scholarly journals Comparison of the result of notched three point bending test with Model Code 2010 formulas

2021 ◽  
Vol 22 ◽  
pp. 5-12
Author(s):  
Viktor Hlavicka
Keyword(s):  
Compressive Strength ◽  
Fracture Energy ◽  
Bending Test ◽  
Mechanical Parameters ◽  
Calculation Methods ◽  
Three Point Bending ◽  
Model Code ◽  
Flexural Tensile Strength ◽  
Different Types ◽  
Model Code 2010

The primary application of the notched three point bending test (3PBT) is to determine the fracture energy of concrete. However, the measurement setup is also suitable for determining additional mechanical parameters: flexural tensile strength, modulus of elasticity, and indirectly the compressive strength also. The aim of this paper is to present the calculation methods of the mechanical properties that can be determined from the results of a test series in which mixtures with different types of aggregates were used (quartz, dolomite, limestone, andesite, expanded clay). To validate the obtained results, the parameters determined from the measurements are compared to the formulas of the fib Model Code 2010. A recommendation is also presented for the calculation of the fracture energy by using compressive strength values measured on a half prism.

scholarly journals The Statistical Analysis of Relation between Compressive and Tensile/Flexural Strength of High Performance Concrete

2016 ◽  
Vol 62 (4) ◽  
pp. 95-108 ◽  
Author(s):  
M. Kępniak ◽  
P. Woyciechowski
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Influential Factors ◽  
Experimental Results ◽  
Model Code ◽  
Splitting Test ◽  
Model Code 2010

AbstractThis paper addresses the tensile and flexural strength of HPC (high performance concrete). The aim of the paper is to analyse the efficiency of models proposed in different codes. In particular, three design procedures from: the ACI 318 [1], Eurocode 2 [2] and the Model Code 2010 [3] are considered. The associations between design tensile strength of concrete obtained from these three codes and compressive strength are compared with experimental results of tensile strength and flexural strength by statistical tools. Experimental results of tensile strength were obtained in the splitting test. Based on this comparison, conclusions are drawn according to the fit between the design methods and the test data. The comparison shows that tensile strength and flexural strength of HPC depend on more influential factors and not only compressive strength.

scholarly journals Experimental study of the mechanical behavior of self-compacting concrete based on fracture mechanics

2017 ◽  
Vol 10 (3) ◽  
pp. 744-759
Author(s):  
G. O. RIBEIRO ◽  
P. C. GUETTI ◽  
P. SERNA
Keyword(s):  
Compressive Strength ◽  
Fracture Mechanics ◽  
Mechanical Behavior ◽  
Process Zone ◽  
Physical Nonlinearity ◽  
Bending Test ◽  
Maximum Diameter ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Three Point Bending

ABSTRACT Considering the physical nonlinearity of concrete and the fundamentals of fracture mechanics for quasi-brittle materials, the objective of this study was to determine the fracture energy and the length of the fracture process zone (FPZ) as well as the modulus of elasticity, the tensile strength and the compressive strength of self-compacting concrete (SCC) to characterize its mechanical behavior. A series of tests, including a three-point bending test of SCC and conventional vibrated concrete (CVC) specimens, with a notch at mid-span, and tensile and compressive tests were performed. The mechanical parameters obtained from the CVC specimens were considered as a comparative reference. The effect of the following variables was evaluated and considered at two levels: compressive strength (30 and 50 MPa), granular composition (fine and coarse particle size) and maximum diameter of the aggregate (12 and 20 mm). The effect of these variables on the mechanical behaviors of the SCC specimens was evaluated based on the test results of specimens of four types of concrete, which were obtained from the combination of the variables. The bending tests were performed according to the RILEM TC 89-FMT recommendations, which are based on the size-effect method.

