Konuralp Girgin

Konuralp Girgin
Istanbul Technical University · Department of Civil Engineering

Prof. Dr.

About

38
Publications
23,486
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
262
Citations
Citations since 2016
4 Research Items
177 Citations
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
Introduction
Konuralp Girgin currently works at the Department of Civil Engineering, Istanbul Technical University. His research fields are structural and earthquake engineering. He is the author of many papers published in various journals and proceedings. Website: https://konuralp-girgin.blogspot.com/

Publications

Publications (38)
Article
Full-text available
In spread footings, the rotational spring constants, which represent the soil-structure interaction, play an important role in the structural analysis and design. To assign the behaviour of soil, which is generally represented via Winkler-type tensionless springs, necessitates time consuming iterative computing procedures in practice. In this study...
Article
Full-text available
The purpose of this study is to calculate the torsional rigidity and maximum shear stresses of arbitrarily shaped orthotropic composite or functionally graded material sections on the basis of a hybrid finite element approach. A hybrid finite element based on a Hellinger–Reissner functional is presented. A set of numerical examples is solved to ver...
Article
Full-text available
ÖZ Bu çalışmada çok katlı betonarme çerçevelerde “Moment Büyütme” yöntemi ile elde edilen sonuçlar II. mertebe sonuçları ile karşılaştırılmış ve doğruluk mertebeleri irdelenmiştir. Seçilen tipik çerçevelerin narin kolonlarında moment büyütme yöntemi ile elde edilen tasarım momentleri II. mertebe hesapları sonunda bulunanlar ile karşılaştırılmış ve...
Article
Full-text available
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...
Article
Full-text available
The purpose of this study is to investigate the seismic performance of a specific type structural system that is utilized for almost all of the new residential buildings currently constructed as part of the Istanbul Urban Transformation Project. The structural system under consideration is comprised of lateral and gravity system elements, namely co...
Article
Full-text available
In this study, the results of "Moment Magnification" method provided are compared with those obtained by applying second order theory and the order of accuracy is examined. The bending moments of slender columns of chosen typical frames are obtained by applying moment magnification method and compared with those found by the second order theory. Th...
Article
Full-text available
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...
Article
Full-text available
The purpose of this study is first to determine the conditions for excessive torsional irregularity and then to discuss the validity of code provisions. A parametric investigation is performed on six groups of typical structures with varying shear wall positions, story, and axis numbers. It is found that torsional irregularity coefficients increase...
Article
Full-text available
The goal of this paper is to investigate the non-linear response and to assess the seismic performance of a six story eccentrically braced steel frame (EBF). For this, split-K-braced EBF with high ductility level designed according to the Turkish Earthquake Code-2007 (TEC-07) is analyzed under seven selected earthquake records. The performance of t...
Article
Full-text available
There are different approaches in the performance based design of the existing reinforced concrete structures, regarding the determination of the intersection point of capacity and demand curves. While the equivalent displacement approach is employed in Turkish Earthquake Code (TEC2007), a successive approximation technique based on the effective p...
Article
This study introduces a new load increment method for the ductile reinforced concrete (RC) frame structures by including strain-hardening effects. The proposed method is a nonlinear static analysis technique employed for RC frame structures subjected to constant gravity loads and monotonically increasing lateral loads. The material nonlinearity in...
Article
Full-text available
This study introduces a new load increment method for the ductile reinforced concrete (RC) frame structures by including strain-hardening effects. The proposed method is a nonlinear static analysis technique employed for RC frame structures subjected to constant gravity loads and monotonically increasing lateral loads. The material nonlinearity in...
Article
Full-text available
In several design codes and specifications, simplified formulae, diagrams or nomographs are given for determining the effective lengths of frame columns. It is shown that these simplified approaches may yield rather erroneous results in most of the cases. This is due to the fact that, the code formulae: utilise only local stiffness distributions, t...
Article
Full-text available
In this article, performance evaluations of a 3D building strengthened by additional shear-walls are presented as a case study by considering the foundation effects. Soil-structure interaction is included in the nonlinear static analysis of the building and performance evaluations are made according to Chs. 6 and 8 of FEMA440. Different foundation...
Article
Full-text available
In several design codes and specifications, simplified formulae and charts are given for determining the effective lengths of frame columns. It is shown that these formulae may yield rather erroneous results in certain cases. This is due to the fact that, the code formulae utilise only local stiffness distributions. In this paper, a simplified proc...
Article
Full-text available
A simplified procedure for determining approximate values for the buckling loads of three-dimensional framed structures is developed. The procedure utilises lateral load analysis of structures and yields error-, less than 10%, which may be considered suitable for design purposes. The structures with or without rigid floor diaphragms may be consider...
