Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical Assessment of Design Procedures for Overhanging Steel Girders
In the design of roof structures for large single-storey buildings, it is common practice to extend the primary girders of alternate bays beyond the columns to support the girders in the other bays, the span of which is adjusted to balance the moment distribution along the girder line. This structural system, typically with open-web steel joists constituting the secondary members, is commonly known as Gerber construction. Despite the common use of the Gerber system, concerns have arisen about how designers evaluate the stability of overhanging girders, as contemporary steel design standards remain mostly silent on how to take into account the interaction between the back span and the cantilever. The main objective of this paper is to provide new insights into the stability response and design of overhanging girders. Commonly used design procedures for overhanging girders used to assess the limit state of lateral–torsional buckling are first discussed. A finite-element model capable of considering material and geometric nonlinearities, residual stresses, initial out-of-straightness, and cross-sectional distortions is then utilised to obtain the buckling resistances of a practical range of overhanging girders. It is assumed that the back span is under top-flange loading, and open-web steel joists provide only lateral restraints to the main girder. Three different restraint conditions are considered at the cantilever tip: free, lateral restraint at the top flange, and lateral restraint at both the top and bottom flanges. Finally, the results are compared to the predictions of available design procedures. The results suggest that the current methods may lead to overly conservative or unconservative predictions, as they either overlook the role of interaction between the back span and the cantilever or miscalculate the beneficial effect of top-flange bracing on the stability of the back span under reverse-curvature bending.
Numerical Assessment of Design Procedures for Overhanging Steel Girders
In the design of roof structures for large single-storey buildings, it is common practice to extend the primary girders of alternate bays beyond the columns to support the girders in the other bays, the span of which is adjusted to balance the moment distribution along the girder line. This structural system, typically with open-web steel joists constituting the secondary members, is commonly known as Gerber construction. Despite the common use of the Gerber system, concerns have arisen about how designers evaluate the stability of overhanging girders, as contemporary steel design standards remain mostly silent on how to take into account the interaction between the back span and the cantilever. The main objective of this paper is to provide new insights into the stability response and design of overhanging girders. Commonly used design procedures for overhanging girders used to assess the limit state of lateral–torsional buckling are first discussed. A finite-element model capable of considering material and geometric nonlinearities, residual stresses, initial out-of-straightness, and cross-sectional distortions is then utilised to obtain the buckling resistances of a practical range of overhanging girders. It is assumed that the back span is under top-flange loading, and open-web steel joists provide only lateral restraints to the main girder. Three different restraint conditions are considered at the cantilever tip: free, lateral restraint at the top flange, and lateral restraint at both the top and bottom flanges. Finally, the results are compared to the predictions of available design procedures. The results suggest that the current methods may lead to overly conservative or unconservative predictions, as they either overlook the role of interaction between the back span and the cantilever or miscalculate the beneficial effect of top-flange bracing on the stability of the back span under reverse-curvature bending.
Numerical Assessment of Design Procedures for Overhanging Steel Girders
Lecture Notes in Civil Engineering
Gupta, Rishi (Herausgeber:in) / Sun, Min (Herausgeber:in) / Brzev, Svetlana (Herausgeber:in) / Alam, M. Shahria (Herausgeber:in) / Ng, Kelvin Tsun Wai (Herausgeber:in) / Li, Jianbing (Herausgeber:in) / El Damatty, Ashraf (Herausgeber:in) / Lim, Clark (Herausgeber:in) / Esmaeili, Vahab (Autor:in) / Imanpour, Ali (Autor:in)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Kapitel: 16 ; 223-241
06.08.2023
19 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Calibration of Design Procedures for Steel Plate Girders
| British Library Online Contents | 1997
Calibration of Design Procedures for Steel Plate Girders
| SAGE Publications | 1997