Fibre Reinforced Concrete Class Control via Fib Model Code 2010 Approach

2015 ◽  
Vol 1119 ◽  
pp. 672-676
Author(s):  
Vladimir E. Rusanov
Keyword(s):  
Reinforced Concrete ◽  
Synthetic Fibre ◽  
Wide Spectrum ◽  
Basic Research ◽  
Plain Concrete ◽  
Fibre Reinforced Concrete ◽  
New Approach ◽  
Model Code ◽  
Different Types ◽  
Model Code 2010

Fibre reinforced concrete (FRC) has wide spectrum of advantages in tunnelling. Post-cracking behaviour of FRC wasn’t taken into account by Russian engineers while structural design led to underestimation of material abilities. New approach is based on fib Model Code 2010, which provides residual tensile strength Class of FRC. Research Center “FRC” (http://rcfrc.com/) carried out tests with specimens of different types of FRC, which supported by Russian Foundation for Basic Research. Research involved different specimens – plain concrete and FRC with macro-synthetic fibre of different dosage and types. The results showed the efficiency of each type of fibre. The Class of FRC was defined for each specimen series according to results.

scholarly journals Fracture Energy of Foamed Concrete Based on Three-Point Bending Test on Notched Beams

2015 ◽  
Vol 108 ◽  
pp. 349-354 ◽  
Author(s):  
Marcin Kozłowski ◽  
Marta Kadela ◽  
Alfred Kukiełka
Keyword(s):  
Fracture Energy ◽  
Bending Test ◽  
Three Point Bending ◽  
Foamed Concrete

Effect of Direct Electric Resistance Heat Treatment on Mechanical Properties of NiTi Orthodontic Arch Wires

2008 ◽  
Vol 55-57 ◽  
pp. 249-252 ◽  
Author(s):  
W. Kiattiwongse ◽  
Anak Khantachawana ◽  
P. Santiwong
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Bending Test ◽  
Electric Resistance ◽  
Bending Tests ◽  
Three Point Bending ◽  
Heat Treated ◽  
Different Types ◽  
Orthodontic Archwires ◽  
A Current

Two types of rectangular orthodontic archwires; NiTiTM and 40oCuNiTi, were heat treated by Direct Electric Resistance Heat Treatment (DERHT) using different electric currents for 4 s. Their mechanical properties were then evaluated by micro hardness and three-point bending tests. After applying 4.5-5.5 A current, the hardness of NiTiTM increased with the increased current, whereas the change in hardness of 40oCuNiTi was slight. When 6 A current was applied, the hardness of the midspan of both wires significantly decreased. From the three-point bending test, unloading forces of NiTiTM increased after treating with 5.5 A current, while those of 40oCuNiTi decreased. However, both specimens lost their superelasticity when applied with 6 A current. In conclusion, after DERHT, various changes in mechanical properties can be noted in the different types of nickel titanium archwire.

Numerical Study of Crack Propagation Path in Three-Point Bending Beam Using Extended Finite Element Method

2013 ◽  
Vol 353-356 ◽  
pp. 3615-3618 ◽  
Author(s):  
Cheng Fan ◽  
Xue Qing Jing
Keyword(s):  
Finite Element ◽  
Fracture Energy ◽  
Numerical Study ◽  
Peak Stress ◽  
Bending Test ◽  
Propagation Path ◽  
Extended Finite Element ◽  
Basic Principles ◽  
Three Point Bending ◽  
Expansion Path

This paper is based on the basic principles of the extended finite element in the large commercial software ABAQUS on the platform of different fracture energy of three point bending test of concrete are numerically simulated, and three-point bending crack initiation, through expansion path analysis. The results show that has a direct impact on the size of the fracture energy of concrete specimens destruction, Fracture of brittle fracture can be small more obvious, produce more harmful. When softening decline stage after peak stress occurred in the "jump back" phenomenon.

scholarly journals Effect of Slope Grain on Mechanical Properties of Different Wood Species

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1503 ◽  
Author(s):  
Przemysław Mania ◽  
Filip Siuda ◽  
Edward Roszyk
Keyword(s):  
Mechanical Properties ◽  
Wood Species ◽  
Maximum Load ◽  
Modulus Of Rupture ◽  
Bending Test ◽  
Mechanical Parameters ◽  
Deviation Angle ◽  
Hand Tools ◽  
Domestic Species ◽  
Three Point Bending

