Axial tension @ base of unreinforced masonry retaining wall

[Temporaryworks]

Hi,

Australian masonry code AS3700 provides a design value for flexural tension in masonry (limited by mortar tensile capacity). Could this extend to the tension between the base of the wall and a concrete footing - see attached sketch for details. In this case, the basement wall acts as a retaining wall and its self-weight is not enough to maintain stability. There is a timber floor at the ground level but there doesn't appear to be any positive connection between the floor and the wall and I was wondering if the mortar at the base may be helping to prevent overturning by mobilizing some of the concrete footing self-weight.

Thanks,
Temporaryworks

 

[KootK]

I mostly agree with your logic on this but, at the same time, I'm not sure that I'd be willing to make that leap myself. Among other potential issues, masonry shrinkage & expansion at the interface against hardened concrete might compromise the bond. FYI: your sketch didn't come through.