Teses / dissertações sobre o tema "Seismic fragility curve"
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Ay, Bekir Ozer. "Fragility Based Assessment Of Low". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607629/index.pdf.
Texto completo da fontespecific characteristics is investigated to manage the earthquake risk and to develop strategies for disaster mitigation. Low&ndash
rise and mid&ndash
rise reinforced concrete structures, which constitute approximately 75% of the total building stock in Turkey, are focused in this fragility&ndash
based assessment. The seismic design of 3, 5, 7 and 9&ndash
story reinforced concrete frame structures are carried out according to the current earthquake codes and two dimensional analytical models are formed accordingly. The uncertainty in material variability is taken into account in the formation of structural simulations. Frame structures are categorized as poor, typical or superior according to the specific characteristics of construction practice and the observed seismic performance after major earthquakes in Turkey. The demand statistics in terms of maximum interstory drift ratio are obtained for different sets of ground motion records. The capacity is determined in terms of limit states and the corresponding fragility curves are obtained from the probability of exceeding each limit state for different levels of ground shaking. The results are promising in the sense that the inherent structural deficiencies are reflected in the final fragility functions. Consequently, this study provides a reliable fragility&ndash
based database for earthquake damage and loss estimation of reinforced concrete building stock in urban areas of Turkey.
Saler, Elisa. "Seismic vulnerability and fragility of school buildings in Italy. A multiscale approach to assessment, prioritisation, and risk evaluation". Doctoral thesis, Università degli studi di Trento, 2022. http://hdl.handle.net/11572/348119.
Texto completo da fonteAvsar, Ozgur. "Fragility Based Seismic Vulnerability Assessment Of Ordinary Highway Bridges In Turkey". Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610693/index.pdf.
Texto completo da fonte伊藤, 義人, Yoshito ITOH, 光永 和田 e Mitsunaga WADA. "イベントを考慮した交通基盤施設のライフサイクル評価手法に関する研究". 土木学会, 2003. http://hdl.handle.net/2237/8633.
Texto completo da fonteBélec, Gilbert. "Seismic Assessment of Unreinforced Masonry Buildings In Canada". Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34301.
Texto completo da fonteCeran, H. Burak. "Seismic Vulnerability Of Masonry Structures In Turkey". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612745/index.pdf.
Texto completo da fontevulnerability score&rdquo
, has been proposed in order to compare the seismic safety of unreinforced masonry buildings in Fatih sub province of Istanbul and to assess the influence of out-of-plane behavior together with the in-plane behavior of these existing masonry buildings.
Ucer, Serkan. "Seismic Response And Vulnerability Assessment Of Tunnels:a Case Study On Bolu Tunnels". Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615005/index.pdf.
Texto completo da fontezce, occurred during the construction of the tunnels. The August 17, 1999 earthquake was reported to have had minimal impact on the Bolu Tunnels. However, the November 12, 1999 earthquake caused some sections of both tunnels to collapse. The remaining sections of the tunnels survived with various damage states which were subsequently documented in detail. This valuable damage data was thoroughly utilized in this study. To develop analytical fragility curves, the methodology described by Argyroudis et al. (2007) was followed. Seismic response of the Tunnels was assessed using analytical, pseudo-static and full-dynamic approaches. In this way, it was possible to make comparisons regarding the dynamic analysis methods of tunnels to predict the seismically induced damage. Compared to the pseudo-static and full-dynamic methods, the predictive capability of the analytical method is found to be relatively low due to limitations inherent to this method. The pseudo-static and full-dynamic solution results attained appear to be closer to each other and better represented the recorded damage states in general. Still, however, the predictive capability of the pseudo-static approach was observed to be limited for particular cases with reference to the full-dynamic method, especially for the sections with increasingly difficult ground conditions. The final goal of this study is the improvement of damage indexes corresponding to the defined damage states which were proposed by Argyroudis et al. (2005) based on the previous experience of damages in tunnels and engineering judgment. These damage indexes were modified in accordance with the findings from the dynamic analyses and actual damage data documented from Bolu Tunnels following the Dü
zce earthquake. Three damage states were utilized to quantify the damage in this study.
