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Project Code: CEM1-2

Rehabilitation of an existing reinforced concrete structure. Mohammad Yousuf AlMuhaideb 200620496 Ammar Abdulrahman Aljassmi 200620272 Mohammad Omar Nehaim 200602604 Ahmed Almansouri 200517330 Saeed Almashgouni 200411521. Project Code: CEM1-2 . Contents. Introduction

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Project Code: CEM1-2

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  1. Rehabilitation of an existing reinforced concrete structure Mohammad Yousuf AlMuhaideb 200620496 Ammar Abdulrahman Aljassmi 200620272 Mohammad Omar Nehaim 200602604 Ahmed Almansouri 200517330 Saeed Almashgouni 200411521 Project Code: CEM1-2

  2. Contents • Introduction • Slab & Beam Designs • Columns & Foundation Designs • Cost Analysis • Conclusion

  3. Introduction Ammar Aljassmi The Aim Problem Identification Objectives The Design Process Design Selection

  4. The Aim • To study an existing building need to be rehabilitated • To learn the different techniques of rehabilitation • To understand the design of rehabilitated elements

  5. Problem Identification • Owners would like to add floors • Owners want to change purpose of buildings • Buildings age • Change in municipal laws and regulations

  6. Problem Identification • Existing residential building consists of two floors • The owner would like to: • increase the number of floors to 4 Floors • change it from residential to office building

  7. Existing Proposed

  8. Study the changes

  9. Objectives • Study the different solutions: • Rehabilitation of the building • Demolish and rebuild the structure • Suggest to the owner the advantages and disadvantages of each solution in terms of: • Cost • Time

  10. Demolish and Rebuild Rehabilitation Objectives • Demolishing existing building • Construction of new building • 4 floors • Foundation • Strengthening • Partial demolishing and construction of few elements • Construction of additional floors VS.

  11. Objectives To accomplish the objectives; 5 main sub-objectives were set to be done in GP II: • Testing of columns • Analysis of tested columns • Method of rehabilitation to be used • Design strengthening of the elements • Decision evaluation

  12. The Design Process • Identify actual loads acting on structure before applying new changes. • Calculate the load carrying capacity of each existing element. • Calculate the loads that would occur after applying the new changes. • New designs are to be made for the elements that need strengthening.

  13. Design Selection

  14. Slab & Beam Designs Mohammad Omar GP I Results Conventional Design FRP Design Application Design Application

  15. GP I Results (Beams)

  16. GP I Results (Beams)

  17. GP I Results (Slabs)

  18. GP I Results (Slabs)

  19. GP I Results (Slabs)

  20. Conventional Design • To Find the Area of Steel Required for the Slabs: • (As) req. = calculated amount of steel • (As) act. = actual area of steel

  21. FRP Design • For the Calculation of FRP sheets, two methods were used: • Manual or Hand Calculations • Using the “Lamella” Software Program

  22. FRP Design • Hand calculations:

  23. Conventional Design

  24. FRP Design

  25. Conventional Application Step 1: Removing 70 mm of the concrete cover and Roughening the surface

  26. Conventional Application Step 2: Installing the steel anchors

  27. Conventional Application Step 3: Install the new amount of steel bars

  28. Conventional Application Step 4: Casting the new layer of the concrete

  29. Conventional Design Details Enlargement Of Beams

  30. Conventional Design Details Enlargement Of Beams

  31. FRP Design Details

  32. FRP Design Details

  33. Column & Foundation Designs Ahmad Al mansouri GP I Results Conventional Design of Columns FRP Design of Columns Foundation Design Foundation Details

  34. GP I Results (Columns)

  35. GP I Results (Columns) Pu (Design) = (φ) (α) [0.85 fc’ (Ag - Ast) + fy.Ast]

  36. GP I Results (Columns)

  37. Conventional Design • Usually called Section Enlargement or Concrete Jacketing • Manual or hand calculation is the method used for design

  38. Conventional Design

  39. Preview

  40. Conventional Design Details

  41. Conventional Design Details

  42. FRP Design Details 1 design specified for the 5 columns 5 layers of FRP sheet type 240 (300 g/m2)

  43. Foundation Designs • Step 1: A calculation of the total load that comes from the columns for each strip, the dimensions for each strip is found as well. • Step 2: The stresses coming from each strip footing are then calculated. • Step 3: The stresses are then compared with bearing capacity of soil, if the stress of footing greater than the bearing capacity of the soil then the footing is considered to be “Unsafe”.

  44. Foundation Designs

  45. Foundation Strengthening Design • Step 1: Find new width of footing after the increased load by using this equation: • Step 2: Find the Area of the new required steel reinforcement.

  46. Foundation Strengthening Design The Area of steel required (678.7) is smaller than the existing Area of steel (769.7) which means that the footing is considered “Safe”.

  47. Foundation Design Details

  48. Foundation Design Details

  49. Cost and Time Analyses Mohammed Al Muhaideb Cost Analysis Time Analysis Comparison Between the Alternatives

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