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A Parametric Study of the New Diaphragm Design Force Methods
Duration: 55 minutes
Speaker: John W Lawson
Since its introduction into U.S. building codes and standards, a single generally-accepted method has existed for determining seismic design forces on roof diaphragms. Recently, an alternate procedure was introduced in ASCE 7-16, and then an additional alternate procedure was introduced in ASCE 7-22 for single-story tilt-up and masonry buildings. Suddenly the determination of these diaphragm forces has become much more complex. The two newer methods are based on better research; however, it is of general interest to the engineer and their client to evaluate which method might be most cost efficient to select. This presentation provides a brief background of these three diaphragm design force methods and evaluates them side-by-side for a typical large single story tilt-up building. It is revealed that the choice of the most cost-efficient method is not necessarily straight-forward, and is instead dependent upon the building size, shape, response modification factor R, and the building site's seismicity. Armed with this knowledge, the design engineer can evaluate the balance of cost efficiency and modeling appropriateness when selecting a diaphragm seismic design force method on a particular project.
Continuing Education
Credits: 1 PDH/LU
Provider: Tilt-Up Concrete Association
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About the Tilt-Up Concrete Association
Founded in 1986, the Tilt-Up Concrete Association (TCA) strives to improve the quality and acceptance of site-cast Tilt-Up construction - one of the fastest growing industries in the United States, combining the advantages of reasonable cost with low maintenance, durability, speed of construction and minimal capital investment. Over 10,000 buildings, enclosing more than 650 million square feet, are constructed each year using this construction method.
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