Fiber-Reinforced Polymer Confined Rectangular Columns: Assessment of Models and Design Guidelines

2007 ◽  
Vol 104 (6) ◽  
Keyword(s):  
Design Guidelines ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Rectangular Columns

A proposed strengthening model considering interaction of concrete-stirrup-FRP system for RC beams shear-strengthened with EB-FRP sheets

2018 ◽  
Vol 37 (10) ◽  
pp. 685-700 ◽  
Author(s):  
Weiwen Li ◽  
Chengyue Hu ◽  
Zejie Pan ◽  
Wei Peng ◽  
Yong Yang ◽  
...  
Keyword(s):  
Effective Strain ◽  
Polymer System ◽  
Design Guidelines ◽  
Shear Capacity ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Externally Bonded

Many factors can affect the shear capacity of fiber-reinforced polymer in reinforced concrete beams shear-strengthened with externally bonded fiber-reinforced polymer composites. Undoubtedly, the interaction of concrete-stirrup-fiber-reinforced polymer system is one of the key factors. However, most of the existing fiber-reinforced polymer design guidelines do not take account of this important factor on predicting fiber-reinforced polymer shear capacity. This study provides an advanced strengthening model that comprehensively considers the interaction among concrete, stirrup, and fiber-reinforced polymer for calculating the fiber-reinforced polymer effective strain. The advanced strengthening model provides a more accurate prediction for the fiber-reinforced polymer shear contribution compared with existing design guidelines.

scholarly journals Application of Sustainable Bamboo-Based Composite Reinforcement in Structural-Concrete Beams: Design and Evaluation

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 696 ◽  
Author(s):  
Alireza Javadian ◽  
Ian F. C. Smith ◽  
Dirk E. Hebel
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Design Guidelines ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Structural Concrete ◽  
Concrete Members ◽  
Reinforced Polymer ◽  
Composite Reinforcement

Reinforced concrete is the most widely used building material in history. However, alternative natural and synthetic materials are being investigated for reinforcing concrete structures, given the limited availability of steel in developing countries, the rising costs of steel as the main reinforcement material, the amount of energy required by the production of steel, and the sensitivity of steel to corrosion. This paper reports on a unique use of bamboo as a sustainable alternative to synthetic fibers for production of bamboo fiber-reinforced polymer composite as reinforcement for structural-concrete beams. The aim of this study is to evaluate the feasibility of using this novel bamboo composite reinforcement system for reinforced structural-concrete beams. The bond strength with concrete matrix, as well as durability properties, including the water absorption and alkali resistance of the bamboo composite reinforcement, are also investigated in this study. The results of this study indicate that bamboo composite reinforced concrete beams show comparable ultimate loads with regards to fiber reinforced polymer (FRP) reinforced concrete beams according to the ACI standard. Furthermore, the results demonstrate the potential of the newly developed bamboo composite material for use as a new type of element for non-deflection-critical applications of reinforced structural-concrete members. The design guidelines that are stated in ACI 440.1R-15 for fiber reinforced polymer (FRP) reinforcement bars are also compared with the experimental results that were obtained in this study. The American Concrete Institute (ACI) design guidelines are suitable for non-deflection-critical design and construction of bamboo-composite reinforced-concrete members. This study demonstrates that there is significant potential for practical implementation of the bamboo-composite reinforcement described in this paper. The results of this study can be utilized for construction of low-cost and low-rise housing units where the need for ductility is low and where secondary-element failure provides adequate warning of collapse.

Additiv gefertigte Spannmittel für CFK-Bauteile*/Development of additive manufactured, highly integrative tensioning templates for CFRP components

2019 ◽  
Vol 109 (06) ◽  
pp. 407-412
Author(s):  
T. Götz ◽  
A. Gebhardt ◽  
P. Esch ◽  
M. Schneider ◽  
C. Vogel ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Design Guidelines ◽  
Machining Process ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Research Project ◽  
Reinforced Polymer ◽  
Clamping System ◽  
Carbon Fiber Reinforced

Die spanende Endbearbeitung von CFK-Bauteilen erfordert den Einsatz abgestimmter Spanntechnik. Das vorgestellte Forschungsvorhaben thematisiert die Untersuchung und Entwicklung additiv gefertigter hochintegrativer Spannmittel für die spanende Bearbeitung von kohlenstofffaserverstärkten Bauteilen und die Ableitung entsprechender Gestaltungsrichtlinien. Anhand der Gestaltungsrichtlinien wird ein Demonstrator gefertigt und weiterer Handlungsbedarf aufgezeigt.   The machining process of CFRP (carbon fiber reinforced polymer) components requires the use of suitable clamping technology. The presented research project is set to tap opportunities for developing additive manufactured clamping systems for the machining of CFRP components and the derivation of corresponding design guidelines. Based on these guidelines, a demonstrator clamping system is manufactured and further action requirements are outlined.

Eccentricity-based design-oriented model of fiber-reinforced polymer-confined concrete for evaluation of load-carrying capacity of reinforced concrete rectangular columns

2016 ◽  
Vol 35 (23) ◽  
pp. 1734-1758 ◽  
Author(s):  
Mohamed F M Fahmy ◽  
Omar A Farghal
Keyword(s):  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Fiber Reinforced Polymer ◽  
Confined Concrete ◽  
Load Carrying Capacity ◽  
Fiber Reinforced ◽  
Stress Strain ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Rectangular Columns

This study aimed to evaluate the load-carrying capacity of reinforced concrete rectangular columns confined with fiber-reinforced polymer composites and subjected to small eccentric loading. Seven design-oriented models of fiber-reinforced polymer-confined concrete were implemented in OpenSees software to establish the theoretical axial force-moment interaction diagram for rectangular columns. The examined models were categorized into two types: stress–strain models developed for fiber-reinforced polymer-confined non-circular concrete tested under the effect of concentric loading and others designed for fiber-reinforced polymer-confined non-circular concrete subjected to eccentric loading. The accuracy of these models was examined against the experimental results of eccentrically loaded fiber-reinforced polymer-confined reinforced concrete rectangular columns. Results indicated that the local stress–strain law obtained from the concentric compression tests would not reflect very well the local behavior of the compression zone of fiber-reinforced polymer-reinforced concrete members subjected to the combined effect of flexural and axial loadings. Adoption of a rational approach reflecting the impacts of eccentric loadings on the stress–strain relationship of the fiber-reinforced polymer-confined concrete revealed a much better evaluation of the load-carrying capacity of both reinforced concrete rectangular columns and plain concrete square columns under the effect of axial loads with various eccentricities.

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