Bond Properties of Ceramic Concrete Reinforced by Bamboo Bar

2013 ◽  
Vol 477-478 ◽  
pp. 920-925 ◽  
Author(s):  
Jian Zhou ◽  
Hai Ning Liu ◽  
Su Ma ◽  
Jing Jing Li ◽  
He Tao Hou
Keyword(s):  
Bond Strength ◽  
Failure Mode ◽  
Shear Failure ◽  
Constitutive Relationship ◽  
Bond Properties ◽  
Concrete Material ◽  
Pull Out ◽  
Laminated Bamboo ◽  
Relationship Of ◽  
Type Bond

Bond properties of ceramic concrete reinforced by bamboo bar were investigated based on pull-out tests. The influences of strength grade of ceramic concrete, material type, bond length, side length and notch spacing of bamboo bar on the bond strength between the bamboo bars and ceramic concrete were studied. The results show that the bond failure mode of ceramic concrete reinforced by bamboo bar without notch is majorly pulling-out failure, however, ceramic concrete reinforced by restructured bamboo (RB) bar with notch appears shear failure mode. The ultimate bond strength of ceramic concrete reinforced by RB bars is higher than that of ceramic concrete reinforced by laminated bamboo (LB) bar, which is close to that of ceramic concrete reinforced by plastic bars,but lower than that of ceramic concrete reinforced by steel bars under the same condition. When the notch spacing is 15 mm, the bond strength of ceramic concrete reinforced by RB bars is the highest. The conclusions can be usable for the the constitutive relationship of ceramic bamboo-reinforced concrete.

Investigate on Axial Load Behaviors of T-Shaped CFT Stub Columns with Binding Bars

2014 ◽  
Vol 501-504 ◽  
pp. 510-513
Author(s):  
Xin Zhi Zheng ◽  
Xin Hua Zheng
Keyword(s):  
Experimental Data ◽  
Bearing Capacity ◽  
Ultimate Strength ◽  
Failure Mode ◽  
Axial Compression ◽  
Axial Load ◽  
Constitutive Relationship ◽  
Relationship Of ◽  
Stub Columns

. Abstract. Tests on TCFT-WB, including 11 specimens with binding bars and 5 without binding bars under axial compression were carried out. The effects of parameters on the behavior of specimens such as failure mode, bearing capacity and ductility are analyzed to provide experimental data for the following research. The formula to calculate ultimate strength of TCFT-WB columns under axial compression are deduced from the constitutive relationship of TCFT-WB. The calculated results are compared with those calculated by FEM analyses, showing the proposed formula can give reasonable predictions on the ultimate strength of TCFT-WB stub columns under axial compression.

Bond Properties of Plain Steel Bar in Concrete with Machine-Made Sand

2013 ◽  
Vol 438-439 ◽  
pp. 20-24
Author(s):  
Feng Lan Li ◽  
Ke Fei Yu ◽  
Xin Xin Ding ◽  
Chang Ming Li
Keyword(s):  
Bond Strength ◽  
Experimental Studies ◽  
Bond Stress ◽  
Test Method ◽  
Bond Properties ◽  
Bond Slip ◽  
Ordinary Concrete ◽  
Strength Grade ◽  
Pull Out ◽  
Steel Bar

To meet the requirement of machine-made sand application in concrete structures, it is necessary to understand the bond properties of steel bar with machine-made sand concrete (MSC). Therefore, the experimental studies were carried out on the bond of plain steel bar with MSC by the central pull-out test method. Three specimens were cast as one group, 6 groups were tested considering the changes of strength grade of MSC and ordinary concrete. The bond-slip curves were measured and analyzed. The results show that the bond slip begins at the tensile side and transfers gradually to the free end before the entire slip turns up along the interface of plain steel bar and surrounded concrete, the largest average bond stress, i. e. the bond strength of plain steel bar corresponds to the initial entire slip of plain steel bar. With the increasing strength grade of MSC and ordinary concrete, the difference of slip at tensile side and free end becomes greater. Comparing that only appears in ordinary concrete with higher strength, the larger slips turn up while the bond stress reaches the largest for the plain steel bar in MSC. Larger scatter of bond strength is between specimens in the same group. Some plain steel bars yields with the beginning of entire slip along the interface.

