scholarly journals Hybrid FRP Sheet – PP Fiber Rope Strengthening of Concrete Members

10.5772/51425 ◽  
2013 ◽  
Author(s):  
Theodoros C.
Keyword(s):  
Concrete Members ◽  
Frp Sheet

scholarly journals Experimental Study on FRP-to-Concrete Bonded Joints with FRP Sheet Anchor System

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Weiwen Li ◽  
Wei Liu ◽  
Xu Yang ◽  
Feng Xing
Keyword(s):  
Design Guidelines ◽  
Reinforced Concrete Beams ◽  
Constitutive Relationship ◽  
Bond Slip ◽  
Anchor System ◽  
Concrete Members ◽  
Cfrp Sheet ◽  
Externally Bonded ◽  
Anchor Systems ◽  
Frp Sheet

Fiber-reinforced polymer (FRP) has been widely used for retrofitting and strengthening concrete structures over the past two decades. Because concrete members retrofitted by externally bonded FRP sheets can fail prematurely in debonding because of the fracture between FRP and concrete, FRP tensile strength cannot be fully utilized in engineering practices. Numerous useful investigations have been conducted to develop effective anchor systems to restrict FRP debonding. Thus, an FRP sheet-anchor system was developed and observed to be one of the most effective and convenient anchor systems. The FRP sheet-anchor system is applied to reinforced concrete beams strengthened with U-wrapping and side-bonded FRP configurations in few design guidelines. However, only a few investigations have focused on the failure mechanism of the FRP sheet-anchor system in the existing literature. Therefore, the main objective of this study is analyzing the effect of the carbon FRP (CFRP) sheet-anchor system on the bonding behavior of the CFRP-concrete interface, particularly the effect of the width and stiffness of the CFRP sheet-anchor system. In addition, the anchor-strengthened stage is defined by the load-slip response, which is different from that of specimens without the CFRP sheet-anchor system. Based on the experimental results, three linear stage models of the bond-slip constitutive relationship are proposed in this study.

Flexural design of precast, prestressed ultra-high-performance concrete members

PCI Journal ◽  
2020 ◽  
Vol 65 (6) ◽  
pp. 35-61
Author(s):  
Chungwook Sim ◽  
Maher Tadros ◽  
David Gee ◽  
Micheal Asaad
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Limit State ◽  
Design Guidelines ◽  
Design Tool ◽  
Supplementary Cementitious Materials ◽  
Ultra High Performance Concrete ◽  
Concrete Members ◽  
Cylinder Strength

Ultra-high-performance concrete (UHPC) is a special concrete mixture with outstanding mechanical and durability characteristics. It is a mixture of portland cement, supplementary cementitious materials, sand, and high-strength, high-aspect-ratio microfibers. In this paper, the authors propose flexural design guidelines for precast, prestressed concrete members made with concrete mixtures developed by precasters to meet minimum specific characteristics qualifying it to be called PCI-UHPC. Minimum specified cylinder strength is 10 ksi (69 MPa) at prestress release and 18 ksi (124 MPa) at the time the member is placed in service, typically 28 days. Minimum flexural cracking and tensile strengths of 1.5 and 2 ksi (10 and 14 MPa), respectively, according to ASTM C1609 testing specifications are required. In addition, strain-hardening and ductility requirements are specified. Tensile properties are shown to be more important for structural optimization than cylinder strength. Both building and bridge products are considered because the paper is focused on capacity rather than demand. Both service limit state and strength limit state are covered. When the contribution of fibers to capacity should be included and when they may be ignored is shown. It is further shown that the traditional equivalent rectangular stress block in compression can still be used to produce satisfactory results in prestressed concrete members. A spreadsheet workbook is offered online as a design tool. It is valid for multilayers of concrete of different strengths, rows of reinforcing bars of different grades, and prestressing strands. It produces moment-curvature diagrams and flexural capacity at ultimate strain. A fully worked-out example of a 250 ft (76.2 m) span decked I-beam of optimized shape is given.

Flexural Behavior of Reinforced Concrete Circular Columns Strengthened with Hybrid FRP Sheet

2017 ◽  
Vol 5 (3) ◽  
pp. 927-934
Author(s):  
Jong-Myeong Beak ◽  
Jae-Il Sim ◽  
Sang-Su Ha ◽  
Eun Kyum Kim
Keyword(s):  
Reinforced Concrete ◽  
Flexural Behavior ◽  
Frp Sheet

Strengthening of Prefab Slab using Fiber Reinforce Composites

2017 ◽  
Vol MCSP2017 (01) ◽  
pp. 27-29
Author(s):  
Gitanjali Biswal ◽  
Manoj Kumar Rath ◽  
Sagarika Panda
Keyword(s):  
Glass Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Structural Members ◽  
Load Bearing ◽  
Concrete Members ◽  
Shrinkage Cracks ◽  
Glass Fiber Reinforced ◽  
New Material ◽  
Fiber Reinforce

The main objective of using strengthening of pre fab slab by wraping with frp to to make it more durable during shock as a modification for the prevention of shrinkage cracks. The aim of research is to strengthening of Pre-fab structures slab using glass fiber reinforced composites. Slabs will act as structural members; provide a sensible application for the new material because they can be casted as load bearing and non-load bearing concrete members.

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