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  1. RRPC

    Reinforce Existing Wood Retaining Wall

    i have a very similar situation with a client. An unstable 6x6 timber wall, 6 feet tall, sloping backfill at 25% grade, built without a permit. 'Chance anchors' are soil nails which is mechanically stabilized earth (MSE) system. Embedment depth about 8' and spacing 2 rows at 4 feet, $300 - $500...
  2. RRPC

    Curved Stair Stringers

    Thanks for the comments. I should give you more information. The spans are 13' or less, the curve only goes through a 90 degree arc and there is an intermediate support under the curved section. So the torsion is indeed minimal, but still too much for an MC12 methinks (torsional constant =...
  3. RRPC

    Curved Stair Stringers

    Roger that! No bouncing allowed! I imported an ACAD model. I'll let you know what I come up with.
  4. RRPC

    Curved Stair Stringers

    HSS 4x12 seems a little heavy based on my hand calcs. I think I'm going for a 3/16" cover plate on an MC12x10.6. I downloaded the RISA3D demo and am working on the model. Thanks for your comments.
  5. RRPC

    Curved Stair Stringers

    Hello, thank you for sharing your knowledge and experience! I'm looking at stair stringer design for a curved stair, centerline radius 14'. Q1 - What are the design parameters, allowable bending, slenderness ratios, torsional properties, for a using a plate stringer rather than an MC12. (I...
  6. RRPC

    wood allowable bending stress

    thank you haynewp. And that discussion was not so long ago either! I'll look a little harder next time.
  7. RRPC

    wood allowable bending stress

    Any good references for or experience with allowable stress in 150 years old wood joists? 3x11, clear, haven't determined the species yet. The calculated bending stress under load is 2450 psi. I have the NDS tables from 1991 and WCLIB grading rules from 1991, also Wood Engineering and...
  8. RRPC

    Make an Existing non-composite beam act composite?

    In older structures I have sometimes considered concrete encasement for fireproofing to act compositely if it meets the requirements. Check slab thickness / steel coverage, concrete reinforcing or mesh. Don't forget that the composite section resists only the live load so sometimes its hard to...

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