Volkan Kahya

Volkan Kahya
Karadeniz Technical University · Department of Civil Engineering

Doctor of Philosophy

About

48
Publications
10,972
Reads
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657
Citations
Introduction
My research interests cover numerical and analytical modelling of structures made of laminated composites and FGMs, vibration control in structures using passive control devices, and damage detection and health monitoring in structures using intelligent computational tools.
Additional affiliations
March 2019 - present
Karadeniz Technical University
Position
  • Professor (Full)
May 2013 - March 2019
Karadeniz Technical University
Position
  • Professor (Associate)
June 2006 - May 2013
Karadeniz Technical University
Position
  • Professor (Assistant)

Publications

Publications (48)
Article
Full-text available
A numerical procedure to detect and quantify damages in laminated composite beams with arbitrary lay-up using limited vibration data and harmony search optimization is presented. Since any damage in a structure changes its vibration characteristics, they can be considered as the diagnostic parameters with the help of an optimization technique. For...
Article
The study aims at proposing a methodology for optimization of multiple tuned mass dampers (MTMD) in reducing the multi-resonance vibrations of continuous bridges due to moving train loads. The equations of motion for time-domain analysis are derived for obtaining train-induced vibrations of a two-span continuous railway bridge with equipped MTMD-1...
Article
Full-text available
Tuned mass dampers (TMDs) are used to reduce dynamic vibrations of structures under environmental loads such as wind or seismic excitation. In this paper, the optimum design of non- traditional tuned mass dampers (NT-TMD) attached to a damped main structure under harmonic excitation was investigated. Unlike the traditional TMD, the damping elemen...
Article
This paper presents damage identification and localization in laminated composite beams including multiple cracks by automated model updating. For this aim, a cantilever beam made of glass/epoxy composite laminate under six simulated damage scenarios is considered. Experimental frequencies and mode shapes of the beam are validated with those of ANS...
Article
Full-text available
The effectiveness of the series tuned mass dampers (STMDs) in reducing the dynamic vibrations of the structures under the ground motion is investigated, and their optimum parameters are obtained based on the simulated annealing (SA) optimization. The STMD is one of the most well-known passive control devices which consists of two TMD units arranged...
Article
This work aims to experimentally show the effectiveness of annular cylindrical tuned liquid dampers (ACTLDs) on the classical tuned liquid column dampers (TLCDs) under the effect of inclined ground motion. For experimental measurements, a single-story model structure constituted by two plates at the top and bottom connected by four columns was cons...
Article
This study presents the experimental and numerical assessment of natural frequencies and corresponding mode shapes of cross-laminated timber (CLT) beams subjected to a series of damage cases. To this aim, two different cantilever CLT beams consisting of three layers are considered. Damages on the beam are represented by transversal notches (cracks)...
Article
A finite element model with two nodes and four degrees of freedom per node (horizontal and vertical translations, rotation, and curvature) is presented for free vibration analysis of damaged tapered beams. Stiffness and mass matrices for Bernoulli-Euler beams with variable cross-sections are derived by using the Galerkin method. In the finite eleme...
Article
In this study, free vibration analysis of layered composite beams is performed by using an analytical method based on trigonometric series. Based on the first-order shear deformation beam theory, the governing equations are derived from the Lagrange’s equations. Appropriate trigonometric series functions are selected to satisfy the end conditions o...
Article
This study presents identification and localization of open transverse edge cracks in laminated composite beams by using vibration measurements. To this aim, a composite cantilever beam is considered under six damage scenarios. Natural frequencies and mode shapes of the beam for each case are obtained numerically by using a shear-deformable finite...
Article
A shear-deformable finite element model (FEM) with five nodes and thirteen degrees of freedom (DOFs) for free vibrations of laminated composite beams with arbitrary lay-up is presented. This model can be capable of considering the elastic couplings among the extensional, bending and torsional deformations, and the Poisson’s effect. Lagrange’s princ...
Article
Full-text available
In modal testing, the quality of vibration signals and clarity of peak points to extract the natural frequencies, corresponding mode shapes and damping ratio depend on the number and location of the sensors. High measurement costs are required for structural identification and long-term structural health monitoring in large structures, which requir...
Article
This paper presents the applicability of series tuned mass dampers (STMDs) to reduce the multiple resonant responses of continuous railway bridges under high-speed train. The bridge is modeled by two-span Bernoulli-Euler beam with uniform cross-section, and a STMD device consisting of two TMD units installed on the bridge to reduce its multiple res...
Article
