May 15, 2012

RISA’s Automated Lateral Load Generation: What’s New in the 2010 ASCE-7 Code

ASCE has published a new edition of ASCE 7: Minimum Design Loads for Buildings and Other Structures. RISA-3D has the capability to automatically generate seismic loads and wind loads per ASCE 7 as well as a variety of international codes. The latest addition to RISA’s capabilities is the 2010 edition of this manual. Below are the major changes from the 2005 edition.

For wind loads the Occupancy Category is no longer an input option. ASCE now publishes different wind speeds depending on the newly renamed Risk Category of the structure, which incorporate the Importance Factor previously used.

For seismic loads the Occupancy Category has been renamed to Risk Category, although the category options remain the same. Also, for structures which fall under Seismic Design Category A the program no longer generates seismic loads. Per new code provisions, such structures no longer need to be designed for seismic forces.

The new code requires notional loads to be applied to all structures as a minimum lateral force. The Notional Load Generator has been improved to include the default value (1% of g) as the notional load in each direction. This can be accessed through the Insert Menu, under Notional Loads.

The latest ASD and Strength level load combinations are now incorporated into the Load Combination Generator.

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