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  1. rejoicer

    How to calculate story drift for response spectra analysis?

    When perform reponse spectra load case in X direction, there is always some forces in Y direction. Sometimes the forces in Y direction is pretty large or even close to force in X direction. Therefore the drift in Y direction is close to the drift in X direction. So how to check the story...
  2. rejoicer

    How to calculate drift of response spectra analysis?

    When perform reponse spectra load case in X direction, there is always some forces in Y direction. Sometimes the forces in Y direction is pretty large or even close to force in X direction. Therefore the drift in Y direction is close to the drift in X direction. So how to check the story...
  3. rejoicer

    How to model cracked section in Etabs

    According to 10.11.1 of ACI318-05, concrete shear wall should use 0.70Ig in the model. How to consider 70% reduction in Etabs? Reduce modulus of elasticity to 70% or set stiffness modifiers to 0.7. Thanks.
  4. rejoicer

    should cracked section be used for wind drift calculation?

    When checking the drift of high rise building with concrete shear wall under wind, should the cracked section (ACI 318-05 10.11.1) be used? Are these cracked section factors for strength design only or for both drift check and stregnth check? Thanks
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