Minimum Reinforcement Ratio of Concrete Beams Reinforced with FRP Bars

2011 ◽  
Vol 282-283 ◽  
pp. 553-556
Author(s):  
Chun Xia Li ◽  
Shi Lin Yan
Keyword(s):  
Concrete Structure ◽  
Concrete Beams ◽  
Flexural Capacity ◽  
Concrete Member ◽  
Stress Strain ◽  
Concrete Cracking ◽  
Minimum Reinforcement ◽  
Stress Strain Relation ◽  
Simplified Calculation ◽  
Frp Bars

Based on the non-linearity stress strain relation of concrete, the cracking moment of plain flexural concrete member is established, and the flexural capacity of concrete beams reinforced with FRP bars is also obtained under FRP rupture-controlled failure. To prevent FRP rupture failure upon concrete cracking, the minimum reinforcement ration should be derived from simplified calculation, which may provide some theoretic guidance on design and construction for concrete structure reinforced with FRP bars.

Flexural Capacity of Singly Reinforced CRC Beams(Part-I)

2010 ◽  
Vol 168-170 ◽  
pp. 1810-1814 ◽  
Author(s):  
Han Zhu ◽  
Lin Hu Yang ◽  
Lin Yuan
Keyword(s):  
Concrete Beams ◽  
Crumb Rubber ◽  
Mechanical Analysis ◽  
Flexural Capacity ◽  
Stress Strain ◽  
Conventional Concrete ◽  
External Moment ◽  
Strain Relationship ◽  
Material Conditions ◽  
Rubber Concrete

Crumb rubber concrete (CRC) is made by adding rubber crumbs into conventional concrete, and many studies show that ultimate compressive strains for CRC are much bigger than those for conventional concrete. This article undertakes a mechanical analysis of a reinforced beam based on a proposed CRC stress-strain relationship. The results show that, assuming identical geometrical and material conditions, CRC beam can support more external moment than what conventional concrete beams can do.

scholarly journals STRESS-STRAIN RELATION FOR CONCRETE IN NONUNIFORM TENSION

2019 ◽  
Vol 15 (4) ◽  
pp. 164-169
Author(s):  
Michael Zak
Keyword(s):  
Tensile Stress ◽  
Concrete Beams ◽  
Stress Strain ◽  
Strain Relation ◽  
Stress Strain Relation

Discrepancy between reported in the literature tensile stress-strain relations for concrete is addressed. A conclusion is reached that in the post-peak (softening) range of deformation the stress-strain relation is not unique and depends on the gradient of stress. A simplified variant of such a relation, intended for analysis of concrete beams with regard to the effect of size (the depth of section), is proposed.

Influence of Temperature on the Cracking of Reinforced Concrete Frame

2008 ◽  
Vol 400-402 ◽  
pp. 963-968
Author(s):  
Jin Song Lei ◽  
Dong Sheng Yang ◽  
Shan Chuan Ying ◽  
Yin Sheng Zou
Keyword(s):  
Reinforced Concrete ◽  
Reinforced Concrete Frame ◽  
Stress Strain ◽  
Element Analysis ◽  
Concrete Cracking ◽  
Influence Of Temperature ◽  
Concrete Frame ◽  
Strain Relation ◽  
Stress Strain Relation ◽  
Influence Of Temperature On

In this paper, the influence of temperature on the cracking of reinforced concrete frame is studied. Finite element analysis software is used to simulate the concrete cracking. In the modeling process, separate model element of SOLID65+LINK8 is used. Also, the Hongestad model is applied to the stress-strain relation of concrete and the rule of BISO is applied to the stress-strain relation of steel. By comparing the stress and strain of three different structure frames before and after temperature increasing, the extending rules of concrete cracking and the stress character of beam and column are analyzed. It is found that the maximum stress of beam is located in the end of the beam-column joints and the middle of beam under the temperature action. It is suggested that they are caused by moment and axis-force respectively. However, the greatest stress of column is situated at the end of beam-column joints. The reason is that the end of beam-column joints should deform to coordinate the influence of temperature. Thus, greater peak stress is caused. So, the concrete cracking is always distributed in the middle of beam span or beam-column joints, where the position of stress concentrates. In addition, the stress of steel in beams increases greatly under the temperature load, suggesting that the temperature leads to the internal force redistribution in the concrete component and the cracking of component.

Discussion on Formula for the Flexural Capacity of Concrete Beams Strengthened with FRP

2015 ◽  
Vol 1094 ◽  
pp. 278-281
Author(s):  
Xu Jun Chen ◽  
Qiao Yang ◽  
Jun Guo
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Concrete Beams ◽  
Fiber Reinforced ◽  
Reinforced Concrete Structure ◽  
Flexural Capacity ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Tension Strength

The flexural capacity formula of reinforced concrete structure strengthened with FRP in Code for Design of strengthening concrete structure(GB 50367—2013) was introduced, and the rationality of the formula was analyzed. The results showed that the concrete compression height is independent of the tension strength of Fiber Reinforced Plastic (FRP), and the concrete compression height decreases with the increase of the tension strain of FRP, which is contrary to fact. The flexural capacity formula of reinforced concrete structure strengthened with FRP in Code for Design of strengthening concrete structure (GB 50367—2013) is worth discussing.