Huh, Jungwon, Quang Tran, Achintya Haldar, Innjoon Park e Jin-Hee Ahn. "Seismic Vulnerability Assessment of a Shallow Two-Story Underground RC Box Structure". MDPI AG, 2017. http://hdl.handle.net/10150/625742.
Texto completo da fonteAl, Mamun Abdullah. "Seismic Damage Assessment of Reinforced Concrete Frame Buildings in Canada". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36188.
Texto completo da fonteSANCIN, LJUBA. "SEISMIC VULNERABILITY EVALUATION OF R.C. AND MASONRY BUILDINGS IN THE CENTRE OF GORIZIA". Doctoral thesis, Università degli Studi di Trieste, 2021. http://hdl.handle.net/11368/2998137.
Texto completo da fonteThe aim of this research study is to investigate the vulnerability of the building heritage in Gorizia, a town in north-eastern Italy, on the border with Slovenia. This town has not been considered seismic until the year 2003 and then in 2010 it has been classified in a higher seismicity class. For this reason, most of the buildings are not designed to resist seismic action at all and an even lower percentage fulfils the requirements of the current technical standard. Four real existing buildings are analysed as case study buildings, representative of the main structural types that can be found in the town. Two of them are high - rise (11 and 12 storeys) reinforced concrete (RC) framed buildings with a brittle concrete stairwell, designed for gravitational load only and built in the 60’s-70’s. In the last years, a growing attention has been payed to the seismic vulnerability of existing RC framed structures, but this type of buildings, with a core of concrete walls, has been investigated much less, although it is a structural type that is very spread. The other two case studies are masonry buildings built in 1740 and in 1903, respectively. One of the masonry buildings is the city hall of Gorizia, on which many in-situ tests have been performed within a project of the Department of Engineering and Architecture with the Municipality of Gorizia. For both RC buildings, some considerations are made about the influence of the masonry infills on the seismic behaviour of the building and of the numerical model. The vibration periods found with numerical modelling are also compared to the periods evaluated with vibrational measurements. The two numerical models without infills are then analysed with non-linear static and dynamic analyses. The results are processed with a cloud analysis in order to calculate fragility curves of the buildings, that show a very brittle behaviour. The two masonry buildings are analysed also with pushover analysis. For the evaluation of the seismic vulnerability of the analysed buildings, two types of seismic hazard assessments have been considered for the extraction of the seismic inputs: Probabilistic Seismic Hazard Assessment (PSHA) method, by the Italian code response spectra and Neo Deterministic Seismic Hazard Assessment (NDSHA) method, with response spectra of two specific possible scenarios for the town of Gorizia. The physics-based scenarios are calculated for the two faults that are the closest to Gorizia: Idrija and Medea. A comparison is made between the demand given by the seismic inputs defined with the two methods. The importance of using both methods for the design of low-damage retrofitting solutions is highlighted. At last, a theoretical study has been carried out within the present research study in order to find an innovative and effective solution for the retrofit of the RC high-rise brittle buildings. It consists in the application of an exo - or endo - skeleton, with the additional introduction of a sliding system at the base of the RC building, in order to decouple its motion from the ground motion. In this way, the exo- or endo-skeleton can be designed independently from the features of the existing building, that remains undamaged. The characteristics of the exo/endo-skeleton can be calibrated on the seismic input of the site of interest, with the possibility to adapt it to new seismic classifications of the territory.
Tran, Anh-Dung. "Application de l'apprentissage automatique pour la construction des courbes de fragilité sismique". Electronic Thesis or Diss., université Paris-Saclay, 2024. https://www.biblio.univ-evry.fr/theses/2024/interne/2024UPAST017.pdf.
