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Structural Design of Reinforced Concrete Residential Building GP - II

U nited A rab E mirates U niversity College of Engineering Department of Civil and Environmental Engineering Industrial Training & Graduation Projects. Structural Design of Reinforced Concrete Residential Building GP - II. Supervised by : Dr. Khaled El- Sawy. Contents. - I ntroduction

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Structural Design of Reinforced Concrete Residential Building GP - II

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  1. United Arab Emirates UniversityCollege of Engineering Department of Civil and Environmental EngineeringIndustrial Training & Graduation Projects Structural Design of Reinforced Concrete Residential Building GP-II Supervised by : Dr. Khaled El-Sawy

  2. Contents • -Introduction • -Structural design of : • Slabs • Beams • Stairs • Columns • Tie-beams • Footing • -Environmental, Financial, and Social Impact • -Conclusion

  3. Nomenclature • .fc`Compressive strength of concrete = 28MPa • .fyYielding strength of steel = 420 MPa • .IgMoment of inertia • .AgArea gross • .IeEffective moment of inertia • .wuUltimate weight • .VuUltimate shear • .MuUltimate bending moment • .McrCracking moment • .IcrCracking moment of inertia • .KEffective length factor • .EcElasticity of concrete

  4. Introduction • The considered low-rise building consists of three blocks • The Majles and Kitchen were designed in GP-I • The Villa is designed in GP-II • The slabs, beams, columns, tie- beams, stairs and footings are structurally designed. • This structural design in project followed the ACI-318-02M code. • Prokon, AutoCAD and Excel sheets are used in the design.

  5. Introduction • Project area = 903 m2 • Each floor area of villa • Ground floor = 338 m2 • First floor = 261 m2 • Each floor consist of several bedrooms, sitting rooms, family hall • Kitchen in ground floor

  6. Structural design • What is structural design? It is finding concrete dimensions and reinforcing steel areas of each structural element with insurance of safety and serviceability of the member. • Before designing : • Type of the structural element (i.e., beam, column …etc) • The loads carried by the member • The architectural limitations on the member dimensions

  7. Structural design Figure 1: Architectural plan for ground floor. Figure 2: Architectural plan for first floor.

  8. Structural design elements Figure 3:Typical structural elements

  9. 5.2m 5.3m nb=22 nr=7 0.3m 0.43m Structural Design: Slabs • it is one way • blocks and solid part for R1:

  10. Dimensions in mm Block 160 160 160 420 420 60 300 200 380 380 200 Rib Structural Design: Slabs • Load Calculation Figure 4: Drawing for ribbed slab (R1)

  11. Structural Design: Slabs • Bending Moment for Simply Supported Rib R1 Length (m) Bending moment (kN.mm)

  12. Structural Design: Slabs • Steel Area R1 Area of steel is 252mm2 (2#13) Length (m) Steel Area (mm2) Figure 6: Required steel area for R1

  13. Structural Design: Slabs • Shear design for R1 Length (m) Shear Force (kN.mm) Figure 7: Shear diagram for R1

  14. Structural Design: Slabs • From PROKON software (Vu = 21.1 kN)

  15. Structural Design: Slabs • From PROKON software (Vu = 21.1 kN)

  16. 2#10 2#13 #10@150mm Structural Design: Slabs • Check Deflection for R1 • Simply supported beam • Minimum thickness of R1 = L/16 = 5.2/16=0.325 m • The actual thickness of R1= 0.36 m > 0.325 • It is acceptable • Steel Arrangement Figure 6: Final drawing for ribbed slab (R1)

  17. Wall 20cm Solid part Solid part 30cm Beam 20cm 30cm 20cm 20cm 350cm Structural Design : Beams • Beam : DB5

  18. Structural Design : Beams • Steel arrangement Figure 7: Drawing of DB5

  19. Structural Design : Stair • Slope of the stairs • Length of the stair • Thickness to control deflection Figure 8: The stair design.

