Plastic Analysis and Design of Steel Structures

Elsevier Ltd. | ISBN: 978-0-7506-8298-5 | English | PDF | Pages: 257 | Size: 5.46 MB

Preface
The plastic method has been used extensively by engineers for the design of steel structures, including simple beams, continuous beams, and simple portal frames. Traditionally, the analysis is based on the rigid-plastic theory whereby the plastic collapse load is evaluated through virtual work formulation in which elastic deflection is ignored. For more complex frames, specialist computer packages for elastoplastic analysis are usually employed. Current publications on plastic design method provide means of analysis based on either virtual work formulation or sophisticated plastic theory contained in specialist computer packages. This book aims to bridge this gap. The advent of computers has enabled practicing engineers to perform linear and nonlinear elastic analysis on a daily basis using computer programs widely available commercially. The results from computer analysis are transferred routinely to tools with automated calculation formats such as spreadsheets for design. The use of this routine procedure is commonplace for design based on elastic, geometrically nonlinear analysis. However, commercially available computer programs for plastic analysis are still a rarity among the engineering community. This book emphasizes a plastic analysis method based on the hinge by hinge concept. Frames of any degree of complexity can be analyzed plastically using this method. This method is based on the elastoplastic analysis procedure where a linear elastic analysis, performed either manually or by computers, is used between the formation of consecutive plastic hinges. The results of the linear elastic analysis are used in a proforma created in a spreadsheet environment where the next plastic hinge formation can be predicted automatically and the corresponding culmulative forces and deflections calculated. In addition, a successive approximation method is described to take account of the effect of force interaction on the evaluation of the collapse load of a structure. This method can be performed using results from
analysis obtained from most commercially available computer programs.

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