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Recent content by OAP

  1. OAP

    Crack width calculation

    Hi Folks, Do anyone have an idea how to calculate the crack width in concrete bored pile? This bored pile is 40" Dia. and used as anchor pile during perforrm the static load test Thanks in advance Cheers, OAP
  2. OAP

    LNG Storage Tank Foundation Design

    Hi Folks, I got to do the preliminary for the LNG Storage Tank Foundation which tank has ID=76m, OD=80m, Height = 39m & volume of 150,000 cu.m. The tank weight is 65,000 ton & Hydrotest weight is 80,000 ton. I'm not sure for the design such huge foundation like this,Has anybody had the...
  3. OAP

    Offshore structure reference

    Hi you guy I 'm studying about the offshore structure and I'm looking for the good reference to understand it. Any reccomend be appreciate. Thanks OAP
  4. OAP

    Buit-up wide flange

    Hi all, I'm doing the design work for the curved roof. Firstly, I decided to use the tubular section to bend to form the curve but unfortunately the contractor cannot bend the tube and they asked me to redesign for the built-up wide flange section (the preliminary size is around W10)...
  5. OAP

    Vortex shedding

    Thanks again you guys, Your suggestion is very helpful for me. Furthermore, after I did the dynamic analysis in 3D, I got the first 3 mode frequency as follow: 1st mode = 16.05 Hz 2nd mode = 19.01 Hz 3rd mode = 19.7 Hz. I think the dynamic...
  6. OAP

    Vortex shedding

    Thanks all, Actually, my structure is not a stack. It's a logo sign dia. of 10.0 m. which stand on the roof top of building. The level of the sign is about 210.0m from ground level. The thickness of sign is 0.30m and when included the supporting frame is to be 1.50m. There is a steel...
  7. OAP

    Vortex shedding

    Hi all, Do anybody know simply calculation of the effect of vortex shedding on structure? If I have a circular plate 10.0m dia. and wind blows right to it. Thanks OAP
  8. OAP

    soft and weak storey

    Hi, According to UBC code Soft story = the story which the latteral stiffness is less than 70% of the stiffness of the story above. Weak story = the story which the story strength is less than 80% of that the story above. For more detail, please see in...
  9. OAP

    Roof top signage

    Hi all, I have got the job for design the structures to support the signage dia. 10.0 m at the face of existing building on level +210 m. from ground. The basic wind pressure that I use, is 2kN/sq.m. What I must concern for design the supporting structure ie., dynamic effect...
  10. OAP

    fireproofing for steel members

    As the result from lab testing, the intumescent can resist fire about 2 hours
  11. OAP

    Opening in structural steel roof

    Hi, I'm designing the house which has 8.0m.x8.0m. (width x length) roof without the intermediate support and the client want to have the opening about 2.0m.x 2.0m. at the middle of the roof for the skylight (it looks like a pyramid with cut the top part of pyramid off). I plan to use...
  12. OAP

    Prestressed column

    Thanks all, I have further question as in case of slender column as I mention above, if I do the non-linear structural analysis and the result shown me that the magnitude of the bending moment don't have any different from linear analysis, let say 3% diff. Can I use the bending moment from...
  13. OAP

    Prestressed column

    Hi folks, Let's assume we have a long column (10.0m height ) and cross section of column is 0.3*0.3 m. which we can't have the lateral restraint to reduce the slenderness ratio due to the architectural concept. This column are spacing 6.00 m. and have to support roof truss span of 25.0 m...
  14. OAP

    Blind concrete ?

    Hi, I'm curious why we have to put the blind concrete underneath the spread footing or ground slab? It jsut for protect the debris from soil to mix with fresh concrete. Is it neccessary to have other layer of compacted sand under the blind concrete. Please share your opinion...
  15. OAP

    Popular Structural Analysis software

    Thanks all Sorry for my thread which repeat with other before OAP
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