The Experts below are selected from a list of 153 Experts worldwide ranked by ideXlab platform
Klaus A Riede - One of the best experts on this subject based on the ideXlab platform.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part ii determination of the fracture process zone with the acoustic emission technique
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract Part I of this paper showed that under biaxial Tension–compression Load the energy dissipation capacity of fibre reinforced concretes (FRC) is up to 30% lower than under uniaxial Tension Load. In this part, the extent of the fracture process zone (FPZ) was studied with the acoustic emission technique and the decrease of the energy dissipation will be explained. It was found that plain concrete specimens have generally narrower/smaller FPZ compared to FRC specimens under both uniaxial Tension and biaxial Tension–compression Load case. Under biaxial Tension–compression Load for both unreinforced and fibre reinforced specimens the FPZ tends to become slightly wider compared to the uniaxial Tension Load case. However with increasing biaxial compression stress ratios the specimens energy absorption capacity decreases. In case of biaxial Load, the bond between the fibre and the matrix zone is affected by the lateral compression stresses, resulting in a smaller FPZ compared to the uniaxial Load. This is believed to be the main reason for the lower dissipated energy.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part i test equipment and work of fracture
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract The objective of this research was to analyse the differences in the dissipated energy under uniaxial Tension and biaxial Tension–compression Load of fibre reinforced concretes using the Wedge Splitting Test. Under biaxial Load the specimens were subjected to compressive stress ratios from 10% to 50% of the concrete compressive strength perpendicular to the direction of the tensile Load. Under biaxial Tension–compression Load the energy dissipation capacity of the specimens decreases compared to the uniaxial Tension Load case on average 20–30%. It is believed that the decrease is a result of the damage mechanism of the concrete matrix and deterioration of the fibre–matrix and/or aggregate–cement paste interfaces in case the section is additionally Loaded with compression stresses. This indicates that dimensioning of concrete elements under biaxial stress states using material parameters obtained from tests conducted on specimens under uniaxial tensile Load is unsafe and could potentially lead to a non-conservative design. In the second part of this paper the extent of the fracture process zone under uniaxial Tension and biaxial Tension–compression Load will be examined with the Acoustic Emission technique and the reasons for decrease of the energy dissipation capacity under biaxial Load will be further discussed.
E K Tschegg - One of the best experts on this subject based on the ideXlab platform.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part ii determination of the fracture process zone with the acoustic emission technique
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract Part I of this paper showed that under biaxial Tension–compression Load the energy dissipation capacity of fibre reinforced concretes (FRC) is up to 30% lower than under uniaxial Tension Load. In this part, the extent of the fracture process zone (FPZ) was studied with the acoustic emission technique and the decrease of the energy dissipation will be explained. It was found that plain concrete specimens have generally narrower/smaller FPZ compared to FRC specimens under both uniaxial Tension and biaxial Tension–compression Load case. Under biaxial Tension–compression Load for both unreinforced and fibre reinforced specimens the FPZ tends to become slightly wider compared to the uniaxial Tension Load case. However with increasing biaxial compression stress ratios the specimens energy absorption capacity decreases. In case of biaxial Load, the bond between the fibre and the matrix zone is affected by the lateral compression stresses, resulting in a smaller FPZ compared to the uniaxial Load. This is believed to be the main reason for the lower dissipated energy.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part i test equipment and work of fracture
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract The objective of this research was to analyse the differences in the dissipated energy under uniaxial Tension and biaxial Tension–compression Load of fibre reinforced concretes using the Wedge Splitting Test. Under biaxial Load the specimens were subjected to compressive stress ratios from 10% to 50% of the concrete compressive strength perpendicular to the direction of the tensile Load. Under biaxial Tension–compression Load the energy dissipation capacity of the specimens decreases compared to the uniaxial Tension Load case on average 20–30%. It is believed that the decrease is a result of the damage mechanism of the concrete matrix and deterioration of the fibre–matrix and/or aggregate–cement paste interfaces in case the section is additionally Loaded with compression stresses. This indicates that dimensioning of concrete elements under biaxial stress states using material parameters obtained from tests conducted on specimens under uniaxial tensile Load is unsafe and could potentially lead to a non-conservative design. In the second part of this paper the extent of the fracture process zone under uniaxial Tension and biaxial Tension–compression Load will be examined with the Acoustic Emission technique and the reasons for decrease of the energy dissipation capacity under biaxial Load will be further discussed.
