scholarly journals Improving Flexural Behavior of Textile Reinforced Concrete One Way Slab by Removing Weft Yarns with Different Percentages

2018 ◽  
Vol 4 (12) ◽  
pp. 2903
Author(s):  
Omar Hamid Hussien ◽  
Amer M. Ibrahim ◽  
Suhad M. Abd
Keyword(s):  
Reinforced Concrete ◽  
Great Influence ◽  
Efficiency Factor ◽  
Flexural Behavior ◽  
Carbon Fabric ◽  
Textile Reinforced Concrete ◽  
Anchoring Effect ◽  
Bending Capacity ◽  
Negative Effect ◽  
Textile Fabric

Textile reinforced concrete that developed at recent years is composed of the continuous textile fabric incorporated into the cementitious matrix. The geometry of the textile reinforcements has a great influence on the TRC overall behavior since it affects the bond efficiency perfectly. The effect of weft yarns removing on the flexural behavior of (1500 × 500 × 50) mm one way slabs was investigated, eight layers of the carbon fabric were used with (50%, 67% and 75%) removing of weft yarns in addition to one specimen without removing. The four one- way slabs were casted by hand lay-up method, cured for (28) days and tested in flexure using four points method. The bending capacity and the bond efficiency factor were calculated according to the conditions of the equilibrium models by comparing with experimental results. The results revealed that with higher removing proportion there was a perfect improvement in the flexural capacity, higher first crack load, eminent post cracking stiffness, higher average concrete strain and lower ultimate mid span deflection and higher toughness and ductility. Furthermore, the results clarified that there is an optimum percent of weft yarns removing at which the damage occurrence around the weft yarns is significantly reduced, and this negative effect constriction overcome the positive anchoring effect.

Investigation of Bending Capacity of Concrete Elements Strengthened by Textile Reinforced Concrete

2016 ◽  
Vol 827 ◽  
pp. 227-230
Author(s):  
Ondřej Holčapek
Keyword(s):  
Reinforced Concrete ◽  
High Strength ◽  
Maximum Size ◽  
Cement Composite ◽  
Silica Sand ◽  
Bending Test ◽  
Experimental Program ◽  
Cement Matrix ◽  
Textile Reinforced Concrete ◽  
Bending Capacity

Presented contribution deals with using textile reinforced concrete containing newly invented high strength cement matrix for strengthening concrete structures. The issue of old concrete ́s surface interaction with newly applied slim layer of textile reinforced concrete is investigated and verified by bending test. Water to binder ration under 0.3, maximum size of used silica sand 1.2 mm, and compressive strength over 100 MPa characterize used fine grain cement matrix. Over 12 months old beams with dimension 100 x 100 x 400 mm made from ordinary concrete were used for strengthening during performed experimental program. Strengthening took place on bending side. Different number (1, 3 and 5) of textile fabrics made from alkali-resistant glass (surface density 275 g/m2) was applied into slim layer of cement composite. Increasing number of used fabrics leads to different failure mode due shearing force action.

scholarly journals Flexural Behavior of Textile-Reinforced Concrete

2016 ◽  
Vol 53 ◽  
pp. 01016 ◽  
Author(s):  
Anna Volkova ◽  
Alexey Paykov ◽  
Sergey Semenov ◽  
Oleg Stolyarov ◽  
Boris Melnikov
Keyword(s):  
Reinforced Concrete ◽  
Flexural Behavior ◽  
Textile Reinforced Concrete

Experimental Study on Load Bearing Capacity of Prefabricated Partially Encased Composite Beams

2021 ◽  
pp. 2150104
Author(s):  
Kai Wu ◽  
Shiqi Lin ◽  
Xiaoyi Liu ◽  
Fanshen Mao ◽  
Chengwei Tan
Keyword(s):  
Bearing Capacity ◽  
Superposition Principle ◽  
Great Influence ◽  
Reduction Rate ◽  
Test Results ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Shear Span ◽  
Bending Capacity ◽  
Negative Effect

To study the load bearing capacity of prefabricated partially encased composite (PEC) beams, 12 specimens were tested under cyclic loadings. According to the test results, when shear span ratio increases, the failure mode of the specimen changes from shear to bending, while the load bearing capacity of specimens decreases. Some specimens showed asymmetric damage of concrete on both sides of steel web, causing specimens’ bearing capacity to be controlled by bending and shearing as well as by torsion. The use of threaded rods has little effect on the ultimate load of prefabricated PEC beams, but has a great influence on the reduction rate of the load with the increase in shear span ratio. Using the superposition principle, a formula for calculating the shearing capacity of prefabricated PEC beams was proposed. Based on the plane section hypothesis, a method for predicting the bending capacity was also proposed. Two reduction factors were proposed to account for the negative effect of asymmetric damage on the bearing capacity and the weakened bending capacity of specimens without threaded rods. The calculated results match well with the experimental ones. Therefore, they can be used to predict the bending and shearing capacity of prefabricated PEC beams, while providing a reference for engineering design.

