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  1. tngv752

    Serviceability wind speed and ultimate wind speed

    Agent, Thanks for your comments. The wind speed of 30m/s is just an example number. It can be 25m/s or 35m/s depending on how much is the loading area. We already have a member size of roof rafter, roof dimensions and spans. So we need to check the maximum wind speed applying to the roof...
  2. tngv752

    Serviceability wind speed and ultimate wind speed

    Steve, Thanks for your comment. It's a small roof to cover a front cafe. The rafter length is varied from 3m to 10m long. The rafter can take a maximum wind speed depending on the span support based on the strength capacity. However, using AS1170 for deflection check under serviceability wind...
  3. tngv752

    Serviceability wind speed and ultimate wind speed

    yes, it's retractable roof for deflection check.
  4. tngv752

    Serviceability wind speed and ultimate wind speed

    Based on the Australian code, ultimate wind speed is V500 = 45m/s (Region A) and the serviceability wind speed is V25 = 37m/s (Region A). I wonder if a roof structure is only allow to operate when the wind speed is 30m/s. So what is the serviceability wind speed to be used for serviceability...
  5. tngv752

    Stiffen raft slab

    The attachment is bore hole log.https://files.engineering.com/getfile.aspx?folder=773bc0b9-5444-4fe8-b24a-40712c952cb2&file=Doc7.pdf
  6. tngv752

    Stiffen raft slab

    I have to design footing for a residential 2 storey building with timber floor and roof. The external wall is 150 thick RC wall. The non load bearing internal wall is timber stud wall. The ground floor is 1m above the ground. The geotechnical report show that the uncontrolled fill (sandy clay)...
  7. tngv752

    Piers sitting in the existing concrete slab on ground

    I agree with Oldestguy to provide a footing above the slab for each column. Of course , I provide some bars drilled and epoxy into the slab to hold the footing and slab. By this way, the load can be spread out under the slab and give lower pressure on the soil. The pier will be 400mm diameter...
  8. tngv752

    Piers sitting in the existing concrete slab on ground

    An owner want to build a one storey house above the existing swimming pool. Small part on the top of swimming pool will be demolished. The owner want to keep the swimming pool base slab (150mm-200mm thick). New ground floor of reinforced concrete (RC) suspended slab will be supported by the RC...
  9. tngv752

    Loads applied on a suspended slab

    My friend ask me to review a structural drawing of 3 storey residential concrete building. The building structure include reinforced concrete (RC) column, wall and suspended RC slab (200mm thick) for each storey. The applied load for suspended concrete slab design include self weight, imposed...
  10. tngv752

    Slab on ground with high reactive soil

    According to geotechnical report, the existing fill, the topsoil, and colluvium soils is not suitable for the founding to footing. The soil is Class H (high reactive soil). Due to high potential differential settlements of the existing underlain soils, it is recommended that the building is on...
  11. tngv752

    Slab on ground with high reactive soil

    I review the drawings for footing construction of a residential building. The strip footing/piers o shale was designed. The piers were 2.5m spaced and strip footings are spaced at 6m max. to support brick walls above. The concrete slab on ground is 150mm thick with 2 layer of steel reinforcement...
  12. tngv752

    Shade sail design

    Any recommend for the finite element program to analyse the tension membrane due to the wind load so I can get all reactions (mainly lateral tension force ???). Can be ETABS ?
  13. tngv752

    Shade sail design

    Anyone have any link or document for guide of hade sail design including all the shade and steel and detail design ? Thanks
  14. tngv752

    How to estimate the downstream flood level for residential stormwater design ?

    I need to estimate the downstream flood level for the OSD calculation (see the attachment at OSD calculation part). It's Parramatta in Australia. If I am not wrong, we need flood map from council to work out level ...
  15. tngv752

    Earthquake loads considering directional effects by adding 30% load of orthogonal direction?

    I know some codes from different country similar. In Australian code AS1170.4 Section 5.4.2.1 say: "For structural components and footings that participate in resisting horizontal earthquake forces in both major axes of the structure, the effects of two directions determined separately shall be...
  16. tngv752

    AS1170.4 Section 5.4.2.1

    I need an explanation of AS1170.4 Section 5.4.2.1 say: "For structural components and footings that participate in resisting horizontal earthquake forces in both major axes of the structure, the effects of two directions determined separately shall be added by taking 100% of the horizontal...
  17. tngv752

    How to estimate the downstream flood level for residential stormwater design ?

    The OSD will discharge water into the street gutter through a stormwater pit (stormwater pit with inlet pipe and orifice outlet). Downstream flood level will help me to obtain orifice and overflow weir level.
  18. tngv752

    How to estimate the downstream flood level for residential stormwater design ?

    For OSD (Onsite stormwater detention) calculation, I am not sure how to estimate the downstream flood level for 1.5 year and 100 year flood level. Thanks
  19. tngv752

    Etabs Slow Performance

    I am not sure about time-history analysis. But, I feel Etabs can be slow when I model a complex high rise building. I use CPU i7 - 3770 16GB 4GB graphic memory. Sometimes Etabs 13 has some bugs. They make your modelling error and become overflow memory.
  20. tngv752

    Stair wall subject to lateral load

    Yes, it is the right scale. Of course, I have coupling beams on top the openings. These beam sections are big enough for using conventional steel reinforcement. But the pier I mentioned has a small cross section because the opening is too close to one side (It is the stair way not elevator). I...

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