scholarly journals Study On The Effect of Bond Strength On The Failure Mode of Coarse-Grained Sandstone In Weakly Cemented Stratum

2021 ◽  
Author(s):  
Xianda Yang ◽  
Lihui Sun ◽  
Jiale Song ◽  
Bensheng Yang ◽  
Chengren Lan
Keyword(s):  
Bond Strength ◽  
Failure Mode ◽  
Shear Bond Strength ◽  
Shear Failure ◽  
Shear Crack ◽  
Peak Strength ◽  
Tensile Bond Strength ◽  
Coarse Grained ◽  
Strength Ratio ◽  
Tensile Shear

Abstract Bond strength is one of the most important parameters and can affect the macroscopic mechanical properties and the damage state of the rock to some degree. The coarse-grained sandstone with strength of less than 40 MPa was studied by the controlled variable method. The influence of parallel bond strength on the peak strength and failure mode of coarse-grained sandstone was simulated, the evolution law of peak strength and failure mode of bond strength were comprehensively analyzed. The results show that the peak strength of rock was positively correlated with the bond strength, the difference value between tensile and shear crack was negatively correlated with tensile bond strength and positively correlated with shear bond strength. Tensile-shear bond strength ratio less than 0.5, the peak strength of the rock was usually stable at the certain extreme value under a constant tensile bond strength. Tensile crack was negatively correlated with the tensile-shear bond strength ratio, shear crack was positively correlated with the tensile-shear bond strength ratio. The failure mode of coarse-grained sandstone is shear failure. The research results can be used to guide the ground control of other mine stopes or roadways with weak cementation lithology.

Experimental Study and Numerical Simulation of Bond Behaviors Between FRP Bar and Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 2134-2138
Author(s):  
Xin Sheng Xu
Keyword(s):  
Bond Strength ◽  
Shear Failure ◽  
Concrete Specimen ◽  
Screw Thread ◽  
Bond Slip ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Steel Bars ◽  
Frp Bar ◽  
Frp Bars

Surface-adhering-sand screw-thread-form FRP bar was produced. By symmetrical pull-out test research to a certain depth in FRP (Fiber Reinforced Polymer) bar concrete, the bond mechanism, the failure mechanism, the bond strength and the slip of FRP bar to concrete were studied systematically. Studies show that the failure mode is not the damage of the ribs or the shearing off of the ribs, but is shear failure between the screw thread and the core of the FRP bar, and the sands on the surface of the bar were grinded into powder. The descending branch of load-slip curve for the FRP bars is gentler than that for the steel bars. The bond strength of FRP bars is a little lower than that of steel bars, but higher than smooth FRP bar greatly. At last the FRP bar concrete specimen were modeled in ANSYS program and the simulation result is satisfactory, which proves the feasibility to model the behavior of bond-slip relationship between FRP bar and concrete accurately.

scholarly journals Failure Mode Prediction of Resistance Spot Welded Quenching and Partitioning Steel

2019 ◽  
Vol 269 ◽  
pp. 03002 ◽  
Author(s):  
Cheng Luo ◽  
Yansong Zhang
Keyword(s):  
Tensile Strength ◽  
Failure Mode ◽  
Fusion Zone ◽  
Base Metal ◽  
Image Correlation ◽  
Constitutive Relationship ◽  
Quenching And Partitioning ◽  
Lap Shear ◽  
Relationship Of ◽  
Spot Welded

In recent years, a novel Advanced High-Strength Steels called quenching and partitioning (Q&P) steel has been applied in the automotive industry because its good combination of strength and ductility. In this study, an experimental setup by adopting digital image correlation (DIC) method was firstly developed to establish the constitutive relationship of fusion zone in the spot welds produced by Q&P980. Stress-strain relationship extracted from the tensile bar within the fusion zone and compared the results to that of base metal. The fusion zone of Q&P980 found to have a higher tensile strength and similar elongation compared with base metal. A numerical model established to predict the failure mode of joints generated by Q&P980 after obtaining the constitutive relationship of fusion zone. The predicted failure mode was in good coherence with the experimental results under the lap-shear test conditions. The developed FE model was proven efficient in tensile strength and failure mode characterization of spot welded specimen. This study could provide solutions to maintain or even improve vehicle crashworthiness of lightweight vehicle structures.

scholarly journals Sidewall Thickening as Strengthening for Box-Section Laminated Bamboo Beam under Transverse Load in Shear Failure Mode

2019 ◽  
Vol 16 (3) ◽  
pp. 129-134
Author(s):  
Karyadi Karyadi ◽  
Elvan Wahyu Arlian Basuki ◽  
Prijono Bagus Susanto ◽  
Nindyawati Nindyawati
Keyword(s):  
Failure Mode ◽  
Shear Failure ◽  
Transverse Load ◽  
Box Section ◽  
Laminated Bamboo

scholarly journals Effect of casting direction on bond of reinforcement in High Performance Self-Compacting Concrete (HPSCC)

2019 ◽  
Vol 262 ◽  
pp. 06004 ◽  
Author(s):  
Piotr Dybeł
Keyword(s):  
Bond Strength ◽  
High Performance ◽  
Bond Stress ◽  
Concrete Mixture ◽  
Experimental Program ◽  
Bond Properties ◽  
Self Compacting Concrete ◽  
Pull Out ◽  
Significant Change ◽  
Bond Characteristics

This paper presents the results of an investigation into the steel-to-concrete bond in high-performance self-compacting concrete (HPSCC) based on direct pull-out tests. Specifically, the effect of the casting direction on bond properties is examined. Two variants of concrete mixture casting were considered in this work: from the top and from the bottom of a mould with a single casting point at one edge. Horizontal specimens with transverse rebars distributed over their heights (480 mm) and lengths (1600 mm) were cast. The experimental program has shown that the direction of concreting plays an important role in the formation of the bond condition. In the case of casting a mixture from the bottom of a mould, in the lower part of a specimen there is no significant change of the bond stress. However, there is a strong improvement in the upper part. The phenomenon observed eliminates the top-bar effect. What is more, for the rebars situated in the upper part of a specimen, improvements in bond characteristics, such as the bond stiffness, bond strength and the effect of the rebar distance from the casting point are all observed in the case of casting a mixture from the bottom of a mould.

scholarly journals Study on the Effect of Bond Strength on the Failure Mode of Coarse-Grained Sandstone in Weakly Cemented Stratum

Minerals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 55
Author(s):  
Xianda Yang ◽  
Lihui Sun ◽  
Jiale Song ◽  
Bensheng Yang ◽  
Chengren Lan ◽  
...  
Keyword(s):  
Bond Strength ◽  
Failure Mode ◽  
Shear Bond Strength ◽  
Shear Failure ◽  
Peak Strength ◽  
Tensile Bond Strength ◽  
Coarse Grained ◽  
Strength Ratio ◽  
Shear Cracks ◽  
Tensile Shear

Bond strength is one of the most important parameters and can affect the macroscopic mechanical properties and the damage state of rock to some degree. Coarse-grained sandstone was studied using the controlled variable method. The influence of parallel bond strength on the peak strength and failure mode of coarse-grained sandstone was simulated, and the evolution law of peak strength and the failure mode of bond strength were comprehensively analyzed. The results show that the peak strength of the rock was positively correlated with the bond strength; the difference in quantity between the tensile and shear cracks was negatively correlated with tensile bond strength and positively correlated with shear bond strength. With a tensile-shear bond strength ratio of less than 0.5, the peak strength of the rock was usually stable at the certain extreme value under a constant tensile bond strength. The tensile cracks were negatively correlated with the tensile-shear bond strength ratio, and the shear cracks were positively correlated with the tensile-shear bond strength ratio. The main failure mode of the coarse-grained sandstone in the weakly cemented stratum of the Hongqinghe coal mine is shear failure. The research results can be used to guide the ground control of other mine stopes or roadways with weak cementation lithology.

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