ICC-ES AC238
Full Name
ICC-ES AC238 – Acceptance Criteria for Buckling-restrained Braced Frame Subassemblages
Scope
ICC-ES AC238 outlines the acceptance criteria for evaluating buckling-restrained braced frame (BRBF) subassemblages used in building construction. These subassemblages are designed to resist lateral loads, such as those caused by earthquakes or wind, while mitigating the risk of buckling in the braces.
Key aspects covered by AC238 include:
- Component materials: it specifies the acceptable materials for the various components of BRBF subassemblages, including the braces, gusset plates, connections, and restraining elements.
- Design and fabrication: it outlines requirements for the design and fabrication of BRBF subassemblages, ensuring they comply with applicable building codes and standards. This includes specifying the geometry, dimensions, and connection details of the components.
- Performance testing: it details standardized testing protocols to assess the structural performance of BRBF subassemblages under cyclic loading, simulating the effects of earthquakes or wind. The tests evaluate the strength, stiffness, energy dissipation capacity, and overall stability of the subassemblages.
- Acceptance criteria: it establishes specific performance criteria that BRBF subassemblages must meet to be considered compliant with the acceptance criteria. These criteria typically involve limits on deformation, strength degradation, and other performance parameters under cyclic loading.
By adhering to AC238, manufacturers can demonstrate that their BRBF subassemblages meet the necessary safety and performance standards. This provides confidence to building officials, engineers, and contractors that the subassemblages are suitable for use in seismic and wind-resistant designs.
Resources
Keywords
buckling-restrained braced frame; brbf; subassemblages; acceptance criteria; cyclic loading; seismic loads; wind loads; deformation; strength degradation; energy dissipation; gusset plates; connections