Analisa Pola Kegagalan Balok Beton Menggunakan GFRP Bar Tanpa Selimut Beton

2020 ◽  
Vol 24 (1) ◽  
pp. 11-16
Author(s):  
Saddam - Husein ◽  
Rudy Djamaluddin ◽  
Rita Irmawaty ◽  
Kusnadi Kusnadi
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Concrete Cover ◽  
Steel Reinforcement ◽  
Fiber Reinforced Polymer ◽  
Mode Analysis ◽  
Flexural Capacity ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Gfrp Bar

SADDAM HUSEIN. Analisa Pola Kegagalan Balok Beton Menggunakan GFRP Bar Tanpa Selimut Beton (dibimbing oleh Rudi Djamaluddin dan Rita Irmawaty) Struktur beton bertulang yang menggunakan tulangan baja pada daerah korosif, menjadi rawan terhadap kerusakan atau penurunan kekuatannya akibat korosi.Korosi pada tulangan baja merupakan salah satu faktor penyebab menurunnya kekuatan struktur beton bertulang. Salah satu material yang dikembangkan mengatasi korosi adalah penggunaan material tulangan GFRP (Glass Fiber Reinforced Polymer). Penelitian ini bertujuan untuk menganalisa kapasitas lentur dan pola kegagalan balok beton tanpa selimut dengan menggunakan material tulangan GFRP bar.   Desain penelitian merupakan eksperimental laboratorium dengan rekapitulasi sebanyak 6 sampel yang terdiri dari 2 Balok beton menggunakan tulangan baja dengan selimut beton, 2 balok beton menggunakan tulangan GFRP bar dengan selimut beton, 2 balok beton menggunakan GFRP bar tanpa selimut beton. Metode pengujian dilakukan dengan dengan pengujian lentur statik monotonik dan Analisis data menggunakan uji kondisi retak awal dan kondisi ultimit.   Hasil penelitian ini menunjukkan bahwa kapasitas lentur pada balok dengan tulangan GFRP bar lebih besar dibandingkan dengan balok tulangan baja dan mampu meningkatkan kapasitas lentur balok dalam menahan beban sebesar 39.76 %, pola kegagalan beton yang terjadi pada balok tulangan baja mengalami kegagalan lentur tekan ditandai dengan retakan yang terjadi pada sisi tertekan dan membentuk retakan tegak dengan sumbu netral beton yang tertekan, sedangkan pada balok beton tulangan GFRP tanpa selimut mengalami kegagalan keruntuhan tekan geser dengan kondisi tulangan berdeformasi (bi-linear) dengan retak miring dan secara tiba-tiba menjalar menuju sumbu netral beton yang tertekan sehingga terjadilah keruntuhan secara tiba-tiba.     SADDAM HUSEIN.Failure mode analysis of concrete Beams Using GFRP rebar Without concrete cover (supervised by Rudi Djamaluddin and Rita Irmawaty)   Reinforced concrete that uses rebar steel in corrosive areas, are prone to damage or decreased strength due to corrosion. Corrosion in the steel reinforcement is one of the factors that decreasing strength of reinforced concrete. One of the materials developed to overcome corrosion is the use of GFRP (Glass Fiber Reinforced Polymer) reinforcement material. This study aims to analyze the flexural capacity and failure mode of concrete beams without concrete cover using material GFRP bar as reinforcement.   The research design was an experimental laboratory with a recapitulation of 6 samples consisting of 2 beams using steel reinforcement with concrete cover.2 concrete beams using reinforcement GFRP bar with concrete cover, 2 beams using GFRP bars without concrete cover. The  research method uses the monotonic static flexure and analyzing the data using the initial crack condition and ultimate conditions test.   The results of the research indicate the flexural capacity of the beams with GFRP bar reinforcement is higher than steel reinforcement beams and can increase 39.76% of the flexural capacity of the beams in holding loads , the failure mode analysis occurs in steel reinforcing beam experiences compressive failure. Failure was characterized  by cracks that occur on the depressing side and form an upright crack with the neutral axis of the compressed concrete, whereas in GFRP reinforced concrete beams without concrete cover, failure of shear compression with conditions of deformed reinforcement (bi-linear) with sloping cracks and suddenly spread towards the neutral axis of the compressed concrete so that there was a sudden collapse.

Flexural behavior of partially fiber-reinforced high-strength concrete beams reinforced with FRP bars

2018 ◽  
Vol 161 ◽  
pp. 587-597 ◽  
Author(s):  
Haitang Zhu ◽  
Shengzhao Cheng ◽  
Danying Gao ◽  
Sheikh M. Neaz ◽  
Chuanchuan Li
Keyword(s):  
High Strength Concrete ◽  
Concrete Beams ◽  
High Strength ◽  
Flexural Behavior ◽  
Fiber Reinforced ◽  
Strength Concrete ◽  
Frp Bars
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