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  1. CTW

    Floor Plate with Wheel Load - Sanity Check

    I've used Roark's in the past for floor plates with relatively short spans and felt comfortable with the outcome. However, I could use a sanity check for the floor plate outlined below. The plate is 20 ft wide with a 10.2 ft span. Simply supported along the 20 ft edges only. The applied axle...
  2. CTW

    Second Floor Concrete Slab Analysis

    Attached is the first floor plan for an existing two story building. The second floor is 5.5" thick reinforced concrete. The building is around 40 years old. No drawings exist so we had the reinforcing located in the slab, then certain areas chipped out to reveal the rebar. The rebar is #3 @...
  3. CTW

    WT seat (for runway girder) welded to wide flange column tips

    This subject is similar to thread507-309829. I was starting to get questions specific to the connection detail I posted on the aforementioned thread and decided I should dedicate my situation to a new thread before the other one was further hijacked. Now to explain the connection shown in the...
  4. CTW

    Unusual Beam Support for Column Removal

    I'm analyzing an existing beam which had a column removed about 12 years ago. See attached sketch. The beam was supported and extended in an unusual manner. A new beam was added parallel to the existing one with the bottom flange of the new beam welded to the top flange of the existing beam...
  5. CTW

    Critique of column relocation requested

    The attached drawing shows an elevation of one area of an existing mezzanine. The column needs to be relocated 30" to towards the 11 ft span. The existing beams (W14x22) are simply supported over each column but have two bolts in each web and a plate between the webs of the beam. Here's how...
  6. CTW

    ChubbySmack

    Has anyone specified this product or seen it used on projects? I'm just wondering what others think of it. http://chubbysmack.com/Default.aspx?n=1 I saw the add in a magazine and was curious, so I went to the website to understand the product. The presentation comparing this to an anchor...
  7. CTW

    Pyramid of Success

    99 year old, former UCLA coach John Wooden recently passed away. In honor of Legendary Coach John Wooden, read his "Pyramid of Success" from the linked site. A great model for leadership and success. http://www.coachwooden.com/index2.html If this is your first time viewing it, then I hope its...
  8. CTW

    Cable Tray Trapeze Hanger Rod Support Replacement

    I'm in the process of determining a method of repair or replacement for existing corroded angles supporting three levels of cable tray and thought I'd see if anyone else has experienced a similar situation or has any ideas to offer. Each level of cable tray is supported by a trapeze consisting...
  9. CTW

    Federal report cites design flaws in Dallas Cowboys practice facility

    http://www.dallasnews.com/sharedcontent/dws/dn/latestnews/stories/100709dnprocowboyscollapse.1edafc8ef.html
  10. CTW

    Lowering a leaning mat foundation

    I've got a client who has a mat foundation supporting a 1,000 kip (fully loaded) silo that is leaning 10". The mat has rotated to produce the leaning silo. The client cannot raise the low end up and wants to investigate lowering the high side. I don't think this is a safe route to take, but...
  11. CTW

    Concentrated load applied to top flange of W-shape

    I'm considering ways to eliminate the resulting torsion from a 3 kip horizontal concentrated load applied to the top flange of a W-shape and would like some opinions. The space between the flanges on one side of the beam have to remain clear of obstructions and a wide flange has to be used...
  12. CTW

    Hycomp Compressor

    Does anyone have any experience with booster compressors from Hycomp, or any compressor for that matter? If so, how would you rate them?
  13. CTW

    A516 and A515 Comparison

    From what I've read, A516 is preferable for use in low to moderate temperature pressure vessels and A515 is preferable for use in intermediate to high temperature pressure vessels. What is the difference in properties and structure of these two steels that makes A516 suited for low temps and...
  14. CTW

    Thermal Expansion Behavior

    I'm evaluating a steel "bucket" with four legs attached to the side. The "bucket" is simply what you envision. A cylinder with a bottom. The top is open. There are four legs that are symmetrically placed around the perimeter and welded to the side of the bucket but not attached to the floor...
  15. CTW

    Acceptable amount of rust on rebar

    I wanted to get some opions from others as to how much rust would be acceptable on rebar. I've got a project that was stopped for about 9 months and the rebar had been fabricated but left exposed to weather at the site. There does not appear to be any flaking or scaling. The application is...
  16. CTW

    Restraint at top of column

    I've got an unusual situation for supporting a wall mounted jib crane and wanted to see if some others in the forum could offer suggestions or maybe have encountered something similar in the past. The building column is not strong enough to support the jib crane (the column is built from cold...
  17. CTW

    Column Base Detail for High Tensile Load

    I'd like to get some opinions on this column base detail I'm working on. I've got a high tensile load on a column (177 k). This application is in an industrial facility and construction is limited to down days. The foundations can be constructed in one day, but the structure cannot be erected...
  18. CTW

    HSS punching shear check

    I've misplaced my HSS connections guide and need to wrap up a design ASAP. I was wondering if anyone would care to post the relative equations and limit states for a single plate in tension along the face of a rectangular HSS? I guess I've now got a good reason to order the 13th edition.
  19. CTW

    Liquid storage tank "sloshing" weight

    In ASCE 7-05 section 15.7.6, it lists a Wc variable which is defined as the portion of the liquid weight sloshing. Can anyone offer any guidance on how this is calculated?
  20. CTW

    Subsitute API pipe for ASTM HSS

    I have spec'd 16" O.D. round HSS for a project (bending application). The fabricator has a large quantity of 16" O.D. API 5L X70 that is available at less cost. The yield strength of the API pipe is greater but I'm not familiar with the API standards. Is anyone familiar with API and its use...

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