This document discusses a case study of the Pragati Towers residential building in Mumbai, India that utilized prefabricated construction. The building used precast concrete panels for the walls from the 1st to 23rd floors that were constructed in a factory and transported to the construction site. Analysis of the building found that modeling the vertical joints between precast panels as either integrated joints that allow shear transfer, or discrete gaps that do not allow shear transfer, produced different structural behavior results. Prefabricated construction provided benefits such as quality control, reduced construction time, and environmental efficiencies.

1. PREFABRICATION -
CASESTUDY
Presented by
ABIRAMI G

2. PREFABTICATION
• Prefabrication is the practice of assembling components of a structure
in a factory or other manufacturing site and transporting complete
assemblies to the construction site where the structure is to be located
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3. PRECAST SYSTEM
 Bearing wall system
 Moment resisting frame system
 Dual system
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4. CASESTUDY – PRAGATI TOWERS
 Location: Bhoiwada, Mumbai
 Architectural Type: Residential Building
 Developer: Larsen and Toubro Ltd., (L&T)
 Construction Start: Jan 2013
 Construction End: 2016
 Floor Count: G+23
 Plan Dimension: 45.8m x 19.69m
 Height: 70m
 Foundation : Pile Foundation
 System Type:
 Ground And Terrace Floor: Conventional Type
 1 To 23 Floor : Precast Large Panel Wall Type
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5. PLAN VIEW
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6. STANDARDISATION
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7. QUALITY CONTROL
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8. CONNECTION
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9. HORIZONTAL JOINT
• A horizontal connection between panels transfers vertical stresses
due to gravity loads and any out-of-plane bending due to eccentricity
of the loads.
• The horizontal joint between panels at a floor level is made by
projecting dowel bars.
• Tie reinforcement overlapped with U-bars and L-bars are provided in
the slabs for slab-to-wall connection.
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10. VERTICAL JOINT
• The vertical joints are designed to transfer shear forces under lateral
loads
• The exterior wall panels along the shorter direction of the building,
which constitute the primary shear walls to resist the lateral forces, are
provided with six shear keys per storey height
• In interior wall joints, reduced number of reinforcement loops are
provided per storey height since the shear demand is less.
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11. COMPARITIVE STUDY OF VERTICAL
JOINT
• The vertical joints between the panels were modelled as two
extreme conditions as:
 Integrated model – shear transfer was assumed
 Discrete gap model – no shear transfer
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12. INTEGRATED MODEL DISCRETE GAP MODEL
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13. ANALYSIS RESULTS
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14. ANALYSIS RESULTS
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15. PREVENTION OF PROGRESSIVE
COLLAPSE
1. Internal ties
2. Peripheral ties
3. Vertical wall ties
4. Floor to wall ties
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16. INTERIORS
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17. ENVIRONMENTAL BENEFITS
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18. Thank You..!