Articles in SCI-Expanded

Aygul, Ceylan, Girgin, Z.C,, "Comparisons on withdrawal resistance of resin and phosphate coated annular ring nails in CLT specimens", Construction and Building Materials, 238 (2020) 117742.

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Girgin, Z.C,, “Effect of slag, nano clay and metakaolin on mechanical performance of basalt fibre cementitious composites”, Construction and Building Materials, Vol. 192, Dec 2018, pp.70-84. 
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Girgin, Z.C, Tak,Yıldırım, M., “Usability of Basalt Fibres in Fibre Reinforced Cement Composites”, Materials and Structures, Vol. 49, Issue 8, 2016, pp.3309-3319.
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Girgin, Z.C., Girgin, K., “Design-Oriented Combined Model (7 MPa to 190 MPa) for FRP-Confined Circular Short Columns”, Polymers, Oct. 2015, pp.1915-1917.
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Girgin, Z.C., “Modified Johnston Failure Criterion from Rock Mechanics to Predict the Ultimate Strength of Fiber Reinforced Polymer (FRP) Confined Columns”, Polymers, Jan. 2014, pp.59-75.
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Girgin, K., Girgin, Z.C., Aksoylu, M.G, “Research on the normality of the plastic strain vector to the yield surface in RC sections”, Materials and Structures, 47(7), pp.1115-1130, 2014.
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Girgin, Z.C., "A Modified Failure Criterion to Predict Ultimate Strength of Circular Columns Confined by Different Materials", ACI Structural Journal, Vol.106 (6), Nov-Dec 2009, pp. 800-809. 
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Girgin, Z.C., Arıoğlu, N., Arıoğlu, E. “Evaluation of Strength Criteria for Very-High-Strength-Concretes under Triaxial Compression”, ACI Structural Journal, Vol.104 (3), May-June 2007, pp. 278-284.
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Arıoğlu, N., Girgin, Z.C., Arıoğlu, E., “Evaluation of the Ratio Between Splitting Tensile Strength and Compressive Strength for Concretes up to 120 MPa and its Application in Strength Criterion”, ACI Materials Journal, Vol.103 (1), Jan. 2006, pp. 18-24.
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Girgin, Z.C., Girgin, K., “A Numerical Method for Static and Free-Vibration analysis of Non-Uniform Timoshenko Beam-Columns”, Canadian Journal of Civil Engineers, 33, March 2006, pp.278-293.
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Girgin, Z.C., Girgin, K., “A Numerical Model for Static or Dynamic Stiffness Matrix of Non-Uniform Members Resting on Variable Elastic Foundations”, Engineering Structures, 27, 2005, pp. 1373-1384.
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Discussions

Pann, K.S., Yen T., Tang, C.W., Lin, T.D. “New Strength Model on Water-Cement Ratio and Capillary Porosity”, ACI Materials Journal, July-August 2003, Discussion by Arioglu, N., Girgin, Z.C., Arioglu, E., May-June 2004,Vol.101(3), p.250-252.

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Qasrawi, H.Y. “Concrete Strength by Combined Nondestructive Methods Simply and Reliably Predicted”, Cement and Concrete Research, 30, 2000,  Discussion by Arioğlu, E., Arioglu, N., Girgin, Z.C., 31, 2001, p. 1239-1240.

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Carpinteri, A., Ferro, G., Monetto, I. “Scale Effects in Uniaxially Compressed Concrete Specimens”, Magazine of Concrete Research, 51(3), 1999, Discussion by Arioglu, E., Arioglu, N., Girgin, Z.C., 52(5), 2000, p.395-398. 

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Articles in Other Indexed Journals

Kuruscu, A.O, Girgin, Z.C., "Efficiency of Structural Materials in Sustainable Design", Journal of Civil Engineering and Architecture, Vol.8, No.10, October 2014, pp. 1260-1265, ISSN 1934-7359.

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Girgin, Z.C., "Statistical Evaluation of Worldwide Sustainable Energy Production (2000-2010)", Journal of Energy and Power Engineering, Vol.6 (10), October 2012, pp. 1575-1581.

