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TALL BUILDING DRAFT DESIGN. Joan Tresserras Pujol- Xicoy. 1. Section dimensions. Columns : 1 – 5 floors :. 1. Section dimensions. 5 – 10 floors : 11 – 15 floors : 16 – 20 floors : 21 – 25 floors : 26 – 30 floors : 31 – 35 floors :. 1. Section dimensions. Beams :

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tall building draft design

TALL BUILDINGDRAFT DESIGN

Joan Tresserras Pujol-Xicoy

1 section dimensions
1. Sectiondimensions
  • Columns:
    • 1 – 5 floors:
1 section dimensions1
1. Sectiondimensions
  • 5– 10 floors:
  • 11 – 15 floors:
  • 16 – 20 floors:
  • 21 – 25 floors:
  • 26 – 30 floors:
  • 31 – 35 floors:
slide7

3. Loading

  • Windloading:
  • Accordingtothechinesecode:
      • Returnperiod of 50 years Wp = 0,55KN/m2.
      • Returnperiod of 100 years Wp = 0,60KN/m2
  • Buildingsituated in Tianjin, China  Roughnesstype C
  • WhenusingtheprogramwechoosetheChinese 2002 code
slide8

3. Loading

  • Earthquakeloading:
  • Designwith a basicfortificationintensity of 7.
  • In consequence a groundacceleration of 0,15gisused.
  • Siteclassificationis a site-class IV.
  • WhenusingtheprogramwechoosetheChinese 2002 code.
slide9

3. Loading

  • Dead load:
  • Automaticallycalculatedtheprogram (SelfWeightMultiplier = 1).
  • Itisnecessarytoadddead load totheslabsinsidetheshearwallareas, duetotheirverysmallthickness. Theseslabshelpto transfer lateral stresses.
      • Add a dead load = 7,5kN/
slide10

3. Loading

  • Liveload:
  • Followingthechinesecode:
slide11

4. Materials

Basically, the material usedwill be concrete. Default concrete givenby ETABS is a C40 concrete. Forstructuralreasons a new concrete C60 will be created.

Steel onlyused in thereinforcementbars.

slide12

5. Modelelaboration

A 3-D gridwithalltheelevation and plan dimensionsinputedhas to be created.

slide13

5. Modelelaboration

Itisconvenienttocreate a new set of columnsevery 5 storiestomakeiteasywhendimensioningthem.

In thefirst 4 floorsthecolumnsthatdon’thavefloorson top willalso be differentthantheoneswith 35 floorson top

slide14

5. Modelelaboration

  • Whendrawingshearwallsit’spossibletodistinguishintotwokinds of shearwalls:
    • Theonessurroundingtheelevators and stairs.
    • In theresidentialfloors, theonesdividingthedifferentapartments.
slide15

5. Modelelaboration

  • There are twokinds of beams:
      • Primarybeamsthatgofromcolumntocolumn. Themomentreleaseforthiskind of beamswill be continuous.
      • Secundarybeamsthatgofrombeamtobeam. Thechosendistributionforthistype of beamsis a crossdistribution. Themomentreleaseforthiskind of beamswill be pinned.
  • No beamsshould be drawninsidetheshearwalls.
slide17

5. Modelelaboration

Twokinds of slabs: 1.Normal slabs ;2.Inside shearwallsslabs

slide19

6. Modelanalysis

  • Threerequirementsshould be metbythemodel:
    • First rotation period / x or y period < 0,9
    • Story drift < 1/800
    • Maximum story drift / average story drift < 1,4
  • Tomeetthisthreerequirements a process of analysis and laterdimensioning of thestructuralmemberswilltake place.
  • Itwill be necessaryto look at thedifferentmodes of structureto determine whichoneisthefirsttohaverotation.
slide20

6. Modelanalysis

3rd mode

1st mode

2nd mode

slide21

6. Modelanalysis

Deformedshape

3-D View Longitudinal Reinforcing

slide23

7. Requirements

  • First rotation period / x or y period < 0,9

The first rotation period is the one of the third mode = 1,85398

The first period with x or y movement is the first mode = 2,50081

1,85398 / 2,50081 = 0,741352 < 0,9

  • Story drift < 1/800

The maximum story drift is for the 35th floor:

1/811 < 1/800

  • Maximum story drift / average story drift < 1,4

The maximum story drift is for the 1st floor= 1/811

Average story drift = 9,5992*10^(-4)

(1/811) / (9,5992*10^(-4)) = 1,285 < 1,4

slide24

THANK YOU!

谢谢!