Browsing by Publisher "American Society of Civil Engineers (ASCE)"
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Item Development of water-resources planning models in england with special reference to environmental issues(American Society of Civil Engineers (ASCE), 1999) Yurdusev M.A.History of water-resources planning for England and Wales in England exhibits a good example in terms of both the methods used and their applications. Early modelling studies date back to the sixties. Since then several models have appeared, three of which in this paper have been reviewed. By emphasising how the environmental issues being treated, the applications of the models to the whole country are mentioned. © 1999 American Society of Civil Engineers.Item Pore fluid chemistry and aging effects on swelling, shear strength, and pore size distribution behavior of soils(American Society of Civil Engineers (ASCE), 2014) Çakar E.; Pulat H.F.; Aksoy Y.Y.Investigation of aging effect is important due to examination of long-term influence of contaminants on the landfill liners. The effect of Na+ and Ca2+ ions on the engineering behavior of soils were examined and the aging effect on engineering properties of kaolin and bentonite samples in the presence of ions were observed. The pore size distribution, swelling and shear strength parameters were determined under the same conditions after approximately 60, 190 (shear strength), and 250 (swelling) days. There is no difference at the swell index values of kaolin in the presence of DI water and 0.5 M NaCl. However, Ca2+ ions decreased the swell index of the kaolin sample. In the presence of Na+ ions, there is no difference at the swell index values of the bentonite sample. However, in the presence of Ca2+ ions, swell index decreased from 0.035 to 0.029. During aging, the reverse effect occurs at bentonite sample when compared with kaolin sample. It is expected that, as aging progresses, bonds between particles increase; therefore, the swell index of the soils decrease. However, the results of this study have shown that this is not true for bentonitic samples. When the results of 0 day, 60 and 190 days samples were compared, the \xQ' values of kaolin and bentonite samples decreased by time. © 2014 American Society of Civil Engineers.Item Effect of Hysteretic Models on Seismic Behavior of Existing RC Structures(American Society of Civil Engineers (ASCE), 2015) Ergun S.; Demir A.The aim of this study is to investigate the effect of hysteretic models on displacement demands of reinforced concrete (RC) structures having various irregularities and determine more proper hysteretic models for different types of RC structures. The RC structures having irregularities such as soft story and overhang were analyzed with nonlinear pushover and nonlinear time-history methods. Concrete compressive strength, stirrup amount, and the number of stories for the structures were variable parameters. Totally, 25,664 analyses were carried out. Displacement capacities and performance levels of structures were determined using nonlinear pushover analysis. Exceedance ratios of performance levels and displacements demanded from the structures of 100 severe ground motions that occurred worldwide were obtained using nonlinear time-history analysis (NTHA). In NTHA, various hysteretic models were used to define inelastic behavior of RC structures. The analyses show that the hysteretic models have a significant effect on displacement demands of RC structures. Finally, proper hysteretic models are suggested according to the type of structure and purpose of occupancy. © 2014 American Society of Civil Engineers.Item Low-Cycle Fatigue Testing of Shear Links and Calibration of a Damage Law(American Society of Civil Engineers (ASCE), 2018) Bozkurt M.B.; Kazemzadeh Azad S.; Topkaya C.This paper experimentally studies the low-cycle fatigue (LCF) behavior of shear links in eccentrically braced frames (EBFs) with the aim of calibrating a convenient damage law for estimating the exhausted as well as remaining life of these members under any loading history. A total of 14 specimens are tested using a nearly full-scale EBF setup under constant-amplitude cycles as well as proportional and arbitrary loading histories. A generalized damage law is subsequently calibrated using results of the present study as well as a comprehensive data compilation of previous experiments for predicting the occurrence of link fracture under earthquake-induced loading histories. The approach forms a basis for the development of acceptance criteria based on cumulative measures which can be incorporated into the current performance-based design and evaluation procedures. For further validation, the procedure is applied to the case of EBF links fractured during the Christchurch earthquakes. Finally, the current standards for EBF shear links are discussed based on the findings of the LCF tests. © 2018 American Society of Civil Engineers.Item Performance enhancement of a conceptual hydrological model by integrating artificial intelligence(American Society of Civil Engineers (ASCE), 2019) Kumanlioglu A.A.; Fistikoglu O.A daily rainfall-runoff model has been improved by the integration of artificial neural network (ANN) and genetic algorithm (GA). The integrations are carried out on the daily rainfall-runoff model Génie rural à 4 paramètres journalier (GR4J). GR4J consists of production and routing storages. The production storage has only one process parameter and the routing storage has three. The ANN integration eliminates the three routing parameters. Automatic calibration capability has been added to the new hybrid model by integrating GA. The new hybrid model, which uses antecedent rainfall and temperature series, is applied to the Gediz River Basin in western Turkey. The results reveal that the hybrid model has better prediction performance than the original GR4J as well as the single ANN-based runoff prediction model. © 2019 American Society of Civil Engineers.Item Closure to "performance Enhancement of a Conceptual Hydrological Model by Integrating Artificial Intelligence" by Ahmet Ali Kumanlioglu and Okan Fistikoglu(American Society of Civil Engineers (ASCE), 2020) Kumanlioglu A.; Fistikoglu O.[No abstract available]