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Spring supports concrete anchors

Spring supports concrete anchors

Spring supports concrete anchors

(OP)
Hello,

I am designing a steel beam over an existing concrete-slab-on grade. The steel beam is intended to distribute the loads to the slab to avoid foundations and it is anchored with concrete anchors to the slab-on-grade. The loads imposed to the steel beam are of seismic nature and the main concern is uplift. The question I have is how to model the anchors as supports for the beam to ensure that the loads get distributed based on the stiffness of the steel beam. I understand that the beam is very rigid when compared to the concrete slab and am contemplating using springs for these anchors but don’t really know what to assume for the stiffness of the spring. I modeled the spring supports for the anchors by using AE/L where L is 2-3 inches. Does anyone have experience with modeling anchors in concrete? I drew a sketch with the elevation of my assembly.

thanks!

RE: Spring supports concrete anchors

The anchors nearest to the uplift force will resist the most load. Similarly, the anchors furthest from the uplift force will resist the least amount of load. I would linearly distribute the load to the anchors from the end of the beam (highest load) to the middle of the beam (assume anchor at midspan of beam resists zero load). That will give you the load per anchor and then you can use the online software from various anchor vendors to check the anchors. I happen to use Hilti Profis.

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