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  1. DST148

    Live Load Reduction on Discontinuous Column

    @sgs114>>> The reduction factor at a given story would depend on the cumulative influence area at that level. See thread176-405000. It has a solved example from ASCE at the end of the thread. Here are my thoughts on the total live load on the column on the 1st floor from that solved example: I...
  2. DST148

    Snow-shelf structure

    If my memory serves right, per Canadian Code, height of upper parapet does affect leeward drift on the lower roof. @GalileoG>>>> You can avoid leeward drift on the lower roof by building a new screen wall / parapet of sufficient height. However, as BadgerPE posted above, you still need to deal...
  3. DST148

    Truss/Joist End Moments

    The approach you mentioned in your post is called FMC - Flexible Moment Connections or Wind Moment Connections. The basic principles of FMC approach are to treat the beams as simply supported under gravity loading but as moment connected under lateral load. If you have single-bay frame, assume...
  4. DST148

    AISC Design Guide 1

    @btomcik>>> Assuming d is the distance from the centre of anchor rod to edge of base plate, tension "T" in the anchor rod is approx. given by T = M / [(5/6) * d] The term 5/6 is to account for the lever arm between c.g. of tension and compression.
  5. DST148

    Alternatives to Engineering-International for basic structural dsign software/spreadsheets?

    You may buy only those spreadsheets that you use often.... I am not aware of their current sales policy, but this option was available around 2008.....
  6. DST148

    Cantilever RC Beam / Transfer Beam / Offset Column

    @rapt>>> In reference to your post above....I have older version of the code, Section 10.7.1 of ACI 318-05: Deep beams shall be designed either taking into account nonlinear distribution of strain or by Appendix A (STM). Let us know if the code language has changed as you have posted above. I...
  7. DST148

    Cantilever RC Beam / Transfer Beam / Offset Column

    @rapt>>>> I agree with you. However, the OP says it's a cantilever grade beam supporting column above.... I don't see any problem so long as the length of cantilever is at least equal to Ldh for the top reinforcing + 2". Inside diameter of bend for stirrups is 4 x db for #5 and smaller bars...
  8. DST148

    Cantilever RC Beam / Transfer Beam / Offset Column

    @RFreund>>>> From detailing perspective.... It is difficult to develop top tensile and horizontal shear reinforcing in short cantilevers and brackets. You may have to use U-shaped bars to satisfy development lengths..
  9. DST148

    Biaxial Bending in a Glulam Beam

    @medeek(OP) - I don't do wood design that often.... but recently tried to familiarize myself with design of beam columns by solving some of the problems from Structural Wood Design Solved Example Problems, AWC, 2005 Edition. Problem #7 - Glulam Beam subjected to bi-axial bending: No axial load...
  10. DST148

    Basement slab correct water pressure

    @Enhineyero>>> We have a situation something similar to yours. The project is located in a Flood Zone. The lower level parking is about 8 feet below finished grade. The Civil Engineer has given us the Design Flood Elevation which is about 7 feet above lower parking level. The natural water...
  11. DST148

    Seismic Base Shear

    @VTHokie91>> I have older version of IBC Seismic Design Manual. I have attached two relevant pages from the manual. For a single story structure with masonry / precast walls(heavy) and wood / metal roof(light), the assumptions made in calculating the seismic weight of the walls can make a...
  12. DST148

    Radiant pipe heating in structural slab on metal deck

    Thanks structSU10. Detail on Uponor website shows 3/4" thick concrete over tubes. The detail from Watts Radiant cautions about maintaining minimum 2" concrete thickness above tubing. We have suggested detail per attached sketch: the WWM supported on deck and tubing secured to WWM. We have...
  13. DST148

    Radiant pipe heating in structural slab on metal deck

    thread507-315447 We have 3 1/2" LWC on 3" composite metal deck (total 6 1/2" thick), spans 11'-0" , total load 110 psf. The owner wants to install 1/2" plastic pipes at 9" o.c. in the structural slab. The pipes run parallel and perp. to deck in a serpentine fashion. ACI 302 - Guide for...
  14. DST148

    Townhouse Wind Loading - parallel to front wall

    @NateB>>> See if post by Steve1415 at the very end of the thread507-309907 would help.
  15. DST148

    Snow Load Calculator

    @medeek>>> Thanks for posting.
  16. DST148

    Embedded H-Piles in Concrete Pile Cap

    @tcotter>> Per thread507-213359, and post by lkjh345, CRSI Handbook recommends that with 6" pile embedment, cover plates for bearing are not required.
  17. DST148

    Embedded H-Piles in Concrete Pile Cap

    tcotter>> You might have already referred to thread507-14634. The posts by dlew and austin do make a reference to research by State of Ohio Dept of Highways and dated 1947. I have not seen that report. On many of our projects, we have used 100 Ton H piles, 6" embedment into pile cap and without...
  18. DST148

    Lateral Soil Load IBC Tabole 1610.1 Values

    I don't have soils book at home, but I have old CERM.... Coeff of active earth pressure Ka and passive earth pressure Kp in the most general form depend on four parameters: angle of internal friction, angle of external friction, slope of backfill, and rake angle of retaining wall face. Active...
  19. DST148

    Lateral Soil Load IBC Tabole 1610.1 Values

    For simplification, let us assume back fill is horizontal, wall face is vertical, and wall friction is zero and the soils can be broadly classified as granular and non-granular or clayey..... For clayey soils, the angle of internal friction phi is close to zero. The active earth pressure is...
  20. DST148

    shim plates under structures

    std88>> If the intent of your OP is metal compatatibility to resist corrosion then..... Ref: AISC Steel Const. Manual 13th Ed., Table 2-6 : If base metal is galvanized steel and fastener metal is steel or cast iron, then the corrosion of the galvanized base metal is marginally increased by the...

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