Modal identification of concrete arch dam by fully automated operational modal identification

Mostafaei, Hasan; Ghamami, Mehdi; Aghabozorgi, P.

doi:10.1016/j.istruc.2021.03.028

Cited by 41 publications

(10 citation statements)

References 21 publications

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“…. = K d f (11) In equation 11, K is the stiffness matrix, d, defined in equations 1 and 2, is the vector of nodal unknowns, and f is the force vector. Details of equation 11 in the XFEM are described precisely in the following sections.…”

Section: Displacement Components In Lefm-based Xfemmentioning

confidence: 99%

“…The possible mitigation of floods by dams and the risk to dams from floods are fundamental problems that need to be addressed [8]. Some attempts have been made to find the failure scenario of a concrete arch [9,10,11] or gravity dam [12,13]. However, there is no comprehensive study investigating the behavior of concrete gravity dams under flood loading.…”

Section: Introductionmentioning

confidence: 99%

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Push-over analysis of concrete gravity dams due to flood inflow

Daroonkola

Ahmadi²

2022

NMCE

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This study numerically predicts the failure scenario of a cracked concrete gravity dam through a push-over nonlinear analysis. The mixed-mode Linear Elastic Fracture Mechanics (LEFM) was employed using the extended finite element method (XFEM). The dam base was considered to be fully fixed without any foundation effects. The hydrostatic pressure on the dam's upstream face was increased incrementally. The failure scenario type of the concrete gravity dams with an initial crack at an arbitrary level exhibited a ductile manner. A mixed-mode crack path with a positive mode II was observed in all initial crack levels. Based on the results, it can be claimed that provided water intrusion prevented, "cracked" concrete gravity dams may not be at noticeable risk of failure due to flood inflow.

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Section: Displacement Components In Lefm-based Xfemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Push-over analysis of concrete gravity dams due to flood inflow

Daroonkola

Ahmadi²

2022

NMCE

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“…Relations (28) are valid when all terms have devised for propagating waves in GN condition as in Eq. ( 13).…”

Section: Gn Type Truncation-element 31 Extraction Of Basic Relationsmentioning

confidence: 99%

“…Some of these works relate to linear analysis by Wavenumber approach [23], direct finite element method [24,25] or HW high-order boundary condition [26]. There are others related to nonlinear response [27], modal identification [28] or even mode shapes of this particular dam [29].…”

Section: Introductionmentioning

confidence: 99%

Time harmonic analysis of concrete arch dam-reservoir systems by utilizing GN high-order truncation condition

Lotfi¹,

Lotfi²

2022

Scientia Iranica

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In present study, the dynamic analysis of concrete arch dam-reservoir systems is formulated by FE-(FE-TE) approach. In this technique, dam and reservoir are discretized by solid and fluid finite elements. Moreover, the GN high-order condition imposed at the reservoir truncation boundary. This task is formulated by employing a truncation element at that boundary. It is emphasized that reservoir far-field is excluded from the discretized model. The formulation is initially explained in details. Subsequently, the response of idealized Morrow Point arch damreservoir system is obtained for two fully reflective and absorptive reservoir bottom/sidewalls conditions for all three types of excitations. Different Orders of GN condition are considered and convergence process is evaluated. Furthermore, the results are compared against exact solutions which are based on rigorous FE-(FE-HE) approach. It is shown that the technique converges prior to beginning of instability problems which is known to exist for high orders in GN condition. It must be emphasized that although time harmonic analysis is considered in the present study, the main part of formulation is explained in the context of time domain. Therefore, the approach can easily be extended for transient type of analysis.

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“…Moreover, GFRP-RC columns, which are exposed to large eccentricities experienced significant reduction in their ultimate load capacity caused by the non-uniform stress contribution [30]. Also, a number of numerical studies have simulated GFRP reinforced concrete columns and beams using three-dimensional finite-element analysis (FEA) in ABAQUS to predict post-peak responses and the degraded stiffness of cracked concrete through modified concrete damage plasticity (CDP) model [31][32][33][34]. Amiri et al [35] predicted the flexural response of a reinforced Geopolymer concrete beam using FEA in ABAQUS software.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of GFRP bars contribution on performance of concrete structural elements

Aghabozorgi

Khaloo

Hassanpour

2021

NMCE

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In this study, twenty glass fiber reinforced polymer (GFRP) reinforced concrete specimens were modelled using finite element method to predict the effect of GFRP compressive bars on the flexural strength and ductility of GFRP reinforced concrete beams. Also, the contribution of GFRP longitudinal rebars to the load-carrying capacity of reinforced concrete columns is determined. The concrete elastoplastic behaviour after the peak load was defined using the concrete damaged plasticity model in ABAQUS software. The FE results were validated using the experimental data reported in the literature. The results demonstrated a close agreement between the load-displacement curves obtained from numerical analysis and the tests. An increase in the percentage of GFRP compressive reinforcement resulted in slightly higher energy absorption and ductility in the GFRP concrete beams. According to the FE analysis, increasing GFRP compressive reinforcement has a minor influence on the flexural strength of beams. Moreover, decreasing the percentage of longitudinal reinforcement leads to a reduction in the strength and ductility of columns, and higher loss in strength was observed when greater eccentricity was applied in columns.

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Modal identification of concrete arch dam by fully automated operational modal identification

Cited by 41 publications

References 21 publications

Push-over analysis of concrete gravity dams due to flood inflow

Push-over analysis of concrete gravity dams due to flood inflow

Time harmonic analysis of concrete arch dam-reservoir systems by utilizing GN high-order truncation condition

Numerical investigation of GFRP bars contribution on performance of concrete structural elements

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