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  1. Zhuge

    Heat Treat Pre-engineered building column

    agree with hokie66 here. temperature treatment after heating would be really difficult to be done.
  2. Zhuge

    Salary range for Structural Engineer in Various Area

    Hi Guys, I am planning to work overseas for couple of years. Any of you could give me the median salary range for structural engineer in your area ? My specialisation would be Oil and Gas Industry, offshore and onshore. I would prefer to move to either Australia, UK, or Middle East. But I...
  3. Zhuge

    Steel Tank

    1. Compare with similar tank structure that has similar platform. Probably this is the easiest way. 2. From my past experience, for steel tank with WT 6 mm, tend to be overstressed by a platform load. assuming the platform width = 1000 mmm and LL = 2.5 kPa. 3. Another option is provide a repad...
  4. Zhuge

    Design Methodology for Precast Concrete Piperack

    wouldn't it be easier to use steel as a piperack ?
  5. Zhuge

    Seismic design of footing

    yes. the reason is you need to ensure if it fails, it fails at steel member rather that at foundation. (it would be quite costly to repair). I think design codes state that you can avoid using overstrength factor when you design the foundation as long as S*fy*overstrenght factor < design moment...
  6. Zhuge

    Seismic design of footing

    Hi SHBH, I am not quite sure whether you're familiar with capacity design or not. However, since you decided to design the steel member using ductility factor = 3.25, You don't have any other choices but to design with capacity design. That means you will expect to have some yielding at your...
  7. Zhuge

    Seismic design of footing

    As you designed the steel member with ductility = 3.25,the column member size should be much more smaller than if you design it elastically. However, your foundation should be able to have bigger capacity to allow the steel member yield first. Therefore, You need to use steel member section...
  8. Zhuge

    Does bolting an angle to a C channel form a built up section

    It won't change the unbraced length. To reduce the unbraced lenght, you need to restraint the compression flange frome any rotation.
  9. Zhuge

    Seismic Loads for Intermediate Mezzanine

    I don't know How advance your software is. You can generate a level 2 spectra. from that spectra you can design the mezzanine level separately by assuming the mezzanine sitting on the ground with seismic spectra = level 2 spectra.
  10. Zhuge

    Interpretation of the intent of NZS 3101:206 and ACI 318-02

    agree with JAE, you won't calculate them twice, because in Ma part, you only multiply gravity load with the eccentrity, and the result wont be as big as design moment.
  11. Zhuge

    Interpretation of the intent of NZS 3101:206 and ACI 318-02

    Having read these 3 points you stated above, actually they are not separate points, they are related to each other. Step 1, you need to know the eccentricity of the bearing point to the centre of the wall. Then apply Gravity load from the floor/roof multiply by the eccenticity = Ma Step...
  12. Zhuge

    CAD and engineering fee split

    that depends on the type of projects, some of the projects require more sophisticated CAD layout, some look simple but require sophisticated engineering effort. I would say engineer : designer = 1:2 overall.
  13. Zhuge

    Vessels category per IS 1893

    Unfortunately, I dont have that strong mechanical background. I've asked my mechanical engineer coleague and he is quite keen to help to indentify the hazard level if you give more specific info about the vessel. such as, the volume, content, design temperature, and the design pressure. I hope...
  14. Zhuge

    Another Crazy Siesmic Questions

    the pendulum always counter the inertia forces of the building from ground shake. as simple as that. Thats why old temples in japan are proven to be seismic resistant
  15. Zhuge

    Lifting Loads - Proper Way to Account for in Design

    Normally for onshore structure, the dynamic amplification factor is taken as 1.25. You also need to consider how many points of lifting are going to be used. Usually, 4 lifting points for typical equipment's protection frame. Bear in mind, when you design the padeyes, you also need to consider...
  16. Zhuge

    Damping Ratio for Secondary System

    because you want this secondary system to behave elastically during big earthquake, I suggest you to take a 1% damping.
  17. Zhuge

    Vessels category per IS 1893

    Normally vessels in a gas plant can be categorized from Hazard level A,B,C, and D depending on the design temperature, pressure, and contents inside the vessel. You can derived the hazard factor in seismic standard from this mechanical point of view. you also need to consider the surounding...
  18. Zhuge

    design of two way slab

    I suggest you to use strut and tie method, or to use finite element method to calculate the reinforcement needed.
  19. Zhuge

    slab on grade

    if you know how big the concentrated load imposing the slab, you may start derive slab thickness from "punching shear" equation or you can use appropriate design tables for that kind of slabs.
  20. Zhuge

    Type S2 Earthquake

    You can modify any earthquake records to satisfy the spectrum. to get the earthquake records, you can try to browse PEER database. I suggest you to use common earthquake records like El Centro or Loma Prieta.

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