Eng. Mamdouh Presentation

8/4/2019 Eng. Mamdouh Presentation

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THE LANDMARK ABU DHABI ALHABTOOR CCC JVSHORTENING PREDICTION

PREDICTION OF AXIAL SHORTENING


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April 09 THE LANDMARK ABU DHABI ALHABTOOR CCC JVSHORTENING PREDICTION 2

Introduction

This presentation is intended to

shed the light on the nature of

the Shortening criterion in concrete, themethod of prediction

and application of information.


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TYPES OF SHORTENING

Elastic shortening (instant)

Shrinkage

- Drying shrinkage (instant)- Autogenous shrinkage(time dependant).

Creep (time dependant)


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FACTORS AFFECTING SHORTENING

1 ELASTIC SHORTENING

Strength of concrete.

Age of loading.

Magnitude of loading


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2 SHRINKAGE

Ambient humidity.

Dimensions of element.

Composition of concrete.

SHRINKAGE DOES NOT DEPEND ON LOADING


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April 09THE LANDMARK ABU DHABI ALHABTOOR CCC JV

SHORTENING PREDICTION 6


3 CREEP

Ambient humidity.

Dimensions of element. Composition of concrete.

Strength of concrete.

Magnitude of sustained load.

Age of loading.

CREEP IS DEPENDANT ON SUSTAINED LOADING


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MONITORED OBJECTS

Shortening is being predicted

and monitored for all VerticalStructural Elements,

That is:

COLUMNSand

COREWALL ELEMENTS


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LETS LOOK AGAIN AT THAT LAST IMAGE.

Long term Shortening yet to take place AFTER PLACEMENT is the key figure

to assess impact.


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LONG TERM SHORTENING YET TO TAKE PLACE AFTER PLACEMENT

Long term Cumulative shortening for a column atlevel 30, starts well before placement date.

Long term cumulative shortening yet to take placeat that point equals:

Long term cumulative shortening at that point LESSInterim Cumulative Shortening that has alreadytaken place at time of pouring the slab.


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WE NEED TO AGREE ON THE DEFINITION OF THE TERMS

JUST MENTIONED:

Final floor Shortening: FFSIs the final (30+ years) shortening for a VSE at a given level.

Final Cumulative Shortening FCS:Is the final (30 + years) and cumulative shortening for all the VSEsunderneath a point at a given level.

Interim Cumulative Shortening ICS:Is the cumulative shortening for all the VSEs underneath a TargetPoint at a given time.


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MORE DEFINITIONS

LEVEL ADJUSTMENT:

Floor slab should be constructed to a higher level than that designedsuch that design level would be reached to upon completion of finalshortening.

Adjustment at a given level should be equal to the Cumulative

Shortening yet to take place for all columns underneath that levelfrom the date of slab placement and for 30 years to come afterloading completion.

Level Adjustment = Final (30 Y) Cumulative Shortening at the point lessthe Interim Cumulative Shortening at time of placement = FCS ICS.


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WHY DO WE NEED TO PREDICT SHORTENING ?.

To determine the level adjustment amount.

To assess the impact on interfacing structures.

To establish construction tolerance in interfacing

installations (cladding, pipe risers, vertical railing ..etc).

To assess the impact of column / core wall differentialshortening on the structure.


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CALCULATION METHODOLOGY

The magnitude of long term elastic,shrinkage and creep strains has been

calculated as per the provisions of BS EN

1992-1-1:2004.


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PREDICTION METHODOLOGY 1 - ANALYSIS PARAMETERS

SHORTENING CALCULATIONS TO THE REQUIREMENTS OF "EUROCODE 2, BS EN 1992-1-1:2004

RH Relative Humidity % age

HA coefficient depending on the relative

1.5[1+(.012 RH)18] ho + 250 3 , 35

t0 Age of concrete at loading

c Compressive stress applied at age to

ho Section notional size = 2 Area / Perimeter

t Age of concrete at the moment)

t-t0 Non-adjusted duration of loading

cc(t)Cefficient for the calculation of

exp{s[1-(28/t)1/2]} = e{s[1-(28/t)]}

compressive strength fcm(t) at age t

fcm(t) Compressive strength at age t cc(t). fcm

Ecm Concrete secant modulus of elasticity 22 (fcm/10)0.3

Ecm(t) Tangent Modulus of Elasticity at age "t" [fcm(t) / fcm]0.3 .Ecm


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PREDICTION METHODOLOGY 2 - ELASTIC SHORTENING

et Elastic strain at time "t" c / Ecm(t)


