Nonbuilding Structures and Nonstructural Components

Single Abstract

339941 - Deflection Analysis of High Performance, Exterior Wall Systems

Friday, April 20
9:30 AM - 10:30 AM
Location: 201C

Since the 1970’s, traditional curtain wall engineering has used Allowable Stress Design (ASD) level wind loads as its basis for design. Most curtain walls in this country have been engineered to resist wind loads based on a 50 year mean recurrence interval (MRI) for both strength and serviceability limit states. Hospitals and other buildings of higher importance have been engineered to 100 year MRI wind loads.
In discussing serviceability and designing for maximum likely events, the Commentary section of ASCE -7 1998 suggested a 10-year recurrence interval might be reasonable for human comfort considerations. The International Building Code added new discussion of Serviceability based on this Commentary in the 2000 Code. Section 1604.3 of that Code addresses serviceability design of structural systems and members thereof with reference to Table 1604.3, and footnote f. to the Table permits a reduction to ASD wind loads by a factor of 0.7 for deflection analysis.

This use of reduced wind loads has long been the common practice for design of cold formed steel framing and it is increasingly becoming the trend in engineering of aluminum curtain wall framing. This paper discusses the high performance demands of curtain walls and other cladding systems that form the exterior envelope of today's buildings and provides specific issues of concern to be considered before using the reduction to wind load as permitted by the Code.

Jim H. Larkin

Senior Associate
Curtain Wall Design Consulting, Inc.

Jim Larkin is a graduate civil engineer from Texas A & M University , class of 1978. He joined CDC in 1986 and is now a registered PE in 8 states. As part of CDC, Jim has been providing engineering and consulting services related to the performance of exterior cladding systems to Contractors, Architects, and Building Owners, on buildings around the world, for over 30 years.

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