Design Aides for Concrete Masonry Members Under Out-of-Plane Loads
presentationposted on 21.07.2014, 00:00 by Angela Jones
In the structural design of concrete masonry buildings, out-of-plane loads are of significant importance. Allowable Stress Design (ASD) and Strength Design (SD) are the two methods described by masonry codes to adequately design for out-of-plane loads. Within these two methods of analysis, there are instances that require more complicated computations. Several typical masonry wall building set ups were evaluated using ASD and SD column and T-beam design methods for single wythe 6", 8", 10", and 12" masonry block walls. These walls were evaluated with steel spacing at 24"and 48" with #4, #5, and #6 rebar sizes. Partially grouted masonry walls were evaluated using ASD and SD column, T-beam, and I-beam design methods for single wythe 6", 8", 10", and 12" masonry block walls. The partially grouted walls were evaluated using the same spacing and rebar sizes as those used for solid grouted examples. In some partially grouted masonry walls, the stress block becomes larger than half of the masonry block. T-beam and I-beam analyses were used to evaluate these specific instances. Solid grouted out-of-plane evaluation methods were compared to partially grouted out-of-plane evaluation methods to determine whether more than a ten percent difference was present.