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April 09

THE LANDMARK ABU DHABI ALHABTOOR CCC JVSHORTENING PREDICTION 17

PREDICTION METHODOLOGY 3 - DRYING SHRINKAGE

RHCoefficient related to relative

humidity1.55 [1 - (RH/RH

O)3]

ds1 Coefficient depends on cement type

ds2 Coefficient depends on cement type

cd.0 Basic drying shrinkage strain0.85[(220+110.ds1).

exp(-ds2.fcm/fcmo)].RH/10

6

ds(t,ts)(t-t

s)

(t-ts)+0.04

ho3

kh Coefficient depending on "ho" Equals 0.7 for ho =>500

cd (t) Long term drying shrinkage ds(t,ts).kh.cd.0ca () 2.5(fck-10)10

6

as(t) 1 - exp(-2t0.5)ca (t) The autogenous shrinkage as(t) . ca ()

cs Total shrinkage strain cd +ca


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April 09


PREDICTION METHODOLOGY 4 - CREEP

Ec Tangent Modulus of Elasticity. 1.05 Ecm

1 12,3 are coefficients to (35/fcm)0.7

2 consider the influence of the (35/fcm

)0.2

3 concrete strength on the creep strain. (35/fcm

)0.5

(to) A factor allowing for age of loading effect. 1 / (0.1 + to0.2)

(fcm)A factor to allow for the effect of concrete 16.8

strength on the notional creep coefficient fcm

(t,to) A coefficient to count time effect [(t-t0) / (H + t - t0)]0.3

RH A factor to allow for the effect of humidity. [1+(1-RH/100).1/(0.1 ho^0.333)].2

0 Notional creep coefficient RH . (fcm). ((t0)

t,to The creep coefficient. . c(t,to)

cct,to Creep deformation (strain) at time "t" t,tocEc


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April 09


THE MASTER SPREADSHEET

Data base for geometric, material and loading information for eachcolumn / corewall element, including the construction schedule,

has been entered into a Master Spreadsheet.

Cells of the Master Spreadsheet encapsulate the formulae needed tocalculate the strain in the column corresponding to followingloadings imposed by floor slabs supported by the column:

SWL : Self Weight Load.

SDL : Super-imposed Dead Load.

SLL : Super-imposed Live Load.


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April 09


MASTER SPREAD SHEET - INSERTING CONSTRUCTION SCHEDULE


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April 09

THE LANDMARK ABU DHABI ALHABTOOR CCC JV


MASTER SPREAD SHEET - INSERTING COLUMN PROPERTIES


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April 09



MASTER SPREAD SHEET PART 1


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April 09



MASTER SPREAD SHEET PART 2

DETAIL A


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April 09



MASTER SPREAD SHEET DETAIL A


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April 09



MASTER SPREAD SHEET GETTING A SHORTENING VALUE ON A GIVEN DATE


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April 09




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April 09



LEVEL ADJUSTMENT ACHIEVED

To determine the level

adjustment amount.


