Formulation of Orthotropic Constitutive Model for Concrete Materials Under High Strain-Rates and Triaxial Stress States

Fujikake, Kazunori; Uebayashi, Katsutoshi; Ohno, Tomonori; Mizuno, Jun; Suzuki, Atsushi

doi:10.2208/jscej.2001.669_109

Cited by 16 publications

(10 citation statements)

References 15 publications

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“…In order to predict the relationship between the DIF and loading rate (or strain rate), many researchers have conducted rate sensitivity tests and proposed empirical models [41,42]. These models are well summarized in Salloum’s study [42].…”

Section: Resultsmentioning

confidence: 99%

Dynamic Pullout Behavior of Multiple Steel Fibers in UHPC: Effects of Fiber Geometry, Inclination Angle, and Loading Rate

2019

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This study examined the influences of fiber geometry, inclination angle, and loading rate on the pullout behavior of multiple steel fibers in ultra-high-performance concrete (UHPC). For this, two different steel fiber types, i.e., straight (S-) and hooked (H-), four different inclination angles (0°–60°), and four different loading rates (0.018 mm/s to 1200 mm/s) were considered. Test results indicated that the pullout performance of S-fibers in UHPC was improved by increasing the loading rate. The highest maximum pullout load of the S-fiber was obtained at the inclination angle of 30° or 45°. The maximum pullout loads of H-fibers also increased with increases in the loading rate, while their slip capacities rather decreased. No specific inclination angle was identified in the case of H-fibers that caused the highest maximum pullout load. The H-fibers yielded higher average bond strengths than S-fibers, but similar or even smaller pullout energies under the impact loads. The aligned S-fiber in UHPC was most sensitive to the loading rate compared to the inclined S-fiber and aligned H-fiber. The rate sensitivity became moderate with the fiber inclination angle. Consequently, the aligned S-fiber was recommended to achieve the best energy absorption capacity and interfacial bond strength at various impact loads.

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Section: Resultsmentioning

confidence: 99%

Dynamic Pullout Behavior of Multiple Steel Fibers in UHPC: Effects of Fiber Geometry, Inclination Angle, and Loading Rate

2019

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“…Since the yield stress of the linear model becomes larger for the hydrostatic stress state than that of the non-linear model, material with the linear model is hard to yield. According to a study on the mechanical properties of concrete under the tri-axial stress state [3], the failure criterion of concrete under www.witpress.com, ISSN 1743-3509 (on-line) the tri-axial compressive stress state is similar to the non-linear model. Thus, the results by this simulation may be appropriate.…”

Section: Results By Numerical Simulationmentioning

confidence: 99%

“…In impact tests, the strain rate can be inferred 10 -1~1 0 2 (1/s) from the fact that the failure process was completed at most within 1.0ms as shown in Figure 8 and concrete was damaged at hundreds to several thousand micro strain. The equation of increase of the dynamic compressive strength of concrete is proposed by Fujikake et al [3] as given in Eq. (1): In this numerical simulation, the test cases are shown in Table 3.…”

Section: Materials Modelmentioning

confidence: 99%

Testing and simulation of local damage in a concrete plate by the impact of a hard projectile

Miwa¹,

Beppu²,

Ohno³

et al. 2006

WIT Transactions on the Built Environment, Vol 87

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This study is to investigate the mechanism of local damage in a concrete plate by the impact of hard projectile with a hemisphere-nose. Thus, to execute the experimental study, testing apparatus for launching the projectile was newly developed. Using this apparatus, a projectile with the mass of 100g is shot by at a velocity of about 500m/s. In this test, the relation between the impact velocity and the penetration depth and crater diameter were examined. The impacting appearance was recorded by a high-speed video camera, and then analyzed. Also, to find the mechanism of local damage in concrete, a numerical simulation by AUTODYN was performed.

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“…Dynamic increase factor (DIF) shows the change degree of impact strength with strain rate and it is defined as DIF=fcd/fcs, where fcd is impact strength and fcs is static strength. Scholars have proposed some expressions to describe the DIF and strain rate relationship, as given in Equations (4)–(8) [32,35,36,37,38,39]. After comparison, the linear expression Equation (6) was finally chosen in this study and the results are given in Figure 13 and Table 5.…”

Section: Discussionmentioning

confidence: 99%

Effect of Fiber Hybridization, Strain Rate and w/c Ratio on the Impact Behavior of Hybrid FRC

et al. 2019

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Concrete in practical applications has to inevitably suffer various impact loads. Recent research indicates that the hybrid fiber reinforced concrete (FRC) has better dynamic mechanical properties compared to the mono FRC under impact loading. Based on macro-experimentation and micro-observation, the impact behavior of the hybrid basalt-macro synthetic polypropylene FRC (BSFRC) was investigated by using ∅74 mm SHPB, SEM, and EDS. The effects of fiber hybridization, strain rate, and w/c ratio were analyzed simultaneously. The results show that the dynamic mechanical properties of BSFRC are strain-rate sensitive. Both basalt and macro synthetic polypropylene fibers (BF, SF) have a strengthening and toughening effect on concrete. Their hybridization has a similar enhancement effect but the impact toughness of concrete is further improved and the best hybrid ratio is 0.05%(BF)–0.25%(SF). BSFRC with higher w/c ratio has a higher strain rate effect while the fiber hybridization effect is weakened. Besides, the proposed constitutive model can well describe the impact behavior of BSFRC. The hydration of cement in the interface transition zones is lower with more Calcium Silicate Hydrate and less Ca ( OH ) 2 than that in the common mortar. However, the addition of BF and SF contributes to the hydration of cement and improves the performance of concrete eventually.

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Formulation of Orthotropic Constitutive Model for Concrete Materials Under High Strain-Rates and Triaxial Stress States

Cited by 16 publications

References 15 publications

Dynamic Pullout Behavior of Multiple Steel Fibers in UHPC: Effects of Fiber Geometry, Inclination Angle, and Loading Rate

Dynamic Pullout Behavior of Multiple Steel Fibers in UHPC: Effects of Fiber Geometry, Inclination Angle, and Loading Rate

Testing and simulation of local damage in a concrete plate by the impact of a hard projectile

Effect of Fiber Hybridization, Strain Rate and w/c Ratio on the Impact Behavior of Hybrid FRC

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