Assessing method of shear strength between old to new concrete interface under cycling loading

2021 ◽  
Vol 309 ◽  
pp. 125160
Author(s):  
Sara Cattaneo ◽  
Giacomo Zorzato ◽  
Antonio Bonati
Keyword(s):  
Shear Strength ◽  
Assessing Method ◽  
Cycling Loading ◽  
Concrete Interface

scholarly journals Effects of Cyclic Freeze–Thaw on the Steel Bar Reinforced New-To-Old Concrete Interface

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1251
Author(s):  
Tao Luo ◽  
Chi Zhang ◽  
Xiangtian Xu ◽  
Yanjun Shen ◽  
Hailiang Jia ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Concrete Structures ◽  
Freezing Temperature ◽  
Frost Damage ◽  
Freezing And Thawing ◽  
Shear Properties ◽  
Freeze Thaw ◽  
Steel Bar ◽  
Concrete Interface

Frost damage of concrete has significant effects on the safety and durability of concrete structures in cold regions, and the concrete structures after repair and reinforcement are still threatened by cyclic freezing and thawing. In this study, the new-to-old concrete interface was reinforced by steel bar. The shear strength of the new-to-old concrete interface was tested after the new-to-old combination was subjected to cyclic freeze–thaw. The effects of the diameter of the steel bar, the compressive strength of new concrete, the number of freeze–thaw cycles and the freezing temperatures on the shear properties of new-to-old concrete interface were studied. The results showed that, in a certain range, the shear strength of the interface was proportional to the diameter of the steel bar and the strength of the new concrete. Meanwhile, the shear strength of the reinforced interface decreased with the decreasing of the freezing temperature and the increasing of the number of freeze–thaw cycles.

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 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.

Evaluation of soil-concrete interface shear strength based on LS-SVM

2016 ◽  
Vol 11 (3) ◽  
pp. 361-372 ◽  
Author(s):  
Chunshun Zhang ◽  
Jian Ji ◽  
Yilin Gui ◽  
Jayantha Kodikara ◽  
Sheng-Qi Yang ◽  
...  
Keyword(s):  
Shear Strength ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Strength Based ◽  
Concrete Interface

scholarly journals Effect of Roughness on Shear Characteristics of the Interface between Silty Clay and Concrete

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Yonghong Wang ◽  
Xueying Liu ◽  
Mingyi Zhang ◽  
Xiaoyu Bai
Keyword(s):  
Shear Strength ◽  
Shear Stiffness ◽  
Test System ◽  
Engineering Practice ◽  
Silty Clay ◽  
Interface Pressure ◽  
Interface Shear ◽  
Piezoresistive Sensor ◽  
Shear Characteristics ◽  
Concrete Interface

In order to study the effect of roughness on the mechanical parameters of silty clay-concrete interface, and to explore the applicability of silicon piezoresistive sensor to test the interface pressure, a large-scale direct shear test system was used to carry out experimental research on the shear characteristics of silty clay-concrete interface under different roughness conditions. Based on silicon piezoresistive sensor, the shear characteristics of silty clay-concrete interface are analyzed. The results show that the silicon piezoresistive sensor has excellent performance in measuring the interface pressure and can accurately obtain the shear characteristics of the silty clay-concrete interface. The roughness has a significant influence on the shear strength, shear stiffness, and other mechanical properties of the prefabricated pile-soil interface. With the increase of roughness, interface shear strength, interface friction angle, shear stiffness coefficient, and interface residual shear stress all show an increasing trend, with the maximum increase of 37.0%. The interface adhesion decreased first and then increased with the increase of roughness, with an increase of 23.7%. The test results can provide reference for the engineering practice of jacked pile.

Shear strength behavior of crude oil contaminated sand-concrete interface

2017 ◽  
Vol 12 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Amirhossein Mohammadi ◽  
Taghi Ebadi ◽  
Abolfazl Eslami
Keyword(s):  
Shear Strength ◽  
Crude Oil ◽  
Strength Behavior ◽  
Concrete Interface

scholarly journals Crestbond shear connectors for load transfer in concrete filled tube columns

2018 ◽  
Vol 11 (5) ◽  
pp. 960-965
Author(s):  
O. P. AGUIAR ◽  
R. B. CALDAS ◽  
F. C. RODRIGUES ◽  
R. H. FAKURY ◽  
G. S. VERÍSSIMO
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Numerical Modeling ◽  
Shear Strength ◽  
Load Transfer ◽  
Steel Plate ◽  
Composite Beams ◽  
Shear Transfer ◽  
Shear Connectors ◽  
Concrete Interface

Abstract This paper presents an experimental study with numerical modeling of Crestbond shear connectors in concrete filled tube columns. The Crestbond, which consists in a steel plate with regular cuttings, was originally conceived for composite beams and is now being proposed as an alternative device for load introduction and shear transfer at the steel-concrete interface in concrete filled tube columns. The results achieved in this work were very favorable to the new application proposed for the connector as high values of shear strength were obtained. Moreover, the numerical and experimental results enabled comparative analysis and investigations regarding the influence of concrete conditions and the geometry of the column section on the mechanical properties of the connector.

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