Experimental Study on the Durability of Square-Section Columns Externally Wrapped with Carbon Fiber Reinforced Polymer

2011 ◽  
Vol 291-294 ◽  
pp. 2205-2210
Author(s):  
Ling Ling Zhang ◽  
Jian Xun Ma ◽  
Ling Zhang
Keyword(s):  
Experimental Study ◽  
Carbon Fiber ◽  
Environmental Factors ◽  
Damage Model ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Load Bearing ◽  
Freeze And Thaw ◽  
Reinforced Polymer ◽  
Bonding Length

This paper mainly studied the durability of square-section columns wrapped with CFRP by experiments. Three kinds of columns, such as columns without CFRP, columns wrapped with CFRP entirely and columns wrapped with CFRP strips, were considered. The environmental factors included dry and wet cycles of saltwater, the coupled action of freeze and thaw cycles and dry and wet cycles. The results show that the load bearing capability and the ductility of the columns wrapped with CFRP are improved greatly. The external environments have an ignoring effect on the damage model, the ductility and the stiffness of axial compressed columns, but they have an extremely effect on the load bearing capability. The load bearing capability of the columns wrapped with CFRP strips decreased more than that of the columns wrapped with CFRP entirely. And no matter how environments，the bonding between column and CFRP has no damage in this experimental study with the bonding length of 100mm.

Stress of Carbon Fiber Reinforced Polymer Tendons in Prestressed Simply Supported Beams

2013 ◽  
Vol 689 ◽  
pp. 353-357
Author(s):  
Chong Xi Bai ◽  
Xin Yan Shao ◽  
Qiu Ping Wang
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Simply Supported ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

The law of stress increment of unbonded carbon fiber reinforced polymer (CFRP) tendons at service stage and flexural load bearing capacity limit state is unclear, so it is difficult to accurately calculate crack width, deflection and load bearing capacity. In order to calculate the stress of CFRP tendons, deformation compatibility condition and moment-curvature analysis method are used to compile nonlinear full-range analysis programs of simply supported concrete beam partially prestressed with unbonded CFRP tendons. The computing results of stress in CFRP tendons are in good agreement with the tested results as a whole, so it indicates that the simulation analysis programs are reliable.

Experimental Study on Shear Capacity of RC Beams Strengthened with Carbon Fiber Reinforced Polymer Mandated by ACli 440

2016 ◽  
Vol 845 ◽  
pp. 154-157
Author(s):  
Sri Tudjono ◽  
Himawan Indarto ◽  
Monica Devi
Keyword(s):  
Experimental Study ◽  
Carbon Fiber ◽  
Shear Capacity ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Rc Beam ◽  
Rc Beams ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

Shear reinforcement for retrofitting an RC beam using unidirectional Carbon Fiber Reinforced Polymer (CFRP) woven can only be applied on the beam’s body below the concrete floor slab. Thus, it cannot fully curb like the way stirrups do, in which it will affect the shear capacity. The CFRP can only be ‘n’or ‘u’ shaped, taking into consideration the direction of shear force. Herein, the experimental study of the shear capacity ofshear capacity the beam strengthened by FRP is carried out.shear capacity The beams are RC beams of width 150 mm, height 300 mm, span of 1000 mm, f'c = 26 MPa having 2 bar of 19 mm diameter (fy = 403.65 MPa) and stirrups 6 mm diameter of 250 mm spacing (fy=375 MPa). The shear capacity measured is then compared with the shear capacity calculated using ACI 440. The result shows that the shear capacity measured from experiment is greater than the shear capacity calculated by ACI 440. Also, theshear capacity of RC beam with CFRP reinforcement n shape is greater than u shape.

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