Failure of High Strength Concrete Under Dynamic Uniaxial Compression Advisor: Professor Xu Nie Doctor of Philosophy conferred December 21, 2019 Dissertation completed November 6, 2019 The failure strength of concrete materials has been widely shown to be dependent on experimental parameters such as specimen geometry and strain-rate.

Get PriceDec 21, 2019 The failure strength of concrete materials has been widely shown to be dependent on experimental parameters such as specimen geometry and strain-rate. The effects of specimen geometry have been shown both theoretically and experimentally to be a result of the quasi-brittle nature of concrete. While the failure strength of concrete has been widely reported to increase significantly when ...

Get PriceFigure 5.7: Strain rate history and dynamic stress equilibrium check for the test specimen during a single-loading experiment. - "Failure of High Strength Concrete Under Dynamic Uniaxial Compression"

Get PriceJan 01, 2006 The resulting high strength, reinstated ductility, as well as reduced strain hardening and strain rate hardening, lead to favorable conditions for the initiation of adiabatic shear localization, and the subsequent cracking observed for the first time in W under uniaxial dynamic compression . The UFG-W with such a deformation mode may offer a ...

Get PriceApr 01, 2011 Two important parameters in a dynamic strength model are dynamic uniaxial tensile and compressive strengths. The former controls the tensile failure (e.g. spalling, scabbing and fragmentation) while the latter is responsible for the compressive resistance (e.g. penetration and perforation) when the structure made of concrete-like materials ...

Get PriceMar 01, 2013 Dynamic biaxial tensile–compressive tests have been performed on dog-bone-shaped specimens of plain concrete under different tensile stresses and different strain rates, 100 mm × 100 mm × 100 mm cubic specimens have been adopted in the tests of dynamic uniaxial compression.All tests have been performed by using the large static–dynamic true triaxial test machine.

Get PriceCorpus ID: 213206800. Failure of High Strength Concrete Under Dynamic Uniaxial Compression @inproceedings{Loeffler2019FailureOH, title={Failure of High Strength Concrete Under Dynamic Uniaxial Compression}, author={C. Loeffler}, year={2019} }

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Get PriceJan 01, 2006 The resulting high strength, reinstated ductility, as well as reduced strain hardening and strain rate hardening, lead to favorable conditions for the initiation of adiabatic shear localization, and the subsequent cracking observed for the first time in W under uniaxial dynamic compression . The UFG-W with such a deformation mode may offer a ...

Get PriceApr 01, 2011 Two important parameters in a dynamic strength model are dynamic uniaxial tensile and compressive strengths. The former controls the tensile failure (e.g. spalling, scabbing and fragmentation) while the latter is responsible for the compressive resistance (e.g. penetration and perforation) when the structure made of concrete-like materials ...

Get PriceApr 01, 2008 Failure mode and constitutive model of plain high-strength high-performance concrete under biaxial compression after exposure to high temperatures. ... 400, 500 and 600°C, and using a large static-dynamic true triaxial machine. The biaxial tests were performed on 100 mm × 100 mm × 100 mm cubic specimens, and friction-reducing pads were used ...

Get PriceExperimental results show that the values of dynamic uniaxial compressive strength of cement and concrete are much higher than those of static uniaxial compressive strength, but decrease with ...

Get PriceSep 15, 2014 The expression for the evaluation of dynamic strength of dam and wet-screened concretes under multiaxial stress state are proposed by combining Eqs. (1), (4) as follows: τ ot d f c s = a 0 + λ lg ε. ̇. d ε. ̇. s + a 1 σ oct d f c s + a 2 σ oct d f c s 2 at θ = 0 ° (6) τ oc d f c s = b 0 + λ lg ε. ̇.

Get PriceJul 31, 2008 High strain-rate uniaxial compressive loading tests were produced in the modified split Hopkinson pressure bar (SHPB) with pulse shaper on granite samples. It was shown that the failure of the granite cylinder was typical tensile splitting failuremode by sudden splitting parallel to the direction of uniaxial compressive loading at different strain rates. Besides, it was concluded that not only ...

Get PriceJul 08, 2017 Concrete Under Uniaxial Stress Stress-Strain Curve of Hardened Concrete. The short-term properties of concrete such as elastic modulus, shear strength, tensile, compressive strength and the stress-strain characteristics are expressed in terms of the uniaxial cube compressive strength of a 15cm x 15cm cube, moist cured for 28 days.

Get PriceThe effect is here illustrated on the example of concrete cylinder of normal strength concrete (Young’s modulus Ec = 35,000 MPa, Poisson’s ratio m = 0.18, tensile strength ft = 2.25 MPa, uniaxial compressive strength fc = 23 MPa and concrete fracture energy GF = 0.08 N/mm; cylinder diameter D = 50 mm and height H = 100 mm) loaded by ...

Get PriceBased on the base force element method (BFEM), the dynamic mechanical behavior of concrete under uniaxial compression loading at different strain rates is investigated. The concrete can be considered as a three-phase composite material composed of aggregate, cement mortar, and interfacial transition zone (ITZ) on the meso-level. A two-dimensional random aggregate model is generated by the ...

