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Tensile behavior of rock under intermediate dynamic loading for Hwangdeung granite and Linyi sandstone
Published in Vladimir Litvinenko, Geomechanics and Geodynamics of Rock Masses: Selected Papers from the 2018 European Rock Mechanics Symposium, 2018
Yudhidyaxs Wicaksana, Seokwon Jeon, Gyeongjo Min, Sangho Cho
To indicate the increased strength under the higher strain rate loading, the results were processed in terms of dynamic increase factor (DIF) which is defined as the ratio of the dynamic strength to the referenced static strength. The data was plotted together with the data from others as can be seen in Figure 4. It showed that the slope is significantly higher at the higher strain rate. Cho et al. (2003) conducted a series of spalling test to determine the dynamic tensile strength of Inada granite. Their finding showed that tensile strength is significantly higher in dynamic loading. Kubota et al. (2008) estimated the dynamic tensile strength of Kimachi sandstone by using underwater explosive-driven method under 10–40 s−1 of strain rate. They claimed that the increase of dynamic strength and its strain rate is σd= 4.78ε0333
Tensile behavior of rock under intermediate dynamic loading for Hwangdeung granite and Linyi sandstone
Published in Vladimir Litvinenko, EUROCK2018: Geomechanics and Geodynamics of Rock Masses, 2018
Yudhidya Wicaksana, Seokwon Jeon, Gyeongjo Min, Sangho Cho
To indicate the increased strength under the higher strain rate loading, the results were processed in terms of dynamic increase factor (DIF) which is defined as the ratio of the dynamic strength to the referenced static strength. The data was plotted together with the data from others as can be seen in Figure 4. It showed that the slope is significantly higher at the higher strain rate. Cho et al. (2003) conducted a series of spalling test to determine the dynamic tensile strength of Inada granite. Their finding showed that tensile strength is significantly higher in dynamic loading. Kubota et al. (2008) estimated the dynamic tensile strength of Kimachi sandstone by using underwater explosive-driven method under 10–40 s−1 of strain rate. They claimed that the increase of dynamic strength and its strain rate is σd=4.78ε˙0.333
Effect of impact loading on bar development length in CCT node
Published in Journal of Structural Integrity and Maintenance, 2019
Hyeon-Jong Hwang, Li Zang, Gao Ma
In general, the increase of strength under dynamic loading is quantified by the dynamic increase factor (DIF), which is defined as the ratio of dynamic strength to static strength of materials. In this study, two different DIF was introduced to evaluate the effect of high strain rate on the bond strength of reinforcing bars. DIF(1) is related to the DIF of concrete compressive strength because the peak bond stress () in Equation (10d) is defined as a function of concrete compressive strength. On the other hand, DIF(2) is related to the DIF of concrete tensile strength because current design codes (ACI Committee 318, 2014; BS EN 1992:1:2004, 2004; Joint ACI-ASCE Committee 408, 2003) prescribe the bar bond strength based on to that are close to concrete tensile strength.
Numerical investigation of precast RC beam with unbonded prestressing tendon under impact loads
Published in Structure and Infrastructure Engineering, 2023
Interestingly, under the impact and explosion loads, the mechanical properties of the material will be greater than those subjected to quasi-static conditions. Due to the strain rate effect caused by impact and explosion loads, the properties of the material increase. In order to accurately express the strain rate effect of steel and concrete, the dynamic increase factor (DIF) is generally employed (Pham & Hao, 2017, 2018; Pham et al., 2018).
Assessment of performance criteria of reinforced concrete beams retrofitted with FRP fabrics subjected to extreme impulsive loading
Published in Advanced Composite Materials, 2021
M. Saloo, M.Z. Kabir, M.R. Khedmati
Dynamic Increase Factor (DIF) is defined as the ratio of dynamic resistance to the static resistance of materials. By this parameter, the effect of strain rate in concrete under compression is applied in accordance with Equations (2) and (3) provided by CEB-FIP [25].