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Details of Articles in SCI-Expanded


Title: Effect of slag, nano clay and metakaolin on mechanical performance of basalt fibre cementitious composites

By: Girgin, ZC (Girgin, Zehra Canan)

Source: Construction and Building Materials

Volume: 192

Pages: 70-84

DOI: https://doi.org/10.1016/j.conbuildmat.2018.10.090

Published: DEC 2018

Abstract: In this study, the effects of pozzolanic admixtures (ground granulated blast furnace slag, nano-clay, metakaolin) are investigated in chopped basalt fibre cementitious composites (BRC). First, the variations in compressive strengths and flexural characteristics during 3, 7, 28, 56, 90 and 120-day curing periods are addressed. Afterwards, most importantly, the degradation in the flexural performance during aging tests (freeze-thaw test, heat-rain test) are focused. The main aim is considerably to save the pull-out behaviour of BRC, even when exposed to harsh atmospheric conditions. All the test results are compared with control specimens (100% cement). The results arising from the experiments including metakaolin are promising to enhance the durability performance of BRC. The implications in this experimental study are valid for basalt fibre reinforced concrete (BFRC) subjected to those atmospheric conditions as well.

ISSN  : 0950-0618
eISSN: 1879-0526

Accession Number: WOS:000453494600008  

Title: Usability of basalt fibres in fibre reinforced cement composites

By: Girgin, ZC (Girgin, Zehra Canan); Yildirim, MT (Yildirim, Mehtap Tak)

Source: MATERIALS AND STRUCTURES

Volume: 49

Issue: 8

Pages: 3309-3319

DOI: https://doi.org/10.1617/s11527-015-0721-4
Published: AUG 2016

Abstract: In the recent years, the basalt fibre (BF) reinforced polymer composites were introduced to retrofit the structural elements. However, on the contrary, the studies on the use of BF in concrete are very limited. This study addresses experimentally to find out the performance of BF as an alternative to glass fibres for the usability in fibre reinforced cement composites (e.g. fac, ade panels). BF have some advantages such as fire resistance and alkaline resistance higher than those of glass fibres. The research was especially carried out to achieve the variation of the flexural strength in the extreme conditions that only cement was used as binder material. The heatrain test was conducted to observe durability of BF as well. The experimental results indicated that the flexural strain capacity of BF is sensitive to stress accumulation due to the cement hydration products in the matrix-fibre interface. This sensitivity especially increased during heat-rain durability test, however any sign of chemical attack in the alkaline environment was not observed in SEM images.

ISSN: 1359-5997

Accession Number:  WOS:000379590300022

Title: A Design-Oriented Combined Model (7 MPa to 190 MPa) for FRP-Confined Circular Short Columns

By: Girgin, ZC (Girgin, Zehra Canan); Girgin, K (Girgin, Konuralp)

Source: POLYMERS

Volume: 7

Issue: 10
Pages: 1905-1917

DOI: https://doi.org/10.3390/polym7101489
Published: OCT 2015

Abstract: This study addresses a design oriented combined model to predict the ultimate strengths and ultimate strains in an extensive range of unconfined strength (7 to 190 MPa) for the axially loaded fiber-reinforced polymer (FRP)-wrapped circular short columns. Modified Hoek-Brown strength criterion, which was previously extended to FRP-confined concrete from 7 to 108 MPa, is revisited and verified. An empirical strength model beyond 108 MPa encompassing ultra-high strength concrete (UHSC) and ultra-high performance concrete (UHPC) data, as well as empirical strain models, are defined to accomplish the design oriented combined model. This article especially focuses on the verification of the proposed strain models. The assessment performances of those models for carbon FRP (CFRP) and glass FRP (GFRP) confinement are compared with specific models in the current literature. Strength and strain predictions for UHSC and UHPC are integrated into the design oriented combined model as well. The assessments on this model agree with the experimental results in high accuracy.

