Browsing by Author "Gunes,B."

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Citation - Scopus: 3
Approximate Seismic Evaluation Methods for Large Building Inventories With High Variability in Their Seismic Resistance
(2006) Gunes,B.; Yakut,A.; Gunes,O.; Department of Civil Engineering; 15. Graduate School of Natural and Applied Sciences; 01. Atılım University
Seismic hazard mitigation for urban infrastructures located in seismic regions is a challenge faced by many countries around the world, especially those with infrastructures known for their variability in quality of construction and compliance with the seismic codes. Two recent major earthquakes that hit the densely populated urban areas in Northwest Turkey resulted in a large-scale destruction and loss of life. Scientific studies indicate that the probability of occurrence of another severe earthquake along the North Anatolian Fault near Istanbul is quite high in the next few decades. This situation presents a serious threat to the large building stock and their occupants in Istanbul and adjacent areas. Structures in these areas are known to have high variability in their seismic resistance, which makes it difficult to estimate the potential losses in case of a major earthquake. Thus, there is an urgent need for a systematic strategy that will allow for rapid and reliable assessment of the seismic risk associated with existing buildings through an effective methodology that properly considers the local infrastructure characteristics. In this paper, approximate methods for seismic assessment of buildings are reviewed and are evaluated through their application to a group of 131 reinforced concrete frame buildings located in various seismic regions of Turkey. The results show that the recently developed preliminary methods that are customized for the local building characteristics provide improved prediction of seismic hazard, and may serve as an efficient and reliable risk assessment tool upon further improvement and calibration. The first stage procedures show large variability and result in considerable cases of misclassifications.
Citation - Scopus: 3
Design of Frp Retrofitted Flexural Members Against Debonding Failures
(2006) Gunes,O.; Karaca,E.; Gunes,B.; Department of Civil Engineering; 15. Graduate School of Natural and Applied Sciences; 01. Atılım University
Use of fiber reinforced polymer (FRP) composites in seismic retrofitting of structural members has been steadily increasing in recent years. An important design issue with significant performance and safety implications is the debonding of externally bonded FRP reinforcement in flexural members. This paper provides the highlights of an experimental and analytical research aimed at understanding and modeling of debonding failures in FRP strengthened reinforced concrete beams. An evolutionary experimental program investigated debonding failure mechanisms and modes in beams strengthened in shear and/or flexure in various configurations and tested under monotonic and cyclic loading. A newly developed fracture mechanics based model considers the global energy balance of the system and predicts the debonding failure load by characterizing the dominant mechanisms of energy dissipation during debonding. Validation of the model is performed using experimental data obtained from several independent experimental studies.
Citation - Scopus: 2
Health Monitoring of a Benchmark Structure Using Vibration Data
(2012) Gunes,B.; Department of Civil Engineering; 15. Graduate School of Natural and Applied Sciences; 01. Atılım University
Aging and deterioration of existing structures and the need for rapid assessment and evaluation of these structures for hazard mitigation has significantly expanded the research efforts in the field of structural health monitoring (SHM). SHM involves monitoring of a structure using periodically sampled measurements, extraction of damage sensitive features from these measurements, and assessment of the current health state/integrity of the system. The approach known as the Damage Locating Vector (DLV) technique is an SHM tool that interrogates changes in the flexibilities synthesized at sensor locations using the vibration data with respect to the location of damage. This paper presents the damage identification results of the Phase II Experimental Benchmark Structure of the IASC-ASCE Task Group on Structural Health Monitoring. © RILEM 2013.