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Repair, Retrofit and Rehabilitation ofShear Walls using Externally-Bonded

FRP Sheets

David T. Lau

Carlos A. Cruz Noguez

Edward Sherwood

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Phases 1 & 2(2000-2004): 7 walls designed according to

current code provisions, CSA A23.3-04 & ACI 318-05(slender walls)

Phase 3 (2010- ):

9 walls designed with to

old construction codes

(ACI 1968; CSA 1977)

Slender and squat walls

Insufficient

shearreinforcement

Introduction

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Hysteretic Base shear-top displacement relationships

Plain RC wall

Repaired wall

Strengthened

wall

Selected Experimental Results: Phase 2

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Shear Wall Specimens

Three different types of

walls: slender (h/l=1.20),

intermediate (h/l=0.85),

and squat (h/l=0.65)

Parameters:

Insufficient shear

reinforcement

Poor confinement of

concrete

Lap splices

Phase 3Experimental Setup

Lap Splice

= 36db

Slender Intermediate

Squat Squat w/ lap

Walls typical of older

constructive practices(pre-1970)

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Phase 3Experimental Setup

High-capacity loadingframe

2800 kN (630 kip)

ENERPAC actuator fitted

for cyclic loading

Adjustable to

accommodate walls with

various geometric details

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Phase 3Pre-test Analytical Results

Simulations conducted using the finite-element (FE)

package VecTor2 (Wong and Vecchio, 2002).

Vertical FRP

Truss

Horizontal

FRP

Truss

P

FRP Sheet

modeled as Discrete

Truss elements

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Phase 3Pre-test Analytical Results

With FRPNo FRP

No FRP With FRP

Sample results

Squat Wall 2 :

4 layers of FRP per side (Horizontal)

1 layer of FRP per side (Vertical)

Diagonal

tension failure

(brittle)

Crushing of

the concrete

(ductile)

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Phase 3Anchor System

Phase 1

STRUCTURAL ANGLE INNOVATIVE MECHANICAL TUBE

ADEQUATE ANCHORAGE IS CRITICAL FOR SUCCESS OF FRP SYSTEM!

Flexural applications

Load must be

transferred from the FRP

sheets to supporting

members/foundation

Anchorage

failure

(slippage)

FRP

Sheet

FRP

Sheet

Load

transfer

Phases 2 & 3

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Shear Wall Testing FacilityFuture Directions

Masonry Walls

Cyclic Testing

Prospective use of advanced

materials to enhance structural

response

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Shear Wall Testing FacilityFuture Directions

P

Actualtest

Analyticallymodeled

Hybrid Tests