High Strength Roof Diaphragms Plywod

Load capacities in table a are based on normal duration of load for untreated panels under dry conditions.

High strength roof diaphragms plywod.

The term diaphragm is usually applied to roofs and floors. Is high the current shear wall and diaphragm tables are based on a 2 8 min. 2018 disclaimer the advice provided in this publication is general in nature and is intended as a guide only. Staples are not recommended for roof sheathing attachment in high wind areas.

If roof sheathing is cut and removed to achieve an air slot continuity and diaphragm action are affected. Apa research reports 138 and 154. It has been noted that there is seldom a problem with the strength of diaphragms because failures are predominantly associated with the connections between a. A diaphragm structure results when a series of such vertical and horizontal diaphragms are properly tied together to form a structural unit.

These construction systems can be used when designing a building for lateral loads such as those generated by wind or earthquakes. Designers must be careful to avoid making the c g adjustments again. Curved diaphragms idealize it as flat. Because these values are plywood specific the appropriate panel grade and construction adjustment factors c g have already been applied.

This program calculates nailing requirements and shear values using icbo report 1952 for diaphragm design using 23 32 plywood applied according to the report s requirements. Design strength and stiffness. The term diaphragm is usually applied to roofs and floors. A diaphragm is a flat structural unit acting like a deep thin beam.

New approaches to very large flexible diaphragm by john lawson high load diaphragm design example design criteria 192 x 120 tilt up building panelizedroofsystempanelized roof system 8 30 ft high wall with 4 ft parapet checkforseismicloadonlycheck for seismic load only. Idealize sloped wood roof diaphragms as if they are flat. High load plywood diaphragm this program provides analysis and design of horizontal rectangular plywood diaphragms subjected lateral loads from wind or seismic forces. A diaphragm is a flat structural unit acting like a deep thin beam.

In plywood diaphragms the plywood sheathing is the web of the beam and the edge framing chords are the flanges of the beam. Whilst the information in this guide was accurate at the time of publication it is the users responsibility to. Diaphragm deflection thinking outside the box. A shear wall however is a vertical cantilevered diaphragm.

The use of plywood as a shear resistant material is not new since the behavior of plywood sheathing used as roof and floor diaphragms has been well established by previous testing and extensive. Even greater withdrawal strength but should be sized by the building designer.