Texto completo da fonteThe evaluation of seismic risks for structures is necessary to prevent human and material losses in the event of natural disasters. The construction of seismic fragility curves, the tool that defines the probability of failure of a structure based on earthquake intensity, plays a significant role in this assessment. Generally, the method of constructing these curves requires costly procedures, often involving finite element analyses, which require considerable time and computing resources. This difficulty hinders the real-time use of this tool or its application for more common structures.Machine learning has experienced a remarkable development with its application in various fields. It is recognized as a powerful tool for modeling complex relationships between inputs and outputs from data. An innovative approach is emerging: the use of machine learning models to predict structural responses to earthquakes. Therefore, the main motivation of the thesis is to study the application of machine learning to generate seismic responses for seismic risk assessment, specifically for constructing fragility curves.The study begins with a literature review, which presents seismic fragility curves and the challenge related to the computational burden for their construction. After a brief introduction to machine learning, the first chapter focuses on its application to model seismic responses of structures. Given the sometimes contradictory wide range of characteristics, it is necessary to propose practical procedures with the most relevant and easy-to-implement features.The thesis addresses this issue and proposes an innovative approach to efficiently use and select the acceleration response spectrum sampled at different periods to build machine learning models. Two procedures, named PRO-LIN and PRO-NONLIN, are proposed for linear and nonlinear structures respectively. To validate these proposals, tests are performed on linear and nonlinear structures combined with synthetic records, demonstrating a significant reduction in simulation time while maintaining accuracy in constructing fragility curves.Although the initial validations of the procedures are conducted with synthetic records, validation with real records is essential to validate these proposals. The records are selected according to the conditional spectrum from databases. Finally, another validation aims to test the proposed procedures with existing databases in the literature. The first database concerns a linear reinforced concrete structure. The second database concerns nonlinear moment-resistant steel frames.In conclusion, based on the results obtained in the studies, this work highlights the effectiveness of the proposed procedures in the thesis. These procedures effectively improve the construction of seismic fragility curves and seismic risk assessment
Nielson, Bryant G. "Analytical Fragility Curves for Highway Bridges in Moderate Seismic Zones". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7542.
Texto completo da fonteRamanathan, Karthik Narayan. "Next generation seismic fragility curves for california bridges incorporating the evolution in seismic design philosophy". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44883.
Texto completo da fonteErrata added at request of advisor and approved by Graduate Office, March 15 2016.
Wang, Mengg. "Deep Learning-based Time-dependent Seismic Fragility Analysis of Aging Highway Bridges". Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/24334.
Texto completo da fonteRafie, Nazari Yasamin. "Seismic Fragility Analysis of Reinforced Concrete Shear Wall Buildings in Canada". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36090.
Texto completo da fonteBRUNELLI, ANDREA. "SEISMIC FRAGILITY CURVES ACCOUNTING FOR SITE AND SOIL STRUCTURE INTERACTION EFFECTS ON URM BUILDINGS". Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1093913.
Texto completo da fonteWright, Alexander David. "Comparison of Performance-Based Liquefaction Initiation Analyses Between Multiple Probabilistic Liquefaction Models Using the Standard Penetration Test". BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3710.
Texto completo da fonteMammone, Angelo. "Innovative probabilistic methodologies to assess seismic vulnerability of simple supported girder bridges". Doctoral thesis, Universita degli studi di Salerno, 2019. http://elea.unisa.it:8080/xmlui/handle/10556/4279.