ISSN: 2073-4360
Accession Number: WOS:000364289200001

Title: Research on the normality of the plastic strain vector to the yield surface in RC sections

By: Girgin, K (Girgin, Konuralp); Girgin, ZC (Girgin, Z. Canan); Aksoylu, MG (Aksoylu, M. Gunhan)
Source: MATERIALS AND STRUCTURES

Volume: 47

Issue: 7

DOI: https://doi.org/10.1617/s11527-013-0116-3
Published: JUL 2014

Abstract: In this study, the normality condition of the plastic strain vector to the yield surface utilized for elastic-perfectly plastic materials is investigated for reinforced concrete (RC) sections. If the plastic strain vector can be assumed outward normal to the yield surface in RC sections under combined biaxial bending and axial load, the components of the vector can be expressed by a single parameter. Thus, the material nonlinearity can be simplified through the extended plastic hinge concept based on the normality condition. In this study the normality of the plastic strain vector is verified via numerical examples in symmetrically reinforced rectangular and circular RC sections subjected to biaxial bending and axial load for various configurations of longitudinal reinforcement.

ISSN: 1359-5997
eISSN: 1871-6873
Accession Number: WOS:000336021300002


Title: Modified Johnston Failure Criterion from Rock Mechanics to Predict the Ultimate Strength of Fiber Reinforced Polymer (FRP) Confined Columns
By: Girgin, ZC (Girgin, Zehra Canan)

Source: POLYMERS 

Volume: 6
Issue: 1
Pages: 59-75
DOI: https://doi.org/10.3390/polym6010059
Published: JAN 2014

Abstract: The failure criteria from rock mechanics, Hoek-Brown and Johnston failure criteria, may be extended and modified to assess the ultimate compressive strength of axially loaded circular fiber reinforced polymer (FRP)-confined concrete columns. In addition to the previously modified Hoek-Brown criterion, in this study, the Johnston failure criterion is extended to scope of FRP-confined concrete, verified with the experimental data and compared with the significant relationships from the current literature. Wide-range compressive strengths from 7 to 108 MPa and   high confinement ratios up to 2.0 are used to verify the ultimate strengths in short columns. The results are in good agreement with experimental data for all confinement levels and concrete strengths.

ISSN: 2073-4360
Accession Number: WOS:000336091800004


Title: Modified Failure Criterion to Predict Ultimate Strength of Circular Columns Confined by Different Materials
By: Girgin, ZC (Girgin, Z. Canan)

Source: ACI STRUCTURAL JOURNAL
Volume: 106
Issue: 6
Pages: 800-809
Published: NOV-DEC 2009

Abstract: This study addresses the extension of a failure criterion developed for rock data to small or near full-size circular concrete columns confined by different materials. Initially, a wide range database on small-scale specimens confined by fiber-reinforced polymer (FRP) sheets or tubes and analytical studies were evaluated to predict the ultimate compressive strength. Then, the reinforced concrete (RC) short-columns retrofitted with FRP jacket were examined through available data. The research further covers middle- or near full-scale columns confined by FRP composites and steel reinforcement. All of these estimations were conducted within a unified approach to the failure criterion. Thus, the ultimate compressive strength for different confining materials can be predicted easily and systematically.

ISSN: 0889-3241
Accession Number: WOS:000271202100006

Title: Evaluation of strength criteria for very-high-strength concretes under triaxial compression
By: Girgin, ZC (Girgin, Z. Canan); Arioglu, N (Arioglu, Nihal); Arioglu, E (Arioglu, Ergin)
Source: ACI STRUCTURAL JOURNAL
Volume: 104
Issue: 3
Pages: 278-284
Published: MAY-JUN 2007

Abstract: In this study, the empirical relationships proposed in the current literature were verified to assess their validity for compressive strengths between 66 and 132 MPa (8700 to 19,145 psi). A relationship was suggested to predict the ultimate strength 4 very high-strength concrete under triaxial compression. Furthermore, strength criteria essentially developed to estimate the ultimate strength of intact rock were applied to the concrete. The results of triaxial tests were employed to verify the applicability of these strength criteria for high-strength concrete. It is interesting to note that the strength criteria developed for intact rocks can also be applied to the assessment of ultimate strength and failure curve in high-strength concretes. Knowing only the cylinder compressive strength and the ratio of tensile-to-compressive strength, the failure envelope can be successfully evaluated by means of these criteria without performing triaxial tests in high-strength concretes.

