5.5 Unreinforced Masonry Infill Walls in Frames
The height/thickness ratio of the wall panels is as follows:
- One-story building hw / t < 14
- Top story hw / t < 9
- Other stories hw / t < 20
The deficiency is in the out-of-plane strength of the wall. Check the out-of-plane demand using the procedure for parts and portions of a building given in Section 2.4.6.
The infill walls are continuous to the soffits of the frame beams.
For conforming buildings, the evaluator may consider this condition as mitigated, and no calculations are necessary. The deficiency is in the strength of the columns. Check the shear capacity of the columns to develop opposing yield moments at top and bottom of the short free height or to resist required force amplified by the factor Cd/2, but not less than 1.5.
All infill panels are constructed to encompass the frames around their entire perimeter.
For conforming buildings, the evaluator may consider this condition as mitigated, and no calculations are necessary. The deficiency is in the connection of the infill panel to the frame. Determine the panel edge condition from available drawings or from field investigation. If the panels are not properly connected to the frame, report this condition as a deficiency.