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    Design of buckling restrained braces with composite technique
    (Techno-Press, 2020) Özçelik, Ramazan; Dikiciaşık, Yağmur; Civelek, Kazım B.; Erdil, Elif F.; Erdal, Ferhat
    This paper focus on the buckling restrained braces (BRBs) with new casing members (CMs). Seven BRBs with CMs consisting of precast concrete modules (PCMs) were tested to investigate the effects of CMs on the cyclic performance of BRBs. The PCMs consisted of plain and reinforced concrete casted into wooden or steel molds than they were located on the core plate (CP) via bolts. There were 14 or 18 PCMs on the CP for each BRBs. The technique of the PCMs for the CM provides that the BRBs can be constructed inside the steel or reinforced concrete (RC) structures. In this way, their applications may be rapid and practical during the application of the retrofitting. The test results indicated that the cyclic performance of the BRBs was dominated by the connection strength and confinement of the PCMs. The BRBs with PCMs wrapped with fiber reinforced polymers (FRPs) sustained stable hysteretic performance up to a CP strain of 2.0 %. This indicates that the new designed BRBs with PCMs were found to be acceptable in terms of cyclic performance. Furthermore, the connection details, isolation materials and their application techniques have been also investigated for the improved BRB design in this study.
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    Effect of geometry on flexural behavior of optimal designed web-expanded beams
    (Elsevier Ltd., 2024) Taş, Serkan; Erdal, Ferhat; Tunca, Osman; Özçelik, Ramazan
    Web-expanded steel beams (WESBs) are an excellent example of technological progress in the construction industry. The objective of this research is to compare the flexural strength of optimally designed geometrically diverse WESBs, including castellated, cellular, and angelina types. First, the minimum design weights of these three different WESB types are determined using nature-inspired harmony search (HSA) and particle swarm optimization techniques (PSO), according to the ANSI/AISC-360 and Eurocode practical design rules. Subsequently, a comprehensive experimental procedure was carried out to investigate the load-carrying capacity and failure modes of eighteen new generation simply supported WESBs, which were optimally designed. Scale models of the tested beams, originally made of steel sections with I-profiles, were subjected to various external loads in the reaction frame laboratory. The experimental results confirmed that angelina beams performed better than castellated and cellular beams under all loading conditions. Finally, a three-dimensional finite element analysis was performed for each specimen. These numerical verification analyses, performed using ANSYS Workbench, considered both geometric and material nonlinearities to validate realistic laboratory test results.
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    Experimental and finite element study of optimal designed steel corrugated web beams
    (SAGE Publications Inc., 2021) Erdal, Ferhat; Tunca, Osman; Tas, Serkan; Özçelik, Ramazan
    The structural performance of standard steel sections in long-span constructions gradually deteriorates due to wider and slighter webs that tend to buckle. This is the characteristic problem of plane webs. Corrugated steel web plates allow a considerable reduction of weight and increasing the web capacity of the beam. The experimental test results of optimal designed corrugated web beams, fortifying thin-walled steel girders without stiffeners, under load conditions, have been compared with the 3-D plane strains finite elements (FE) model in this paper. The span of fabricated corrugated web beams (CWB) is chosen as 5 m. These optimally designed CWB are exposed to a single concentrated loading, two-point loading, and partially distributed loading, respectively. The design methods for CWB are firefly optimization and hunting search algorithms. The implementation of design constraints is based on the EUROCODE, DIN, and DAST-Ri. 015 code provisions. The load-displacement curves, the residual load capacity, and the failure form of eighteen tested corrugated web beams are inquired in depth along the experimental process. The structural analysis software ANSYS is used for the simulation of the experimental study, the verification of all test results, and the investigation of the behavior of failure forms. © The Author(s) 2021.
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    Experimental investigation and numerical analysis of optimally designed composite beams with corrugated steel webs
    (Techno-Press, 2020) Erdal, Ferhat; Tunca, Osman; Özçelik, Ramazan
    Composite beams with corrugated steel webs represent a new innovative system which has emerged in the past decade for medium span in the construction technology. The use of composite beams with corrugated steel webs results in a range of benefits, including flexible spaces and reduced foundation costs in the construction technology. The thin corrugated web affords a significant weight reduction of these beams, compared with hot-rolled or welded ones. In the current research, an optimal designed I-girder beam with corrugated web has been proposed to improve the structural performance of continuous composite girder under bending moment. The experimental program has been conducted for six simply supported composite beams with different loading conditions. The tested specimens are designed by using one of the stochastic techniques called hunting search algorithm. In the optimization process, besides the thickness of concrete slab and studs, corrugated web properties are considered as design variables. The design constraints are respectively implemented from Eurocode 3, BS-8110 and DIN 18-800 Teil-1. The last part of the study focuses on performing a numerical study on composite beams by utilizing finite element analysis and the bending behavior of steel girders with corrugated webs experimentally and numerically verified the results. A nonlinear analysis was carried out using the finite element software ANSYS on the composite beams which were modelled using the elements ten-node high order quadrilateral type.
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    Influence of trapezoidal and sinusoidal corrugation on the flexural capacity of optimally designed thin-walled beams
    (Techno-Press, 2022) Erdal, Ferhat; Tunca, Osman; Taylan, Harun; Özçelik, Ramazan; Söğüt, Hüseyin
    Major engineering requirements and technological developments in the steel construction industry are discussed to support a new innovative system, namely corrugated web beams, for future structural projections. These new-generation steel beams, fabricated as welded plate girders with corrugated webs, are designed to combine large spans with very low weight. In the present study, the flexural capacity of optimally designed trapezoidal and sinusoidal corrugated web beams was aimed at. For this purpose, the new metaheuristic methods, specifically hunting search and firefly algorithms, were used for the minimum weight design of both beams according to the rules of Eurocode EN 1193 15 and DASt-Ri 015. In addition, the strengthening effects of the corrugation geometry at the web posts on the load capacity of fabricated steel beams were tested in a reaction frame. The experimental tests displayed that the lateral capacity of trapezoidal web beams is more durable under flexural loads compared to sinusoidal web beams. These thin-walled beams were also simulated using a 3-D finite element model with plane strain to validate test results and describe the effectiveness of the ABAQUS software.