A Simple Model for Maximum Diagonal Crack Width Estimation of Shear-Strengthened Pre-damaged Beams with CFRP Strips

2021 ◽  
pp. 102716
Author(s):  
Feng Yu ◽  
Yuan Fang ◽  
Shengquan Guo ◽  
Rui Bai ◽  
Longlong Yin ◽  
...  
Keyword(s):  
Simple Model ◽  
Crack Width ◽  
Damaged Beams ◽  
Diagonal Crack

scholarly journals Experimental Study on Shear Behavior of Steel Fiber Reinforced Concrete Beams with High-Strength Reinforcement

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1682 ◽  
Author(s):  
Jun Zhao ◽  
Jingchao Liang ◽  
Liusheng Chu ◽  
Fuqiang Shen
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Steel Fiber ◽  
High Strength ◽  
Shear Behavior ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Diagonal Crack

Many researchers have performed experimental and theoretical studies on the shear behavior of steel fiber reinforced concrete (SFRC) beams with conventional reinforcement; few studies involve the shear behavior of SFRC beams with high-strength reinforcement. In this paper, the shear test of eleven beams with high-strength reinforcement was carried out, including eight SFRC beams and three reinforced concrete (RC) beams. The load-deflection curve, concrete strain, stirrup strain, diagonal crack width, failure mode and shear bearing capacity of the beams were investigated. The test results show that steel fiber increases the stiffness, ultimate load and failure deformation of the beams, but the increase effect of steel fiber decreases with the increase of stirrup ratio. After the diagonal crack appears, steel fiber reduces the concrete strains of the diagonal section, stirrup strains and diagonal crack width. In addition, steel fiber reduces crack height and increases crack number. Finally, the experimental values of the shear capacities were compared with the values calculated by CECS38:2004 and ACI544.4R, and the equation of shear capacity in CECS38:2004 was modified to effectively predict the shear capacities of SFRC beams with high-strength reinforcement.

A Simplified Model for Crack Width Prediction of Flexural-Strengthened High Pre-Damaged Beams with CFRP Sheet

2020 ◽  
Vol 24 (12) ◽  
pp. 3746-3764
Author(s):  
Feng Yu ◽  
Yuan Fang ◽  
Hao Zhou ◽  
Rui Bai ◽  
Changfeng Xie
Keyword(s):  
Crack Width ◽  
Simplified Model ◽  
Cfrp Sheet ◽  
Damaged Beams

Experiment and Numerical Study on Shear Capacity of RC Beams

2011 ◽  
Vol 94-96 ◽  
pp. 674-678
Author(s):  
Jun Liu ◽  
Feng Peng Zhang ◽  
Yin Bo Zuo
Keyword(s):  
Cyclic Loading ◽  
Crack Width ◽  
Numerical Study ◽  
Shear Capacity ◽  
Experimental Result ◽  
Rc Beams ◽  
Shear Transfer ◽  
Fem Method ◽  
The Relationship ◽  
Diagonal Crack

Based on cyclic loading experiment of six beams in the two groups, the relationship among the stirrup stress, initial diagonal crack width and shear capacity of RC beams was studied. Experimental result shows that the decline of the shear strength of the RC beams due to cyclic loading can be characterized by the width of diagonal crack, according to the experimental phenomena, a formula for shear capacity after cyclic loading is derived for engineering use. To study the mechanism of the capacity decline, considering the effect of the width of diagonal crack to the shear transfer coefficient, numerical analysis by FEM method was done, the result is compared to the experimental result.

A Research on Diagonal Crack Width Formula of RC Beam

2011 ◽  
Vol 374-377 ◽  
pp. 909-912
Author(s):  
Chuang Du ◽  
Xiao Ming Yang ◽  
Yan Yan Li
Keyword(s):  
Crack Width ◽  
Concrete Beam ◽  
Failure Criteria ◽  
Reinforced Concrete Beam ◽  
Geometric Condition ◽  
Rc Beam ◽  
Oblique Section ◽  
Concrete Failure ◽  
Shear Performance ◽  
Diagonal Crack

Based on the shear performance of existing reinforced concrete beam oblique section and referring to the slipping theory of bending crack of the beam, a formula of the diagonal crack width is proposed through the equilibrium condition, the geometric condition and the concrete failure criteria. This formula has explicitly and clearly the physical concept.So,it can be used to check the maximum diagonal crack width of RC beam in the design.

