Retrofit Measures for Substructure Components

siennatearfulUrban and Civil

Nov 25, 2013 (3 years and 4 months ago)

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Retrofit Measures for
Substructure Components

Presented by Richard V. Nutt

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Components to be Retrofitted


Piers and Columns


Cap Beams and Column to Cap Beam
Joints

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Components to be Retrofitted


Piers and Columns


Cap Beams and Column to Cap Beam
Joints

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Pier and Column Retrofitting


Reinforced Concrete Columns


Steel Columns, Frames and Compression
Members


Concrete Pier Walls

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Pier and Column Retrofitting


Reinforced Concrete Columns


Steel Columns, Frames and Compression
Members


Concrete Pier Walls

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Reinforced Concrete Columns


Column Replacement


Flexural Strengthening


Ductility Improvement and Shear
Strengthening


Supplemental Shear Walls


Preservation of Vertical Load Capacity


Limitation of Column Forces

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Column Replacement



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Column Replacement


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Column Replacement


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Column Anchorage


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Replaceable Plastic Hinge


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Replaceable Plastic Hinge


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Supplemental Column


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Reinforced Concrete Columns


Column Replacement


Flexural Strengthening


Ductility Improvement and Shear
Strengthening


Supplemental Shear Walls


Preservation of Vertical Load Capacity


Limitation of Column Forces

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Concrete Overlay


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Column Strengthening


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Column Strengthening


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Column Strengthening



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Reinforced Concrete Columns


Column Replacement


Flexural Strengthening


Ductility Improvement and Shear
Strengthening


Supplemental Shear Walls


Preservation of Vertical Load Capacity


Limitation of Column Forces

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Typical Steel Shell


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Shell for Rectangular Column


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Composit Fiber Properties


Type of Fiber

Ultimate
Strength,

MPa (ksi)

Ultimate

Strain

Modulus of Elasticity,

GPa (ksi)

E
-
Glass

2410 (350)

0.020

41 (6,000)

S
-
Glass

3450 (500)

0.030

41 (6,000)

CF
-
Pan

4140 (600)

0.020

228

345 (33,000

50,000)

C
-
Pitch
-
GP

1380 (200)

0.003

41 (6,0
00)

Pitch UHM

2760 (400)

0.005

483

827 (70,000

120,000)

Aramid

3450 (500)

0.020

69

138 (10,000

20,000)

Ceramic

690 (100)

0.020

69

276 (10,000

40,000)

Nylon

345 (50)

0.050

0.500

3.5 (500)


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Anchorage for Prestress Strand


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Prestress Wrap Using Wedges


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Semi
-
circular Reinforcing Bars


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Semi
-
circular Reinforcing Bars


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Semi
-
circular Reinforcing Bars


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Reinforced Concrete Columns


Column Replacement


Flexural Strengthening


Ductility Improvement and Shear
Strengthening


Supplemental Shear Walls


Preservation of Vertical Load Capacity


Limitation of Column Forces

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Infill Shear Wall


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Reinforced Concrete Columns


Column Replacement


Flexural Strengthening


Ductility Improvement and Shear
Strengthening


Supplemental Shear Walls


Preservation of Vertical Load Capacity


Limitation of Column Forces

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Verticle Capacity Preservation


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Reinforced Concrete Columns


Column Replacement


Flexural Strengthening


Ductility Improvement and Shear
Strengthening


Supplemental Shear Walls


Preservation of Vertical Load Capacity


Limitation of Column Forces

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Sierra Point Overhead


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Flexural Strength Reduction

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Pier and Column Retrofitting


Reinforced Concrete Columns


Steel Columns, Frames and Compression
Members


Concrete Pier Walls

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Steel Columns, Frames and
Compression Members


Braced Frames


Built
-
up Compression Members

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Braced Steel Bent Retrofit


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Braced Steel Bent Retrofit


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Steel Columns, Frames and
Compression Members


Braced Frames


Built
-
up Compression Members

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Steel Column Retrofit


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Steel Column Retrofit


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Steel Column Retrofit


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Pier and Column Retrofitting


Reinforced Concrete Columns


Steel Columns, Frames and Compression
Members


Concrete Pier Walls

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Pier Wall Retrofit


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Components to be Retrofitted


Piers and Columns


Cap Beams and Column to Cap Beam
Joints

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Bent Cap Configurations


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Bent Cap Configurations


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Cap Beams and Column to Cap
Beam Joints


Pier Cap Replacement


Pier Cap Strengthening


Reduction in Pier Cap Forces


Strengthening of Column and Beam Joints


Supergirders


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Pier Cap Replacement



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Cap Beams and Column to Cap
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Pier Cap Replacement


Pier Cap Strengthening


Reduction in Pier Cap Forces


Strengthening of Column and Beam Joints


Supergirders


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Pier Cap Strengthening


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Pier Cap Strengthening


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Bent Cap Strengthening


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Pier Cap Retrofit Test


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Bent Cap Strengthening


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Cap Beams and Column to Cap
Beam Joints


Pier Cap Replacement


Pier Cap Strengthening


Reduction in Pier Cap Forces


Strengthening of Column and Beam Joints


Supergirders


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Link Beam Retrofit


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Cap Beams and Column to Cap
Beam Joints


Pier Cap Replacement


Pier Cap Strengthening


Reduction in Pier Cap Forces


Strengthening of Column and Beam Joints


Supergirders


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Integral Bent Cap Retrofit


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Knee Joint Retrofit



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Cap Beams and Column to Cap
Beam Joints


Pier Cap Replacement


Pier Cap Strengthening


Reduction in Pier Cap Forces


Strengthening of Column and Beam Joints


Supergirders


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Supergirders