Seismic Force-Resisting System of Concrete Tilt up Panels
Seismic Force-Resisting System of Concrete Tilt up Panels
(OP)
We are currently having a debate in our office regarding the applicability of using R=3 "Steel systems not specifically detailed for Seismic Resistance" for a concrete tilt up building we are doing in a seismic design category C site. The tilt up panels will be designed by others but we are the engineers of record and will be responsible for the design of the interior steel and diaphragm. The diaphragm will be metal deck on bar joist. The panels will be load bearing and will make up the vertical portion of our seismic force resisting system. Just wondering what the consensus is out there and if this is something that is being done in practice. We have only done a few tilt up buildings before and are relatively new to this type of construction. I feel that the fact this system is specifically called a Steel system excludes us because the bearing walls make up a portion of it.






RE: Seismic Force-Resisting System of Concrete Tilt up Panels
Bearing Wall System
Intermediate Precast Shear Wall or Ordinary Reinforced Concrete Shear Wall - Both of these have an R of 4.
You could use the R = 3, but the walls will still have to conform to the detailing requirements of one of the above systems.
You mention that the project is tilt-up. Are the walls site cast or factory cast? True tilt-up involves site cast panels, that are lifted into place. I frequently run into people that call factory cast panels as tilt-up.
RE: Seismic Force-Resisting System of Concrete Tilt up Panels
RE: Seismic Force-Resisting System of Concrete Tilt up Panels
RE: Seismic Force-Resisting System of Concrete Tilt up Panels
The book is fairly comprehensive and is written for designers.
RE: Seismic Force-Resisting System of Concrete Tilt up Panels
ASCE 7 defines a building frame system this way: "A structural system with an essentially complete space frame providing support for vertical loads. Seismic force resistance is provided shear walls or braced frames."
RE: Seismic Force-Resisting System of Concrete Tilt up Panels
RE: Seismic Force-Resisting System of Concrete Tilt up Panels