scholarly journals Load-Bearing Capacity of Beams Reinforced with Composite Rebar in Regard to Existing Guidelines

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6116
Author(s):  
Norbert Olczyk ◽  
Jarosław Błyszko ◽  
Mateusz Techman
Keyword(s):  
Bearing Capacity ◽  
Experimental Tests ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Gfrp Bars ◽  
Reinforced Polymer ◽  
Steel Bars ◽  
Limited Application ◽  
Proper Design ◽  
Metallic Reinforcement

Non-metallic reinforcement such as fiber-reinforced polymer (FRP) is now being increasingly used in construction. Despite numerous similarities, elements reinforced with non-metallic bars work differently from the ones reinforced with steel bars, including cracking and failure mode. The examination of the stress state in these elements, so important for their proper design, raises many difficulties. The article presents the results of tests of bended beams reinforced with GFRP bars. The results of the experimental tests were compared with calculations based on selected design instructions. The results have shown that beams reinforced with GFRP exhibit increased cracking, higher deflection, and often mode of failure through crushing of concrete. The results have shown that in bended elements reinforced with the GFRP bars, the rebar often does not achieve the strength declared by the manufacturer. The study has shown that theoretical values of load-bearing capacity of beams reinforced with composite rebar differ greatly between different guidelines and instruction. The analysis showed that the use of GFRP bars as a replacement for steel bars is possible in demanding environmental conditions. However, excessive deflections and cracks may result in limited application due to overall serviceability requirements of the element.

scholarly journals Bending Stiffness, Load-Bearing Capacity and Flexural Rigidity of Slender Hybrid Wood-Based Beams

Forests ◽  
2018 ◽  
Vol 9 (11) ◽  
pp. 703 ◽  
Author(s):  
Barbara Šubic ◽  
Gorazd Fajdiga ◽  
Jože Lopatič
Keyword(s):  
Bearing Capacity ◽  
Flexural Rigidity ◽  
Bending Stiffness ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Hybrid Beams ◽  
Fibre Reinforced Polymer

Modern architecture suggests the use of opened spaces with large transparent envelope surfaces. Therefore, windows of long widths and large heights are needed. In order to withstand the wind loads, such wooden windows can be reinforced with stiffer materials, such as aluminium (Al), glass-fibre reinforced polymer (GFRP), and carbon-fibre reinforced polymer (CFRP). The bending stiffness, load-bearing capacity, and flexural rigidity of hybrid beams, reinforced with aluminium, were compared through experimental analysis, using a four-point bending tests method, with those of reference wooden beams. The largest increases in bending stiffness (29%–39%), load-bearing capacity (33%–45%), and flexural rigidity (43%–50%) were observed in the case of the hybrid beams, with the highest percentage of reinforcements (12.9%—six reinforcements in their tensile and six reinforcements in their compressive zone). The results of the experiments confirmed the high potential of using hybrid beams to produce large wooden windows, for different wind zones, worldwide.

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.

Comparison Experimental Tests of Behavior of the Slab-Column Structure after Removal of the Corner Support with Simplified Models Describing the Mechanism of Destruction

2014 ◽  
Vol 969 ◽  
pp. 78-84 ◽  
Author(s):  
Mirosław Wieczorek
Keyword(s):  
Bearing Capacity ◽  
Emergency Situation ◽  
Experimental Tests ◽  
Simplified Models ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Boundary State ◽  
Column Structure

The paper deals with the boundary state of the load-bearing capacity of a fragment of a slab-column structure in an emergency situation caused by the removal of a support at its corner. The paper presents the results of tests concerting the investigated element with the dimensions of 4000×4000×100 mm. Next, theoretically suggested mechanisms of the corner support have been dealt with, describing the behaviour of a slab-column structure after the removal of the support at the corner. The aim of the paper was to compare the results of test carried out in the laboratory with the values obtained by analytical calculations. The results of this analysis have been gathered in the summary.

Research on the Mechanical Properties of Fire-Damaged Reinforced Concrete Columns Strengthened with CFRP

2012 ◽  
Vol 193-194 ◽  
pp. 1429-1435
Author(s):  
Dong Liang Qiu ◽  
Kai Yu ◽  
Guo Feng Wang ◽  
Jun Hua Li
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Temperature Control ◽  
Concrete Columns ◽  
Load Bearing Capacity ◽  
Reinforced Concrete Columns ◽  
Load Bearing ◽  
Standard Fire ◽  
Reinforced Polymer

The mechanical properties of fire-damaged reinforced concrete columns rehabilitated by carbon fiber-reinforced polymer (CFRP) rods were studied. This study aims at the effectiveness of CFRP through the contrast test. Nine specimens were tested, including three normal temperature control specimens, and six specimens heated under ISO834 standard fire. After the specimens were exposed to fire, three of them were rehabilitated by CFRP. All specimens were loaded monotonically to failure in the same way. The results showed that the failure of reinforced concrete columns rehabilitated by CFRP was due to losing stabilization, whereas the others were material broken. Furthermore, because of the fire, the load-bearing capacity of specimens was all declined sharply compared with these at normal temperature. From this research, comparing with these normal temperature control specimens, the load-bearing capacity of specimens exposed to fire firstly was ranged from 0.25 to 0.37 times. But the ratio of the loading capacity of specimens rehabilitated by CFRP and normal temperature control ones was ranged from 0.54 to 0.67.

Experimental Tests of the Load-Bearing Capacity of the Bottom Reinforcement Bars Passing over the Column

2016 ◽  
Vol 837 ◽  
pp. 146-151 ◽  
Author(s):  
Barbara Wieczorek
Keyword(s):  
Bearing Capacity ◽  
Laboratory Tests ◽  
Experimental Tests ◽  
Simplified Model ◽  
Load Bearing Capacity ◽  
Load Bearing

In the paper the results of laboratory tests performed on a simplified model of a slab-column connection were presented. The aim of investigations was to find out at which value of the load the destruction of such a connection occurs due to a rupture of the bars above the column. In respective models the column was situated axially or eccentrically with respect to span of bars. In each case the reinforcement passing above the column consisted of bars with a diameter of ø8 mm, ø12 mm or ø16 mm. The obtained results of laboratory tests and calculations permitted to determine the relations between the exerted load and the displacement of the column in time and also were compared with the guidelines contained in the standards CSA A23.3 and ACI 352R. Based on the results, the reduction of the load bearing capacity of the reinforcement bars due to bending was determined.

Experimental Tests of Historic Bent Timber Elements Reinforced with Steel Hoop and Mortise-Tendon Joint

2015 ◽  
Vol 744-746 ◽  
pp. 129-132
Author(s):  
Hong Min Li ◽  
Hong Xing Qiu ◽  
Zhe Zhao
Keyword(s):  
Bearing Capacity ◽  
Control Method ◽  
Experimental Tests ◽  
Steel Tube ◽  
Bending Test ◽  
Lap Joint ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Restoration Work ◽  
Biological Corrosion

The paper presents the results of studies proposing to use steel hoop and mortise-tendon joint (SHMT), to reinforce beams with defects (biological corrosion, cracks) in order to restore their load-bearing capacity. The proposed solution, consisting in encapsulated or bonding steel tube outside of the damaged part, is suitable for restoration work in historic buildings. Moreover, owing to the fact that the reinforcing steel tubes are situated outside the lap joint , the possibility that the crack of reinforcing joint will reduced and the fire resistance of the element is increased. The displacement loading control method was adopted in bending test. The restoration in the load-bearing capacity of the tested beams amounted from 4.42% to over 44.52%.

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