Pseudo‐dynamic testing of a concrete gravity dam

Aldemir, Alper; Binici, Barış; Arıcı, Yalin; Kurç, Özgür; Canbay, Erdem

doi:10.1002/eqe.2553

Cited by 18 publications

(21 citation statements)

References 25 publications

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“…A 1/75 scaled model of the 120‐m‐high Melen Dam (Figure a) was tested using three different scaled ground motions by using the pseudo‐dynamic testing technique by Aldemir et al The original setup enabled the use of only the bottom half of the dam section and the inertial and hydrodynamic load effects were simulated using a lateral hydraulic piston. The overlapping lattice model was constructed by using a 25‐mm grid size to observe performance estimation for an un‐RC structural continuum.…”

Section: Validation Of the Overlapping Lattice Model With Structural mentioning

confidence: 99%

Overlapping Lattice Modeling for concrete fracture simulations using sequentially linear analysis

Aydin

Tuncay

Binici

2017

Structural Concrete

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Modeling concrete fracture is important in order to uncover accurately the sources of distress which lead to the damage or failure of structures. Many different numerical approaches have been used in the past employing either a smeared or a discrete cracking approach. Those models have difficulty in capturing the local nature of cracking, as well as the direction of crack propagation. Lattice modeling and peridynamics (PD) are some of the more recent nonlocal fracture simulation tools which possess advantages, such as ease of modeling and accuracy of crack propagation simulations with few key parameters. In this work, we employ an overlapping lattice approach, where the continuum is discretized using truss elements extending over a predefined horizon similar to the concept used in PD with the sequentially linear analysis technique. Simulation results for several reinforced concrete (RC) and un-RC tests demonstrate the ability to estimate crack propagation directions and widths accurately, with the proposed modeling approach also offering a rather simple and intuitive approach.The analytical simulation of concrete is very important for the structural engineering community as the key reasons of the aging infrastructure in many countries, creating billions of dollars' worth of repair and replacement costs, 1 are associated with concrete cracking. Computational models for structural concrete subjected to extreme and environmental loads must give results with reasonable accuracy for the performance evaluation, repair, strengthening of existing structures, or the design of modern ones. In this way, it is possible to attain economical engineering solutions.Starting from the 1960s, concrete finite element simulations were conducted in the two mainstream directions. The first approach was based on the adjustment of adjusting the material stiffness matrix (i.e., smeared crack concept) introduced by Rashid. 2 Later, Hillerborg 3 and Bažant and Oh 4 led the development of stress-displacement models, which were used to regularize mesh dependency through a characteristic length scale and the fracture energy. 5-7 There are essentially two methods for the smeared crack models, that is, rotational) 5,8 and fixed crack models 9,10 in order to estimate crack initiation and propagation directions. The main drawback of the continuum-based finite element modeling is the inability of representing the actual separation due to cracking and having to operate with average strains across a gauge length rather than with actual crack openings. The second approach for concrete fracture simulations is the use of discrete crack models by placing springs, interfaces, or contact elements between the finite elements to mimic the separation and crack opening. [11][12][13][14] Despite the apparent advantages of modeling, the cracks via discrete elements explicitly, the issues on identifying crack locations as à priori, remeshing, pre and postprocessing, and the necessity of defining different constitutive models for the cracks and continuum parts are...

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Section: Validation Of the Overlapping Lattice Model With Structural mentioning

confidence: 99%

Overlapping Lattice Modeling for concrete fracture simulations using sequentially linear analysis

Aydin

Tuncay

Binici

2017

Structural Concrete

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“…A 1/75 scaled model of the 120‐m‐high Melen Dam (Figure a) was tested using three different scaled ground motions in a pseudo‐dynamic setup . The special setup of the test enabled the use of only the bottom half of the dam section; the inertial and hydrodynamic load effects were simulated using a special loading apparatus.…”

Section: Validation Studiesmentioning

confidence: 99%

“…Here, PGA is the peak ground acceleration of the motion in cm/s 2 and S v,mean is the mean spectral velocity ranging from T 1 (5%) to 1.3 T 1 (5%) in cm/s. The estimate of the period as such for a damaged monolith was determined to yield better prediction results in parallel with the observations from testing . While undergoing damage, the cracks on the system open and close in the downstream and upstream directions instantaneously changing the frequency of the system.…”

Section: Nonlinear Behavior Of Concrete Monoliths During Seismic Excimentioning

confidence: 99%

Investigation of the relationship of seismic intensity measures and the accumulation of damage on concrete gravity dams using incremental dynamic analysis

Soysal

Binici

Arıcı

2015

Earthq Engng Struct Dyn

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Summary Nonlinear analysis tools are gaining prominence for the design and evaluation of concrete gravity dams. The performance limits of concrete gravity dams within the framework of performance based design are challenging to determine in comparison to those used for the assessments based on linear elastic analyses. The uncertainty in quantifying the behavior of these systems and the strong dependence of the behavior on the ground motion play an important role. The purpose of the study is to quantify the damage levels on a representative monolith using incremental dynamic analysis (IDA). For this purpose, the constitutive model utilized was calibrated first to the existing experimental results to verify the ability of the utilized cracking model to simulate the crack propagation process. Next, the relation between the damage levels on the monolith and the ground motion characteristics was investigated. The results of the conducted IDA showed that the engineering demand parameters (EDP) such as the crest displacement and acceleration showed weak correlation with the damage states. The spectral velocity and the peak ground acceleration were determined to be better predictors for the damage on the monolith. Copyright © 2015 John Wiley & Sons, Ltd.

