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Showing content with the highest reputation on 05/01/19 in all areas

  1. You can go through the tutorial on this post:
    1 point
  2. That would provide you with the concrete strength of existing building at locations where you have taken the core, but other things that you need to confirm are if reinforcement provided matches the drawing and if the structure was built according to the drawings. You need to spot check reinforcement using PUNDIT for general elements and thoroughly check critical elements, check geometry, and use of existing building against the design drawing and also you need to know what code the existing building was designed too. After all that, you can evaluate the structure and then proceed with foundation checks.
    1 point
  3. Ayesha

    Hinges

    Force control means behavior would be determined based on the amount of force specified and displacement control means that the behavior is determined based on the amount of displacement specified.
    1 point
  4. C/B ration should be greater than 1. It should be 1.4 according to IS cod 2016, 1.3 according to eurocode, 1.2 according to ACI code. It ensures that moment capacity of columns at a joint is greater than that of beams. B/C ratio is inverse of C/B ratio. I should be smaller than 1.
    1 point
  5. Ratio of flexural capacity of Beam/column is computed to preclude the formation of plastic hinges in columns for obvious reasons, refer to section 21.6.2 of ACI 318-11. Sum of flexural capacities of column at a joint should be 1.2 times the capacities of beam framing into the joint in particular direction. Etabs alerts user when the ratio exceeds; if it does not alert, it means either you are ok, or you have not activated corresponding seismic category (I think it calculates for category D E & F) for which this capacity needs to be computed. When capacity is exceeded, we can increase the size of column, or reduce the size of beam, or play with reinforcement of members. It has nothing to do with redistribution of moments; If both end of column will yield, during a seismic event, in a particular story, structure will most probably collapse. In a frame, that is resisting lateral loads, you cannot take away the ability of beam to develop negative moment; if you do not provide top reinforcement, it will not be called a moment resisting frame, and will not resist lateral loads..
    1 point
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