The aim of the presented study is to determine the relationship between mechanical parameters of selected wood species (Carya sp., Fagus sylvatica L., Acer platanoides L., Fraxinus excelsior L., Ulmus minor Mill.) used for the production of hand tools and drumsticks and the grain deviation angle from the rectilinear pattern. Modulus of rupture (MOR), modulus of elasticity (MOE), elastic strain and work to maximum load (WML) in the three-point bending test were determined. The results obtained show that the values of all the mechanical parameters measured for hickory wood are higher than those obtained for domestic species. As the grain deviation angle from parallelism increases, the mechanical properties of all analyzed wood species decrease. The greatest influence of grain deviation angle on mechanical parameters was recorded for the work to maximum load values.

scholarly journals Influence of Crimped Steel Fibre on Properties of Concrete Based on an Aggregate Mix of Waste and Natural Aggregates

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1906 ◽  
Author(s):  
Jacek Katzer ◽  
Janusz Kobaka ◽  
Tomasz Ponikiewski
Keyword(s):  
Steel Fibre ◽  
Recycled Concrete ◽  
Fibre Reinforced Concrete ◽  
Steel Fibre Reinforced Concrete ◽  
Model Code ◽  
Ultrasound Propagation ◽  
Flexural Testing ◽  
Different Types ◽  
Model Code 2010 ◽  
Natural Aggregates

This research was inspired by the growing global shortage of natural aggregates. Different types of waste ceramics (apart from recycled concrete) are the most popular materials for the production of waste aggregates as possible substitutes for natural ones. The aim of this research was to analyse the efficiency of different aggregate mixes composed of waste and natural materials focusing on two waste ceramic aggregates, which were prepared concrete mixes based on specifically composed aggregates (blend of natural aggregate, porous and iron oxide-rich (red) waste ceramic aggregate, and dense, kaolin-based (white) waste ceramic aggregate). All aggregates were thoroughly tested before utilisation for concrete mix creation. Altogether, four blends of aggregates were prepared in order to prepare concrete mixes using a simplex experiment design. The mixes were then modified by adding various amounts of crimped steel fibre. Such properties of hardened steel fibre-reinforced concrete (SFRC) such as density, compressive strength, shear strength, ultrasound propagation velocity, dynamic modulus of elasticity, and limit of proportionality during flexural testing were of special interest. Tests were conducted according to European and Japanese standards. The achieved fibre-reinforced concretes were characterised by satisfactory strength characteristics, thereby enabling the substitution of traditional reinforcement. Strength classes according to the fib Model Code 2010 were assigned.

Study of Strengthening Flat Slabs against Punching by Additional Column Heads

2016 ◽  
Vol 691 ◽  
pp. 321-332
Author(s):  
Jan Nováček ◽  
Miloš Zich
Keyword(s):  
Punching Shear ◽  
3D Fem ◽  
New Approach ◽  
Model Code ◽  
Flat Slabs ◽  
Different Types ◽  
Model Code 2010 ◽  
Rigid Connection ◽  
Flexural Reinforcement ◽  
Material And Geometric Nonlinearity

Over the past few years, punching shear has been in the forefront of both research teams and professional public due to a new approach to its verification according to Model Code 2010. From this topic, the task of flat slabs strengthening against punching shear has arisen. This problem, and in particular the problem of flat slabs strengthened by additional concrete column heads, is the focus of this paper. Structures are analysed using a 3D FEM models including material and geometric nonlinearity. The way of modelling is validated against experiments on non-strengthened flat slabs subjected to punching shear. At first, strengthening with a rigid connection at the interface between structures is considered and then, several different types of connection at the interface are evaluated. Finally, strengthening of structures with varying lengths of top flexural reinforcement in the slab is modelled while minimum anchorage length outside the additional column head is verified.

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