From time to time people ask “What does a properly installed seismic brace look like?”
Our California representative, Mason West, has just completed supplying and supervising the installation of the seismic restraint and isolation systems at the new 760,000 sq. ft. Palomar Medical Center and we finally remembered to take some photos. We thought this picture and explanation of a perfectly installed clevis bracing system would be helpful.
Since the cable brace is in tension only, we designed the SCBH with a hooked end for quick installation at the clevis. This hinged assembly provides for a straight pull on the cable and makes it easier to install the brace at the proper angle of 30 through 60 degrees. The brace shown is ideal at 45°. Only one tool is required to tighten the bolt that secures the cable. This is a big help when you are working 20 feet off the ground!
The SCB is similar to the SCBH, but has a hole in place of the hook to slip over the stud anchor at the ceiling.
During an earthquake, support rods are subject to upward movement which may cause buckling. The rod is strengthened by the attachment of a Strut with the UCC clamp.
The CCB is the final piece of the restraint system. This simple device prevents deformation of the clevis.
All Mason seismic hardware used in earthquake zones is preapproved by the state of California (OSHPD) with selection by our professional engineering department. Of course our representative is there to assist the contractor from design to installation. Our material has endured numerous large quakes over the years without a single failure.
Please call us on your next seismic project.