TALL BUILDING DRAFT DESIGN

1. TALL BUILDINGDRAFT DESIGN Joan Tresserras Pujol-Xicoy

2. 1. Sectiondimensions • Columns: • 1 – 5 floors:

3. 1. Sectiondimensions • 5– 10 floors: • 11 – 15 floors: • 16 – 20 floors: • 21 – 25 floors: • 26 – 30 floors: • 31 – 35 floors:

4. 1. Sectiondimensions • Beams: • Slabs:

5. 2. Designrequirements

6. 2. Designrequirements

7. 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

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

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

10. 3. Loading • Liveload: • Followingthechinesecode:

11. 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.

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

13. 5. Modelelaboration Itisconvenienttocreate a new set of columnsevery 5 storiestomakeiteasywhendimensioningthem. In thefirst 4 floorsthecolumnsthatdon’thavefloorson top willalso be differentthantheoneswith 35 floorson top

14. 5. Modelelaboration • Whendrawingshearwallsit’spossibletodistinguishintotwokinds of shearwalls: • Theonessurroundingtheelevators and stairs. • In theresidentialfloors, theonesdividingthedifferentapartments.

15. 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.

17. 5. Modelelaboration Twokinds of slabs: 1.Normal slabs ;2.Inside shearwallsslabs

19. 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.

20. 6. Modelanalysis 3rd mode 1st mode 2nd mode

21. 6. Modelanalysis Deformedshape 3-D View Longitudinal Reinforcing

22. 6. Modelanalysis

23. 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

24. THANK YOU! 谢谢!