AISI S907
Full Name
AISI S907 – Test Standard for Determining the Strength and Stiffness of Cold-Formed Steel Diaphragms by the Cantilever Test Method
Scope
AISI S907 is a standardized test method developed by the American Iron and Steel Institute (AISI) for evaluating the shear strength and stiffness of cold-formed steel diaphragms. These diaphragms, commonly used in steel-framed buildings, play a crucial role in resisting lateral loads such as wind and seismic forces. The standard outlines a cantilever test setup, which provides a practical and reliable means to assess diaphragm performance.
Key features of the test method:
- Cantilever setup: the test specimen, representing a section of the diaphragm, is fixed at one end (base) and subjected to a lateral load at the free end (top). This simulates the diaphragm’s behavior when resisting lateral forces in a building.
- Load application: the load is applied incrementally and may be either monotonic (continuously increasing) or cyclic (repetitive loading and unloading) depending on the specific requirements.
- Measurement and data acquisition: deflection at the free end and the corresponding applied load are continuously monitored and recorded throughout the test. Strain gauges may also be used to measure strain in the diaphragm and fasteners.
- Strength and stiffness determination: the test data is analyzed to determine the diaphragm’s ultimate shear strength (maximum load capacity) and shear stiffness (resistance to deformation). These parameters are essential for structural design and ensuring the diaphragm’s ability to effectively transfer lateral loads.
Significance of AISI S907:
- Standardized evaluation: the standard provides a uniform and consistent method for evaluating cold-formed steel diaphragm performance, enabling comparison of different diaphragm designs and materials.
- Design guidance: the test results obtained from AISI S907 are crucial for engineers in designing safe and efficient diaphragm systems for steel-framed buildings.
- Quality control: the standard serves as a quality control tool for manufacturers of cold-formed steel diaphragms, ensuring that their products meet the required performance standards.
AISI S907 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the AISI S907 standard. We offer comprehensive testing services, including specimen preparation, load application, data acquisition, and analysis, in accordance with the standard’s requirements. Our accurate and reliable test results provide valuable insights into diaphragm performance, assisting engineers and manufacturers in optimizing designs and ensuring the structural integrity of steel buildings.
Contact us today to learn more about our testing services and how we can help you meet your project needs.
Resources
Keywords
cold-formed steel diaphragms; cantilever test; strength; stiffness; shear strength; deflection; load-displacement curve; yield strength; ultimate strength; elastic modulus; shear modulus; aspect ratio; panel thickness; connection details; bracing