The process by which Thybar roof curbs and seismic/wind load restraints are designed can be summarized in three steps.
- Determine the governing building code for the particular project.
- Calculate the seismic/wind load design force that the rooftop equipment and roof curb is required to withstand.
- Determine the requirement for attachment of rooftop equipment to roof curb and roof curb to building structure.
CLICK HERE for a questionnaire that can be used to gather the information necessary for Thybar's licensed Professional Engineer (P.E.) to certify that the roof curbs and restraints meet the requirements of the applicable building code.
Shaker Table Testing
A seismic qualification test series was performed by The
University at Buffalo's (UB) Structural Engineering and Earthquake
Simulation Laboratory (SEESL) for Thybar Corporation (Thybar). The Units
Under Test (UUTs) consisted of four rooftop units mounted on four Thybar
roof curbs. All four UUTs were mounted to a shake table and tested
simultaneously. The main objective of the tests was to qualify for seismic
performance under the 2006 International Building Code per ICC ES AC156
(2007) test protocol.
Based on the
observed results of the tests reported herein, all four UUTs passed the
seismic qualification requirements for a nonstructural component with an
Importance Factor IP
= 1.5 to a maximum spectral acceleration of 3.20g per Section 6.7.2 of ICC
ES AC156 (2007).
