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2024年3月25日发(作者:织梦采集视频教程)

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Guide for the Design and Construction of Concrete Reinforced with FRP

Bars (ACI 440.1R-03)

Copyright ASCE 2005

A. Nanni

1

1

Vernon & Maralee Jones professor of Civil Engineering, Center for Infrastructure

Engineering Studies, 1870 Miner Circle, ERL 224, University of Missouri – Rolla,

Rolla, MO 65409, USA; PH (573) 341-6215: FAX (573) 341-6215; e-mail:

nanni@

Abstract

This paper reports on the key features of the “Guide for the Design and

Construction of Concrete Reinforced with FRP Bars” issued by the American

Concrete Institute (ACI). For new construction, FRP bars have been used as the

internal reinforcement in concrete members to replace conventional steel rebars for a

host of reasons. The principles for design and construction were first established and

proposed to industry in 2001. The third revision of the guide is now under

preparation.

The Existing Document

In 2001, the American Concrete Institute (ACI) published the first guide offering

recommendations for design and construction of FRP-reinforced concrete (RC)

structures as an emerging technology (ACI 440, 2001). The document was re-issued

with some minor changes in 2003 (ACI 440, 2003). At present, the ACI Technical

Committee 440 is working on the third edition that presents some significant changes

from the current document. The current and new ACI documents of reference only

address non-prestressed FRP reinforcement. A separate ACI guide is devoted to

prestressed concrete using FRP tendons.

General

FRP materials are anisotropic and are characterized by high tensile strength with no

yielding only in the direction of the reinforcing fibers. This anisotropic behavior

affects the shear strength and dowel action of FRP bars, as well as their bond

performance. Design procedures account for a lack of ductility in concrete reinforced

with FRP bars. An FRP-RC member is designed based on its required strength and

then checked for serviceability and ultimate state criteria (e.g., crack width,

deflection, fatigue and creep rupture endurance). In many instances, serviceability

criteria may control the design.

1

Structures Congress 2005

Structures 2005

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Design values. The design tensile strength that should be used in all design equations

*

is given as

f

fu

=

C

E

f

fu

, where: f

fu

= design tensile strength of FRP considering

reductions for service environment; C

E

= environmental reduction factor given in

Table 1 for various fiber types and exposure conditions; and f

*

fu

= guaranteed tensile

strength of an FRP bar defined as the mean tensile strength of a sample of test

specimens, f

*

u,ave

,,minus three times the standard deviation,

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