Quantitative comparison of 2D and 3D modeling for concrete gravity dams

Download

index.pdf

Date

2014

Author

Evliya, Ekin Erdem

Metadata

Show full item record

Item Usage Stats

192
views

84
downloads

Seismic behavior of gravity dams has long been evaluated and predicted using a representative 2D monolith for the dam. 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 in 2D space as well as the expected computational costs of building a three dimensional model. A significant number of roller compacted concrete dams are being designed based on these procedures regardless of the valley dimensions, joint-spacing or joint details. Based on the premise that the assumption is overstretched for practical purposes in a variety of settings, the purpose of this study is to critically evaluate the behavior of monoliths within a dam and determine the representativeness of this assumption. A generic 80m high dam was considered in different valley settings, corresponding to multiples of the dam height. For a range of selected ground motions, the difference between the responses of individual monoliths to the full monolithic dam solution was compared in a 3D analyses setting. The results were compared to the commonly used 2D solutions. The results showed that the 2D assumption generally yielded better estimates to the 3D case for the independent monoliths and wide valleys whereas it showed large discrepancies with respect to 3D models for the fully monolithic case and narrow valleys.

Subject Keywords

Hydraulic structures., Seismology., Gravity dams., Concrete dams., Earthquake resistant design., Concrete dams

URI

http://etd.lib.metu.edu.tr/upload/12618343/index.pdf
https://hdl.handle.net/11511/24348

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Seismic testing of a scaled roller-compacted-concrete gravity dam Gharibdoust, Ali; Binici, Barış; Department of Civil Engineering (2016) Within the last half-century, seismic response analysis of concrete gravity dams has been extensively studied. Studies reveal that two types of failure modes prevail in the form of dam body cracking or base slide. The literature lacks the conditions that clearly differentiate the two failure types. In this context a state of the art single degree of freedom pseudo-dynamic testing was developed to assess the gravity dam response on smooth foundation interface. Three different hazard levels of earthquake name...
Performance of concrete gravity dams under earthquake effects Soysal, Berat Feyza; Arıcı, Yalın; Department of Civil Engineering (2014) Concerns about the seismic safety of gravity dams have increased with the construction of numerous new dams in the developing world as well as the need for the evaluation of existing dam stock in the developed countries. The common procedure for the design of concrete gravity dams has been linear analyses: there is scant experience on the design of such systems using nonlinear analyses as the post-linear behavior and performance limits of gravity dam monoliths are not well known. This study is focused on th...
Ground motion scaling for the prediction of the seismic response of concrete gravity dams Duygu, Mustafa Berk; Arıcı, Yalın; Department of Civil Engineering (2014) Designing dams for seismic safety gains importance as the number of dams are increasing as a result of increasing need in water storage and hydropower. To define a structure’s seismic safety, scaling of accelerograms should be considered as one of the most crucial elements. Appropriate scaling of ground motion records is required to better estimate the linear and nonlinear structural response of a structure. Although, in literature, there exist numerous methods dealing with this issue, it is required to det...
3d modeling and ground motion scaling for the prediction of seismic demands on the gravity dams Bybordiani, Milad; Arıcı, Yalın; Department of Civil Engineering (2016) Seismic behavior of gravity dams has long been evaluated using the classical two dimensional modeling approach and time history analyses the assumptions for which have been rarely challenged. Formulated for the gravity dams built in wide-canyons, 2D modeling is 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 roller compacted concrete (RCC) dams, characterized as such...
Pseudo-dynamic testing of a concrete gravity dam Aldemir, Alper; Binici, Barış; Arıcı, Yalın; Kurç, Özgür; Canbay, Erdem (2015-09-01) Inspired from the simplified single degree of freedom modeling approach used in the preliminary design of concrete gravity dams, a pseudo-dynamic testing method was devised for the seismic testing of a concrete gravity dam section. The test specimen was a 1/75 scaled section of the 120-m-high monolith of the Melen Dam, one of the highest concrete gravity dams to be built in Turkey. The single degree of freedom idealization of the dam section was validated in the first stage of the study using numerical simu...

Citation Formats

E. E. Evliya, “Quantitative comparison of 2D and 3D modeling for concrete gravity dams,” M.S. - Master of Science, Middle East Technical University, 2014.