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  • Users: EngrRC
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  1. EngrRC

    Concrete cover for piled rafts

    CRSI Design Guide for Pile Caps shows a minimum embedment of pile into the pile cap by 4 inches, and then the bottom reinforcements are to have 75mm concrete cover above pile head. Is this valid for concrete piles or is this just for steel piles? I do not see the need to have 75mm extra cover...
  2. EngrRC

    Seismic design base shear to ASCE7-16

    I am designing a tall building to ASCE7-16. I have designed the superstructure using response spectrum demands (scaled to match the equivalent static force base shear). However, I am designing the foundation based on overturning moments from Equivalent Static as mandated by the approving...
  3. EngrRC

    Shear wall lateral system - what is the minimum percentage

    I am designing a building with lateral resisting system composed of shear walls to ASCE 7-16. Vertical resisting system uses frames and shear walls. Some earthquake base shear is taken by the columns - is there a limit (minimum %) for which the "shear wall system" no longer becomes applicable...
  4. EngrRC

    Encased composite column shear stud design to bending

    For a multi-level encased composite column, how do you design the shear studs for the shear/bending within every floor level? AISC offers three methods (external force applied to steel / to concrete / concurrently) - which of these is applicable for that mentioned above?
  5. EngrRC

    Composite Column Shear Studs

    Does anyone have a reference that explains in detail how the shear studs of a composite column are designed and where they need to be provided? In particular, I have this confusion: For a multi-level composite column subject to compression load only (for simplicity), do the shear studs have to...
  6. EngrRC

    Circular Hollow Section - Maximum Thickness

    What is the maximum thickness that is possible (in terms of fabrication) for a circular hollow section? I have cases wherein I need an 800mm circular section with 80mm thickness.
  7. EngrRC

    Wind drift - Can drift due to gravity loads be subtracted?

    In ASCE7, wind drift is evaluated using load combination of 1.0 dead + 0.5 live + Service wind. If I run two nonlinear cases (A) 1.0 Dead + 0.5 Live + service wind, and (B) 1.0 Dead [w/o Facade loads], can I evaluate the drift as A-B? My thinking is that wind drift is concerned with...
  8. EngrRC

    Reduction of foundation overturning (ASCE 7-16 Cl. 12.13.4)

    Has anyone used this provision for piled raft design? I intend to use this to reduce the pile loads coming from earthquake. I've seen some people say that this is only for overturning/soil stability, but from the commentary, my interpretation that this 25% reduction in overturning moment can be...
  9. EngrRC

    Overstrength factor for wall supporting planted column

    I am designing a concrete wall which carries a transfer beam supporting a planted/floating column. ASCE7 mentions the wall should be designed for seismic load with overstrength factor. Now, my question is does all the seismic load resisted by the wall (coming all the way up from uppermost...
  10. EngrRC

    Rebar Anchorage

    Does ACI or any other code allow this type of anchorage?
  11. EngrRC

    Global Buckling Load Factor for Truss

    I am doing global buckling analysis of a truss. What is the recommended buckling load factor (ratio of buckling load to applied load) that you use in your design office?
  12. EngrRC

    Multi-layer topping over structural slab subject to Heavy Traffic

    Has anyone designed a multi-layer topping over structural slab subject to fire truck load? It consists of layers of pavers, screed, styropor, drainage layer, screed, void former again etc. The idea is to check whether the specified layering will be adequate in terms of bearing capacity...
  13. EngrRC

    Shear studs for diaphragm forces

    Does anyone have a reference for designing shear studs in composite metal decking for diaphragm forces? I have tried multiple sources but I could only find guidance on designing shear studs for gravity load.
  14. EngrRC

    HSS to HSS sleeve connection

    Does anyone know of any guidance relating to moment connection between two hollow steel section beams, one beam (smaller tube) snug fit inside the other (bigger tube) by some contact length? I imagine that bolts, when used to connect the two, would only resist axial loads to prevent them from...
  15. EngrRC

    What steel design check to perform

    What design check should I perform for a HSS member due to a through bolt in tension? What comes to mind is web yielding. Anyone knows how to perform such check? This is actually an aluminium section, but steel checks are welcome...
  16. EngrRC

    HSS Connection

    Can the attached HSS connection detail resist torsion, without providing major moment restraint?https://files.engineering.com/getfile.aspx?folder=d85fb8cd-5a95-4a67-ac34-ebdc17e3b751&file=hss_connection.PNG
  17. EngrRC

    Combined stress for fillet weld

    Hi all, I am referring to the combined stress equation for fillet welds as per BS5950 which reads: (F_L/P_L)^2+(F_T+P_T)^2 < 1 where F_L/P_L = utilization in the longitudinal direction and F_T/P_T = utilization in the transverse direction Shouldn't there be a square root in the formula?
  18. EngrRC

    Concrete Removal and Repair

    So, I have a manhole opening on a 350mm slab. The manhole cover would supposedly bear on a 50mmx50mm recess on the 350mm slab. Now, the manhole cover apparently needs to sit on a 90mmx90mm recess so part of the slab surface needs to be hacked. My question is, how do I repair the concrete slab so...
  19. EngrRC

    Helical Steel Stairs

    Has anyone designed a helical steel stairs? Attached is a 3d model i am working on. It has a 7.3m horizontal span and 4.5m floor to floor height. There is an intermediate landing. The top and bottom connection points are somewhat aligned so you get like a 2D-truss. Any tips for what kind of...

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