scholarly journals Principles of reliability evaluation of reinforced concrete beams, strengthened with additional reinforcing bars under loading

2018 ◽  
Vol 19 ◽  
pp. 94-97
Author(s):  
R. Tytarenko ◽  
◽  
R. Khmil ◽  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reliability Evaluation ◽  
Reinforced Concrete Beams ◽  
Reinforcing Bars

Reliability evaluation of reinforced concrete beams

1994 ◽  
Vol 14 (4) ◽  
pp. 277-298 ◽  
Author(s):  
Renjian Lu ◽  
Yuanhui Luo ◽  
Joel P. Conte
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reliability Evaluation ◽  
Reinforced Concrete Beams

Experimental Study on Flexural Behavior of Reinforced Concrete Beams with Variety Lap Splices of Reinforcing Steel Bars

2016 ◽  
Vol 845 ◽  
pp. 132-139
Author(s):  
Mochamad Teguh ◽  
Novia Mahlisani
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Reinforced Concrete Structures ◽  
Reinforcing Steel ◽  
Reinforcing Bars ◽  
Lap Splices ◽  
Steel Bars

The limited lengths of reinforcing bars have been commonly found in the practical construction of most reinforced concrete structures. The required length of a bar may be longer than the available stock of steel length. For maintaining desired continuity of the reinforcement in almost all reinforced concrete structures, some reinforcing bars should be carefully spliced. In the case of long flexural beam, bar installers end up with two or even more pieces of steel that must be spliced together to accomplish the desired steel length. An experimental study was conducted to investigate flexural behavior of reinforced concrete beams utilizing a variety lap splices of reinforcing steel bars under two-point loading. Five variations of lap splices of reinforcing steel bars positioned at midspan of tensile reinforcement of the beam were investigated. Welded joints and overlapped splices were used to construct the variation of lap splices of reinforcing steel bars. The general trend in crack pattern, the load deflection characteristics and the mode of failure of flexural beams under two-point loading were also observed. The flexural strength comprising load-displacement response, flexural crack propagation, displacement ductility is briefly discussed in this paper.

scholarly journals Transverse Impact on Rectangular Metal and Reinforced Concrete Beams Taking into Account Bimodularity of the Material

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1579 ◽  
Author(s):  
Alexey Beskopylny ◽  
Besarion Meskhi ◽  
Elena Kadomtseva ◽  
Grigory Strelnikov
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Normal Stresses ◽  
Reinforcing Bars ◽  
Stress Strain ◽  
Stress Strain State ◽  
Tension And Compression ◽  
The Impact

This article is devoted to the stress–strain state (SSS) study of metal and reinforced fiber-reinforced concrete beam under static and shock loading, depending on the bimodularity of the material, the mass of the beam, and the location of the reinforcing bars in zones under tension and compression. It is known that many materials have different tensile and compression properties, but in most cases, this is not taken into account. The calculations were carried out by using load-bearing metal beams made of silumin and steel and reinforced concrete beams under the action of a concentrated force applied in the middle of the span. The impact load is considered as the plastic action of an absolutely rigid body on the elastic system, taking into account the hypothesis of proportionality of the dynamic and static characteristics of the stress–strain state of the body. The dependences of the maximum dynamic normal stresses on the number of locations of reinforcing bars in zones under tension and compression, the bimodularity of the material, and the reduced mass of the beam are obtained. A numerical study of SSS for metal and concrete beams has shown that bimodularity allows the prediction of beam deflections and normal stresses more accurately.

scholarly journals TENSION STIFFENING BOND MODELLING OF CRACKED FLEXURAL REINFORCED CONCRETE BEAMS/SUPLEIŠĖJUSIŲ GELŽBETONINIŲ SIJŲ ARMATŪROS IR BETONO SANKIBOS MODELIAVIMAS

2008 ◽  
Vol 14 (2) ◽  
pp. 131-137 ◽  
Author(s):  
Salah Khalfallah
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Numerical Approach ◽  
Reinforced Concrete Beams ◽  
Reinforcing Bars ◽  
Transfer Length ◽  
Element Analysis ◽  
Bond Slip ◽  
Pull Out ◽  
Non Linear