The effect of the ratio of Λ-shaped shear connectors on the flexural behavior of a reinforced concrete frame

2020 ◽  
Vol 23 (12) ◽  
pp. 2724-2740
Author(s):  
Quy Thue Nguyen ◽  
Ramazan Livaoğlu
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Nonlinear Behavior ◽  
Flexural Behavior ◽  
Seismic Action ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Shear Connectors ◽  
Concrete Frame ◽  
Bending Capacity

Failure in a structural system can appear because of different types of pathologies and can cause a large number of problems during seismic action. Among these pathologies are design and execution flaws, underestimation of the required capacity of cross-section or seismic demand, and use of low quality of materials. The jacketing technique for a frame element is the most common use strengthening method in the practice to remove such disadvantages in a structural system. Then, the shear stress transferability at the concrete-to-concrete interface surface is the main objective. Shear connectors application is a solution for that consideration, but the investigation in the literature focusing this point is not adequate. The effect of the ratio of steel shear connectors on the interfaces of a reinforced concrete frame constructed using reinforced concrete formworks on its flexural behavior is numerically evaluated. Initially, the same ratio of Π-shaped and Λ-shaped shear connectors, 0.312%, is applied to determine the more effective shape. It should be clear that the ratio of shear connectors on any separate surface is calculated as the fraction of the total area of the cross-section of shear connectors placed perpendicularly (Π-shaped) at the surface and the area of that surface. The same ratio is understood as after evaluating the Π-shaped shear links, each of them is replaced by a Λ-shaped link at the same location. As a result, compared to the bending capacity of the frame whose surfaces are smooth, Λ-shaped connectors enhance the bending capacity of the frame up to 9.67% while the amount of improvement brought by Π-shaped ones is modest, about 2.172%. After that, a wide variety of the ratio of Λ-shaped connectors, 9 values, are placed on concrete-to-concrete interfaces. Tremendously, due to clamping stress brought by Λ-shaped shear connectors at the concrete substrates, the nonlinear behavior is improved and the amount of enhancement rises as the number of applied connectors is augmented but not linearly. The most important observation is that the amount of improvement is insignificant after the ratio of shear connectors reaches the percentage of between 0.3% and 0.4%. On the other hand, compared with the frame whose interfaces are smooth, the displacement ductility factor of the frame strengthened using 0.4% decreases an amount of about 30%.

Flexural behavior of basalt textile-reinforced concrete

2018 ◽  
Vol 183 ◽  
pp. 7-21 ◽  
Author(s):  
Yunxing Du ◽  
Xinying Zhang ◽  
Fen Zhou ◽  
Deju Zhu ◽  
Mengmeng Zhang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Flexural Behavior ◽  
Textile Reinforced Concrete

An Investigation on Flexural Behavior of Reinforced Concrete Beam with Textile

2011 ◽  
Vol 243-249 ◽  
pp. 1008-1012 ◽  
Author(s):  
Shi Ping Yin ◽  
Shi Lang Xu
Keyword(s):  
Reinforced Concrete ◽  
Reinforced Concrete Beam ◽  
Flexural Behavior ◽  
Textile Reinforced Concrete ◽  
Dead Weight ◽  
Steel Reinforced Concrete ◽  
Steel Bar ◽  
Load Carrying ◽  
Analytical Formulae ◽  
Experimental Values

The textile reinforced concrete (TRC) member has no distinct failure symptom when it arrives at its ultimate load. At the same time, ordinary steel-reinforced concrete (RC) elements have large dead weight and can not efficiently restrict the expansion of the main crack of structures. In order to overcome the above disadvantages, a new architecture reinforced with a combination of the textile and steel bar was presented in this study. The analytical formulae of the proper beam using this new structure were derived, including the load-carrying capacity at different stages and load vs. mid- span deflection relationship during the entire loading process. The theoretical values were compared with the experimental values. It is shown that the theoretical values coincide with the experimental values well and the feasibility of the formulae is verified.

scholarly journals Experimental Study on the Flexural Behavior of Steel-Textile-Reinforced Concrete: Various Textile Reinforcement Details

2020 ◽  
Vol 10 (4) ◽  
pp. 1425 ◽  
Author(s):  
Jungbhin You ◽  
Jongho Park ◽  
Sun-Kyu Park ◽  
Sungnam Hong
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Specimen ◽  
Flexural Behavior ◽  
Textile Reinforced Concrete ◽  
Flexural Performance

In this study, one reinforced concrete specimen and six textile reinforced concrete (TRC) specimens were produced to analyze the flexural behavior of steel-textile-reinforced concrete. The TRC specimen was manufactured using a total of four variables: textile reinforcement amount, textile reinforcement hook, textile mesh type, textile lay out form. Flexural performance increases with textile reinforcement amount, textile reinforcement hook type and textile reinforcement mesh type. The flexural performance was improved when physical hooks were used. Furthermore, textile reinforcement was verified as being effective at controlling the deflection.

Flexural Behavior of Carbon-Textile-Reinforced Concrete I-Sections Beams

2021 ◽  
pp. 113540
Author(s):  
Kissila Botelho Goliath ◽  
Daniel C. T. Cardoso ◽  
Flavio de A. Silva
Keyword(s):  
Reinforced Concrete ◽  
Flexural Behavior ◽  
Textile Reinforced Concrete

scholarly journals Finite element analysis of flexural behavior of textile reinforced concrete slab

2021 ◽  
Vol 261 ◽  
pp. 02042
Author(s):  
Mingqiu Xu ◽  
Jianhua Shao ◽  
Baijian Tang ◽  
Hongming Li
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Concrete Slab ◽  
Element Model ◽  
Flexural Behavior ◽  
Textile Reinforced Concrete ◽  
Reinforced Concrete Slab ◽  
Element Analysis ◽  
Bending Load

Order to investigate the failure effect of textile reinforced concrete (TRC) plate under bending load, the corresponding finite element model is established. By comparing the numerical simulation results with the experimental results, the rationality and feasibility of the finite element model are verified, and then the crack extension of TRC and the ultimate strain of carbon textile are analyzed. The failure mode of the slab under bending load is obtained, and it is found that the carbon textile concrete slab has better reinforcement effect, which greatly improves the safety performance of concrete members.

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