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  • Users: casasf
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  1. casasf

    impact load

    I am working on a foundation design for an evaporator. The compressor VERTICAL loading at the supports are +/- 74 kips. The duration of the load is 10 ms. What is the recommended load combination we can use? any references? Appreciate your response.
  2. casasf

    cold formed steel compression limit

    hello, what is the compression limit ratio for conduit pipes Kl/r? is it 200 like steel or more? if it is different can you provide the reference? Thank you in advance.
  3. casasf

    F.S. for Overturning and sliding

    Can someone refer to the code section for using the factor of safety against overturning and sliding for a footing carrying a simpson wood strong wall? I found the 1.5 factor for retaining walls but could not locate for shallow foundation. I can use 1.5 for both. 40 years ago there used to be a...
  4. casasf

    stainless steel bolts 188 grade

    I am looking for a table that shows the grade of stainless steel bolts or studs in grade 188 giving the tensile and shear capacity for 3/8" diameter. Can some one provide me with a reference? also, I am trying to locate the equation for "thread stripping area" ( I have not seen this title...
  5. casasf

    ASCE 7-10 section 4.5.3 Vehicle Barrier

    Is the 6000 pounds listed in the section strength level or service load? Since this is an impact load, is there an increase in the stress allowable?
  6. casasf

    retaining wall

    Can you provide some design aid references for: 1. Stacked Boulder retaining wall mortared, and 2. Railroad tie stacked retaining walls If you have any reference guides for design please forward names and links. Thank you in advance.
  7. casasf

    NDS 2005 shear values

    When designing wood shear walls, I usually take the base shear per wall and multiply by 0.7 or divide by 1.4 to get ASD. Using Table 4.3A wood-frame shear walls in the 2005 NDS (I don't have the 2012 yet, its on its way), footnote 1 refers to section 4.3.3 to determine ASD allowable unit shear...
  8. casasf

    wood shear walls using wood siding

    Can someone refer me to the capacity of wood shear walls using wood siding for old residential construction 1960s?
  9. casasf

    aluminum

    I could not find properties for Aluminum 6061 t5/t7. Is there such a thing? the only property I saw was 6061 T6. Is t5/t7 old designation?Thanks in advance.
  10. casasf

    Reduced Beam section Special moment steel frames

    In the protected zone of an RBS special moment connection, we are not allowed to attach to the flanges. What about the web? Can we attach to the web within the protected zone w/bolted steel angles to pick up a framing members? I checked with FEMA books and AISC seismic manual, there was no...
  11. casasf

    water tanks

    I am looking for a design aid for figuring the forces in a seismic activity. The tank is a plastic, 5000 gallon capacity it is 141" in diameter and approximately 90" high. I need to get the forces in a cable that goes to a "dead man". Any suggested references? Thank you in advance.
  12. casasf

    Partial joint penetration

    I am looking for a design of PJP connection. Can someone refer to a good reference? I am interested in HSS to an HSS. Thanks.
  13. casasf

    camber in concrete beams

    Can someone show me where is the camber factor (mild steel and PT) requirements called out in AASHTO LRFD Bridge Design Specifications?
  14. casasf

    ASSHTO Requirements

    Where in the ASHTO LRFD Bridge provides an equation for Longitudinal bars requirement in concrete slabs? similar to Equation 5.10.8-1 page 5-121 "shrinkage and Temperature Reinforcement" Also, the table A4-1 on page 4-98 is it for loading HL-93? what happens for California amendment Design...
  15. casasf

    concrete slab/beams with HS20-44 truck loads

    I have not done this before but I have a condition that I ned to design a concrete slab (multiple spans)that spans between concrete beams spaced at 8.75'the length of the concrete beam is 59 feet. The beam frames into retaining walls One span condition) and continous over two supports. Is there...
  16. casasf

    pedestrian Bridge

    I am designing a pedestrian bridge having a span of 90 feet and the transverse direction is 12.5' Steel tube trusses are being designed. For the floor I have a metal deck with concrete over a horizontal truss, Where the edges are the bottom chords of the vertical trusses, i have diagonals and...
  17. casasf

    pile caps/tie beams

    I am trying to find out the requirement for tie beams between pile caps in IBC 2009. Can someone locate the section reference please? I remember from the old codes there was a 10% design value for the tie beams. Thanks.
  18. casasf

    flexible diaphragm

    I need some interpretation of section 12.3.1.1 Flexible Diaphragm Conditions per ASCE 7-05 page 124, quoting: "...in which the vertical elements are steel or composite steel and concrete braced frames, or concrete, masonry, steel, or composite shear walls." When the section refers to vertical...
  19. casasf

    concentric braces

    I have a design issue and wonder who can assist: I have designed a building with steel concentric ordinary braced frame (diagonal). If I need to move the brace away from the column beam connection, there will be an eccentricity on the connection. How far(maximum distance) can I go before...

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