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Rehabilitation of an existing reinforced concrete structure. Mohammad Yousuf AlMuhaideb 200620496 Ammar Abdulrahman Aljassmi 200620272 Mohammad Omar Nehaim200602604 Ahmed Almansouri200517330 Saeed Almashgouni 200411521. Project Code: CEM1-2 . Contents. Introduction

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Project Code: CEM1-2

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Rehabilitation of an existing reinforced concrete structure

Mohammad Yousuf AlMuhaideb 200620496

Ammar Abdulrahman Aljassmi 200620272

Mohammad Omar Nehaim200602604

Ahmed Almansouri200517330

Saeed Almashgouni200411521

Project Code: CEM1-2


Contents

  • Introduction

  • Slab & Beam Designs

  • Columns & Foundation Designs

  • Cost Analysis

  • Conclusion


Introduction

Ammar Aljassmi

The Aim

Problem Identification

Objectives

The Design Process

Design Selection


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


Problem Identification

  • Owners would like to add floors

  • Owners want to change purpose of buildings

  • Buildings age

  • Change in municipal laws and regulations


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


Existing

Proposed


Study the changes


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


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.


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


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.


Design Selection


Slab & Beam Designs

Mohammad Omar

GP I Results

Conventional Design

FRP Design

Application

Design Application


GP I Results (Beams)


GP I Results (Beams)


GP I Results (Slabs)


GP I Results (Slabs)


GP I Results (Slabs)


Conventional Design

  • To Find the Area of Steel Required for the Slabs:

  • (As) req. = calculated amount of steel

  • (As) act. = actual area of steel


FRP Design

  • For the Calculation of FRP sheets, two methods were used:

    • Manual or Hand Calculations

    • Using the “Lamella” Software Program


FRP Design

  • Hand calculations:


Conventional Design


FRP Design


Conventional Application

Step 1: Removing 70 mm of the concrete cover and Roughening the surface


Conventional Application

Step 2: Installing the steel anchors


Conventional Application

Step 3: Install the new amount of steel bars


Conventional Application

Step 4: Casting the new layer of the concrete


Conventional Design Details

Enlargement Of Beams


Conventional Design Details

Enlargement Of Beams


FRP Design Details


FRP Design Details


Column & Foundation Designs

Ahmad

Al mansouri

GP I Results

Conventional Design of Columns

FRP Design of Columns

Foundation Design

Foundation Details


GP I Results (Columns)


GP I Results (Columns)

Pu (Design) = (φ) (α) [0.85 fc’ (Ag - Ast) + fy.Ast]


GP I Results (Columns)


Conventional Design

  • Usually called Section Enlargement or Concrete Jacketing

  • Manual or hand calculation is the method used for design


Conventional Design


Preview


Conventional Design Details


Conventional Design Details


FRP Design Details

1 design specified for the 5 columns

5 layers of FRP sheet type 240 (300 g/m2)


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”.


Foundation Designs


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.


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”.


Foundation Design Details


Foundation Design Details


Cost and Time Analyses

Mohammed

Al Muhaideb

Cost Analysis

Time Analysis

Comparison Between the Alternatives


Cost Analysis

3 cost estimates

Rehabilitation

4 parts

Strengthening

Partial Demolition

Partial Construction

Construction of Additional Floors

  • Rehabilitation

    • CFRP

    • Conventional

  • Demolish and Rebuild


Rehabilitation Cost 1a


Rehabilitation Cost 1b


Rehabilitation Cost 2


Rehabilitation Cost 3


Rehabilitation Cost 4


Rehabilitation Total Cost


Demolish and Rebuild Cost


Time Analysis

What about time?

  • Time represents money

  • Time comparison variables

    • Rentable area = total area – services area

    • 70 % occupancy level

    • Yearly rent is AED 120 /m2

    • Rent is collected quarterly


Time is Money

18 months period

1 month intervals


Time is Money

5 years period

4 months intervals


Rehabilitation VS. Demolish and Rebuild


Rehabilitation VS. Demolish and Rebuild


Rehabilitation VS. Demolish and Rebuild


Conclusion

Saeed Almashgouni

Testing

Conclusion


Testing


Conclusion


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