Full-text available
In this study, a simple method is proposed to obtain the optimum design parameters of vibration absorbersconsisting of several tuned mass damper units connected each other in parallel. The method is essentially theextension of the formulas proposed by Den Hartog for single degree-of-freedom tuned mass dampers tomultiple tuned mass dampers. To demon...
Article
Free vibration analysis of laminated composite beams including open transverse cracks is presented by using a shear-deformable thirteen degrees-of-freedom finite element model, which considers extension-twist, bending-twist and bending-extension couplings, and the Poisson's effect. Lagrange's equation is employed to derive the equations of motion....
Article
This study investigates the performance of annular cylindrical liquid column dampers (ACTLDs) for vibration suppression of structures with experimental tests. To this aim, a shear-type frame consisting of a top and bottom plate with four columns is constructed in laboratory and is exposed to ground motion with different directions. Dynamic characte...
Article
Full-text available
Bu çalışmada, birinci mertebe kayma deformasyonu teorisine dayalı olarak fonksiyonel derecelendirilmiş kirişlerin serbest titreşim analizi Navier tipi çözüm yöntemi kullanılarak yapılmıştır. Hareket denklemleri Lagrange eşitlikleri ile türetilmiş, problemin çözümünde ise trigonometrik fonksiyonlar kullanılmıştır. Farklı sınır şartlarına, hacimsel o...
Article
IN THIS STUDY, THE PLANE RECEDING CONTACT PROBLEM for a functionally graded (FG) layer resting on two quarter-planes is considered by using the theory of linear elasticity. The layer is indented by a rigid cylindrical punch that applies a concentrated force in the normal direction. While the Poisson's ratio is kept constant, the shear modulus is as...
Article
Full-text available
Using different optimization techniques, the optimum characteristics of multiple tuned mass dampers (MTMD) for reducing the dynamic response of primary structure due to various excitations are studied by many researchers. In this paper, the five practical MTMD models are considered which consist of different combinations of the mass, damping, stiff...
Article
This study presents damage localisation in steel cantilever beams including multiple cracks based on changes in the modal curvature and flexibility. Natural frequencies and corresponding mode shapes of circular-hollow-sectional and box-sectional steel cantilever beams are obtained by analytical and experimental models under six damage scenarios. Ba...
Article
This paper considers a Timoshenko cantilever beam with box cross-section including multiple cracks. Under six damage scenarios, the problem is solved analytically by the transfer matrix method, and numerically by the finite element method. Results are validated by the experimental measurements with the aid of ambient vibration tests, that use Enhan...
Article
This paper presents a multi-layer finite element for buckling and free vibration analyses of laminated beams based on a higher-order layer-wise theory. An N-layer beam element with (9N + 7) degrees-of-freedom is proposed for analyses. Delamination and slip between the layers are not allowed. Element matrices for the single- and multi-layer beam ele...
Article
Full-text available
In this study, stress intensity factors at crack tip in a simply-supported elastic beam with multiple cracks subjected to moving loads is considered. Massless rotational spring is used for modelling the crack. Natural frequencies and corresponding mode shapes are obtained by the transfer matrix method. Equation of motion for the forced vibration pr...
Article
This paper presents a finite element model based on the first-order shear deformation theory for free vibration and buckling analyses of functionally graded (FG) sandwich beams. The present element has 3 N + 7 degrees-of-freedom for an N-layer beam. Lagrange's equations are employed for derivation of the equations of motion. Two types of FG sandwic...
Article
This paper gives experimental tests’ results for the control performance of Tuned Liquid Column Dampers (TLCDs) installed on a prototype structure exposed to ground motions with different directions. The prototype structure designed in the laboratory consists of top and bottom plates with four columns. Finite element analyses and ambient vibration...
Article
This paper presents a detailed study on the automated model updating of a cantilever beam with box cross-section including multiple cracks for damage detection. To consider multiple crack effects, a cantilever beam with cracks is considered under six damage scenarios. Finite element models are first constituted in ANSYS software for numerical solut...
Article
This paper presents the structural identification problem of a multiple damaged cantilever beam with hollow circular cross-section. To consider multiple crack effects, the cantilever beam including cracks is considered for six damage scenarios. The problem is solved by the transfer matrix method analytically and the finite element method numericall...
Article
This paper presents a detailed investigation on the modal parameter identification and vibration based damage detection of a multiple cracked cantilever beam with hollow circular cross-section. To consider multiple crack effects, a cantilever beam including cracks is considered for six damage scenarios. Finite element models are constituted in ANSY...
Article
