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  1. karthik_m

    AISC Seismic Design Manual Diaphragm

    Hello, please see the picture attached. A page from example 8.4 of AISC Seismic Design Manual Pg8-21. I'm trying to understand what does the statement below the calculation mean: "Note a mechanism needs to be provided to transfer the force from the slab reinforcement into the structure" ?
  2. karthik_m

    Built Up section Weld size

    Apologies, I was not clear, it's a part of a lateral system BRB . The section is used for a lateral column. It would have significant axial load,around 12-16000 kips, its a 27story building. Please let me know the exact procedure ? Any example calculation would be of great help too. Thank you.
  3. karthik_m

    Built Up section Weld size

    https://res.cloudinary.com/engineering-com/image/upload/v1596813022/tips/Built_Up_section_weld_size_oogrto.pdf Please see attached sketch, How to size the weld between the added 1 ¼” plates and the standard wide flange section? Thanks!
  4. karthik_m

    Design for Fire conditions per AISC

    Hi, Does anyone know if we can ignore resistance factor (Φ=0.9) in LRFD when designing steel members for fire conditions per Appendix 4? If so can someone point me out the exact reference?
  5. karthik_m

    Software to design Multistory Concrete Columns

    @ KootK: What is S-concrete? I do it the old school way calculating trib areas from drawings for each column and then designing them separately in SP Column. Okay good to know ETABS is good for design of RC Columns.
  6. karthik_m

    Software to design Multistory Concrete Columns

    @KootK : Have you used ETABS? Have you ever found any issues with the software?
  7. karthik_m

    Software to design Multistory Concrete Columns

    Hello, I am looking for a software that is reliable enough to do multi story RC Columns rather than going old school and calculating trib areas from drawings for each column and then designing them separately in SP Column. Any inputs or thoughts shared would be beneficial ? Any good or bad...
  8. karthik_m

    Steel gravity columns design

    @oopenhegan: I really didn't understand. Is the question towards me? I am analyzing my building just by modal analysis ( linear dynamic analysis).
  9. karthik_m

    RAM SS Gravity column Design

    @joshplum: I agree that Equation H1-3 governs but the in-plane instability is checked by equation H1-1a and I can't see (8/9)*Mrx/Mcx ( which comes around 0.15) been added to Pr/Pc (0.819) which gives a DCR of 0.97 which is greater than what we get from Equation H1-3.
  10. karthik_m

    RAM SS Gravity column Design

    The gravity column design interaction equation H1-1a in RAM SS does not account for the Mux/(0.9Mnx) in the unity equation. Why is that ? Please let me know if someone has faced the same issue. Thank...
  11. karthik_m

    Steel gravity columns design

    http://www.iitk.ac.in/nicee/wcee/article/14_05-05-0112.PDF Guys I'm referring to this paper! Please let me know what do you think Thanks!
  12. karthik_m

    Thermal Analysis in Risa 3D

    Hey guys, I'm doing a thermal analysis in Risa 3D. I have a couple of questions : 1. What direction is the thermal load applied in RISA? I know it has "T" direction symbol to apply a thermal load. But when applied in the model it shows that the load is applied in the downward direction. Can...
  13. karthik_m

    Deformation response spectrum

    Hey, I am wondering why the deformation response is the same for buildings higher than 10 secs natural period of vibration. Anyone could help? Thank youhttps://files.engineering.com/getfile.aspx?folder=58f241b2-1c43-4481-a4ed-65969f01f1b4&file=Capture.PNG
  14. karthik_m

    Web of W section gravity girder Haunched for mechanical ducts

    Thank you @kootk
  15. karthik_m

    Steel gravity columns design

    @KootK Thank you, I agree with your explanation. But if that is the case then why do we check drift induced moments for gravity concrete columns in a Slab only system without beams where the main lateral force resisting system is Shear wall ?
  16. karthik_m

    Steel gravity columns design

    @Once20036 If the building drifts in EQ then wouldn't the gravity columns also see the same drift and then the moment caused due to P delta ?
  17. karthik_m

    Steel gravity columns design

    @jayrod12 RAM does lateral and gravity analysis separately. So yes P delta is turned on but it is in the lateral part of the model which designs only the lateral members I guess. But I wanted to know if that should be something we should be concerned about. Also, to get the moments we need to...
  18. karthik_m

    Web of W section gravity girder Haunched for mechanical ducts

    Please find the attached filehttps://files.engineering.com/getfile.aspx?folder=67796bfe-cf0f-46ba-8359-1cd57c458179&file=Web_Opening.pdf
  19. karthik_m

    Steel gravity columns design

    When we design steel gravity column design do we need to consider the drift induced moments in the steel gravity column? I'm modelling the steel in RAM Structural system and I don't think RAM does it since I don't see any moment in the gravity column. Please let me know. Thank you
  20. karthik_m

    Web of W section gravity girder Haunched for mechanical ducts

    Hey I'm trying to analyze the girder after it is being haunched for mechanical ducts. How do I design it? What are the main checks?

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