ISSN: 0889-3241
Accession Number: WOS:000246510900003

Title: A numerical method for static and free-vibration analysis of non-uniform Timoshenko beam-columns

By: Girgin, ZC (Girgin, ZC); Girgin, K (Girgin, K)
Source: CANADIAN JOURNAL OF CIVIL ENGINEERING
Volume: 33
Issue: 3
Pages: 278-293
DOI: https://doi.org/10.1139/L05-109
Published: MAR 2006

Abstract: A generalized numerical method is proposed to derive the static and dynamic stiffness matrices and to handle the nodal load vector for static analysis of non-uniform Timoshenko beam-columns under several effects. T his method presents a unified approach based,on effective utilization of the Mohr method and focuses on the following arbitrarily variable characteristics: geometrical properties, bending and shear deformations, transverse and rotatory inertia of mass, distributed and (or) concentrated axial and (or) transverse loads, and Winkler foundation modulus and shear foundation modulus. A successive iterative algorithm is developed to comprise-all these characteristics systematically. The algorithm enables a non-uniform Timoshenko beam-column to be regarded as a substructure. This provides an important advantage to incorporate all the variable characteristics based on the substructure. The buckling load and fundamental natural frequency of a substructure subjected to the cited effects are also assessed. Numerical examples confirm the efficiency of the numerical method.

ISSN: 0315-1468
Accession Number: WOS:000238258600008


Title: Evaluation of ratio between splitting tensile strength and compressive strength for concretes up to 120 MPa and its application in strength criterion

By: Arioglu, N (Arioglu, N); Girgin, ZC (Girgin, ZC); Arioglu, E (Arioglu, E)
Source: ACI MATERIALS JOURNAL
Volume: 103
Issue: 1
Pages: 18-24
Published: JAN-FEB 2006
Abstract: A large-scale regression analysis was carried out using experimental data gathered from various sources to evaluate the ratio of splitting tensile strength to cylinder compressive strength as a function of compressive strength of concrete. The reliability of the proposed equation based on experimental data for compressive strength ranging between 4 and 120 MPa (580 to 17,400 psi) was assessed by means of the integral absolute error (IAE). It is also shown that, by only knowing compressive strength and the ratio of tensile to compressive strength, the failure envelope for very high-strength concrete can be established using Johnston's strength criterion without performing triaxial compression tests. A numerical example demonstrates the application of Johnston's strength criterion.
ISSN: 0889-325X
Accession Number: WOS:000237129000003

Title: A numerical method for static or dynamic stiffness matrix of non-uniform members resting on variable elastic foundations
By: Girgin, ZC (Girgin, ZC); Girgin, K (Girgin, K)
Source: ENGINEERING STRUCTURES
Volume: 27
Issue: 9
Pages: 1373-1384
DOI: https://doi.org/10.1016/j.engstruct.2005.04.005
Published: AUG 2005

Abstract: This paper presents a generalized numerical method which is based on the well-known Mohr method. Static or dynamic stiffness matrices, as well as nodal load vectors for the static case, of non-uniform members are derived for several effects. The method focuses on the effects of resting on variable one- or two-parameter elastic foundations or supported by no foundation; a variable iterative algorithm is developed for computer application of the method. The algorithm enables the non-uniform member to be regarded as a sub-structure. This provides an important advantage to encompass all the variable effects in the stiffness matrix of this sub-structure. Stability and free-vibration analyses of the sub-structure can also be carried out through this method. Parametric and numerical examples are given to verify the accuracy and efficiency of the submitted method.

ISSN: 0141-0296
Accession Number: WOS:000230383300007