Get PriceStudy on the dynamic behavior of concrete is important, for the sake of seismic design and safety evaluation of mass concrete structures, such as concrete dams, nuclear reactors and so on. There have been a lot of uniaxial strength experiment data of concrete under dynamic loading, but multiaxial data is scarce, for the test of multiaxial strength of concrete under dynamic loading is difficult ...

Get PriceMay 01, 2012 The effect is here illustrated on the example of concrete cylinder of normal strength concrete (Young’s modulus E c = 35,000 MPa, Poisson’s ratio ν = 0.18, tensile strength f t = 2.25 MPa, uniaxial compressive strength f c = 23 MPa and concrete fracture energy G F = 0.08 N/mm; cylinder diameter D = 50 mm and height H = 100 mm) loaded by ...

Get PriceFor the failure criterion of dynamic biaxial compressive strength of concrete, taking account of the influence of lateral stress ratio on concrete strength under different strain rates, Kupfer et al. proposed the biaxial ultimate compressive strength equation as: (11) f d / f c = (a + b λ) / (1 + λ) 2 where f d is the biaxial compressive ...

Get PriceExperimental results show that the values of dynamic uniaxial compressive strength of cement and concrete are much higher than those of static uniaxial compressive strength, but decrease with ...

Get PriceThe same is true of granite. For the experimental study on granite, Zhai et al. (2007) studied the dynamic fracture under uniaxial impact compressive loading, and gave an explanation of the strain ...

Get PriceTherefore, it is of interest to investigate the dynamic behavior of concrete under dynamic loading at high strain rates. Hitherto, much research based on the traditional experimental test has been conducted. Abram [3] was the ﬁrst to ﬁnd out the compressive strength of concrete and

Get Pricefailure and cracks. To overcome such defects and improve the dynamic performance of concrete against extreme loading conditions, concrete with different additions and formulae have been developed. In a recent study, to develop ultra-high performance concrete (UHPC) material with better strength and crack control ability, super fine aggregates ...

Get PriceJun 17, 2021 AbstractTo examine the uniaxial behaviors of plain concrete and lightweight aggregate concrete under dynamic loadings, the plain concrete specimens and lightweight aggregate concrete specimens prepared by shale ceramsite were designed and tested under the loading strain rate range of 10−5/s–10−2/s. The hydraulic servo machine and shear device were applied to conduct the uniaxial ...

Get PriceTo examine the uniaxial behaviors of plain concrete and lightweight aggregate concrete under dynamic loadings, the plain concrete specimens and lightweight aggregate concrete specimens prepared by shale ceramsite were designed and tested under the loading strain rate range of 10 − 5 / s – 10 − 2 / s.The hydraulic servo machine and shear device were applied to conduct the uniaxial ...

Get PriceBeyond the failure stress the formation of micro-cracks is represented macroscopically with a softening stress-strain response, which induces strain localization in the concrete structure. Under uniaxial compression the response is linear until the value of initial yield, σ c 0.

Get PriceMay 15, 2019 Abstract. In order to study the dynamic characteristics of the self-compacting lightweight aggregate concrete (SCLC) under uniaxial compression, 10 different strain rates (10 −5 –10 −1 /s) were set up to examine the uniaxial compressive dynamic performance of ordinary concrete, lightweight aggregate concrete, and SCLC, respectively. The failure modes and stress-strain curves of the ...

Get PriceMar 25, 2020 The experimental phenomena indicate the tensile failure appears in these specimens of recycled aggregate concrete (RAC) under biaxial T-C stress states. The dynamic mechanical behavior for RAC under biaxial T-C loadings was affected by the strain rates, stress ratios and its

Get PriceDec 16, 2017 Plate shaped sandstones containing two fabricated circular holes that were filled with gypsum and high-strength concrete respectively were prepared for studying the effects of ligament length L ligament incline angle α, as well as filling modes on their strength properties and failure modes. The results show that the initial cracks can be categorized as wing crack, axial tensile crack and ...

Get PriceNov 07, 2007 Although use of high-strength reinforced concrete (RC) jackets has become common practice worldwide, there are still two unresolved issues regarding the contribution of the original concrete and the effects of existing loads. Twelve RC-jacketed columns were tested with and without preloading under uniaxial compression. Tests showed the entire core to contribute to the capacity of the jacketed ...

Get PriceConcrete structures and rock engineering projects are generally in uniaxial (principal stresses σ 1 > σ 2 = σ 3 = 0), biaxial (σ 1 ≥ σ 2 > σ 3 = 0) and triaxial (σ 1 ≥ σ 2 ≥ σ 3 ≠ 0) stress states, and also frequently subjected to dynamic loads such as earthquake, high-velocity impact, drilling blasting and explosive attacks. A series of experiments is conducted on cement ...

Get PriceThe calibration of the postfailure response depends on the reinforcement present in the concrete. For plain concrete simulations the stress-displacement tension stiffening model should be used. Typical values for u 0 are 0.05 mm (2 × 10 −3 in) for a normal concrete to 0.08 mm (3

Get PriceNov 14, 2018 Because of concrete’s plasticity, compressive capacity, and durability, it is widely used in construction. Large concrete structures are impacted by static loads that change slowly and dynamic loads that change rapidly. The changes in concrete, such as failure modes, under dynamic loads are very different from those under static loads.

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