DOCUMENT No CALCULATIONS MU000749 OFFICE PROJECT TITLE Manila Office KAFD_Hotel_Plot_1.08 SUBJECT SHEET No ISSUE AUTHOR DATE CHECKED BY DATE APPROVED BY DATE C 1 RJB/GB 03/30/00 IF 06/12/22 RB 06/12/22 2 3 4 5 SUPERSEDES DOC No DATE 1.0 Design Methodology PROKON (Continuos Beam Module Ver. 2.4.13) - applicable only to one way spanning reinf SAFE 12.2.0 - applicable to any type of reinforced concrete slab TOTAL SHEETS DESIGN BASIS STATEMENT (Inc. sources of info/data, assumptions made, standards, etc.) This slab deflection verification has been done to ensure that the version's of PROKON (Continuos Beam Module Ver. 2.4.13 and SAFE 12.2.0, Manila Office is curre using is giving acceptable result. A manual calculation has been done based from the method as per ACI-318 and BS811 Part2 and compared it to the result of PROKON (Continuos Beam Module Ver. 2.4.13 a SAFE 12.2.0) With this, it has been found out that both SAFE 12.2.0 and PROKON giv the same result with manual calculation in terms of flexural reinforcement and deflection. SAFE 12.2.0 uses the provision of ACI 318 in terms of calculating the effective moment of inertia,however uses ACI435 in calculating modulus of rupture concrete no manner what design code has been specified in the preferences either u British Standard, Austrailian Standard, etc. while PROKON longterm deflection is based from BS8110 Part 2 . Likewise in terms of ULS (flexural required reinforceme PROKON, SAFE12.2.0 and Manual Check gives the almost the same results. 2.0 Parameters used u = 45 N/mm 2 (BS CODE 8110) ' = 55 N/mm 2 (ACI - 318) = 29000 N/mm 2 (BS CODE 8110) = 34856 N/mm 2 ( ACI - 318) = 2946 mm 2 Tension reinforcement an = 10m (simply supported) ction = 1000 x 350 (bxd) L = 5.00 kN/m = 3.0 kN/m it Weigth = 25 kN/m 3 eep coefficient = 2.0 ee shrinkage strain = 3.00E - 04 me - dependent factor for sustained load, = 2.0 (5 years or more)
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DOCUMENT No
CALCULATIONS MU000749
OFFICE PROJECT TITLE
Manila Office KAFD_Hotel_Plot_1.08
SUBJECT SHEET No
ISSUE AUTHOR DATE CHECKED BY DATE DATE COMMENTS
1 RJB/GB 03/30/00 IF 04/21/23 RB 04/21/232
3
4
5
SUPERSEDES DOC No DATE
1.0 Design Methodology
PROKON (Continuos Beam Module Ver. 2.4.13) - applicable only to one way spanning reinforced concrete slab
SAFE 12.2.0 - applicable to any type of reinforced concrete slab
This slab deflection verification has been done to ensure that the version's of PROKON (Continuos Beam Module Ver. 2.4.13 and SAFE 12.2.0, Manila Office is currently using is giving acceptable result.
A manual calculation has been done based from the method as per ACI-318 and BS8110 Part2 and compared it to the result of PROKON (Continuos Beam Module Ver. 2.4.13 and SAFE 12.2.0) With this, it has been found out that both SAFE 12.2.0 and PROKON gives the same result with manual calculation in terms of flexural reinforcement and deflection. SAFE 12.2.0 uses the provision of ACI 318 in terms of calculating the effective moment of inertia,however uses ACI435 in calculating modulus of rupture of concrete no manner what design code has been specified in the preferences either using British Standard, Austrailian Standard, etc. while PROKON longterm deflection is based from BS8110 Part 2 . Likewise in terms of ULS (flexural required reinforcement) PROKON, SAFE12.2.0 and Manual Check gives the almost the same results.
creep coefficient = 2.0 free shrinkage strain = 3.00E - 04Time - dependent factor for sustained load, = 2.0 (5 years or more)
DOCUMENT No SHEET
MU000749
SUBJECTPROKON and SAFE 12.2.0 - long term deflection verification
SUBJECT CALCULATIONS OUTPUT
SummaryMETHOD Total long Term Deflection CODE
Manual Check 89.53 0.62fr(ACI-318)
Manual Check 89.77 BS 8110-1997
Prokon W 2.4.13 84.62 ACI-318
Prokon W 2.4.13 89.84 BS 8110-1997
RAPT 6.2.2 81 ACI-318 -fr (N/A)
RAPT 6.2.2 89.1 BS 8110-1997 - fr (N/A)
SAFE 12.2.0 54.13 0.62fr(ACI-318)
SAFE 12.2.0 85.89 0.33fr(ACI-435)
SAFE 12.2.0 82.94 0.62fr(BS 8110-1997)
SAFE 12.2.0 82.94 0.33fr(BS 8110-1997)
Recommendation (when using SAFE 12.2.0)
1.0 When using British Standard please note that we are using fcu, and the modulus of rupture the program uses fc'. The relation between the cube strength is, fc' = 0.8 fcu
2.0 To resolved the scenario of the problem above, instead of allowing the software to calculate the modulus of rupture, go to main menu select run, then cracking analysis option and select user define, and input the calculated modulus of rupture using the equation 0.33√(0.8Fcu).
3.0 In the first iteration used reinforcement based from finite element design, however if locatized areas have significant deflection, re run the model again by using quick tension rebar specification to minimized the deflection, but take note that this deflection are only true in the areas where reinforcement specified have been provided in the actual design.
4.0 Deflection should be based from load case sequencing as detail in the appendix "A" in this report.
Conclusion:
SAFE 12.2.0, underestimate the long term deflection to the fact that it is using a modulus rupture of concrete based from ACI-318 which is 0.62 √fc' and this parameter can not be controlled by the user as it is internally calculated by the program.
ACI-435 stated that using fr = 0.62 √fc' underestimate the calculated long term deflection, in that case it is advised to used fr=0.33 √fc', which produced good correlation between the calculated deflection and the reported field deflection.
See appendix B and C for detail verification.
DOCUMENT No SHEET
MU000749
SUBJECTPROKON and SAFE 12.2.0 - long term deflection verification
SUBJECT CALCULATIONS OUTPUT
Appendix A
- Load Case Sequencing when checking longterm deflection
Dead , Nonlinear(Long Term Cracked) with creep and shinkage, start from unstressed conditionSDL, Nonlinear(Long Term Cracked) with creep and shinkage, start from stressed state Dead
LL, Nonlinear (Cracked) , start from stressed state SDL
The study of deflection between two softwares have been conducted in one way spanning member. All parameters shown below were used in both software however some values that are not mentioned here the default values on each software has been adopted.
2.0 Parameters used
Concrete Material PropertyFc' = 30 N/mm2 for slabsFc' = 40 N/mm2 for wallsEc = 29000 N/mm2 Ec = 31000 N/mm2
