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  1. pba

    Steel grade A656 European equivalent

    This is an apparently simple question which is proving difficult to get an answer to! We have some platework under stress at an elevated temperature. Our mechanical engineer has given an allowable stress value based on an ASME code assuming steel grade A656 - which I think is an ASTM...
  2. pba

    Steel for cold environments

    Two questions: We have a project in Russia which will have exposed steelwork and winter temperatures of -45 degree celsius. - What type of steel would you use? Given the steel grade what special designs/techniques would you use in the connections to ensure that brittle fracture did not occur?
  3. pba

    Plate stresses

    Folks, This is a theory question rather than an actual problem. Some background - The company I work for has an old design guide for design of air ducting. The formula for plate stress under uniform loading is given as: fb = (K1 Q X^2)/t^2 Where fb is plate stress, K1 is a factor relating to...
  4. pba

    Seismic Acceleration

    I have a small steel structure to design. Late in the design I have been informed that I need to consider seismic action. I've previously used UBC 97 for this using the static force procedure. For this project however all I'm given is an acceleration value of 1.6m/s2. Can anyone advise how I...
  5. pba

    Minimum Horizontal Load for AISC LRFD design

    I'm setting out a basis of design document, without access to all the necessary codes. We are to design a steel framed building which will be subjected to dead, live and wind loading. I'm not familiar with AISC LRFD design processes. Under British Steel design codes there is a Notional...
  6. pba

    Steel frame design in India

    We are likely to be undertaking a design for a building in India. This will be a first for us as our previous projects have been in the UK and Middle East. The building will be steel framed but our preliminary research shows that Indian Standard rolled steel sizes only go up to 600mm depth for...
  7. pba

    Storm Water Attenuation design parameters

    Here is a philosophical question: We have a new building to be constructed on a site where the storm water run off will discharge through an attenuation facility. After periods of heavy rain the tank will be full of water and will take about two days to empty. The location has quite high annual...
  8. pba

    Seismic Options design

    We are at early concept stage for a building in the UK which will require to be designed for seismic conditions. We currently have a 9m (29.5ft) square structural grid and a regular building shape. I'm giving some thought to flat slab construction, possibly post tensioned. This is where I hit...
  9. pba

    Notional horizontal forces

    Hopefully a quick question: In the UK steel code, there is a requirement for frames to resist a notional horizontal force, in the absence of greater actual horizontal forces. This notional horizontal force is defined as 0.5% of the factored vertical load. Do US codes make a similar provision?
  10. pba

    Rotting in Marine Plywood

    We are looking at a project where marine plywood has been used as flooring, with vinyl glued to the plywood. The subfloor is wet and the plywood appears to have a high water content. I imagine that there is a strong possibility of rotting but have found no direct evidence of this. Is there...
  11. pba

    Simple concrete design ACI 318

    I hope this is a very simple question for most of you. I’m based in the UK but we have a project in the Middle East, which will require us to use ACI 318M as the concrete design code. This looks like a very different document to our British Standard BS8110 and I’m having difficulty...
  12. pba

    Curvature on straight steel beam

    This may be of more relevance to UK engineers but anyone with something to say please feel free to do so! Straightness tolerance on universal beam sections is given by BS EN 10034 as 0.3% x length for beams up to 180mm deep. So, for a 9000mm length the curvature can be up to 27mm. National...

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