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“…They studied the damage propagation, sliding displacement, and stability of dams, showing that there is a good agreement between experimental and analytical results. To be more precise, in spite of the fact that there was major cracking at the base of the monolith, no noticeable sliding or problem that could jeopardize the stability of the dam was observed [2].…”

Section: Introductionmentioning

confidence: 99%

A Survey of Matlab Efficiency in Damage Detection of Concrete Gravity in Concrete Gravity Dams

Esmaielzadeh

Ahmadi

Hosseini

2019

IIUMEJ

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Detection of damage in concrete gravity dams (CGDs) is one of the challenges that need to be overcome since dam failure may lead to irreversible consequences. This research aims to detect structural damage within CGDs by wavelet analysis. From a structural point of view, stiffness is an important factor in the dynamic behaviour of concrete gravity dam systems. Any sudden change in the stiffness leads to alteration in the dynamic response of the structures. The proposed analysis of such a condition will help to investigate the responses before and after the occurrence of any structural damage. The main contributions of this paper are to detect the existence of any damage in the dam structure and determine the damage location along the height of the dam. In order to achieve these purposes, three finite element models of the Pine Flat, Bluestone, and Folsom dams are chosen as case studies. These dams have been modelled for both intact and damaged states, and their geometrical, physical, and mechanical characteristics are defined by SAP2000 software. A series of modal analyses was performed to determine the frequencies and shapes of the structural motions. After reduction of the elasticity modulus by 20% and 50%, the Discrete Wavelet Transform (DWT) was applied to the difference between the intact and damaged observations. Then, the DWT outputs were analysed to get information about the existence of damage as well as its location in the dam structure. Overall, from the obtained results, the main finding of this study states that the location and severity of the structural damages have been efficiently detected according to the significant amplitude variations in DWT diagrams. ABSTRAK: Pengesanan kerosakan pada empangan graviti konkrit (CGDs) adalah salah satu cabaran yang perlu diatasi disebabkan kegagalan empangan yang boleh membawa kepada akibat buruk. Kajian ini bertujuan bagi mengesan kerosakan struktur dalam CGDs menggunakan analisis wavelet. Dari sudut pandang struktur, struktur yang kukuh adalah faktor penting dalam sifat dinamik sistem empangan graviti konkrit. Sebarang perubahan secara tiba-tiba pada struktur bangunan membawa kepada perubahan tindak balas dinamik struktur. Analisis yang dicadangkan terhadap keadaan ini membantu dalam memberi tindak balas sebelum dan selepas jika berlaku sebarang kerosakan struktur. Sumbangan utama kajian ini adalah bagi mengesan jika terdapat sebarang kerosakan pada struktur dalam empangan dan menentukan lokasi kerosakan sepanjang ketinggian empangan. Bagi mencapai matlamat ini, tiga model unsur terhingga daripada empangan Pine Flat, Bluestone dan Folsom telah dipilih sebagai kes kajian. Kesemua empangan ini dimodelkan bagi kedua-dua keadaan iaitu ketika baik dan rosak. Ciri geometri, fizikal dan ciri-ciri mekanikal juga telah ditakrif menggunakan perisian SAP2000. Satu siri model analisis telah dijalankan bagi menentukan frekuensi dan bentuk gerakan struktur. Selepas pengurangan modulus keanjalan sebanyak 20% dan 50%, Transformasi Wavelet Diskret (DWT) telah digunakan bagi mengesan perbezaan antara keadaan baik dan rosak. Kemudian, hasil dari DWT ini dianalisis bagi mendapatkan maklumat mengenai kewujudan kerosakan pada empangan dan juga lokasi kerosakan dalam struktur empangan. Secara keseluruhan, hasil kajian berjaya menentukan lokasi dan tahap kerosakan struktur dengan cekap mengikut variasi amplitud ketara dalam rajah DWT.

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Pseudo‐dynamic testing of a concrete gravity dam

Cited by 18 publications

References 25 publications

Overlapping Lattice Modeling for concrete fracture simulations using sequentially linear analysis

Overlapping Lattice Modeling for concrete fracture simulations using sequentially linear analysis

Investigation of the relationship of seismic intensity measures and the accumulation of damage on concrete gravity dams using incremental dynamic analysis

A Survey of Matlab Efficiency in Damage Detection of Concrete Gravity in Concrete Gravity Dams

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