Article
Full-text available
In this paper, the torsional rigidity of the composite sections formed by different materials is obtained by using a finite element procedure. In the derivation of the differential equation, the Saint-Venant's stress function was used. The obtained partial differential equation was discretized by finite elements to get the potentials in the nodal p...
Article
The purpose of this study is to calculate the torsional rigidity of arbitrarily shaped composite sections on the basis of hybrid finite element approach. An analogy is used between the torsion problem and deformation of a plate which exhibits only shear behavior. In the analysis a simple hybrid finite element based on Hellinger-Reissner functional...
Article
Full-text available
Structural frames are often filled with infilled walls serving as partitions. Although the infills usually are not considered in the structural analysis and design, their influence on the seismic behaviour of the infilled frame structures is considerable. In the present study, a parametric study of certain infilled frames, using the strut model to...
Book
Full-text available
The reduction of the seismic vulnerability of buildings and can correspond to very different interventions, as there are many types of structures, many materials and many ways to reduce vulnerability. This explains that a variety of topics is treated. The first chapter deals with the screening of buildings on an urban scale to identify which need r...
Article
The purpose of this study is to calculate the torsional rigidity of arbitrarily shaped composite sections on the basis of hybrid finite element approach. An analogy is used between the torsion problem and deformation of a plate which exhibits only shear behavior. In the analysis a simple hybrid finite element based on Hellinger-Reissner functional...
Article
Full-text available
Engineers often come face to face with helical springs especially in the applications of civil and mechanical engineering. In this study, free vibration analysis has been performed regarding cylindrical and conical helices. For this purpose, the necessary element matrix based on Timoshenko beam theory and consistent mass matrix of these helices wit...
Article
The objective of the study is to present a mixed finite element (FE) formulation for the free vibration analysis of non-cylindrical helices with variable cross-section. Non-cylindrical helix geometry was well approximated through the variable arc lengths and linear variations in curvatures via shape functions. The mixed FE model for non-cylindrical...
Article
In several design codes and specifications, simplified formulae and diagrams are given for determining the buckling lengths of frame columns. It is shown that these formulae may yield rather erroneous results, especially for irregular frames. This is due to the fact that the code formulae utilise only local stiffness distributions. In this paper, a...
Article
Full-text available
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. This method presents a unified approach based on effective utilization of the Mohr method and focuses on the following arbitrarily variab...
Article
Full-text available
Engineers often come face to face with helical springs especially in the applications of civil and mechanical engineering. In this study, free vibration analysis has been performed regarding cylindrical and conical helices. For this purpose, the necessary element matrix based on Timoshenko beam theory and consistent mass matrix of these helices wit...
Article
Full-text available
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 suppor...
Article
Full-text available
In this study, element loading matrices are defined for static application of classical Müller- Breslau principle to finite element method. The loading matrices are derived from existing element matrices using Betti’s law and known governing equations of F.E.M. Thus, the ordinates of influence lines and influence surfaces may be easily obtained fro...
Article
In several design codes and specifications, simplified formulae and diagrams are given for determining the buckling lengths of frame columns. It is shown that these formulae may yield rather erroneous results in certain cases. This is due to the fact that, the code formulae utilise only local stiffness distributions. In this paper, a simplified pro...
Article
In several design codes and specifications, simplified formulae and diagrams are given for determining the buckling lengths of frame columns. It is shown that these formulae may yield rather erroneous results in certain cases. This is due to the fact that, the code formulae utilise only local stiffness distributions. In this paper, a simplified pro...
Conference Paper
Full-text available
Huge amount of low rise reinforced concrete buildings have been constructed with important structural deficiencies, which cause substantial decrement in the expected safety against earthquakes. Concrete compressive strengths of these buildings are low, the amount of longitudinal reinforcement bars are lower than the code requirements, heavy corrosi...
Technical Report
Full-text available
Structural Behaviour Factor for Systems of Normal Ductility Level (in Turkish)
Technical Report
Full-text available
Seismic Safety Assessment and Rehabilitation of Existing RC Structures Built in Earthquake Zones (in Turkish)
Conference Paper
Full-text available
A method of load increments is presented for the non-linear static (pushover) analy-sis and determination of collapse loads of reinforced concrete space frame structures subjected to gravity loads combined with earthquake forces. The method accounts for the non-linearities caused by both the elastic-plastic behavior of reinforced concrete and the e...

Network

Cited By