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  • Users: SAK123
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  1. SAK123

    Resultant Fabric Surface Temperature with exterior Flowing Air and Ambient temp

    Hi, Maybe someone can point me in the correct direction, I am a structural engineer with a small thermal problem. I have a large section (50'x 50') of tensioned fabric membrane (very thin, R = 0.6) that provides a boundary between the interior and exterior of a small building (acts as a...
  2. SAK123

    ABAQUS explicit reaction force results not matching hand calculations

    This is the first time I have run ABAQUS explicit. Naturally, I want to check the ABAQUS results against hand calculations when I can. In this particular model, I have a simple rectangular plate, pinned boundary conditions on all 4 sides and a non-dynamic uniform load applied (load is applied...
  3. SAK123

    Using wind tunnel coefficients in FEA - time, height, inflation scaling and ASCE wind loading

    I am currently involved in modeling a large inflated structure. The structure wind coefficients were obtained from wind tunnel testing. In reviewing the wind tunnel testing report, the author explains that a ASCE wind requirement of say 160 mph 3 sec gust at 10 meters needs to be adjusted...
  4. SAK123

    Design wind speeds for countries outside USA.

    I have a few projects where I need to select design wind speeds in foreign countries - Italy, Greece, Turkey, etc.. In looking at the wind provision of the IBC - they refer to the ASCE-07 code. No problem, but ASCE 07 has wind contours for the US only. Where can I get design speed wind...
  5. SAK123

    Kevlar decomposition temperaure

    I read that Kevlar degrades at about 800 deg F. This info is all over the www. What I need to know is as the temperature approaches the 800 deg F limit, does the Kevlar change strength / tensile properties ? If I expose Kevlar to 700 deg F for 10 min and then quickly return it to room...
  6. SAK123

    Pressure Coefficients for bullet shaped building

    I have a building that is shaped like a cylinder split down the middle – 1/2 cylinder - placed on its side. THe building is about 180 ft long. The problem is to find the wind coefficients at the building ends when the wind is acting along the cylinder axis (parallel to the cylinder long...
  7. SAK123

    PROPER GROUNDING OF ELECTRICAL EQUIPMENT

    I am building a pressure system made up of 2 blowers mounted onto a metal skid assembly. What is the proper method to gound the blowers onto the skid using a standard ground lug ? I am asking what sequence of components (washer, star washer, ground lug, lock washer, etc..) should I use when...
  8. SAK123

    What is size tubing is required to get a gage visual response ?

    I am using the 2025 model Dwyer gage in a 1/4" dia tube system that can be in tube lengths of 50 ft to 600 ft. I would like to know what tubing diameter allows the Dwyer gage to show changes in pressure when the changes in differential pressure are as small as 1" water pressure. My...
  9. SAK123

    Use True or Engineering Strain to calculation Young's E for FEA ?

    Hello, I am presently involved with measuring the stress strain relationship of a pretensioned sample of fabric material. Needless to say, the strains that I measuring are much larger than typically seen for aluminum and steel. Since the strains are "larger", it occurred to me that possibly I...
  10. SAK123

    What modulus to use - TANGENT OR SEECANT modulus ?

    Is there any guidelines on when the tangent and when the secant modulus should be used in modeling ? I am modeling fabric material so the behavior is non-linear but several people at my office think tangent modulus should be used whereas others think secant modulus should be used in modeling...
  11. SAK123

    ASCE/SEI 7-05 - Wind Pressure Coefficients - Mean or Maximum

    I have a question related to wind pressure coefficients presented in the ASCE/SEI 7-05 - Minimum Design Loads for Buildings and Other Structures. My question relates to the wind pressure coefficients that are defined in this document for standard rectangular buildings. In a typical wind tunnel...
  12. SAK123

    HVAC Seismic Design per IBC 1621.3 - where is 1621.3 ?

    I am in the process of checking a HVAC system for seismic requirements per IBC 1621.3 - a customer requirement. However, in looking at the IBC 2006 document, I do not se 1621.3 anywhere. Does anyone know what was the last year section 1621.3 was included in the IBC for seismic loading ?
  13. SAK123

    QUV test exposure related to actual exposure in field.

    I am involved in using fabric materials for making large structures. Fabric tensile strength after UV exposure is required to determine the amount of material property degradation as a function of UV exposure. At present we just set some samples on a QUV machine for a few thousand hours and...
  14. SAK123

    ASTM B695-04 for coating of Zinc mechanically onto IRON/STEEL.

    For years I have used the ASTM A123 standard for Zinc coating my exposed structural steel materials (angle sections, etc..). I just learned that an alternative method is ASTM B695-04 - Standard for coatings of Zinc Mechanically Deposited on Iron and Steel. Apparently, this ASTM standard...
  15. SAK123

    Anchor rod fatigue in soft joint under wind loading

    Thank you for reviewing this question. I have a concrete wall foundation with embedded concrete anchors placed every 12 inches. The embedded concrete anchors follow ASTM specification have 1554-07a. Placed over the concrete anchors are structural steel angle members. The structural steel angle...
  16. SAK123

    Question: Wind tunnel testing of building structures

    I am presently involved with the wind tunnel testing of a large air supported structure. Just recently I have completed an ASCE two-day continuing education course on wind loads on building structures. After the class was over, I approach the instructor and explained how a wind tunnel tests was...
  17. SAK123

    Uncoated steel concrete anchor bolt corrosion problem

    I'm involved with a construction project that requires the placement of steel concrete anchor bolts in a high corrosion environment. The location of the construction site is in the South Pacific, namely the island of Guam. Anybody who has ever performed any construction or maintenance in that...

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