The Tilt-Up Concrete Association (TCA) has announced the formation of a seismic design task group. According to Jim Baty, technical director of the TCA, the task group was formed as a proactive measure to involve the experts in the tilt-up industry.

Responding to concerns about the performance of tilt-up structures during earthquakes in high seismic regions—largely due to incomplete information on both design and performance characteristics—this group is charged with identifying the state-of-the-art tilt-up design procedures and standards for seismic performance and developing modifications to the current building code provisions based on these procedures and standards. The task, initiated during the TCA Convention last October, has begun to develop models for current design practice as well as solutions for dynamic modeling through the National Earthquake Hazard Reduction Program (NEHRP) and proposed detailing through the American Concrete Institute (ACI). The task group is headed by John Lawson, Joe Steinbicker, Jim Baty, Ed Alsamsam, and Phil Kopf with consulting input by S.K. Ghosh, Bob Bachman, and Neil Hawkins.

The task group will concentrate on the following issues: seismic loads applied to panels, connection details, panel design, adjustments to the current concrete code, classification of flexible diaphragms, and recognition of the increasing number of tilt-up buildings that reduce the flexible diaphragm characteristic by bracing the frame due to complex façade perimeters.

For more information on the committee, contact Jim Baty at 319-895-6911 or