Andreas Schneemaye - One of the best experts on this subject based on the ideXlab platform.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part ii determination of the fracture process zone with the acoustic emission technique
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract Part I of this paper showed that under biaxial Tension–compression Load the energy dissipation capacity of fibre reinforced concretes (FRC) is up to 30% lower than under uniaxial Tension Load. In this part, the extent of the fracture process zone (FPZ) was studied with the acoustic emission technique and the decrease of the energy dissipation will be explained. It was found that plain concrete specimens have generally narrower/smaller FPZ compared to FRC specimens under both uniaxial Tension and biaxial Tension–compression Load case. Under biaxial Tension–compression Load for both unreinforced and fibre reinforced specimens the FPZ tends to become slightly wider compared to the uniaxial Tension Load case. However with increasing biaxial compression stress ratios the specimens energy absorption capacity decreases. In case of biaxial Load, the bond between the fibre and the matrix zone is affected by the lateral compression stresses, resulting in a smaller FPZ compared to the uniaxial Load. This is believed to be the main reason for the lower dissipated energy.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part i test equipment and work of fracture
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract The objective of this research was to analyse the differences in the dissipated energy under uniaxial Tension and biaxial Tension–compression Load of fibre reinforced concretes using the Wedge Splitting Test. Under biaxial Load the specimens were subjected to compressive stress ratios from 10% to 50% of the concrete compressive strength perpendicular to the direction of the tensile Load. Under biaxial Tension–compression Load the energy dissipation capacity of the specimens decreases compared to the uniaxial Tension Load case on average 20–30%. It is believed that the decrease is a result of the damage mechanism of the concrete matrix and deterioration of the fibre–matrix and/or aggregate–cement paste interfaces in case the section is additionally Loaded with compression stresses. This indicates that dimensioning of concrete elements under biaxial stress states using material parameters obtained from tests conducted on specimens under uniaxial tensile Load is unsafe and could potentially lead to a non-conservative design. In the second part of this paper the extent of the fracture process zone under uniaxial Tension and biaxial Tension–compression Load will be examined with the Acoustic Emission technique and the reasons for decrease of the energy dissipation capacity under biaxial Load will be further discussed.
Ildiko Merta - One of the best experts on this subject based on the ideXlab platform.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part ii determination of the fracture process zone with the acoustic emission technique
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract Part I of this paper showed that under biaxial Tension–compression Load the energy dissipation capacity of fibre reinforced concretes (FRC) is up to 30% lower than under uniaxial Tension Load. In this part, the extent of the fracture process zone (FPZ) was studied with the acoustic emission technique and the decrease of the energy dissipation will be explained. It was found that plain concrete specimens have generally narrower/smaller FPZ compared to FRC specimens under both uniaxial Tension and biaxial Tension–compression Load case. Under biaxial Tension–compression Load for both unreinforced and fibre reinforced specimens the FPZ tends to become slightly wider compared to the uniaxial Tension Load case. However with increasing biaxial compression stress ratios the specimens energy absorption capacity decreases. In case of biaxial Load, the bond between the fibre and the matrix zone is affected by the lateral compression stresses, resulting in a smaller FPZ compared to the uniaxial Load. This is believed to be the main reason for the lower dissipated energy.
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energy dissipation capacity of fibre reinforced concrete under biaxial Tension compression Load part i test equipment and work of fracture
Cement & Concrete Composites, 2015Co-Authors: E K Tschegg, Andreas Schneemaye, Ildiko Merta, Klaus A RiedeAbstract:Abstract The objective of this research was to analyse the differences in the dissipated energy under uniaxial Tension and biaxial Tension–compression Load of fibre reinforced concretes using the Wedge Splitting Test. Under biaxial Load the specimens were subjected to compressive stress ratios from 10% to 50% of the concrete compressive strength perpendicular to the direction of the tensile Load. Under biaxial Tension–compression Load the energy dissipation capacity of the specimens decreases compared to the uniaxial Tension Load case on average 20–30%. It is believed that the decrease is a result of the damage mechanism of the concrete matrix and deterioration of the fibre–matrix and/or aggregate–cement paste interfaces in case the section is additionally Loaded with compression stresses. This indicates that dimensioning of concrete elements under biaxial stress states using material parameters obtained from tests conducted on specimens under uniaxial tensile Load is unsafe and could potentially lead to a non-conservative design. In the second part of this paper the extent of the fracture process zone under uniaxial Tension and biaxial Tension–compression Load will be examined with the Acoustic Emission technique and the reasons for decrease of the energy dissipation capacity under biaxial Load will be further discussed.
Maurizio Piazza - One of the best experts on this subject based on the ideXlab platform.
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theoretical and experimental analysis of timber to timber joints connected with inclined screws
Construction and Building Materials, 2010Co-Authors: Roberto Tomasi, Alessandro Crosatti, Maurizio PiazzaAbstract:Abstract The aim of this paper is to propose a method for calculating the Load-bearing capacity and stiffness of screws placed in an inclined position with respect to the shear plane and subjected to shear–compression Load, to shear–Tension Load or to a combination due to their crossed X-position. At the same time, the authors also wish to highlight how the current method indicated by Eurocode 5 is partially unsuitable for describing the experimental results of strength and stiffness for these particular configurations. To this regard, push-out tests were carried out and the analysis of the resulting Load–displacement curves has led to the definition of the main parameters describing the mechanical behaviour of the connections: strength, stiffness, effective number, ductility. The experimental values of strength and stiffness were then compared with the theoretical ones obtained using the Eurocode 5 calculation method and the calculation method proposed in this paper.
