000019192 001__ 19192
000019192 005__ 20170118182303.0
000019192 04107 $$aeng
000019192 046__ $$k2017-01-09
000019192 100__ $$aArıcı, Yalın
000019192 24500 $$aThe Use of 3D Modeling for the Prediction of the Seismic Demands on the Gravity Dams

000019192 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019192 260__ $$b
000019192 506__ $$arestricted
000019192 520__ $$2eng$$aSeismic behavior of gravity dams has long been evaluated using a representative 2D monolith for the system. Formulated for the gravity dams built in wide-canyons, the assumption is nevertheless utilized extensively for almost all concrete dams due to the established procedures as well as the expected computational costs of a three dimensional model. However, a significant number of RCC dams, characterized as such systems, do not conform to the basic assumptions of these methods by violating the conditions on canyon dimensions and joint-spacing/ details. Based on the premise that the 2D modeling assumption is overstretched for practical purposes in a variety of settings, the purpose of this study is to critically evaluate the use of 2D modeling for the prediction of the seismic demands on these systems. Using a robust SSI approach, the difference between the 2 and 3D response for gravity dams are investigated first in the frequency domain. Rigorous frequency domain solutions for both cases were used in order to compare the frequency response functions for the crest response quantities. In the 3D configuration, monolithic models with no construction joints as well as models composed of independent monoliths were used as the two ideal cases in order to investigate the behavior of the 3D model. The effect of the narrowness of the canyon as well as the foundation rigidity was evaluated for a range of canyon widths and foundation moduli and the differences between the natural frequencies and the damping ratios between the two modeling approaches were presented. As the engineering decision parameters on such systems are based on time domain parameters such as the stresses and displacements, next, a time domain comparison between the responses of 2 and 3D models were obtained using 70 different ground motions. The maximum crest displacement and toe stress values for the 2 and 3D models were compared for different canyon widths and foundation moduli. The scatter of the differences between the 2 and 3D model results were presented for different ground motions in order to show the possible bias introduced into the analysis results due to the modeling approach. The results of the study show that even for relatively wide canyons, the 2D analysis can lead to misleading predictions.

000019192 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019192 653__ $$aRCC Dam, seismic design; soil-structure interaction; 2D vs. 3D analyses; frequency domain

000019192 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019192 720__ $$aArıcı, Yalın$$iBybordiani, Milad
000019192 8560_ $$ffischerc@itam.cas.cz
000019192 8564_ $$s1110526$$uhttps://invenio.itam.cas.cz/record/19192/files/3058.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3058.
000019192 962__ $$r16048
000019192 980__ $$aPAPER