Safety Analysis of Steel Building Frames Under Dynamic Wind Loading

by Nirmal K. Das, Structural Engineer; United States,
James R. McDonald, Structural Engineer; United States,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


A method is presented for evaluating the lifetime risk of failure, in terms of probability of excessive inter-floor deflection, for a class of steel building frames subjected to dynamic wind loading. Wind loads are generated by a simulation technique using a power law profile and a gust spectrum model. Governing differential equations of motion are solved by a step-by-step integration method with the assumption of shear beam model and ideal elastoplastic force-deformation relationship. Generation of artificial samples of wind loading and corresponding time-histories of response followed by statistical analysis is repeated for a range of mean wind speeds that are likely to occur at a given location over the design lifetime of the structure. Lower and upper bound story drifts of 0.25% and 0.50% of story height are considered in the calculations. Numerical examples illustrate the application of the method which serves as a convenient procedure for examining the adequacy of a conventional design.

Subject Headings: Steel frames | Wind loads | Safety | Dynamic structural analysis | Steel structures | Numerical methods | Structural safety | Failure analysis

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