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April 09



MASTER SPREAD SHEET GETTING A COLUMN PROFILE AT A GIVEN LEVEL

PREDICTED PROFILE FOR C1- L 30 TOP

-60.00

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

28-Jan-08

28-Feb-08

28-Mar-08

28-Apr-08

28-May-08

28-Jun-08

28-Jul-08

28-Aug-08

28-Sep-08

28-Oct-08

28-Nov-08

28-Dec-08

28-Jan-09

28-Feb-09

28-Mar-09

28-Apr-09

28-May-09

28-Jun-09

28-Jul-09

28-Aug-09

28-Sep-09

28-Oct-09

28-Nov-09

28-Dec-09

28-Jan-10

28-Feb-10

28-Mar-10

28-Apr-10

28-May-10

PREDICTED

FINALMEASURED

CHART NO. C3-L30-04009-01 COLUMN C3 POINT AT L 30 DATE 3-Jun-08

A

MAS

PROFILE AT L-1


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April09

TH

ELANDMARK

ABU

DHABI

ALHABTOOR

CCC

JV

SHO

RTENINGPRE

DICTION

TERSPRE

ADSHEETIMP

ACTOFSHORTE

NINGONINTERFACINGSTRUCTURES(THEC

-70.00

-60.00

-50.00

-40.00

-30.00

-20.00

-10.00

0.00

9-Feb-08

9-Mar-08

9-Apr-08

9-May-08

9-Jun-08

9-Jul-08

9-Aug-08

9-Sep-08

9-Oct-08

9-Nov-08

9-Dec-08

9-Jan-09

9-Feb-09

9-Mar-09

9-Apr-09

9-May-09

9-Jun-09

9-Jul-09

9-Aug-09

9-Sep-09

9-Oct-09

9-Nov-09

9-Dec-09

9-Jan-10

9-Feb-10

9-Mar-10

9-Apr-10

-140.00

-120.00

-100.00

-80.00

-60.00

-40.00

-20.00

0.00

26-Apr-08

26-May-08

26-Jun-08

26-Jul-08

26-Aug-08

26-Sep-08

26-Oct-08

26-Nov-08

26-Dec-08

26-Jan-09

26-Feb-09

26-Mar-09

26-Apr-09

26-May-09

26-Jun-09

26-Jul-09

26-Aug-09

26-Sep-09

26-Oct-09

26-Nov-09

26-Dec-09

26-Jan-10

26-Feb-10

26-Mar-10

26-Apr-10

A B

PROFILE AT L-7

INTERFACING

STRUCTURE

LONG

TERMDIMENSIO

NALCHANGE

H=AB

=4.9mm

INTERFACING

INSTALLATION

14APR


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April 09



IMPACT ON INTERFACING STRUCTURES ASSESSED.

To determine the level adjustmentamount.

To assess the impact on interfacingstructures.

A

MASTPROFILE AT L-36 PROFILE AT L-35


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April09

TH

ELANDMARK

ABU

DHABI

ALHABTOOR

CCC

JV

SHO

RTENINGPRE

DICTION

TERSPRE

ADSHEETIMP

ACTOFSHORTE

NINGONINTERF

ACINGINSTALLATIONS(CUR

-300.00

-250.00

-200.00

-150.00

-100.00

-50.00

0.00

4-Dec-08

4-Jan-09

4-Feb-09

4-Mar-09

4-Apr-09

4-May-09

4-Jun-09

4-Jul-09

4-Aug-09

4-Sep-09

4-Oct-09

4-Nov-09

4-Dec-09

4-Jan-10

4-Feb-10

4-Mar-10

4-Apr-10

4-May-10

4-Jun-10

4-Jul-10

4-Aug-10

4-Sep-10

4-Oct-10

4-Nov-10

A

B

INTERFACING

STRUCTURE

LONG

TERMDIMENSIO

NALCHANGE

H=AB

=2.1mm

INTERFACING

INSTALL

ATION

COMPLETION

20APRIL2010

-350.00

-300.00

-250.00

-200.00

-150.00

-100.00

-50.00

0.00

24-Dec-08

24-Jan-09

24-Feb-09

24-Mar-09

24-Apr-09

24-May-09

24-Jun-09

24-Jul-09

24-Aug-09

24-Sep-09

24-Oct-09

24-Nov-09

24-Dec-09

24-Jan-10

24-Feb-10

24-Mar-10

24-Apr-10

24-May-10

24-Jun-10

24-Jul-10

24-Aug-10

24-Sep-10

24-Oct-10

A


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April 09



CONSTRUCTION TOLERANCE IN INTERFACING INSTALLATION VERIFIED



To establish construction tolerancein interfacing installations (cladding,pipe risers, vertical railing ..etc) .


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April 09



THE EXECUTIVE SUMMARY

Information extracted from various Master Spreadsheets has

been classified sorted in 5 schedules A through E.

These schedules were listed in an Implementation Duty

Matrix along with a listing for their

functions and concerned parties.


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April 09




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SCHEDULE A

A summary for30 years final

cumulative

shortening


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SCHEDULE B

Balance Final

CumulativeShortening yet

to take place

after placement

of VSEs


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SCHEDULE

C

Change in

inter-floor

height


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SCHEDULE D

Floor level

adjustment


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SCHEDULE E

Differential

shorteningbetween

corewall &

columns at

pivots.


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COLUMN / COREWALL DIFFERENTIAL SHORTENING COMPUTED.



To establish construction tolerance ininterfacing installations (cladding, piperisers, vertical railing ..etc) .

To assess the impact of column /core wall differential shortening onthe structure.


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THIS IS THE END OF THE PRESENTATION

Thank you very much for listening..

I shall be ready for your question after

viewing a Master Spreadsheet.

M.H.

Eng. Mamdouh Presentation

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