Seismic - Wood Diaphragm Design for Out of Plane Wall Anchorage

This course has been discontinued.

This course will explain the design and detailing of subdiaphragms for a flexible roof system using ASCE 7-10 Section 12.11 Structural Walls and Their Anchorage. Many low rise buildings are constructed with heavy walls of masonry or concrete and light wood roofs or floors. During an earthquake the light roof framing must stabilize the heavy walls as those walls move out of plane. IBC 2012 and ASCE 7-10 require that the roofs and floors be designed to transfer the out of plane wall forces through the diaphragm using the subdiaphragm concept. This course will show you how to develop the demand on the diaphragm, calculate the capacity of the framing members and detail the members to achieve this load transfer.

• Identify the generation of the seismic inertia forces for heavy walls supported by flexible diaphragms
• Calculate seismic out-of-plane wall forces
• Apply the subdiaphragm concept to distribute those forces through the flexible diaphragm
• Evaluate alternatives to create the best layout
• Review possible code modifications to better address the issue