Shear failure mechanism of composite concrete T-shaped beams

Halicka, Anna; Jabłoński, Ł.

doi:10.1680/stbu.14.00127

Cited by 22 publications

(19 citation statements)

References 4 publications

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“…It has been widely demonstrated that it can significantly influence on the microcracking level and surface roughness, substrate saturation level and as a consequence it may affect the bond strength between repair material and concrete substrate [3,[13][14][15][16][17][18]. The effect of surface quality on impact-echo signal was investigated for two groups of concrete substrates ( Table 1).…”

Section: Concrete Substrate Quality and Bond Strength Of Tested Repaimentioning

confidence: 99%

“…Its quality is affecting the adhesion and as a consequence reliability and durability of repair [1][2][3]. Adhesion is understood as a process through which two bodies are brought together and attachedbonded -to each other: it has therefore two different aspects, according to whether interest is mainly either in the conditions and the kinetics of contact or in the separation process [4].…”

Section: Introductionmentioning

confidence: 99%

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On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis

Garbacz

Piotrowski

Courard

et al. 2017

Construction and Building Materials

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h i g h l i g h t sConcrete substrate roughness and microcracking influence stress wave propagation. No relation between bond strength and amplitudes of frequency peaks in IE spectrum. Proposed FE model is useful for simulation of stress wave propagation in repair systems with different interface quality. Bond strength estimation with IE needs advanced signal analysis e.g. wavelet analysis. a r t i c l e i n f o b s t r a c tAccording to Concrete Repair Manual as well as ACI 562-16 and European EN 1504-10 standards, a bond strength as a measure of adhesion is one the main feature of repair system necessary to be assessed. The most common laboratory and engineering method for bond strength evaluation is pull-off test. This is however a semi-destructive method that needs a repair in a place of measurement. Recently, the great interest in nondestructive techniques (NDT) development is noted. Impact-echo (IE) is considered as one of the most promising methods for this purpose.In this paper, the study on the usability the IE test based on frequency spectrum analysis for bond strength evaluation is analyzed. Both Finite Element Method (FEM) simulation and experimental tests were performed in order to obtain potential relations between IE frequency spectrum and parameters characterizing concrete substrate quality that may affect the final bond strength and the real value of pull-off bond strength measured on samples as well. It was concluded that the IE method can be a useful tool for interface quality and bond strength evaluations in concrete repair system. However, more complex signal analysis, e.g. wavelet analysis, should be considered in the future.

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Section: Concrete Substrate Quality and Bond Strength Of Tested Repaimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis

Garbacz

Piotrowski

Courard

et al. 2017

Construction and Building Materials

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“…In the last paper of this issue, Halicka and Jabłonski (2016) present an experimental investigation of T-shaped composite concrete beams. The investigation aims to study the influence of interface location on the behaviour of beams tested; the interface is located between the flange and the web, at the midheight and at a distance of one-quarter of the height from the bottom edge.…”

Section: Structures and Buildingsmentioning

confidence: 99%

Editorial

Ashour¹

2016

Proceedings of the Institution of Civil Engineers - Structures

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and the UK, demonstrating the international reach of the journal.The first paper by Johnston et al. (2016) describes a full-scale site fire test performed on a cold-formed steel portal frame building with semi-rigid joints, complemented with finiteelement modelling. The total length of the building was 10 m, comprising five frames spaced at 2·5 m. Each frame had a span of 8 m, height to eaves of 2·2 m and pitch of 10°. The fire test was carried out by several international experts from four research institutions, namely Queen's University Belfast, Curtin University, University of Strathclyde and Ecosteel, benefitting from unique fire testing facilities at Curtin University, Malaysia. In the full-scale fire test, the building collapsed asymmetrically at a temperature of 714°C. The paper also presents the development of a non-linear elasto-plastic finiteelement shell model for the building in fire. After model validation against the results of the full-scale fire test, a comprehensive parametric study is conducted, highlighting the importance of in-plane restraint from the side rails in preventing an outwards sway failure for both a single portal and full building geometry model. The study also demonstrates the importance of modelling the semi-rigidity of various joints in design.In the second paper, Behnam and Ronagh (2016) investigate the post-earthquake fire resistance of a two-bay reinforcedconcrete portal frame. Following a post-earthquake firewall break down, the paper computationally assesses three fire exposure scenarios: only the left part of the frame exposed, only the right part of the frame exposed and the entire frame exposed. Two action scenarios are also considered; the frame is first pushed to displacement corresponding to the life safety level of performance based on FEMA356 code, followed by a natural fire curve, whereas the second assumes a fire-alone analysis to provide a point of reference. The finite-element simulation shows that no failure occurs in any of the fire-alone scenarios, or when exposing the smaller part of the building to the post-earthquake fire, but exposing the larger part and the entire frame to post-earthquake fire causes frame collapse at around 50 min and 25 min, respectively. The investigation shows the importance of firewalls to reduce vulnerability of reinforced-concrete buildings in case of postearthquake fire.The third paper by Cairns and Goodchild (2016) reports on an experimental investigation into the performance of lapped steel joints in structural concrete. The paper considers the effect of three different parameters, namely concrete cover, proportion of bars lapped at a section and relative size of bars within a lapped pair. However, the main focus of the paper is to evaluate the reduction in lap strength where minimum concrete cover, as specified by Eurocode 2, is reduced below one bar diameter. The authors conclude that lap strength is decreased by approximately 12% when the bottom cover is reduced from 1·2 to 0·6 times bar diameter. It is also found that lap ...

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“…The tests of composite beams [ 27 , 28 , 29 ] clearly show that apart from the adhesion conditions in the joint surface and the intensity of transverse reinforcement, the location of the contact at the cross-section height and the relationship between the stiffness of the base element (substrate) and the concrete overlay are important. Depending on the relation between the forces at cracking of the interface and at the shear crack formation, the failure may be initiated by cracking of the interface or proceed in the same way as in monolithic elements.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times

Gołdyn

Urban

2021

Materials

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Experimental investigations on 12 push-off specimens with dimensions of 600 × 300 × 180 mm (200 × 180 mm shear plane) were presented. Models reflected the connection between ordinary concrete (NWC) substrate and lightweight aggregate concrete (LWAC) overlay. The main purpose of the study was to investigate behaviour of the interface between concretes cast at different times. Two different interface conditions were considered: Smooth and rough (obtained by graining). In the selected elements, additional reinforcement consisting of one ∅8 bar was injected. The elements were tested under load control. The failure of the specimens without interface reinforcement was violent and resulted from breaking of the adhesive bond. Specimens with shear reinforcement failed in a ductile manner, however, due to the low reinforcement area, the residual load capacity was much lower than the load recorded just before cracking. It was found that mechanical roughening of the surface can lead to degradation of the concrete structure. As a result, the load-carrying capacities of elements with smooth interface proved to be higher than the ultimate loads of elements with deliberately roughened contacts. Comparative analysis showed that the existing design procedures ACI 318-19, Eurocode 2, Model Code 2010, and AASHTO can lead to safe but conservative estimation of the actual resistance of the concrete interface.

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Shear failure mechanism of composite concrete T-shaped beams

Cited by 22 publications

References 4 publications

On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis

On the evaluation of interface quality in concrete repair system by means of impact-echo signal analysis

Editorial

Experimental Investigations on Interface between Ordinary and Lightweight Aggregate Concretes Cast at Different Times

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