections or fewer interior cross frames than corresponding conventional IG systems.
Study of horizontally curved bridge girders with tubular top flanges
A system of I-shaped steel plate girders [i.e., conventional I-girders (IGs)] with cross frames between girders is widely used in curved bridges in the USA. A conventional IG has low torsional stiffness and strength, so before it is braced by cross frames, it develops large deformations and stresses under its own weight if unsupported within the span; temporary shoring is usually required during erection of a curved conventional IG bridge. An I-shaped girder with a hollow tube as the top flange (i.e., a TFG1) has larger torsional stiffness and strength than a conventional IG, resulting in improved behaviour and simpler curved bridge erection. In this paper, curved TFG1 bridge systems are analysed and compared with corresponding conventional IG systems. The advantages of curved TFG1 systems are (1) individual curved TFG1s have smaller deformations and stresses than corresponding conventional IGs during erection, and can carry their weight across the span without temporary shoring or bracing within the span; (2) curved TFG1 systems have smaller second-order effects than corresponding conventional IG systems; (3) curved TFG1 systems require lighter cross sections or fewer interior cross frames than corresponding conventional IG systems.
Study of horizontally curved bridge girders with tubular top flanges
Ma, Haiying (Autor:in) / Sause, Richard (Autor:in)
Structure and Infrastructure Engineering ; 12 ; 786-800
02.06.2016
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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