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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