structural rehabilitation of buildings - national concrete … · 2017-11-16 · structural...
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Structural Rehabilitation of Buildings
Satish Jain Consulting Engineers Pvt. Ltd. 1
Satish JainIowa State University
President, Satish Jain Consulting Engineers (INDIA)
Iowa Better Concrete Conference-2017
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• Structural Deterioration:Dilapidated buildings due to loss of mechanical
properties of members due to durability and age
related issues.
• Structural Upgradation:Strengthening/stiffening required due to additions or
change of use or function of the building or due to
seismic enhancement to the existing structure.
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• Strength
• Durability
• Seismic/Lateral Force Resistance
• Fire Resistance
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Image Courtesy: General Technologies Inc.
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Image Courtesy: https://theconstructor.org.
Image Courtesy: Tarek Alkhrdaji
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Image Courtesy: Tarek Alkhrdaji and Jay Thomas.
Image Courtesy: VSL Structural Technologies
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The Executive Tower of Mexico's Ministry of Economy, showing retrofitted bracing, incorporating RESTON®SA shock absorbers, in each face of the building
Image Courtesy: Mageba Group.
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Ultra High Performance Concrete
Satish Jain Consulting Engineers Pvt. Ltd. 11Image Courtesy: Zach Haber, Genex
Systems/FHWA TFHRC
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Highly Packed UHPC Mix
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Systems/FHWA TFHRC
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• Compressive Strength : > 150 MPa ( 21.75 ksi)
• Tensile Strength: Over 2 times greater than Concrete
• Highly Ductile: Post Cracking Ductility
• Chloride Ion Permeability: 1/10 to 1/50 of Concrete
• Better Freeze-Thaw characteristics
• Fracture Energy: 100 times of Concrete
Ultra Durable Hence Ultra High Performance
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• Cost Effectiveness:
• Downsizing Dimensions and Sections
• Reduction in Steel Reinforcement
• Sustainability:
• Green Construction
• Minimized Maintenance due to superior durability
• Encourage use of recycled materials
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• Original Design:
• Ground + 3 Podium levels + 10 Residential Levels
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• After Construction of Foundation:
• Ground + 3 Podium levels + 15 Residential Levels
• Challenge:
Match gravity load
Match earthquake forces/over-turning moments
Made possible by changing the residential levels to
UHPC Slabs
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• UHPC Waffle Deck from Wapello County Bridge
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• Use of thinner precast/prestressed UHPC Columns could
create more usable area. Designed to be displacement
compatible but with no moment taking capacity at ends.
• La Republique Bridge – France (UHPC Piers and Girders)
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• Use of UHPC to strengthen corroded steel beams
• Application: Structural Steel Parking Garages
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• Use of UHPC layer on top of
exposed concrete floors or
cover concrete could help
reduce the maintenance cycle
several folds.Image Courtesy: Ductal Website
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• Use of UHPC layer on top to increase negative bending
moment capacity of slabs and beams
• Small development lengths: 6 to 10 times the bar diameter
Courtesy: Prof. Eugen Bruhwiler
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UHPC Jacketing
Satish Jain Consulting Engineers Pvt. Ltd. 21Image Courtesy: Ductal Website
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Courtesy: Mitsuo Ozawa, Hiroaki Morimoto
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Image Courtesy: Sub Bei, Lin Zhixiang
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Rehabilitation of Joints using UHPC
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Thank You!
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Iowa Better Concrete Conference-2017