This paper presents the series multiple tuned mass dampers (STMDs) to suppress the resonant vibrations of railway bridges under the passage of high-speed trains (HSTs). A STMD device consisting of two spring-mass-damper units connected each other in series is installed on the bridge. In solution, bridge is modeled as a simply-supported Euler-Bernou...
Article
Full-text available
The present paper examines the plane strain receding frictionless contact problem of two functionally graded layers indented by a rigid cylindrical punch and with mismatched material properties at the interface. The shear moduli of the layers are assumed to vary in exponential form along the thickness direction and the Poisson’s ratios are taken as...
Article
This study considers a functionally graded (FG) elastic layer resting on homogeneous elastic substrate under axisymmetric static loading. The shear modulus of the FG layer is assumed to vary in an exponential form through the thickness. In solution, the FG layer is approximated into a multilayered medium consisting of thin homogeneous sublayers. St...
Article
Full-text available
In this study, resonant vibrations of two-span railway bridges subjected to high-speed trains (HSTs) are studied. The continuous beam is modelled by using Bernoulli-Euler beam theory, and the train is considered as a series of moving concentrated loads. The dynamic response is obtained analytically by using the assumed mode method. Effects of the s...
Article
Full-text available
This study presents dynamic analysis of pre-stressed elastic beams under the action of moving mass loads by using Bernoulli-Euler, Rayleigh, and shear beam models. It is assumed the mass moves with a constant speed and is in continuous contact with the beam during its motion. Discrete equations of motion with time-dependent coefficients are obtaine...
Article
a b s t r a c t Consecutive earthquakes occurred on October 23rd, 2011 in Ercis and on November 9th, 2011 in Edremit that are townships located 90 km and 18 km far from Van city in Turkey, respectively. A total of 28,000 buildings were damaged or collapsed in the city center and the surrounding villages after the Ercis earthquake. This number reach...
Article
This study presents dynamic analysis of laminated beams traversed by moving loads using a multilayered beam element based on the first-order shear deformation theory. The present element consists of N layers with different thickness and material property, and has (3N + 7) degrees of freedom corresponding three axial, four transversal, and 3N rotati...
Article
This study presents a multilayered shear deformable beam element for dynamic analysis of laminated composite beams subjected to moving loads. The present laminated beam element includes separate rotational degrees of freedom for each lamina while it does not require any additional axial and transversal degrees of freedom beyond those necessary for...
Article
In this study, approximate analytical solution for the dynamic response of composite sandwich beams subjected to moving mass is presented. Using modal superposition, the equation of motion for the beam is derived in matrix form. Since coefficients of the matrix equation of motion are time-dependent, Newmark's method is employed for numerical soluti...
Article
This paper considers a frictionless receding contact problem between an anisotropic elastic layer and an anisotropic elastic half plane, when the two bodies are pressed together by means of a rigid circular stamp. The problem is reduced to a system of singular integral equations in which the contact stresses and lengths are the unknown functions. N...
Article
Full-text available
A frictionless contact problem for a two-layer orthotropic elastic medium loaded through a rigid flat stamp is considered. It is assumed that tensile tractions are not allowed and only compressive tractions can be transmitted across the interface. In the solution, effect of gravity is taken into consideration. If the external load on the rigid stam...
Article
In this paper, a partially closed crack problem in an anisotropic infinite elastic layer loaded by a transverse pair of compressive concentrated forces P and a pair of uniform tensile stress p0 along the crack surface is considered. Friction and gravity forces are neglected. The partial closure problem is solved by assuming that the stress-intensit...
Article
Full-text available
The plane contact problem for an elastic layer bonded to a rigid support on its top surface is considered according to the theory of elasticity. The layer is subjected to a concentrated load at its bottom surface by means of a rigid stamp. Profile of the rigid stamp is taken in the form as circular, parabolic and rectangular. It is assumed that the...
Article
Full-text available
In this study, the contact problem of a layered composite which consists of two materials with different elastic constants and heights resting on two rigid flat supports with sharp edges is considered. The effect of gravity is neglected. While friction between the layers is taken into account, it is assumed that there is no friction between the sup...

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Projects

Projects (2)
Project
The project investigates performance of TMD, TLD and other passive control devices in vibration suppression of bridges and tall-buildings via experimental modelling.
Project
The project aims at (a) evaluating the performance of the vibration-based damage detection methods available in literature with emphasis on composite structures, and (b) developing a new methodology for damage detection in composites using optimization-based model updating based on vibration data