Texto completo da fonteSince the end of the eighties, numerous studies have been conducted analysing the relationship between the infrastructures and the economic development of the territory, highlighting its close correlation. In the last decades, the costs for the management and maintenance of these networks have increased considerably considering the age of the same and the increase in demand that has been witnessed. The phenomenon is particularly evident in some elements of transport networks such as bridges, viaducts and tunnels, which, as evidenced by the telluric events that have hit Italy in recent decades, have shown a high level of vulnerability also towards media events. Intensity. The problems encountered are essential because the Italian infrastructural network is constituted for the vast majority of bridges built in the 60s and 80s, structures conceived in seismic territories generally only afterwards and, therefore, without seismic engineering criteria. Furthermore, the lack of routine maintenance policies and practices has accentuated the decay of structural services in some cases. This thesis study focuses on the analysis of the efficiency of adaptation and improvement techniques for multi-span bridges simply supported, built in Italy in the 60s-80s, a simple bridge/viaduct suite was used. Defined according to the geometric and mechanical characteristics detected by the bridges built on the Italian motorway and road network. To evaluate the structural performance of bridges and viaducts, the probabilistic method from the basis of Performance Based Earthquake Engineering (PBEE) was used, in particular through the use of fragility curves. The purpose of bridging curves for bridges, however, shows some limitations, since they are complex structures composed of several structural elements that interact with each other, so it is difficult to determine the collapse mechanisms of the whole system. To simplify the comprehension of the global collapse mechanism, thus facilitating the general evaluation of the improvement proposals related to the single structural components, we propose an innovative method of analysis and graphic representation of the fragility curves. [edited by Author]
XXXI ciclo
Bowers, Matthew E. "Seismic fragility curves for a typical highway bridge in Charleston, SC considering soil-structure interaction and liquefaction effects". Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202500829/.
Texto completo da fonteTELESCA, ALESSIO. "ADVANCED MODELLING OF OVER-STROKE DISPLACEMENT CAPACITY FOR CURVED SURFACE SLIDER DEVICES". Doctoral thesis, Università degli studi della Basilicata, 2022. http://hdl.handle.net/11563/153765.
Texto completo da fonteFREDDI, FABIO. "Local engineering demand parameters for seismic risk evaluation of low ductility reinforced concrete buildings". Doctoral thesis, Università Politecnica delle Marche, 2012. http://hdl.handle.net/11566/242022.
Texto completo da fonteNardin, Chiara. "Seismic experimental analyses and surrogate models of multi-component systems in special-risk industrial facilities". Doctoral thesis, Università degli studi di Trento, 2022. https://hdl.handle.net/11572/362462.
Texto completo da fonteMaio, Rui André Simões Dias. "Seismic vulnerability assessment of old building aggregates". Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12839.
Texto completo da fonteThe present dissertation approaches the assessment of the seismic vulnerability of old stone masonry building aggregates. With this topic it is presented a review on the most recent methods and tools used for the seismic vulnerability assessment of masonry buildings, focusing the research developed both in Italy and Portugal. Moreover, a case study of an old stone masonry building aggregate was assessed, which is located in San Pio delle Camere (Abruzzo, Italy), slightly a ected by the 6th April 2009 L'Aquila earthquake. This building aggregate was modelled using the STA DATA software 3muri®. On one hand, static non-linear numerical analysis was performed to obtain capacity curves and a prediction of the damage distribution in the structure, caused by the input seismic action (hybrid method), on the other hand indirect methods were used, based on di erent vulnerability index formulations.
A presente dissertação insere-se no estudo da avaliação da vulnerabilidade sísmica de agregados de edifícios antigos de alvenaria de pedra. É feita uma revisão geral da literatura sobre os mais recentes estudos e ferramentas para a avaliação da vulnerabilidade sísmica de agregados de edifícios de alvenaria de pedra, enfatizando o trabalho de investigação desenvolvido em Itália e em Portugal nesta temática. É avaliada a vulnerabilidade sísmica de um caso de estudo de um agregado de edifícios, localizado em San Pio delle Camere (na região de Abruzzo, em Itália), afectado pelo sismo de L'Aquila e modelado com o recurso ao programa da STA DATA 3muri®. Numa primeira fase, a avaliação da vulnerabilidade sísmica do agregado foi conseguida através de uma metodologia híbrida, que estima as curvas de fragilidade com base nos deslocamentos espectrais resultantes de análises estáticas não-lineares. Posteriormente foram aplicados métodos indirectos, baseados na estimativa de um índice de vulnerabilidade, para diferentes formulações correntes.
