Partial Safety Factors for Prestressed Concrete Girders Strengthened with CFRP Laminates

被引：0

作者：

Dias-da-Costa, D. ^{[1
,2
]}

Neves, L. A. C. ^{[3
]}

Gomes, S. ^{[2
]}

Graca-e-Costa, R. ^{[4
,5
]}

Hadigheh, S. A. ^{[1
]}

Fernandes, P. ^{[5
,6
]}

机构：

[1] Univ Sydney, Sch Civil Engn, Sydney, NSW 2006, Australia

[2] Univ Coimbra, Inst Sustainabil & Innovat Struct Engn, Dept Civil Engn, Rua Luis Reis Santos, P-3030788 Coimbra, Portugal

[3] Univ Nottingham, Resilience Engn Res Grp, Fac Engn, Univ Pk, Nottingham NG7 2RD, England

[4] Univ Algarve, Ctr Escudos Patrimonio Paisagem & Construcao, Campus Gambelas, P-8005139 Faro, Portugal

[5] Univ Lisbon, Civil Engn Res & Innovat Sustainabil, Dept Civil Engn Architecture & Georesources, Inst Super Tecn, Av Rovisco Pais, P-1049001 Lisbon, Portugal

[6] Inst Politecn Leiria, Civil Engn Dept, P-2411901 Leiria, Portugal

来源：

JOURNAL OF COMPOSITES FOR CONSTRUCTION | 2020年 / 24卷 / 01期

基金：

澳大利亚研究理事会;

关键词：

CFRP laminates; Concrete girder; Reliability; Numerical models; Partial safety factors; Target reliability index; MECHANICAL-PROPERTIES; BEAMS; RELIABILITY; DISCRETE; CALIBRATION; MODELS;

D O I：

10.1061/(ASCE)CC.1943-5614.0000993

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper provides a framework for the calibration of partial safety factors in prestressed concrete (PC) girders strengthened in flexure with carbon fiber-reinforced polymer (CFRP) laminates. A hybrid approach was proposed to take advantage of comprehensive nonlinear numerical models in reliability analysis using a first-order reliability method (FORM) in conjunction with the response surface method (RSM). The PC girders selected for analyses were taken from real structures designed and built in the 1980s based on old standards that now require strengthening and upgrade due to partial corrosion of the prestressing strands. Using the proposed approach, a sensitivity analysis was performed to identify the most relevant variables and assess the area of CFRP laminates needed to restore capacity up to new design standards. A partial safety factor was proposed for strengthening PC girders using CFRP laminates. Sensitivity analysis showed that traffic loads and model uncertainties are the most important variables for calibration. (C) 2019 American Society of Civil Engineers.

引用

页数：13

共 45 条

[1]

AASHTO, 2012, Guide specifications for design of bonded FRP systems for repair and strengthening concrete bridge elements

[2]

Ang A. H. S., 2007, Probability Concepts in Engineering: Emphasis on Applications to Civil and Environmental Engineering

[3]

[Anonymous], 2008, 4402R08 ACI

[4]

[Anonymous], THESIS

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