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  1. chencfp

    Flat Wood Roof

    I am wondering if it is practical for flat roof by using wood material (ie, Wood truss or 2x12 with 3/4” plywood deck, then applying waterproof material and shingle. Where I am able to find a specification or standard for this type application? Thanks.
  2. chencfp

    Metal Roof Waterproof Materials

    hokie66, Thanks. We will use 3" gage 18 deck.
  3. chencfp

    Metal Roof Waterproof Materials

    Ron, Jike, Thanks. We will use 9' oc span (we use WF beam instead of barjoist), the clear span will be around 8'. Beside the welding (metal deck weld to WF) and metal deck deflection, what other problems I need to concern according to your experiences? Thank again.
  4. chencfp

    Metal Roof Waterproof Materials

    Ron, Thank you for your help. I am right now starting to read your provided references. One more question for you. I saw some projects in this area and typical roof span is around 5-ft. Is it adequate to have span at 9-ft (more than 3 spans)if we use thick metal deck (ie, 18 gage deck)? Thank...
  5. chencfp

    Metal Roof Waterproof Materials

    Thank you all. The project is in NY. We use metal roof deck on WF beam (flat roof). I don't have any experience for details above metal deck. I saw some project around this area. They use insulation, rubber sheet, and apply some liquid (for waterproof?). But I don't known how those layers...
  6. chencfp

    Metal Roof Waterproof Materials

    I would like to learn more about metal deck roof with waterproof material construction details. I am wondering if some one here can give me suggestions or references. Thanks.
  7. chencfp

    Beam to Beam Connection Detail

    Thanks. BArtired, I am also concerning the stability issue around concrete wall and W36 beam. It is easy to understand for adding stiffeners according to AISC 13th J10.4. But it seems still need a diagonal bracing to prevent overall movement such as wall horizontal deflection. We use metal deck...
  8. chencfp

    Beam to Beam Connection Detail

    Thanks all. According to my attaching sketch, the concrete wall is parallel with the main support beam. Is it adequate to consider the W27 as W36 compression flange lateral bracing?
  9. chencfp

    Beam to Beam Connection Detail

    Thanks DaveAtkins, Can you please talk about how to check sidesway web buckling in the supporting beam? Thank you again.
  10. chencfp

    Beam to Beam Connection Detail

    I am working on a beam connection design. According to Steel manual and reference book examples, most of connections are both beams' top flange at same level. I did not find any case with one beam placing on top of another beam. Is it adequate to place one beam on top of another beam if room...
  11. chencfp

    Beam cambering

    Thanks all for sharing so valuable information.
  12. chencfp

    Beam cambering

    Thank you. It is more than 2000 dollars for cambering each 60 span W40x324.
  13. chencfp

    Beam cambering

    I have a WF beam (W40X324)cambering issues for help. We have a 60-ft span beam and will deflect about 1.5" under dead load. It will be expensive to camber this beam to 1.5". The beam will be under L/240" deflection under total load. Do I need to camber the beam? Any suggestions? Thanks.
  14. chencfp

    Need help on bar joist, flat roof and beam cambering

    I have some questions and need helps: 1. How to weld the horizontal bracing to bar joist top and bottom chords. I saw a lot of connection using bolt. But we think welding is easer than bolting (it is diffcult to make correct hole location on bracing angle). 2. We are going to construct a flat...
  15. chencfp

    Aspect Ratio of Small Tower

    For analysis point of view, you need to consider wind speed in the tower site per ASCE 7. you might also need to consider "P-Delta" effect from dead load. For fabrication porint of view, the straight section is easer to fabricate than tappered section. Your tower base width can go as small as...
  16. chencfp

    Size of Coarse Aggregate

    We are going to construct a reinforced concrete continue beam. Since the long span and loads, the beam is heavy reinforced. We concerns that the standard coarse aggregate is difficult to be poured into the beam. We want use small size coarse aggregate. The ready mix company told us that the only...
  17. chencfp

    Parking Garage

    Thank you very much. We were also looking into the standard W-shape steel with joist truss and concrete slab. But we concrened the deflection limit. We also thought that the camber might be required for about 60-ft span (The exact span for our project is 55-ft and 47-ft, and one Beam/Girder span...
  18. chencfp

    Parking Garage

    Teguci, Thank you very much. could you please explain more about "Plaza System"?
  19. chencfp

    Parking Garage

    Thank you all for replying my question. The project will be in North of New York State. The building will be used for performing art stage and the roof will be used as parking deck (for cars only). We are now going to choose one material between prestressing concrete and Smartbeam system...
  20. chencfp

    Parking Garage

    I will design a building using roof as parking garage. The roof span will be 60-ft. could someone here tell me the following questions: 1. What type materials (steel truss, steel beam or prestress concrete) will be the best fit 60-ft span? 2. What is live load for parking garage? Thanks.

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