La presente tesi di laurea magistrale si propone di contribuire allo sviluppo dello studio sulla valutazione della vulnerabilità sismica degli aggregati di edi ci in muratura di pietra. È stata fatta una ricerca e una revisione sui più recenti metodi e strumenti utilizzati per la valutazione della vulnerabilità sismica di edi ci in muratura, con particolare attenzione per la ricerca sviluppata in Italia e in Portogallo. È stato presentato il modello equivalente di un caso di studio che ha coinvolto un edi cio aggregato situato a San Pio delle Camere (Abruzzo, Italia) paese colpito dal terremoto de l'Aquila nell'aprile del 2009. Per la redazione del modello è stato utilizzato il software di STA DATA 3muri®, dove sono stati discussi l'in uenza di alcuni parametri sulla costruzione del comportamento globale e delle corrispondenti pushover curve. Sono stati anche discussi i risultati ottenuti per le curve di fragilità e le distribuzioni di danni dovuti all' azione sismica considerata. In una seconda fase sono stati applicati e discusse metodologie sempli cate basate nella valutazione dell'indice di vulnerabilità. In ne è stato fatto il confronto tra metodologie per ulteriori sviluppi della ricerca.
Perrault, Matthieu. "Evaluation de la vulnérabilité sismique de bâtiments à partir de mesures in situ". Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00934454.
Texto completo da fonteLimoge, Claire. "Méthode de diagnostic à grande échelle de la vulnérabilité sismique des Monuments Historiques : Chapelles et églises baroques des hautes vallées de Savoie". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN014/document.
Texto completo da fonteThe aim of this thesis is to propose a seismic vulnerability assessment method well suited to the study of a complete historical heritage, regardless of the prestige of each building. Indeed the great seismic vulnerability of the historical heritage, often in masonry, requires to act preventively in order to avoid irreparable damage. Our approach must tackle three main requirements: to develop large-scale tools of choice to prioritize the needs, to provide relevant analysis of seismic behavior on the structural scale even in the first study, and to manage the large number of uncertainties characterizing the old buildings structural assessment. To this aim, we study the baroque churches and chapels in the high valleys of the French Savoie. They witness to a particularly prosperous period in the history of Savoy and a unique artistic movement adapted to a harsh environment. In this context we have therefore developed or adapted different tools in order to handle the peculiarities of the old buildings. This way we can use the today proposed techniques for modern buildings to study these ancient buildings in rustic masonry: non-linear temporal dynamics numerical modeling, vibratory in situ measurements, non-linear multi modal analysis
Mosleh, Araliya. "Seismic vulnerability assessment of existing concrete highway Iranian bridges". Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17173.
Texto completo da fonteSismos recentes mostram que as pontes são uma das infraestruturas mais vulneráveis dos sistemas de transporte rodoviário, e comprovam a necessidade de avaliação da vulnerabilidade deste tipo de estruturas, especialmente as projetadas segundo a filosofia patente nos códigos antigos. A avaliação da vulnerabilidade sísmica das pontes rodoviárias localizadas em áreas de elevada perigosidade sísmica e a estimativa do seu desempenho sísmico representam tarefas importantes para a segurança dos sistemas de transporte. Neste contexto, esta investigação tem como objetivo estudar a vulnerabilidade sísmica das pontes de betão armado existentes no Irão. O trabalho foca-se principalmente nas seguintes tarefas: desenvolvimento de análises estatísticas, classificação das pontes mais comuns no Irão, seleção da ação sísmica representativa, definição de estados de dano, estudo dos efeitos das práticas de construção e, finalmente, análise de curvas de fragilidade para avaliar a vulnerabilidade sísmica de pontes tipo representativas das obras existentes no Irão. O primeiro capítulo resume trabalhos no domínio da caracterização da sismicidade na área geográfica em estudo, em função das diferentes placas tectónicas e da distribuição das zonas de rotura prováveis, com base em informação recolhida em sismos passados e uma revisão geral dos estudos anteriores e a pesquisa bibliográfica, nomeadamente em termos de curvas de fragilidade para as pontes com base em diferentes abordagens. O Capítulo 2 descreve os tipos de ponte mais comuns existentes no Irão e classifica-as de acordo com as suas características estruturais primárias. Capítulo 3 explicar os modelos analíticos não lineares 3-D das estruturas de pontes amostra usando modelos analíticos detalhados para os seus componentes. O Capítulo 4 é dedicado à seleção de um conjunto de registos sísmicos reais que sejam representativos das diferentes fontes sísmicas. O Capítulo 5 é dedicado à definição de estados limite de dano. Neste capítulo, foi realizada uma revisão das propostas para a avaliação dos estados limite de dano disponíveis na literatura. Para isso, diferentes tipos de incertezas associadas a parâmetros que influenciam o comportamento das pontes foram consideradas, nomeadamente em termos de seção e altura dos pilares, presença da emenda da armadura longitudinal e vão. Além disso, a influência das propriedades dos materiais com base na resistência à compressão do betão e da resistência do aço são analisadas e os resultados são tratados em termos de curvas de fragilidade para cada classe de pontes considerada. O Capítulo 6 apresenta os principais resultados da análise sísmica tridimensional realizada sobre vários casos de estudo. Capítulos 7 indicam o estudo da resposta estocástica de pontes de betão considerando a incerteza na rigidez de rolamento e de encosto. Finalmente, no capítulo 8, as principais conclusões são tiradas a partir do trabalho desenvolvido no âmbito do presente estudo.
