Reinforcing Details
- Steel placement.
- Standard lintel block.
- Standard bond beam.
- Spacing of horizontal steel.
- Standard lintel block.
- Minimum reinforcement:
- UBC doesn't specify a minimum amount of steel, (or r), for flexural beams.
- Good engineering practice, however, recommends a minimum:
r ³ 80 / fy- In example: Grade 60 Þ rmin = 80 / 60,000 = .0013
- Maximum size of Rebar
- Limit rebar size to No. 11 or less.
- Anchoring reinforcing steel.
- To properly develop and maintain the "composite action" of the masonry reinforcement, need to "anchor" the reinforcement (ensure that it "holds" its force).
- The composite action is a function of bond strength developed by:
- chemical adhesion of cement to rebar, and
- mechanical interlock of the rebar.
- In design, we maintain the composite action by ensuring adequate embedment of the bars and by checking bond stress.
- Embedment (anchorage) can be obtained by a combination of development length, ld, mechanical device,
or hook.
- Hooks can be used in tension only.
- ld=.002 db Fs; for deformed tension bars.
- ld=.0015 db Fs; for deformed compression bars.
- Reinforcing bond stress, m:
