Shear-friction behavior of concrete-to-concrete interface under direct shear load

2021 ◽  
Vol 238 ◽  
pp. 112211
Author(s):  
Jin Xia ◽  
Kuang-yi Shan ◽  
Xiao-hui Wu ◽  
Run-li Gan ◽  
Wei-liang Jin
Keyword(s):  
Shear Load ◽  
Direct Shear ◽  
Friction Behavior ◽  
Shear Friction ◽  
Concrete Interface

scholarly journals Pile Side Resistance in Sands for the Unloading Effect and Modulus Degradation

2019 ◽  
Vol 69 (334) ◽  
pp. 185 ◽  
Author(s):  
C. F. Zhao ◽  
Y. Wu ◽  
C. Zhao ◽  
Q. Z. Zhang ◽  
F. M. Liu ◽  
...  
Keyword(s):  
Shear Stress ◽  
Maximum Amount ◽  
Interface Roughness ◽  
Direct Shear ◽  
Shear Tests ◽  
Interface Shear ◽  
Direct Shear Tests ◽  
Side Resistance ◽  
Unloading Effect ◽  
Concrete Interface

A total of 36 groups of sand-concrete interface loading and unloading direct shear tests were used to analyze the mechanical properties of the pile side-soil interface. The test results show that the interface residual shear stress for the same applied normal stress tends to be constant for the rough sand-concrete interface. The initial shear modulus and peak shear stress of the interface both decrease with the degree of unloading and increase with the interface roughness. The maximum amount of interface shear dilatancy increases with the degree of unloading, and the maximum amount of interface shear shrinkage decreases with unloading for the same interface roughness. A pile side resistance-displacement model is established using the shear displacement method. The proposed function considers both the radial unloading effect and modulus degradation of soil around the pile. The effect of radial unloading and interface roughness on the degradation of the equivalent shear modulus is analyzed using a single fitting parameter b. Good agreement of the proposed model is confirmed by applying the direct shear tests of the 36 groups.

Effect of High-Strength Reinforcement Steel on Shear Friction Behavior

2017 ◽  
Vol 22 (8) ◽  
pp. 04017038 ◽  
Author(s):  
Andre R. Barbosa ◽  
David Trejo ◽  
Drew Nielson
Keyword(s):  
High Strength ◽  
Friction Behavior ◽  
Reinforcement Steel ◽  
Shear Friction

scholarly journals Numerical and experimental analysis of the behavior of structural elements composed of double lattice panels filled with cast-in-place concrete

2015 ◽  
Vol 8 (4) ◽  
pp. 467-478
Author(s):  
B. M. LACERDA ◽  
M. C. V. LIMA ◽  
F. A. R. GESUALDO ◽  
V. C. CASTILHO
Keyword(s):  
Shear Strength ◽  
Structural Model ◽  
Experimental Program ◽  
Direct Shear ◽  
Structural Elements ◽  
Ansys Software ◽  
Geometric Ratio ◽  
Solid Finite Elements ◽  
Concrete Filling ◽  
Concrete Interface

AbstractAn experimental and numerical investigation was conducted into the factors that interfere in the shear strength of the concrete-concrete interface in structures composed of double lattice panels subjected to direct shear stress. The experimental program consisted of testing 26 direct shear models with varying widths of concrete filling of 7 cm, 9 cm and 13 cm, with smooth and rough interfaces, as well as different concrete compressive strengths in the filled region. The numerical modeling, which was performed with ANSYS software, employed solid finite elements, bar elements and contact elements, taking into account the non-linearity of the materials involved. The analyses of the experimental results under direct shear indicated that the transfer of stresses at the interface occurred with loss of adhesion. The numerical simulations indicated that the higher the geometric ratio of reinforcement the higher the direct shear strength of the structural model. In general, the slip of the models with smooth interfaces was 2 or 3 times greater than the models with rough surfaces. Numerically, the models with smooth interfaces showed a 36.61% gain in shear strength when the compressive strength in the region filled with concrete increased from 20 MPa to 28.4 MPa.

scholarly journals Shearing Behavior of Tire-Derived Aggregate with Large Particle Size. I: Internal and Concrete Interface Direct Shear

2017 ◽  
Vol 143 (10) ◽  
pp. 04017078 ◽  
Author(s):  
Ismaail Ghaaowd ◽  
John S. McCartney ◽  
Stuart S. Thielmann ◽  
Michael J. Sanders ◽  
Patrick J. Fox
Keyword(s):  
Particle Size ◽  
Large Particle ◽  
Direct Shear ◽  
Large Particle Size ◽  
Tire Derived Aggregate ◽  
Concrete Interface

scholarly journals Some Aspects of Shear Behavior of Soft Soil–Concrete Interfaces and Its Consequences in Pile Shaft Friction Modeling

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2578
Author(s):  
Jakub Konkol ◽  
Kamila Mikina
Keyword(s):  
Shear Strength ◽  
Normal Load ◽  
Soft Soil ◽  
Load Condition ◽  
Initial Stiffness ◽  
Friction Modeling ◽  
Interface Failure ◽  
Friction Behavior ◽  
Constant Normal Load ◽  
Concrete Interface

This paper examines the stiffness degradation and interface failure load on soft soil–concrete interface. The friction behavior and its variability is investigated. The direct shear tests under constant normal load were used to establish parameters to hyperbolic interface model which provided a good approximation of the data from instrumented piles. Four instrumented piles were used to obtain reference soil–concrete interface behavior. It was found that the variability of the friction characteristics is the highest for organic clays and the lowest for organic silts. The intact samples exhibit lower shear strength than reconstituted ones. The adhesion varies significantly depending on interface and soil type, which can result in high scatter of the skin friction prediction. The analysis of parameters variability can be used to determine the upper and lower bound of friction behavior on the interface at constant normal load condition. The backward shearing results in decrease in shear strength up to 40% of the precedent forward phase but higher initial stiffness by a factor of between 2 and 3. Presented research provides basic shear and stiffness parameters for four soft soils (organic clay, organic silt, peat, and silty loam) and gives information about variability of interface characteristics.

scholarly journals Appraisal of Anchor Arrangement and Size On Sand-Geogrid Interaction In Direct Shear

2021 ◽  
Author(s):  
Mahmood Reza Abdi ◽  
Mehdi PourRamezan Chafjiri
Keyword(s):  
Normal Pressure ◽  
Soil Reinforcement ◽  
Shear Load ◽  
Direct Shear ◽  
Shear Surface ◽  
Analysis And Design ◽  
Reinforced Earth ◽  
Earth Structures ◽  
Shear Box ◽  
Reinforcement Interaction

Abstract Soil – reinforcement interaction is a major factor in the analysis and design of reinforced earth structures. In current research the effects of attaching elements of different size and numbers as anchors on enhancement of interaction at soil - geogrid interface under direct shear conditions were studied. Poorly and well graded sands (SC & Sf), a high density polyethylene geogrid, anchors with three different size and numbers (layouts) and clamping length of 2cm from shear surface were used. Samples were prepared dry at a relative density of 80% in a 30×30cm direct shear box and subjected to normal pressures of 12.5, 25 and 50kPa with the shear load applied at a rate of 1mm/min. Results of the assessment show that anchored geogrids improve shear resistance at interface mainly due to mobilization of passive soil resistance that is significantly influenced by the magnitude of the normal pressure and the number and size of anchors. Interaction enhancements achieved varied between a minimum of 8% and a maximum of 42%.

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