![]() Lateral movement limitations, such as the case of whole building drift limitations, are more clearly defined in the IBC and ASCE/SEI 7, Minimum Design Loads for Buildings and Other Structures, and are not subject to creep, varying superimposed loads, or long-term deflection effects. This article is focused only on issues associated with vertical deflections. The structural engineer will need to understand how the enclosure is expected to behave during construction and throughout the service life of the building to design a structural frame that properly accommodates the movement limitations of the building enclosure. Enclosure systems and framing systems exhibit unique behaviors, and interaction and structural behavior between them may not be adequately accommodated using customary span-to-deflection ratios. The IBC provides deflection limitations based only on the span of the structural member however, more restrictive limitations may govern based on properties of the building enclosure system or architectural vertical movement joint details. ![]() For example, what are the deflection limits for spandrel beams or slab edges that support the building enclosure? ![]() ![]() While a particular structural design is required to satisfy the IBC, as well as material design standards and public safety requirements, the IBC does not directly address the effects of the vertical movement of the building structure on the building enclosure. The International Building Code (IBC) and design standards used by structural engineers are developed with the intent to provide minimum requirements for the design and construction of a structure to help assure the public health, safety, and welfare. ![]()
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