Influence new-to-old concrete interface qualities on the behaviour of support zones of composite concrete beams

Halicka, Anna

doi:10.1016/j.conbuildmat.2011.04.045

Cited by 35 publications

(26 citation statements)

References 4 publications

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“…Most previous researches [2]- [5] about the PC-CIP composite members have been focused on horizontal shear strength rather than vertical shear strength because monolithic behavior of composite members is the most critical factor to resist flexure and shear. The effect of surface smoothness, shear span-to-depth ratio, shear reinforcement, height of surfaces, and concrete strength on the horizontal shear strength of composite beams was investigated by Seamann et al [2], Loov [3], Kahn [4] and Halicka [5]. However, due to aforementioned shear design problem, vertical shear strength of composite members should be researched in the case of using quite different concrete strengths.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Composite Beams with Dual Concrete Strengths

Kim¹,

Park²,

Hong³

et al. 2016

ACI Structural Journal

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Currently, in precast concrete constructions, precast and cast-in-place concrete with different concrete strengths are used in a composite structural member. However, current design codes are not obvious for calculating the vertical shear strength of PC-CIP composite members using dual concrete strengths. In the present study, shear strength of composite beams using dual concrete compressive strengths (24MPa, 60MPa) was tested. The test variables were the section area ratio of two type concretes, flexural reinforcement ratio, and shear span-to-depth ratio.

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Section: Introductionmentioning

confidence: 99%

Shear Strength of Composite Beams with Dual Concrete Strengths

Kim¹,

Park²,

Hong³

et al. 2016

ACI Structural Journal

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“…All these methods have been proven efficient in enhancing the load capacity and the ductility of elements [7]. In all cases, the shear transfer mechanisms of the interface affect the transferring of loads and the effectiveness of the retrofit method, constituting its design crucial and of high interest [8], [9]. More specifically, in cases of strengthening with RC jacketing the main mechanisms that act are concrete-toconcrete cohesion and friction (aggregate interlock) and dowel action of the reinforcement the interface between old and new concrete (dowels, tack-welds, butt-welds, bend down bars etc.…”

Section: Introductionmentioning

confidence: 99%

Study of the Behavior of Rc Columns Strengthened With Rc Jackets Containing Dowels and Different Confinement Ratios.

Achillopoulou¹,

Tasiopoulos²,

Karabinis³

2014

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The current paper studies the force transfer mechanisms in retrofitted columns containing dowels crossing the interface of old and new concrete. It includes 10 specimens of square section (150x150x500mm) of 24,37 MPa nominal concrete strength with 4 longitudinal steel bars of 8mm diameter (500 MPa nominal strength) and different transverse reinforcement ratios (ω c = 0,075, ω c =0,15 ). All columns were subjected to initial axial compression up to maximum load. After repair with thixotropic high strength concrete, all columns were retrofitted with RC jacket of 80mm width of 31,8 MPa concrete strength, including 4 longitudinal bars of 8mm diameter (500 MPa nominal strength) and different confinement ratios(ω cj = 0,035/0,071/0,142 ). The retrofitted columns contain dowel bars of either 10 or 14mm diameter that cross the interface. Two loading patterns were selected to test the strengthened columns, the behavior of which is investigated through P-δ, energy absorbed diagrams and the levels of ductility achieved. The results indicate that the initial damages affect the total behavior of the column and the capacity of the interface to shear mechanisms and to slip: a) the maximum bearing load of old column is decreased affecting at the same time the loading capacity of the jacketed element, b) suitable repair of initially damaged specimens increases the capacity of the jacketed column to transfer load through the interface.

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“…Recently, the study of the interphase zone between the overlay and concrete substrate mainly consisted of macroscopic investigations using the previously mentioned "adhesion maps", which were created with the use of the pull-off method [8,9] or by testing the interphase zone between large-scale concrete elements using bending [10,11], shear [12,13] and flexural strength [14][15][16]. Rough "adhesion maps" were also made based on results obtained using impact-echo and ultrasonic echo methods [17].…”

Section: Literature Reviewmentioning

confidence: 99%

Multi-Scale Evaluation of the Interphase Zone between the Overlay and Concrete Substrate: Methods and Descriptors

Sadowski

2017

Applied Sciences

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This article presents the problem of examining the interphase zone between the overlay and concrete substrate at different levels of observation. The possibility of applying available modern research methods in order to examine the interphase zone with regard to the level of observation is presented. These levels were defined in the paper. Examples of tests that show a possible approach to the examination of the interphase zone are also presented.

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Influence new-to-old concrete interface qualities on the behaviour of support zones of composite concrete beams

Cited by 35 publications

References 4 publications

Shear Strength of Composite Beams with Dual Concrete Strengths

Shear Strength of Composite Beams with Dual Concrete Strengths

Study of the Behavior of Rc Columns Strengthened With Rc Jackets Containing Dowels and Different Confinement Ratios.

Multi-Scale Evaluation of the Interphase Zone between the Overlay and Concrete Substrate: Methods and Descriptors

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