On the dynamic response of reinforced concrete beams subjected to drop weight impact

Leppänen, Joosef; Johansson, Morgan; Grassl, Peter

doi:10.1016/j.finel.2020.103438

Cited by 13 publications

(5 citation statements)

References 59 publications

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“…GOM Correlate software [32] was used in the present research for the post-processing of the images. Some authors [33][34][35] have discussed on how to define the facet mesh and post-processing key parameters for an appropriate DIC analysis of impact tests. In the present research, the facet size employed to obtain punctual displacements is 20 and 40 px (32.8 and 65.6 mm) for the falling mass and beam, respectively.…”

Section: Testing Configurationmentioning

confidence: 99%

“…In addition, some of the points were employed as reference to define digital extensometers just in the locations where shear cracks developed. As full-field strain diagrams are a useful method to assess the crack development with the help of DIC [33], a triangular mesh with a facet size of 20 px and a distance between mesh points of 9 px (14.76 mm) was employed to understand the crack evolution. In addition, it is possible to obtain other parameters (such as strains) by postprocessing the mesh displacements.…”

Section: Testing Configurationmentioning

confidence: 99%

“…With respect to previous research, where the sampling rate has been of up to 5000 fps [28,33,39], the present experimental campaign has been analyzed with a sampling rate 4.5 times higher in order to fully capture both the local and global response of the specimens. In addition, the combination of HSV-based DIC with load-cell measurements (reactions and impact force) allows for a complete experimental determination of the components of the dynamic equation of motion, as detailed in the following paragraphs.…”

Section: Experimental Derivation Of Sectional Forcesmentioning

confidence: 99%

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Time-Variation of Shear Forces Affecting the Impact Resistance of Reinforced Concrete Beams

Sánchez

Ulzurrún²

2022

hya

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One of the most hazardous scenarios for reinforced concrete (RC) members is due to the actuation of impact loads. Such impacts may be either accidental or induced events. Experimental research has demonstrated that the failure mode of RC beams is strongly governed by shear, due either to the formation of a shear plug close to the impact point or to the full development of inclined shear-bending cracks along the shear span. In order to analyze the shear strength under impact conditions, it is essential to understand how the development of inertia forces leads to a time-dependent distribution of shear forces and bending moments which differs significantly to those produced by quasi-static loads. In the paper, an experimentally-based determination of shear forces and follow-up of crack pattern is presented for RC beams tested under impact loads. A Digital Image Correlation technique supported by a high-speed camera is used to understand the evolution of shear forces at critical sections and to discuss the ultimate shear strength provided by M-V interaction diagrams.

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Section: Testing Configurationmentioning

confidence: 99%

Section: Testing Configurationmentioning

confidence: 99%

Section: Experimental Derivation Of Sectional Forcesmentioning

confidence: 99%

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Time-Variation of Shear Forces Affecting the Impact Resistance of Reinforced Concrete Beams

Sánchez

Ulzurrún²

2022

hya

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“…The PPSRC beam–column joint is constituted of concrete and steel, so it is also rate-sensitive. When subjected to dynamic loadings, the response characteristics and damage mechanism of the PPSRC beam–column joint will show obvious differences from that subjected to static or quasi-static loadings [ 34 ]. However, knowledge of the strain rate effect on the dynamic behavior of the PPSRC beam–column joint is limited, with emphasis primarily placed on the observed material dynamic mechanical properties and less attention paid to changes in the dynamic behavior of the PPSRC beam–column joint.…”

Section: Finite Element Modelmentioning

confidence: 99%

Dynamic Behavior of a Precast and Partial Steel Joint under Various Shear Span-to-Depth Ratios

et al. 2021

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The dynamic behavior of a PPSRC beam–column joint is related to constraint effect, strength deterioration and strain rate effect. Then, it can be assessed by bearing capacity, stiffness degradation, displacement ductility and energy consumption. The results show that the increased strain rate causes growth in ring stiffness, bearing capacity and energy consumption of PPSRC beam–column joints. However, the influence of shear span-to-depth ratio on dynamic mechanical properties of PPSRC beam–column joints is more obvious than that of strain rate. Regardless of strain rate, the bearing capacity, initial stiffness, ring stiffness and energy consumption of PPSRC beam–column joints decrease as the shear span-to-depth ratio increases. Moreover, the ring stiffness under reverse direction is smaller than that the under forward direction at each displacement level. However, the stiffness degradation under a lower shear span-to-depth ratio is more obvious than that under a higher shear span-to-depth ratio. Moreover, the displacement ductility with a higher shear span-to-depth ratio is better than that with a lower shear span-to-depth ratio. Finally, the mechanical properties of PPSRC beam–column joints are affected by the extension length of partial steel plate, and the reasonable extension length of the partial steel plate in the column is affected by the shear span-to-depth ratio.

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“…At present, in view of the problem that RC structures are prone to brittleness under impact loads, some researchers have increased the toughness of components by adding fibers to the concrete. Leppanen et al (2020) conducted numerical simulation of drop hammer impact test on RC beams and fiber reinforced concrete beams. The results showed that the addition of fiber reduced the crack spacing, crack width and mid-span deflection of the beam, while the reinforcement strain tended to be localized, and could be used to predict the risk rate of reinforcement fracture.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Property Test and Damage Evaluation Analysis of Steel Fiber Stainless-Steel Reinforced Concrete Beams (SFSRCBs) under Impact Load

Zhou

Wang

Deng³

et al. 2022

Lat. Am. j. solids struct.

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In this paper, the ultra-high drop hammer impact test system is adopted for the vertical impact experiment on six SFSRCBs with steel fiber volume fraction of 2.0% and build the relevant numerical model. The research variables mainly include impact energy, impact mass and cumulative impact mode. The results show that, under a single equal energy impact, with the increase of the impact speed, the crack distribution of the specimen gradually tends to the mid-span local position. Compared with the impact mass, the impact speed has a greater effect on the failure mode, deformation resistance and deformation recovery ability of SFSRCBs. When the total cumulative impact energy is the same as the single impact energy, then the overall damage of the specimen caused by high-mass low-velocity cumulative impact is less significant than that caused by low-mass high-velocity cumulative impact. Combined with the finite element analysis, the calculation formula of the maximum deflection of SFSRCB under impact load is obtained. Finally, the calculation method of the impact damage evaluation factor of SFSRCBs is proposed.

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On the dynamic response of reinforced concrete beams subjected to drop weight impact

Cited by 13 publications

References 59 publications

Time-Variation of Shear Forces Affecting the Impact Resistance of Reinforced Concrete Beams

Time-Variation of Shear Forces Affecting the Impact Resistance of Reinforced Concrete Beams

Dynamic Behavior of a Precast and Partial Steel Joint under Various Shear Span-to-Depth Ratios

Mechanical Property Test and Damage Evaluation Analysis of Steel Fiber Stainless-Steel Reinforced Concrete Beams (SFSRCBs) under Impact Load

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