Bond of Substandard Laps in Reinforced Concrete Beams Retrofitted with Post-Tensioned Metal Straps

被引：10

作者：

Helal, Yasser ^{[1
]}

Garcia, Reyes ^{[2
]}

Pilakoutas, Kypros ^{[3
,4
]}

Guadagnini, Maurizio ^{[2
]}

Hajirasouliha, Iman ^{[2
]}

机构：

[1] Ramboll Grp, Bristol, Avon, England

[2] Univ Sheffield, Dept Civil & Struct Engn, Sheffield S10 2TN, S Yorkshire, England

[3] Univ Sheffield, Dept Civil & Struct Engn, Construct Innovat, Sheffield S10 2TN, S Yorkshire, England

[4] Univ Sheffield, Dept Civil & Struct Engn, Ctr Cement & Concrete, Sheffield S10 2TN, S Yorkshire, England

来源：

ACI STRUCTURAL JOURNAL | 2016年 / 113卷 / 06期

关键词：

beams; bond strength; lap splices; post-tensioned metal strap confinement; reinforced concrete; retrofitting; splitting strength; SEISMIC RETROFIT; BEHAVIOR; FRP; COLUMNS; JACKETS;

D O I：

10.14359/51689021

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper investigates the bond-splitting performance of lapped steel bars in tension. Twelve reinforced concrete (RC) beams with substandard laps (lap length = 25 bar diameters) at midspan were tested in flexure. The variables examined include the bar diameter, concrete cover, and three different confinement conditions at midspan: 1) no confinement; 2) internal steel stirrups; and 3) external post-tensioned metal straps (PTMSs). The test results show that, in comparison to unconfined specimens, PTMS confinement enhances the bond strength of the lapped bars by up to 120%. Based on the results of this study, an innovative equation is proposed and validated to calculate the additional bond strength provided by PTMS confinement. The equation can be used for assessment and retrofit of substandard lapped bars in RC structures and should prove useful in practical retrofitting applications.

引用

页码：1197 / 1208

页数：12

共 50 条

[41] DEMOLITION OF POST-TENSIONED CONCRETE
LINDSELL, P
CONCRETE, 1975, 9 (01): : 22 - 25
[42] POST-TENSIONED CONCRETE SILOS
HANDA, ML
JOURNAL OF THE AMERICAN CONCRETE INSTITUTE, 1981, 78 (04): : 324 - 325
[43] Post-tensioned concrete floors
Raiss, Mark
Concrete (London), 1995, 29 (02): : 27 - 28
[44] POST-TENSIONED CONCRETE SILOS
不详
JOURNAL OF THE AMERICAN CONCRETE INSTITUTE, 1981, 78 (01): : 54 - 60
[45] Distinguished bond behaviour of CFRP sheets in unbonded post-tensioned reinforced concrete beams versus single-lap shear tests
Phuong Phan-Vu
Tran, Duong T.
Pham, Thong M.
Dang, Tung D.
Cuong Ngo-Huu
Long Nguyen-Minh
ENGINEERING STRUCTURES, 2021, 234
[46] Seismic performance of self-centering connections with steel beams post-tensioned to a reinforced concrete column
Department of Civil Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan
Journal of the CICHE, 2007, 3 (425-437):
[47] Analysis of concrete beams prestressed and post-tensioned with externally unbonded carbon fiber reinforced polymer tendons
Aziz, MA
Abdel-Sayed, G
Ghrib, F
Grace, NF
Madugula, MKS
CANADIAN JOURNAL OF CIVIL ENGINEERING, 2005, 32 (06) : 1138 - 1151
[48] Effect of Transverse Reinforcement on Shear Response of Fiber-Reinforced Polymer Post-Tensioned Concrete Beams
Peng, Fei
Xue, Weichen
ACI STRUCTURAL JOURNAL, 2022, 119 (05) : 31 - +
[49] Analytical model and parametric study for externally post-tensioned reinforced concrete-steel composite beams
El-Zohairy, Ayman
Alsharari, Fahad
Salim, Hani
STRUCTURES, 2020, 27 : 411 - 423
[50] Evaluation of experimental techniques for performance estimation of post-tensioned concrete beams
Castellanos-Toro, Sebastian
Panesso, Angelica M.
Marulanda, Johannio
Ortiz, Albert R.
Cruz, Alejandro
Thomson, Peter
CONSTRUCTION AND BUILDING MATERIALS, 2023, 393

← 1 2 3 4 5 →