Second Order Analysis of a 47-Story Building

by Larry Griffis, Walter P. Moore & Associates, Inc, Houston, TX, USA,
Ali Haris, Walter P. Moore & Associates, Inc, Houston, TX, USA,
Javier Horvilleur, Walter P. Moore & Associates, Inc, Houston, TX, USA,

Document Type: Proceeding Paper

Part of: Materials and Member Behavior


A modern day second order analysis and ultimate strength review is made of a hypothetical 47-story unbraced frame designed under the 1969 AISC Specification. The original design is part of a study of high rise building structural schemes in use in the late 1960's. The paper discusses in detail the design assumptions of the original frame. A discussion is made of the AISC interaction equations and some of the possible pitfalls in their usage. A reanalysis of the frame is made using an iterative P-Delta procedure and a one-step P-Delta analysis using modern day frame analysis programs that directly account for the P-Delta effect. An ultimate strength study is performed on the frame using an analytical approach developed at Lehigh University to estimate the true 'safety factor' of the original design.

Subject Headings: Building design | Frames | Tensile strength | Steel structures | Structural strength | Structural design | Structural analysis

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