Past earthquakes occurred in seismically active areas around the world show that bridges are one of the most vulnerable components of the highway transportation systems, and evidence the need to study the vulnerability of bridges, especially the ones designed with the old codes. Thus, the seismic vulnerability assessment of the highway bridges located in high seismic hazard areas and the assessment of the bridges’ performance under seismic demands play an important role for the safety of transportation systems. In this context, this research aimed to study the seismic vulnerability of existing old concrete bridges in Iran. The research work was mainly focused on the following tasks: identification of the most common bridges in Iran, ground motion selection, damage state definition, real construction practices and finally the analysis of fragility curves to assess the seismic vulnerability of common bridges in Iran. The first chapter presents the study of seismicity in a geographical area of interest for this study, covered by different tectonic plates and distribution of probable rupture zones of past earthquakes and the general overview of previous studies and a literature survey developed to generate the bridge fragility curves based on different approaches. Chapter 2 describes the most common existing ordinary highway bridges and classifies them according to their primary structural characteristics. Chapter 3 explains the 3-D nonlinear analytical models of the sample bridge structures using detailed analytical models for its components. Chapter 4 is devoted to the procedure followed in the selection of earthquake ground motion records that are representative of the different seismic sources, based on ground motion intensity. Chapter 5 addresses aspects related with the definition of damage limit states. In this chapter, a review of the damage states definitions and strategies available in the literature is also made. For this, different types of bridges uncertainties, in terms of column height, superstructure type, lap splice and span length are investigated for the selected case studies. Also, the influence of material properties, namely the compressive strength of concrete and the yield strength of steel is described. In Chapter 6 the results are generated in terms of fragility curves for each bridges class. Chapter 7 indicates the study of the stochastic response of concrete bridges considering the uncertainty in the bearing and abutment stiffness. Finally in chapter 8, the main conclusions are drawn from the work developed within the present study.
Suescun, Juliana Ruiz. "Courbes de fragilité pour les ponts au Québec tenant compte du sol de fondation". Mémoire, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/1576.
Texto completo da fonteTavano, Matteo. "Seismic response of tank-fluid systems: state of the art review and dynamic buckling analysis of a steel tank with the added mass method". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3006/.
Texto completo da fonteZaghlool, Baher SalahElDeen Othman Ahmed. "Behaviour of three-dimensional concrete structures under concurrent orthogonal seismic excitations". Thesis, University of Canterbury. Civil Engineering, 2007. http://hdl.handle.net/10092/1177.
Texto completo da fonte伊藤, 義人, Yoshito Itoh, M. Wada e Chunlu Liu. "Lifecycle Environmental Impact and Cost Analyses of Steel Bridge Piers with Seismic Risk". 2005. http://hdl.handle.net/2237/5328.
Texto completo da fonteCiano, Matteo. "On the accuracy of seismic fragilities for actual linear/nonlinear structural systems: the modified intensity measure method". Doctoral thesis, 2021. http://hdl.handle.net/2158/1269611.
