Determination of limit-states for near-fault seismic fragility assessment of concrete gravity dams

Sotoudeh, Mohammad Ali; Ghaemian, Mohsen; Moghadam, Abdolreza S.

doi:10.24200/sci.2018.20701

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…The damages of the dam body usually occur in the base (heel and toe), in the crown and in the points where the slopes change. The cracks can propagate along the whole upstream and downstream face as shown in literature [45][46][47].…”

Section: Results Of the Damage Estimationmentioning

confidence: 99%

Artificial accelerograms to estimate damage of dams by using failure criteria

Zacchei

Molina

2018

Scientia Iranica

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in structures. Master's degree in structural engineering from University Roma Tre (UNIROMA3), Italy. Bachelor's degree in civil engineering from UNIROMA3. Five scholarships, with two of them for stays in public Brazilian R&D centers: EP-USP (two years) and University of São Paulo State (UNESP) (seven months). Reviewer of SCOPUS and WoS journals, researcher in the group of Dynamic Experimental Analysis of Structures at EP-USP and member of the Portuguese Society of Seismic Engineering (SPES). Six-year work experience in engineering, especially in the major area of civil projects and structures, hydraulic engineering and road infrastructure. Civil engineer and job leader in national and international companies. Currently, he is a PhD student at UNESP in Structures. Researcher with several scientific papers published in high impact journals and presentations at congresses. AbstractThe aim of this paper is to analyse dam's damage by using two recent methodologies. The first method has been used to define the performance and response curves of concrete gravity dams. The second method defines the seismic input which has been obtained from power spectral density function consistent with the response spectrum. Both methods set themselves as efficient, practical and useful to develop quite complicated analysis as the construction of the stochastic process to define the synthetic earthquake and the estimation of cracks in the dam's body. These methodologies have been explained and revised to improve their use. The fluid behaviour contained by arch-dams is compared with the fluid behaviour in storage tanks by studying the sloshing phenomenon which is usually neglected for dams. For the mathematical modelling, interactive programming language has been used.3

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Section: Results Of the Damage Estimationmentioning

confidence: 99%

Artificial accelerograms to estimate damage of dams by using failure criteria

Zacchei

Molina

2018

Scientia Iranica

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“…Another study tested pore water pressure in an earth dam to assess the mechanical stability using a 2D random FE method with Monte Carlo simulation [131]. Sotoudeh et al [132] evaluated the seismic behavior, demand, and capacity of concrete dams using incremental dynamic analysis with an FE model. The results showed that the exceeded probability of the limit-states curves measured at different intensities is a useful tool for probabilistic framework studies.…”

Section: D Dam Modelingmentioning

confidence: 99%

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

Ameen

Aldlemy

et al. 2020

Sustainability

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Dam and powerhouse operation sustainability is a major concern from the hydraulic engineering perspective. Powerhouse operation is one of the main sources of vibrations in the dam structure and hydropower plant; thus, the evaluation of turbine performance at different water pressures is important for determining the sustainability of the dam body. Draft tube turbines run under high pressure and suffer from connection problems, such as vibrations and pressure fluctuation. Reducing the pressure fluctuation and minimizing the principal stress caused by undesired components of water in the draft tube turbine are ongoing problems that must be resolved. Here, we conducted a comprehensive review of studies performed on dams, powerhouses, and turbine vibration, focusing on the vibration of two turbine units: Kaplan and Francis turbine units. The survey covered several aspects of dam types (e.g., rock and concrete dams), powerhouse analysis, turbine vibrations, and the relationship between dam and hydropower plant sustainability and operation. The current review covers the related research on the fluid mechanism in turbine units of hydropower plants, providing a perspective on better control of vibrations. Thus, the risks and failures can be better managed and reduced, which in turn will reduce hydropower plant operation costs and simultaneously increase the economical sustainability. Several research gaps were found, and the literature was assessed to provide more insightful details on the studies surveyed. Numerous future research directions are recommended.

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“…Fattahi and Gholizadeh assessed the seismic performance of optimally designed steel moment frames in three phases, including optimization to meet the performance requirements, derivation of the fragility curves, and generation of the fragility curves for different damage levels [23]. Sotoudeh et al [24] developed four limit states to be used in seismic performance evaluation of massive concrete dams using incremental dynamic analysis. It was applied to an integrated dam-reservoir finite-element model and was used to assess the probabilistic performance of the Pine Flat dam.…”

Section: Introductionmentioning

confidence: 99%

Comparison of seismic fragility of special moment frames in recent editions of ASCE 7 and ACI 318 regulations

Behnamfar

Nezhad

2022

NMCE

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The seismic safety levels provided by the three most recent editions of ACI and ASCE regulations for new moment frame structures are determined. Five special RC moment frames having 3, 5, 10, 15, and 20 stories are designed separately based on and the associated seismic regulations of UBC 97,. A suit of 10 consistent earthquake records is selected for non-linear dynamic analysis of buildings. Incremental dynamic analysis is conducted, and the corresponding fragility curves are calculated. The comparison of results shows that seismic safety of special moment frame buildings has considerably improved from ACI 318-99 to ACI 318-11, and from UBC 97 to ASCE 7-10, owing its larger part to the improvements made in the two latter versions of the mentioned building codes. However, the safety enhancement is not uniform and is much less for buildings with larger fundamental periods, especially for periods larger than 1.0 sec. For structures with fundamental periods smaller than 1 sec, the collapse ratio has increased up to more than 70%. For larger fundamental periods, the increase is less than 20%. Changes in ASCE7 with regard to the R-factor and coefficients of the load combination equations and its introduction of stricter requirements for the allowable story drift are pinpointed to be the most important factors. For the ACI codes, stricter requirements regarding the confinement of the plastic hinges and configuration of the longitudinal reinforcement are recognized to be the most influential changes. D

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Determination of limit-states for near-fault seismic fragility assessment of concrete gravity dams

Cited by 4 publications

References 26 publications

Artificial accelerograms to estimate damage of dams by using failure criteria

Artificial accelerograms to estimate damage of dams by using failure criteria

State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations

Comparison of seismic fragility of special moment frames in recent editions of ASCE 7 and ACI 318 regulations

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