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 04/18/23 RB 04/18/232

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

TOTAL SHEETS

APPROVED BY

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 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.

2.0 Parameters used

Fcu = 45 N/mm2 (BS CODE 8110)Fc' = 55 N/mm2 (ACI - 318)Ec = 29000 N/mm2 (BS CODE 8110)Ec = 34856 N/mm2 (ACI - 318)As = 2946 mm2 Tension reinforcementspan = 10m (simply supported)Section = 1000 x 350 (bxd)SDL = 5.00 kN/mLL = 3.0 kN/m Unit Weigth = 25 kN/m3

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

NOTE:

For

DOCUMENT No SHEET

MU000749 OF

SUBJECTSAFE - long term deflection

SUBJECT CALCULATIONS

APPENDIX B: SAFE 12.2.0

ACI 318

fr = 0.62(fc')^0.5

fr = 0.33(fc')^0.5

54 mm

85.89 mm

SHEET

SAFE - long term deflection

OUTPUT

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DOCUMENT No SHEET

MU000749 OF

SUBJECTManual - long term deflection

SUBJECT CALCULATIONS OUTPUT

APPENDIX C

gerry

DOCUMENT No SHEET

MU000749 OF

SUBJECTManual - long term deflection