Texto completo da fonteLin, Jhong-You, e 林忠佑. "Fragility Curves of Corrosion Steel Cylindrical Tanksunder Seismic Loadings". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/22013267861076253059.
Texto completo da fonte國立金門大學
土木與工程管理學系碩士班
105
The objective of this research is to develop the corrosion cylindrical steel tanks subjected to seismic loading. The fluid-structure-soil interactions are incorporated in the dynamic analysis. The tanks are modeled as thin shells. The hydraulic loading includes impulsive mass and convective mass. The soil mediums are simulated three dimensional solid elements. The viscous transmitting boundary is attached to boundary to avoid seismic wave reflection. The nearfault seismic ground accelerations only consider the horizontal components. Chapter 1 is devoted to introduction, including motivation of this research, methodology, literature review of the previous studies, and the organization of this thesis. Chapter 2 addresses the description of cylindrical steel tanks with various ratios of heights and radii. In the chapter 3, the forty-six near-fault earthquake components with pulse-like velocities are served as horizontal input ground accelerations. Chapter 4 is concerned with modal analysis and dynamic analyses of steel tanks with different degree of corrosion. Based on results of chapter 4, the fragility curves of corrosion steel tanks subjected to near fault earthquakes are developed in chapter 5. The damage indexes based on the drift ratios use to classify the various damage states. The fragility curves of corrosion steel tanks are developed with this damage indexes, accordingly.Chapter 6 presents the conclusions and final remarks, the contribution and feature of this research as well as the future study. The results of this research can be implemented in the primary design of aged corrosion steel tanks.
CHOUDHURY, LALIT. "SEISMIC ANALYSIS AND DEVELOPMENT OF FRAGILTY CURVE FOR AN RCC FRAME". Thesis, 2017. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15961.
Texto completo da fonteLUSIANTO, LIAUW LUKMAN, e LIAUW LUKMAN LUSIANTO. "SEISMIC EVALUATION AND FRAGILITY CURVES OF EXISTING REINFORCED CONCRETE BRIDGES CONSIDERING CORROSION OF STEEL REINFORCEMENT". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/3r75p7.
Texto completo da fonte國立臺灣科技大學
營建工程系
100
A life-cycle seismic evaluation method of some existing reinforced concrete bridges considering the effects of corrosion of steel reinforcement is proposed in this thesis. The evaluation method is based on the well-known ATC-40 nonlinear static pushover analysis procedure and is implemented in common commercial software familiar to engineers. Chloride and carbonation attacks make a reinforced concrete structure prone to corrosion of steel reinforcement. The effects of steel corrosion are considered by modeling degradation of mechanical properties of steel reinforcement, softening of cover concrete in compression, and reduction of bond between concrete and steel reinforcement. Twenty four existing reinforced concrete bridges in Taiwan are analyzed using the proposed method. Fragility curves express the probabilities of exceeding damage limit stages, under various levels of seismic excitation. In order to know the probability of exceeding damage limit stages and relationship between corrosion level and capacity, the analytical fragility curves are developed by results of the nonlinear static pushover analysis procedure with respect to the Peak Ground Acceleration for seismic damage assessment of bridges. Evaluation of twenty four bridges in Taiwan shows that material degradation due to corrosion in bridges structure affect either the pushover analysis result of the bridges and PGA capacity of the bridges. From the service year and PGA reduction relationship shows that 1st Bridge has the quickest time (47 year) to get Ac X < design PGA. It is because 1st bridge has closer distance to the ocean (0.9 km). That’s why 1st bridge satisfies the performance in the initial condition but After 47 years of service, collapse PGA becomes not satisfying because of corrosion. The relationship also shows that 10th bridge has the highest reduction for PGA, 0.01g /10year. It’s because this bridge located in medium distance to the ocean (6.5 km), have thin cover depth and small diameter size of longitudinal bar. The closer distance to the ocean, thinner depth of cover concrete and smaller size of longitudinal bar will higher reduce the PGA value. Therefore reduction of PGA value depends on distance to the ocean, thin or thickness of cover concrete depth and diameter size of longitudinal reinforcement. Based on the seismic fragility curves, Normalized PGA vs Corrosion level shows that corrosion level 20% in longitudinal reinforcement is enough to get half capacity in x or y direction exceeding 50% damage. Thus it is very important to consider corrosion in reinforced concrete bridges.
