Hi,
We are using Staad Pro for modeling octagonal pile cap with 4.97m sides and having octagonal cutout of 1.66m sides at the center
Reinforcement of piles will have development length inside the pile cap for carrying uplift/tension, compression, shear and bending moment at connection between pile to pile cap. Please see the attached picture of reinforcement detail of connection between pile and pile cap.
Image may be NSFW.
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We have query related to below given 3 conditions, out of these which will be reflecting actual behavior in the Staad Pro model?
Condition 1 – Pile cap is modeled with piles, with fixed supports at the bottom of pile. Length of pile is equal to length of fixity, in our case it is 3.5m. Please see the attached picture of the Staad Pro model.
Image may be NSFW.
Clik here to view.
Condition 2 – Pile cap is modeled with piles, with fixed supports at the bottom of pile and piles are having moment release at the top of the members. Is it appropriate to model pin connection seeing anchorage of pile reinforcement in pile cap (refer figure of "pile connected to pile cap", as above)
Length of pile is equal to length of fixity, in our case it is 3.5m. Please see the attached picture of the Staad Pro model.
Image may be NSFW.
Clik here to view.
Condition 3 – Pile cap is modeled without piles, with supports provided at pile locations at pile cap level. Support conditions are moment release with spring constant in three direction of displacement viz. X, Y and Z. Please see the below given picture of the Staad Pro model with description of support condition.
Image may be NSFW.
Clik here to view.
PS : In attached pictures of Staad Pro model, the vertical members seen like columns are concrete pedestals for supporting the structure.
Could you please reply, at the earliest possible.
Regards,
Manish Chhugani
