
Konuralp GirginIstanbul Technical University · Department of Civil Engineering
Konuralp Girgin
Prof. Dr.
About
38
Publications
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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)
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...
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...
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...
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...
SLENDERNESS EFFECT IN REINFORCED CONCRETE FRAMES
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
Structural Behaviour Factor for Systems of Normal Ductility Level (in Turkish)
Seismic Safety Assessment and Rehabilitation of Existing RC Structures Built in Earthquake Zones (in Turkish)
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...