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Recent content by jeg

  1. jeg

    Fire in stone filled containment basin

    thank you dik and bimr - i shall pursue both advices.
  2. jeg

    Fire in stone filled containment basin

    I am designing a bulk hydrocarbon (petrol, diesel) loading facility for rail wagons (12 per train). In case of spillage there will be a containment basin below track level. Containment basin will be approx 150m x 15m x 1.5m deep. To reduce fire risk and to support the track, the basin will be...
  3. jeg

    Wind load on canvas covered frame

    Yes, WindX, I am using BS6399 part 2, but came to similar conclusion. I followed several different wind loading routes including the parapet and sign scenarios and used the most onerous loadings. Interesting remark about the unbalanced loading - I did not apply unbalanced wind loads but do have...
  4. jeg

    Wind load on canvas covered frame

    Yes, that was my first reflex but then I wondered if I might be missing something - it seemed to be too easy! Thank you Wildehond for confirmation. Does anyone think we are barking up the wrong tree?
  5. jeg

    Wind load on canvas covered frame

    I have a rectangular frame 2500mm x 1000mm made of circular hollow section. The frame is infilled with a strong canvas, blanket-stitched to the frame. Wind applies a load of 1 kN/m2 to the canvas. What is the loading on each frame member?
  6. jeg

    Beam Analysis Software

    www.masterseries.co.uk produce very user friendly software that suits all my structural needs
  7. jeg

    Stresses in wall of vacuum chamber

    Thank you Prex and JStephen. The vacuum chamber will be used for mixing and moulding polymers in a gas free environment. Yes it will cycle on and off approximately every hour. Your comments are all very helpful and informing my development process. All further comments will be very gratefully...
  8. jeg

    Stresses in wall of vacuum chamber

    Thank you Prex. I shall be using a cuboid, external, structural frame, not yet defined, but probably rectangular hollow section with plate steel sheeting (approx 5mm but hoping to refine to 4mm) operating as a membrane to form the sides. Stresses in the membrane calculated from www.xcalcs.com...
  9. jeg

    Stresses in wall of vacuum chamber

    Thank you all. membrane action saves the day with plate thickness down to approx 5mm - still to be refined and checked. There are some great interactive formulae on www.xcalcs.com (rectangular membranes:4 supported and fully held sides: uniform load) that proved very useful and saved me having...
  10. jeg

    Stresses in wall of vacuum chamber

    Thank you Ron for supporting my Peter Pan daydreams; unfortunately my homework days are 35 years in the distant past! Shape of cabinet is defined by the client, who also requires a full wall to open as a door. corus and rb1957 , Initial calculations with fixed perimeter (welded to steel frame)...
  11. jeg

    Stresses in wall of vacuum chamber

    Consider one wall of a rectangular vacuum chamber(approx 1m x 1m). The wall is thin steel plate welded to the rectangular steel frame(box section). The pressure applied to the plate is maximum one atmosphere = 101.3 kN/m2 The pressure will produce shear and tensile stresses in the plate. The...
  12. jeg

    Lateral Restraint of Roof Purlins

    Thanks for the info, RMalaska. In the UK it is not usual to have sheathing nailed to the rafters. We drape waterproof membrane over the rafters and hold it in place with battens nailed to the rafters. The tiles are then hooked or nailed to the battens. This is not nearly so restrained as your...
  13. jeg

    Lateral Restraint of Roof Purlins

    Consider a house roof designed to maximise useable space - no trusses. The concrete tiles rest on battens which rest on timber rafters. The rafters span from eaves to apex and are supported by steel PURLINS at mid span. The rafters are bird mouthed over the purlin and "may" be nailed...
  14. jeg

    Lateral Restraint of Roof Purlin

    Consider a pitched roof on a house. The tiles rest on battens which rest on timber rafters. The rafters span from eaves to apex and are supported by steel PURLINS at mid span. The rafters are bird mouthed over the purlin and "may" be nailed to a timber runner bolted to the top flange...
  15. jeg

    Inadequate Embedment - Looking for Ideas

    Is the existing concrete section reinforced. If YES, consider how one would extend the rebar. We would look for adequate lap to produce teh required anchorage bond. Edge istance is still an important factor, but is reduced by the links binding the main bars. Can you apply similar reasoning to...
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