There was a discussion in Eng-Tips recently about supporting a 30’ height of unbalanced earth pressure for a proposed building to be built into a hillside. A couple responders mentioned the use of tieback anchors to keep the unbalanced earth pressure from loading the building frame. I mentioned that it is preferred to not have a rigid connection between the building and the anchored wall. This Eng-Tips (ET) thread has found its way to SimpliEngineering (SE). The following may be of interest to anyone following this topic in ET or SE.
Experience has shown that having a rigid connection can cause damage to the building and/or wall because the building and wall will have differing reactions and movements from the unbalanced earth load. As a reference, I post the attached PDF of an excerpt from a 1984 meeting reprint written by Schnabel Foundation Company, now renamed as Schnabel Geostructural Design & Construction. It briefly describes the problem of rigidly attaching a building to an anchored retaining wall. This is an old document but it is still applicable today. Schnabel has had concern for this problem from the late 1970’s and I have had to consider this problem in several of my wall designs since then.
Tiedback Building Wall.pdf (145.1 KB)