00789874

Monograph

http://onlinepubs.trb.org.../NCHRP048_Final_Report.pdf

This Innovations Deserving Exploratory Analysis (IDEA) report describes a shape memory-based rehabilitation system that was developed to provide a rapid, efficient and low-cost approach with high levels of safety and reliability for the rehabilitation of deficient bridge structures. Shape memory alloys can recover deformations induced at lower temperatures upon heating above a transformation temperature. Restraint of this shape recovery tendency can generate large forces. The approach described here uses the forces generated during restrained shape recovery to transfer corrective forces to structural systems for accomplishing strengthening and repair tasks. For this purpose, shape memory rods are pre-elongated, anchored onto the structural system, and then subjected to electrical resistance heating to prompt shape recovery and transfer corrective forces to the structure.

This NCHRP-IDEA investigation was conducted by DPD, Incorporated, Lansing, Michigan. The original project title was Field Trials of Superelasticity-Based Bridge Rehabilitation. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

NCHRP-IDEA Project 48

NCHRP-48

English

41 p.

2000-3

NCHRP-IDEA Program Project Final Report

Figures (21) ; Photos (26) ; References (7)

Bridges; Rehabilitation; Repairing; Structural strengthening; Technological innovations

National Cooperative Highway Research Program

Shape memory alloys

Bridges and other structures; Highways; Maintenance and Preservation; I61: Equipment and Maintenance Methods

TRIS, TRB

Mar 27 2001 12:00AM