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  1. StructuralAddict

    ASCE 7-16 Anchorage of Structural Walls

    Clause 1.4.4 of ASCE 7-16 states that "The connections must be capable of resisting a horizontal force at the strength level, perpendicular to the plane of the wall, equal to 0.2 times the weight of the wall tributary to the connection, but not less than 5 psf". I would appreciate some...
  2. StructuralAddict

    Slip Critical Connection

    Hi, The bolt slip resistance in slip-critical connections is Rn/Ω = [μ Du hf Tb ns /Ω] per Eq. J3-4 of AISC 360-16. For the splice shown below: (1) What should I use for (hf)? Is there one filler between the connected parts (hf = 1.0)? Or are there two fillers between the connected parts (hf =...
  3. StructuralAddict

    Slip Critical Connection

    Hi, The bolt slip resistance in slip-critical connections is Rn/Ω = [μ Du hf Tb ns /Ω] per Eq. J3-4 of AISC 360-16. For the splice shown below: (1) What should I use for (hf)? Is there one filler between the connected parts (hf = 1.0)? Or are there two fillers between the connected parts (hf...
  4. StructuralAddict

    Smooth vs Deformed Wires

    Section 20.2.1.1 of ACI 318-14 states that "Nonprestressed bars and wires shall be deformed, except plain bars or wires are permitted for use in spirals." However, I saw in many projects that they use welded wire mesh with smooth wires in concrete toppings and composite metal decks. Is the use...
  5. StructuralAddict

    Slab-on-Ground

    Section 1.4.7 of ACI 318-14 states the following "This Code does not apply to design and construction of slabs-on-ground, unless the slab transmits vertical loads or lateral forces from other portions of the structure to the soil." Could someone please explain to me what is meant by vertical...
  6. StructuralAddict

    Flange Splice per AREMA

    In AREMA, there is this requirement about splicing the flange of a flexural member "No two elements in the same flange shall be spliced at the same cross section". So, for a bolted built-up girder whose flange consists of 3 cover plates: my question is what is meant by element? Like are all 3...
  7. StructuralAddict

    Response Spectrum Scale Factor

    How do we define the "Scale Factor" in the Response Spectrum Case? I looked into the ETABS documentary and I found two different answers (one is saying to use gravitational acceleration (g) as the scale factor; and the other one is saying to use (I.g/R) and then adjust it based on the static...
  8. StructuralAddict

    Sorting Load Combinations

    Hi, Is there a way in SAP2000 to sort the load combinations? The load combinations are always sorted by the time I added them. However, I want to sort them alphabetically based on the combo name I provided. I'm using SAP2000 v.23.3.1. Thanks.
  9. StructuralAddict

    Structural Walls Design

    In ACI 318-14, the commentary to Section 11.3.1.1 states the following: "The minimum thickness requirements need not be applied to bearing walls and exterior basement and foundation walls designed by 11.5.2 or analyzed by 11.8." So, does this mean that the minimum wall thickness requirement is...
  10. StructuralAddict

    Yield Moment (My)

    In built-up plate girders, if the web is of grade 36 ksi and the flanges are of grade 50 ksi, then what how would the yield moment (My) be calculated? Is it My = (36ksi)x(Section Modulu to bottom of flange) or is it My = (50ksi)x(Section Modulus to top of flange)?
  11. StructuralAddict

    Maximum Bearing Length

    Hi, Is there a limit on the maximum bearing length (lb) for a steel beam on concrete or masonry support? I don't feel that we can have a very long bearing length and say that the stress is uniformly distributed over the entire bearing area. So, there must be something in the code to address this...
  12. StructuralAddict

    Prying Action

    Hi, Could someone please explain to me what's the difference between tnp, tmin and tc related to Prying Action in PArt 9 of AISC Steel Construction Manual (15th Edition). I know that tnp is the thickness that will prevent prying action effects from happening; however, what about tmin and tc...
  13. StructuralAddict

    IBC 2018 Deflection Limits

    In Table 1604.3 of IBC 2018: 1. The deflection limit on the wind load, I assume that it means [vertical deflection in roof members] and [horizontal deflection in exterior walls]. Is my understanding correct? 2. Regarding footnote (d), could someone explain what it means? It's not clear to me...
  14. StructuralAddict

    Load Combination Considering Crane Load

    How do we account for crane load in load combinations? The crane load consists of both dead load and live load (both increased by a certain percentage as shown in Sections 4.9.3 through 4.9.5 of ASCE 7-16 to account for vertical impact force, lateral force, and longitudinal force, respectively).
  15. StructuralAddict

    Frost Depth

    The following is from 2014 New York City Building Code. Does this requirement apply to interior footings in the building? Or just for footings adjacent exposed grade? "1805.3.1 Frost protection. Except where otherwise protected from frost, shallow foundations, pile caps, and other permanent...
  16. StructuralAddict

    Live Load Reduction

    Hello, I have a question related to the calculation of the live load reduction factor (ASCE 7 Procedure). L = (Lo){0.25+15/sqrt[(KLL)(AT)]} With reference to the attached frame: (1) What (KLL) and (AT) should we consider to calculate the reduced live load of Beam B1? And how many floors is...
  17. StructuralAddict

    2-Way Flat Plate Based on ACI Direct Design Method

    Hi All, With reference to the attached floor plan, I GREATLY APPRECIATE it if someone will be so kind to divide the flat plate into "Column Strips" in both E-W and N-S directions based on ACI 318-14 Direct Design Method. The following are not clear to me when creating the "Column Strips": 1-...
  18. StructuralAddict

    Wind Load on Inclined Member

    Hi, I have a quick question about the attached frame. The wind load is given as shown in the figure. I want to calculate the reactions at the pinned and roller supports. What is the length that the wind load is applied at? Is it 15 ft or 9 ft? So, to get the resultant wind force, should I...
  19. StructuralAddict

    Shear Span

    I appreciate if someone can give me an answer to this: What is the shear span (M/V) of the following members? 1- uniformly loaded simply supported beam 2- cantilever with concentrated load at its tip 3- two-span continuous beam with uniformly distributed load on both spans Thank you!
  20. StructuralAddict

    HL-93 Truck Tire Loading

    Hi, Just a quick question: are the loads in AASHTO HL-93 Truck Loading factored? or do we need to factor them? AASHTO HL-93 Truck Loading: P1 = 8 kips @ x = 0 P2 = 32 kips @ x = 14 ft P3 = 32 kips @ x = 28 ft (min) Thanks!

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