Experimental Research on Shear Behavior of Reinforced Concrete Beams with High-Strength Stirrup under Uniform Load

2012 ◽  
Vol 256-259 ◽  
pp. 719-723
Author(s):  
Yan Yan Li ◽  
Yan Ping Zhang ◽  
Yan Feng Chen
Keyword(s):  
Experimental Research ◽  
Crack Width ◽  
Concrete Beams ◽  
Concrete Strength ◽  
High Strength ◽  
Shear Behavior ◽  
Reinforced Concrete Beams ◽  
Uniform Load ◽  
Steel Bars ◽  
Diagonal Crack

According to tests of 8 T concrete beams with HRB500 steel bars as stirrup, the shear behavior of beams was researched under uniform load, and the influencing factors of diagonal crack width were analyzed, such as the different concrete strength, stirrup spacing and the welded wire fabric. Experimental results show that concrete beams with HRB500 steel bars as stirrup show similar behavior to the beams with conventional stirrup, and the stirrups yield can be achieved which meets the requirement of shear behavior in structure. In addition, the welded wire fabric can be used as one of the new kinds of reinforcement to control diagonal crack width.

scholarly journals Diagonal crack width towards the experimental results

2013 ◽  
Vol 12 (1) ◽  
pp. 139-146
Author(s):  
Rafał Ostromęcki
Keyword(s):  
Crack Width ◽  
Shear Crack ◽  
Limit State ◽  
Critical Factor ◽  
Load Level ◽  
Rc Beams ◽  
Direct Control ◽  
Eurocode 2 ◽  
Maximum Crack ◽  
Diagonal Crack

The results of research on diagonal crack width in a single span RC beams were presented in the article. Eurocode 2 rules do not require the direct control of shear crack width. It is assumed, that reinforcement designed to carry the transverse force is also enough to limit the crack width. Experiments were led on beams grouped into four series differing in the links spacing and area of longitudinal tensile reinforcement anchored on supports. The transverse reinforcement steel was of fyd =500MPa The crack width was measured in the following phases of loading. The force was estimated for every series, which was represented by the load level for which the serviceability limit state should be controlled. Maximum crack width was read for this value of force and compared to the limit of 0,3mm. The conclusion was drawn, that crack width is not a critical factor for beams designed for shear with the use of Eurocode and Polish National Annex.

Experiment Study on Shear Capacity of RC Beams

2011 ◽  
Vol 243-249 ◽  
pp. 5733-5738
Author(s):  
Jun Liu ◽  
Feng Peng Zhang ◽  
Yin Bo Zuo ◽  
Jin Chao Ma
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Crack Width ◽  
Shear Capacity ◽  
Experimental Result ◽  
Rc Beams ◽  
Load Amplitude ◽  
Number Of Cycles ◽  
The Relationship ◽  
Diagonal Crack

Based on cyclic loading experiment of nine beams in the two groups, the relationship among the average web stress, initial diagonal crack width and shear capacity of RC beams was studied. Experimental result shows that the decline of the shear strength of the RC beams due to cyclic loading can be characterized by the width of diagonal crack. Under the same load amplitude, the larger crack width is, the greater the decline of the bearing capacity is. Besides, under the same number of cycles, the greater the load amplitude is, the larger the crack width is, the greater the decline in the bearing capacity of beams is. In addition, according to the experimental phenomena and the shear compression failure mechanism of beam, a formula for shear capacity after cyclic loading is derived for engineering use.

Chaos and secular cycles in a structurally simple model society

2012 ◽  
Author(s):  
Alexander Medvinsky ◽  
Alexey Rusakov
Keyword(s):  
Simple Model
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