An applicability of dynamic response analysis of shear-failure type RC beams with lightweight aggregate concrete under falling-weight impact loading

Bhatti, Abdul Qadir; Kıshı, Norimitsu; Mikami, Hiroshi

doi:10.1617/s11527-010-9621-9

Cited by 30 publications

(11 citation statements)

References 4 publications

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“…There are many factors affecting the behavior of RC members under impact loading such as the dimensions and span of members, cross-section properties (steel ratio, stirrups, concrete cover), material properties (concrete, steel, FRP) and stiffness of the impact surface, (Bhatti et al 2009(Bhatti et al , 2011Fujikake et al 2009;Ho 2004;Kishi and Mikami 2002;Kishi et al 2002Kishi et al , 2006Saatci and Vecchio 2009;Remennikov and Kaewunruen 2006). The only testing parameter in this experimental study was the strengthening effect.…”

Section: Test Specimensmentioning

confidence: 99%

AFRP retrofit of reinforced concrete columns against impact loading

Gurbuz¹,

İlki²,

Thambiratnam³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Structures can be exposed to impact loads as a result of an explosion, falling objects, projectiles and vehicle collisions. Within the increasing threat of these impact sources, it is very important to protect the columns that are the vital members of the structural systems to ensure structural and personal safety. This study focuses on the performance of axially loaded reinforced concrete members subjected to impact loading. A dropped-weight test set-up developed to perform impact tests on reinforced concrete members. The test set-up was used to perform low elevation impact tests on reinforced concrete (RC) columns that targets to simulate vehicular impact against ground floor columns of low-rise buildings. Since, there is limited information about the transverse impact performances of RC columns; the main objective of this research is to assess the vulnerability of RC columns under transverse impact loads and to enhance their performances by using Aramid Fiber Reinforced Polymer (AFRP) sheets. The scope is limited to 300 mm square columns with 3 m height in low to medium rise buildings which were found to be more vulnerable to lateral impacts according to previous research conducted by the authors, (Gurbuz et al. 2010(Gurbuz et al. , 2011. This research provides fundamental knowledge on the behavior of RC columns under low elevation impact loading and also generates new information on impact strengthening of vulnerable concrete columns by AFRP sheets.

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Section: Test Specimensmentioning

confidence: 99%

AFRP retrofit of reinforced concrete columns against impact loading

Gurbuz¹,

İlki²,

Thambiratnam³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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“…For the tension region, linear model was applied, but it was assumed that the stress cannot be transferred when a tensile pressure acted in the element reaches the breaking point. Here, the pressure is evaluated as an average of three normal stresses acted in each element and the tensile strength of concrete was assumed to be one-tenth of compressive strength similarly to the case of the numerical analysis for small-scale RC beams (Bhatti et al 2009(Bhatti et al , 2010. However, the effect of fracture energy of concrete on mesh size in the tension softening range has not been considered in this study.…”

Section: Modelling Of Materialsmentioning

confidence: 99%

Elasto-plastic dynamic response analysis of prototype RC girder under falling-weight impact loading considering mesh size effect

Bhatti

Kıshı

Konno

et al. 2012

Structure and Infrastructure Engineering

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2012) Elasto-plastic dynamic response analysis of prototype RC girder under falling-weight impact loading considering mesh size effect, Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, 8:9, 817-827, This paper focuses on an applicability of the proposed numerical analysis method to the large scale RC girder under falling-weight impact loading using effective finite element mesh size distribution by comparing with experimental results. The results obtained from this study are: (1) displacement wave can be accurately estimated with seven-division of stirrup interval. (2) The maximum impact force and reaction force can be roughly estimated by using the mesh geometry with one-division for the each interval.(3) Damping constant should be used as 1.5%. (4) Drucker-Prager yield criterion should be applied. (5) The crack patterns can be roughly estimated with seven divisions between intervals of stirrup.

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“…One-quarter model of the real girder with sand cushion is given, considering symmetry with respect to the two axes in the span and width directions. Element types used in this model are as follows: beam element for axial rebar and stirrup which are of equivalent flexural stiffness, cross-sectional areas, and unit mass with those of real bars; and 8-node solid element for all Impact Response Analysis of Prototype RC Girders the other elements (Bhatti et al, 2009(Bhatti et al, , 2011. Figure 6(b) shows finite element (FE) model for axial rebar and stirrup arranged in the RC girder.…”

Section: Overview Of Numerical Analysismentioning

confidence: 99%

“…It was assumed that (1) yield stress is equal to compressive strength f 0 c ; (2) concrete yields at 1500 mm strains; (3) the tensile stress is perfectly released when an applied pressure reaches tensile strength of concrete; (4) tensile strength of concrete is assumed to be one-tenth of compressive strength for the control mesh size in the span direction; and (5) yielding of concrete was judged based on the DruckerPrager's yield criterion (Bhatti et al, 2011).…”

Section: Concretementioning

confidence: 99%

Impact Response Analysis of Prototype RC Girders with Sand Cushion Using Equivalent Fracture Energy Concept

Bhatti

Kıshı

2011

International Journal of Damage Mechanics

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In order to establish a proper finite element model of prototype RC girder with sand element for impact response analysis, dynamic response analysis of RC girders with sand cushion subjected to impact force due to falling weight was performed to improve the state of the art of protective design for real scale rocksheds using LS-DYNA code. Here, in order to establish a modification method for material properties of concrete so as to rationally analyze the prototype RC girder with sand cushion using coarse mesh, an equivalent fracture energy concept for concrete elements was proposed and the applicability was investigated comparing numerical analysis results with experimental results. From this study, it is confirmed that even though coarse mesh was used for prototype RC girder with sand cushion, similar results with those obtained using fine mesh can be assured.

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An applicability of dynamic response analysis of shear-failure type RC beams with lightweight aggregate concrete under falling-weight impact loading

Cited by 30 publications

References 4 publications

AFRP retrofit of reinforced concrete columns against impact loading

AFRP retrofit of reinforced concrete columns against impact loading

Elasto-plastic dynamic response analysis of prototype RC girder under falling-weight impact loading considering mesh size effect

Impact Response Analysis of Prototype RC Girders with Sand Cushion Using Equivalent Fracture Energy Concept

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