  20. Structural Design : Stair • Load calculation for the stair

  21. Structural Design : Stair Length (m) Bending moment (kN.mm) Length (m) Area of steel (mm2)

  22. Stair structural design • From Prokon As=1270mm2 should be between As, min and As,max Asmin = 0.0033*1400*230=1062.6 mm2 • As,max= 0.02125*1400*230=6842.5 mm2 , Asmin < As< Asmax so we will use 7 bars diameter 16

  23. Stair structural design Length (m) V (kN) As (mm2/mm) Length (m)

  24. Structural Design : Stair • Shear design

  25. Structural Design : Stair Figure 9 The drawing for the stair.

  26. Structural Design : Columns • Column (C1)

  27. Structural Design : Columns • Column (C1) Figure 10 Effective length factor K

  28. Structural Design : Columns • Column (C1) Figure 11 Interaction Diagram

  29. Structural Design : Columns Figure 12: The drawing for the column C1.

  30. Structural Design : Tie-Beams • Tie-beam (TB1) • The longest tie beam is TB1 which has a length of 7m which was designed as the critical case. Then, compared with the minimum steel area and take the biggest area of steel:- • In practice, As,min should be greater than the area of steel in a column that can enough to resist at least 10% of the heavily loaded column load (maximum load is 968 kN) • In practice As,min> 0.5 % Aconcrete of tie beam x-sec

  31. Structural Design : Tie-Beams Length (m) M (kN.mm) Length (m) V (kN) Figure 13: Moment diagram and shear diagram for TB1.

  32. Structural Design : Tie-Beams • For TB1 , As=573 mm2 which is (3 # 16) and compare it with: 10% of the column load (maximum load is 968 kN) 1- As,min =(10% Pu) / (0.9 Fy) =0.1 968 1000 / 0.9 420 = 256 mm2 (2 # 13) All the tie beams have a cross-section 20cm x 60cm 2- As,min = 0.5 % Aconcrete= 0.005 200 600 = 600mm2 (3 # 16) So, the biggest area is 3 # 16. • For shear (stirrups):

  33. 0.95m 0.3m 2.2m 0.8m 0.6m 2.2m Structural Design : Footing • Footing (F1)

  34. Structural Design : Footing

  35. Structural Design : Footing

  36. 0.95m 0.3m 2.2m 0.8m 0.6m 2.2m Structural Design : Footing

  37. 0.95m 0.3m 2.2m 0.8m 0.6m 2.2m Structural Design : Footing

  38. Footingstructural design Figure 14: Interaction diagram

  39. 0.85m 0.4m 2.2m 12#16 12#16 Footingstructural design Figure 15: The drawing of the footing F1.

  40. Environmental Impact • Environmental The environmental aspects and impact of the project should be controlled by the involved parties to control the bad effects in both sides either by the environment on the building or on the other way. - here in UAE, the building usually consumes some of the country’s energy and water resources and this could be reduced by using green house technology where solar and wind energies can be used extensively. - Although the building material considered in this project (i.e., reinforced concrete) is relatively cheap compared to the steel material, it is, unfortunately, not environmental friendly

  41. Social Impact • Social Each building in this world represents a unique and creative idea that is made real by the cooperation of the involved design and construction parties. It is an event that starts by developing the owner ideas on the hands of engineers to achieve safety, serviceability and creativity of project. For example, as a social aspects, here in UAE, traditions and the cultural background of the people is totally different from the western countries. That’s should be achieved by the architectural design to represent the cultural identity in the scope of the project design beside the modernity.

  42. Conclusions and recommendations Conclusion and recommendation • The experience gained in the design process is invaluable and represents a major stone in building an efficient structural designer engineer. • Finally, it is recommended that the design work achieved in this project is originally performed by two groups using two different structural systems. • This would provide information enough to compare the cost of each system and get experience with cheaper solutions.

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