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  • Users: rteja
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  1. rteja

    Loads on Overhead crash gantry

    Thanks for the response Tomfh. Posted speed limit for this road is 120kmph. This would mean nearly 4.4 MJ of energy to be absorbed. This seems a bit extreme for this steel structure. And i have seen very similar structures already existing on roads. May be as you pointed out, "failure" is the...
  2. rteja

    Loads on Overhead crash gantry

    I am designing an overhead crash gantry of 30m span (see attached image). The client's requirement is "structure to resist momentum of 8000 kg vehicle". I do not have experience in this type of structures. The purpose now is to give steel estimate for my costing team. My question is, can i apply...
  3. rteja

    Required footing reinforcement using ACI vs BS

    Hi, The projects our company does, requires shallow foundation pads for some structures like flag poles, totem sign etc. We are currently outsourcing the design calculations, but i'm learning more about foundation design, and want do the calculations myself in future. I crosscheck my analysis...
  4. rteja

    Reinforcement requirements for short pile foundation

    Thanks Jayrod12. I'm having a moment of 6.2kNm and shear of 2.25kNm at the top of foundation. It is to support a flag type directional sign. The soil is slightly silty with medium gravel and sand.
  5. rteja

    Reinforcement requirements for short pile foundation

    I have a short pile foundation of Dia 600mm and length 1000mm, to support a circular steel post anchored to the foundation. From my calculations, tensile stress in concrete due to bending moment is less than allowable tensile stress. My question is do i still need to consider a minimum...
  6. rteja

    Anti-vibration fixings for signage in metro station

    We have a prospective job where the client asked us to revise our quote considering anti-vibration to all our signage. our signage is mostly post mounted, ceiling suspended & wall mounted, inside a metro station. From a little research in internet, we understood that using anti-vibration mounts...
  7. rteja

    Steel column with base plate and anchor rods. Fixed or Pinned support?

    I'm new to structural design. I've always considered steel column bases / steel beam end connections with anchors as fixed support. I've noticed that my manager sometimes considers them as pinned type and sometimes fixed type. (for very similar applications) This confuses me. Can someone shed...
  8. rteja

    Pull out strength for chemical anchor in hollow concrete blocks

    HILTI suggested for a pullout test
  9. rteja

    Pull out strength for chemical anchor in hollow concrete blocks

    I want to submit a report verifying the pull out strength of chemical anchor bolt installed on a masonry wall made of hollow concrete blocks. The HILTI software has a provision for this, but only for a few pre-defined hollow block geometries. It doesn't allow for customization of brick size. My...
  10. rteja

    Increase thickness of base plate

    I want to increase thickness of an existing base plate of a steel post with a signboard. Welding an additional plate to the existing base plate is not an option because welding is not permitted on-site. Instead can i bolt this additional plate? What other options do i have? The existing base...
  11. rteja

    thickness of breakaway plate for a traffic sign

    Here the thickness of base plate does not affect the intended performance of breakaway system. Since the baseplate is failing in bending, is it okay to increase the thickness of base plate by adding another plate using countersunk bolts? (Welding is not allowed on-site. So it has to be a...
  12. rteja

    thickness of breakaway plate for a traffic sign

    The company i just joined is fabricating traffic signs with breakaway connection, where the plate thickness is 10mm. They have already finished the fabrication. Now the consultant is insisting to consider a design wind speed of 160 kmph which results in a plate thickness of 14mm or more. I want...

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