Experimental and numerical study on dynamic properties of RC beam

Li, Hong‐Nan; Li, Min

doi:10.1680/macr.12.00198

Cited by 13 publications

(6 citation statements)

References 11 publications

(10 reference statements)

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“…According to the actual needs, different dynamic constitutive models can be selected for the strain rate effect of steel. In this study, the dynamic tensile constitutive model of steel provided in Reference [17] is selected, as shown in the following formulas.…”

Section: Strain Rate Effect Of Steelmentioning

confidence: 99%

“…Mahin and Bertero [15] along with Li and Li [16] experimentally studied the strain rate effect of reinforcing steel under cyclic loading and found that the yield strength of the reinforcing steel increases with an increasing loading rate. Li and Li [17], Wang et al [18], and Carrillo and Alcoce [19] carried out experimental tests to investigate the dynamic mechanical properties of RC beams, columns, and shear walls. The results showed that the loading rate affects the energy dissipation, stiffness, and strength of RC members to certain extents.…”

Section: Introductionmentioning

confidence: 99%

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Fragility Analysis of Concrete-Filled Steel Tubular Frame Structures with BRBs under Multiple Earthquakes Considering Strain Rate Effects

Zhang

Jiang

et al. 2019

Applied Sciences

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The fragility of concrete-filled steel tubular (CFST) frame structures with buckling-restrained braces (BRBs) subjected to multiple earthquakes is studied in this paper. First, a fiber beam element model with rate-dependent concrete and steel material properties is developed for CFST members and, then, the effect of the strain rate on the seismic response of the CFST frame structure is investigated numerically. The influence of BRBs on the seismic response of the CFST frame structure is then comparatively analyzed. The seismic responses of the CFST frame structure with BRBs under single mainshocks and earthquake sequences are investigated, and the fragility curves are generated using probabilistic seismic demand analysis. The obtained roof displacement and inter-story drift ratio (ISDR) of the structure decreased by 10.2% and 6.9%, respectively, when obtained while considering the strain rate effect, compared with those obtained without consideration of the strain rate effect. BRBs can effectively improve the seismic performance of the CFST frame structure in that the maximum roof displacement and ISDR can be reduced by 45.1% and 43.9%, respectively. Compared with those under single mainshocks, the maximum roof displacement and ISDR of the structure with BRBs under earthquake sequences significantly increase. The fragility of the BRB structure under earthquake sequences is more severe than that under single mainshocks. Therefore, the influences of the strain rate effect and earthquake sequence should be considered to realistically evaluate the seismic fragility of CFST structures.

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Section: Strain Rate Effect Of Steelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fragility Analysis of Concrete-Filled Steel Tubular Frame Structures with BRBs under Multiple Earthquakes Considering Strain Rate Effects

Zhang

Jiang

et al. 2019

Applied Sciences

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“…the tangent modulus) is 1% of Young’s modulus. Similar with those of concrete, the elastic modulus and the strain at the maximum stress are less sensitive to the strain-rate variations (Li and Li, 2013). The effect of loading rate on the yield strength and ultimate strength was also presented by the DIF.…”

Section: Fe Simulationmentioning

confidence: 99%

Experimental and numerical study of reinforced concrete beams with steel fibers subjected to impact loading

Jin

Zhang

Dou

et al. 2017

International Journal of Damage Mechanics

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As a kind of impact resistant material, steel fiber reinforced concrete (SFRC) has a good ductility and energy dissipation capacity by improving the tensile strength and impact toughness. To explore the dynamic mechanical behavior of SFRC beams subjected to impact loading, 12 simply-supported SFRC beams with different stirrup ratios (0%, 0.253% and 0.502%) and different volume fractions of steel fibers (0%, 1%, 2% and 3%) were tested with free-falling drop-weights impacting at the mid-span of specimens. The failure patterns were observed and videoed, and simultaneously, the time histories of the impact force, the reaction force, and the mid-span deflection were recorded. Moreover, the influences of stirrup ratio and volume fraction of steel fibers on the impact resistant behavior of the SFRC beams were preliminarily analyzed and discussed. The results indicate that the impact resistant performance of SFRC beams, such as crack pattern, ductility, energy consumption capacity, and deformation recovery capacity can be improved by the addition of steel fibers and stirrups. The required static capacity of these beams were calculated based on the analysis of reaction force vs. displacement loop and impact force vs. displacement loop as well as absorbed energy ratio. For further understanding the experimental results, finite element simulation of SFRC beams subjected to impact loading were carried out. The rationality and accuracy of the finite element model was illustrated by the good agreement between the test observations and the numerical results.

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“…Results show that strength reserve of the structure system is experienced when the strain rate effect is accounted for. Li et al investigated the influence of loading rate on the bearing ability, ductility, stiffness, failure mode, and energy absorption of beam specimens by conducting dynamic tests [11]. e dynamic behaviors of columns were studied by Wang et al [12].…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Effect on the Progressive Collapse Analysis of RC Frame Structure under Earthquake

Wen-ming

2020

Advances in Civil Engineering

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The strain rate effect can influence the seismic responses of reinforced concrete (RC) structures because the constitutive relationship of concrete and rebar is rate-dependent. This paper carries out progressive collapse analysis to research the influence of strain rate effects on collapse-resistant capacity, collapse mode, and collapse path of the RC frame structure. A progressive collapse simulation program for the reinforced concrete (RC) structure with a static and dynamic constitutive relationship is coded individually using the user subroutine VUMAT and then implemented in the advanced finite element program ABAQUS. The good agreement between experimental and simulation results proves that the coded subroutine is reliable. With the coded subroutine, by conducting progressive collapse analyses of a four-story RC frame structure under earthquake, the effect of strain rate on the response is investigated. The numerical results demonstrate that the collapse-resistant capacity of the structure is underestimated when the strain rate effect is neglected. It is shown that strain rate effects influence the collapse mode and collapse path of the structure. Therefore, strain rate effects should be considered in the progressive collapse analysis of the RC frame structure.

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Experimental and numerical study on dynamic properties of RC beam

Cited by 13 publications

References 11 publications

Fragility Analysis of Concrete-Filled Steel Tubular Frame Structures with BRBs under Multiple Earthquakes Considering Strain Rate Effects

Fragility Analysis of Concrete-Filled Steel Tubular Frame Structures with BRBs under Multiple Earthquakes Considering Strain Rate Effects

Experimental and numerical study of reinforced concrete beams with steel fibers subjected to impact loading

Strain Rate Effect on the Progressive Collapse Analysis of RC Frame Structure under Earthquake

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