This paper deals with the analysis of cracked flexural reinforced concrete structures with special highlighting of modelling the interaction between concrete and reinforcement. A new approach based on the bond stress distribution through the transfer length between the zero‐slip and the cracked sections is proposed. Since the cracking phenomenon of concrete occurs, the fracture energy changes in order to appeal to the interaction between concrete and steel. The increment of stresses is evaluated by the bond‐slip distribution by means of one‐dimensional problem. Besides, the 2D nonlinear description of components behaviour, concrete and steel are considered. On numerical modelling level, the interaction property is obtained from a variety of fundamental pull out and push out tests, for the most part this phenomenon does not very well represent the bending members. For this object, this study presents a numerical approach, which can compute the distribution stresses at the steel‐concrete interface near flexural crack in reinforced concrete beams. Finally, predictions made by the non‐linear finite element analysis program and the non‐linear material models for concrete, reinforcing bars and bond slip are in good agreement with the experimental results. Santrauka Straipsnyje atlikta supleišėjusių lenkiamųjų gelžbetoninių elementų analizė armatūros ir betono sąveikos modeliavimo aspektu. Pasiūlytas naujas modelis, pagrįstas sukibimo įtempių pasiskirstymu sąveikos zonos ilgiu nuo nulinio praslydimo iki plyšio pjūvio. Supleišėjus betonui dėl jo sąveikos su armatūra keičiasi irimo energija. Įtempių didėjimas sukibimo ir praslydimo zonoje įvertinamas taikant vienmatį (1D) modelį. Sąveikos komponentų (betono ir armatūros) elgsena aprašoma pasitelkiant dvimačius (2D) modelius. Atliekant skaitinį modeliavimą, betono ir armatūros sąveikos parametrai dažniausiai nustatomi pagal klasikinius ištraukimo ir išstūmimo bandymus. Tačiau lenkiamiesiems elementams taip nustatyti parametrai netinka. Pasiūlytas skaitinis supleišėjusių lenkiamų gelžbetoninių sijų skaičiavimo algoritmas, kurį taikant gali būti nustatytas įtempių pasiskirstymas plieno ir betono sąveikos paviršiuje pjūvyje ties plyšiu. Skaičiavimo rezultatai, gauti taikant netiesinės analizės baigtinių elementų programą kartu su betono, armatūros ir sankibos modeliais, gerai sutapo su eksperimentinių tyrimų rezultatais.

Flexural and Crack Behaviors of RC Beams Applied with UHTCC Cover Subjected to Rebar Corrosion

2010 ◽  
Vol 168-170 ◽  
pp. 1304-1307
Author(s):  
Xin Hua Cai ◽  
Shi Lang Xu ◽  
Zhen He
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
High Performance ◽  
Concrete Beams ◽  
Ductile Failure ◽  
Reinforced Concrete Beams ◽  
Bending Test ◽  
Cementitious Composite ◽  
Reinforcing Bars ◽  
Reinforcing Bar

Ultra high toughness cementitious composite (UHTCC) is a newly developed, high performance, fiber-reinforced cementitious composite with substantial benefit in both high ductility and improved durability due to its tight crack width. The failure pattern of UHTCC exhibits saturated multiple fine cracks, so the durability of structures will be improved markedly by utilizing UHTCC partly or entirely instead of concrete. In this study, a total of 20 beams, including reinforced concrete beams that the cover zone was replaced by UHTCC (the thickness is 15mm, not containing reinforcement, and 50mm, containing reinforcement, respectively), reinforced concrete beams and reinforced UHTCC beams, had been manufactured. A power supply was used to accelerate the corrosion process of reinforcing bars, inducing different degrees of corrosion (the corrosion ratio was 1%, 2%, 4% and 5%) into reinforcing bars. The time of the cracks occurred and the crack width were recorded and the beams having different corrosion ratios of reinforcing bars were then tested under four-point bending for their load-deflection relations. The results showed that UHTCC could restrict the corrosion expansive crack of cover effectively, convert the crack pattern, and delay the appearance of first corrosion expansive crack, thereby to raise the service life of reinforcement concrete structures or components. Meanwhile, the bending test of beams after accelerated corrosion showed that the beams with a cover replaced by 50mm UHTCC and reinforced UHTCC having smaller amount of strength reduction and a reasonable ductile failure after corrosion. The experimental results showed that UHTCC could effectively delay the cover expansive cracking due to corrosion of reinforcing bars retain the ductile properties of reinforced concrete beams after reinforcing bar corroded.

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