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  1. Beanbag1

    Location of Critical Perimeter (per ACI) for Concrete Pile Cap (single square cap for one pile)

    Introduction: For punching (2-way) shear check, the ACI says to assume the critical perimeter location along a line located d/2 from face of pile. However, ACI 318-19 Sect. 22.6.4.3 also says that if an opening (or presumably an edge?) is located closer than 4h from the face of the column (in my...
  2. Beanbag1

    Design Thickness for Two-Way (punching) Shear Resistance in Stacked Concrete Slabs

    Designing a pile cap for an elevated marine wharf platform, as follows....Phase 1: Install bearing piles at 15-ft x 15-ft grid pattern, with tops extending above high tide; Phase 2: Place 3-ft thick precast reinforced concrete pile caps atop the piles; Phase 3: Place 2-ft thick precast...
  3. Beanbag1

    What' is lateral force on tall, narrow water containment (say 5' wi x 50' hi x infinite length)?

    Hi everyone. I am calculating wall pressure of 3120 psf at bottom of tank, with the resultant force = 78 kips per ft of wall, but the wt of the water in the containment structure is only 16 kips per ft of wall. In designing the concrete walls, can I use lateral force of 16 kips or do I need to...
  4. Beanbag1

    Unbraced Length (k) Factor? [for Pile that Supports a Multi Span Bridge Bent with Expan Jt]

    Hello, The following scenario and question is for structural engineers who design bridges: Designing a multi span bridge over a creek, say 12 spans each 40-ft for total 480-ft. Each span substructure is comprised of concrete cap supported on pipe piles. The cap and top of piles is approximately...
  5. Beanbag1

    IBC Building Code - PDA CAPWAP for Driven Piles

    Does anyone know where (in the ICC IBC building code) I might find geotechnical resistance factors for LRFD design (or F.S. for ASD design) of driven H-piles for buildings? I am trying to determine factors of safety for driven piles that are tested and validated via PDA and CAPWAP for...
  6. Beanbag1

    Minimum Earth Cover Above Grouted Tie Back for New Retaining Wall

    Hello, I am designing a new steel sheet pile (SSP) retaining wall with grouted tie-backs. I plan to design the SSP as a cantilevered wall up to a certain height, backfill up to that height, install tie-backs 3-feet below that certain height, test the tie-backs, and then finish the backfilling...
  7. Beanbag1

    How to Evaluate an Existing Open-End Pipe-Pile via FHWA Nordlund Method?

    Greetings fellow engineers, I am in need of simplified advice in regards to estimating (via hand calculation) the side resistance strength of an existing drive 14-inch OD Open-End pipe pile in sand, using the FHWA Nordlund method. Let's assume this to be a non-displacement pile and it's...
  8. Beanbag1

    What is Pile Tip Area for Calculating Point Bearng Capacity for H-Piles in Sand?

    Greetings. Is anyone familiar with the FHWA (Nordlund) empirical method for designing H-piles in sand? I see that the "box" area (4-sided perimeter area) is to be used for calculating side friction resistance. But I am unclear as to which area to use for calculating the toe bearing...
  9. Beanbag1

    How to Determine Critical Depth for Design of Pile Thru Mixed Soil Strata?

    Greetings, fellow Eng-Tippers. Numerous authors suggest assume 10D for loose soils, 15D for medium soils, and 20D for stiff soils, for critical depth. I am analyzing an existing 60-ft long pile that was driven thru sand, and am trying to determine the SKIN FRICTION capacity using empirical...
  10. Beanbag1

    Fabricated structural steel inspection required?

    We just received a few tons of fabricated structural steel for the erection of a pipe rack at our chemical manufacturing plant in Texas. The fabricator is an AISC certified shop. Am I required by law to have this steel inspected by a qualified third party in order to erect it?
  11. Beanbag1

    How to specify length and width of corrugate steel floor decking?

    Can someone provide guidance on how to specify the length and width of each floor deck panel for a known plan dimension? What is the minimum overlap (in the length direction) and minimum sidelap (in the width direction) requirement? And how is this accounted for when preparing the bill of...
  12. Beanbag1

    CMU Wall Construction - How Many Courses High Between Mortar Cures?

    I am putting together a set of construction specs for a new 15-foot high building with 8-inch CMU exterior load bearing walls, with vertical reinforcing every 32-inches C/C, and I would like to know how many courses high can the blocks be laid before the contractor has to stop and wait for the...
  13. Beanbag1

    Structural Engineering Books for US Gulf Petrochem Facilities?

    a. Are there any good practical books on the design of steel and concrete structures for petrochemical facilities, particularly relevant to the US Gulf Coast area? b. Is there such a book that references the latest ASCE 7-10 wind provisions? c. Are there any such books published by working...

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