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Long Term Deflection using SAFE v.12 1

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allam84

Structural
Jun 29, 2011
4
Dear Colleagues
This is to share with you my findings regarding this issue:
In order to find the long term deflection according to ACI318-08 considering the Creep and Shrinkage effects the following tips have to be followed using the SAFE v12:
1- Define Load Patterns for Dead Load (DL), Super Imposed Dead Load (SIDL) and Live Load (LL).
2- Define Load Cases as following:
i) Case 1, to be Load Case type: Static, to be initial conditions: Zero Initial Conditions, to be Analysis Type: Nonlinear (Cracked), to be Loads Applied: DL (1) and SIDL (1).
ii) Case 2, to be Load Case type: Static, to be initial conditions: Zero Initial Conditions, to be Analysis Type: Nonlinear (Cracked), to be Loads Applied: DL (1), SIDL (1) and LL (1).
iii) Case 3, to be Load Case type: Static, to be initial conditions: Zero Initial Conditions, to be Analysis Type: Nonlinear (Long Term Cracked), to be Loads Applied: DL (1), SIDL (1) and LL (0.25), for example.
According to the ACI318-08 (R9.5.2.5) and reference to ACI Committee 435 (2.3.5) ,It is Recommended to use Creep Coefficient as 1.60 and Shrinkage Strain 0.0004.
3- Define Load Combination (Long Term) Case 3 (+1.0), Case 2 (+1.0) and Case 1 (-1.0).
I am looking for your helpful feedback in order to use the right method.
 
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