Sivaramakrishnan, Balaji. "Non-linear modeling parameters for reinforced concrete columns subjected to seismic loads". Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-12-2635.
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O'Brien, William Charles Memari Ali M. "Development of a closed-form equation and fragility curves for performance-based seismic design of glass curtain wall and storefront systems". 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3872/index.html.
Texto completo da fonteMonchetti, Silvia. "On the role of uncertainties in the seismic risk assessment of historic masonry towers". Doctoral thesis, 2018. http://hdl.handle.net/2158/1130895.
Texto completo da fonteΣκαλωμένος, Κωνσταντίνος. "Seismic performance of plane moment resisting frames with concrete filled steel tube columns and steel I beams". Thesis, 2014. http://hdl.handle.net/10889/8442.
Texto completo da fonteΟ σκοπός της παρούσας έρευνας είναι να διερευνήσει τη σεισμική συμπεριφορά επίπεδων καμπτικών πλαισίων με υποστυλώματα από τετραγωνικές χαλύβδινες κοιλοδοκούς γεμισμένες με σκυρόδεμα και με μεταλλικές δοκούς τύπου Ι και να προτείνει μία μέθοδο αντισεισμικού σχεδιασμού με βάση την επιτελεστικότητα για αυτόν τον τύπο κατασκευών. Αρχικά, διεξάγεται μία υπολογιστική μελέτη ώστε να διερευνηθεί η μη-γραμμική ανελαστική απόκριση υπό ανακυκλιζόμενη φόρτιση και σταθερή θλίψη των τετραγωνικών σύμμικτων υποστυλωμάτων. Ένα ακριβές και προηγμένο μοντέλο πεπερασμένων στοιχείων δημιουργείται όπου η ακρίβεια των αποτελεσμάτων του ελέγχεται μέσω συγκρίσεων των αναλυτικών λύσεων με υπαρκτά πειραματικά δεδομένα. Κατόπιν, χρησιμοποιώντας αυτό το μοντέλο πεπερασμένων στοιχείων, πραγματοποιoύνται εκτενείς παραμετρικές μελέτες με σκοπό να παραχθούν πληροφορίες σχετικά με την υστερητική συμπεριφορά των σύμμικτων υποστυλωμάτων. Έτσι, στη βάση αυτής της υπολογιστικής μελέτης, τρία απλά και αρκετά ακριβή υστερητικά μοντέλα συγκεντρωμένης πλαστιμότητας αναπτύσσονται για την προσομοίωση της συμπεριφοράς σύμμικτων υποστυλωμάτων υπό ανακυκλιζόμενη φόρτιση και σταθερή θλίψη. Έπειτα, διερευνάται η σεισμική συμπεριφορά επίπεδων καμπτικών πλαισίων με σύμμικτα υποστυλώματα και με μεταλλικές δοκούς τύπου Ι. Πιο συγκεκριμένα εξετάζεται η επίδραση της λεπτομερής μοντελοποίησης των επιμέρους δομικών στοιχείων μια κατασκευής, όπως των σύμμικτων υποστυλωμάτων, των μεταλλικών δοκών, των κόμβων διατμητικής παραμόρφωσης και των συνδέσεων, στη σεισμική συμπεριφορά των πλαισίων μέσω συγκρίσεων με υπαρκτά πειραματικά δεδομένα. Επιπλέον, διαμορφώνονται καμπύλες τρωτότητας για τρία σύμμικτα πλαίσια σχεδιασμένα με τους Ευρωπαϊκούς κανονισμούς για διάφορα επίπεδα μοντελοποίησης χρησιμοποιώντας μη-γραμμικές αναλύσεις χρονοιστορίας. Στη βάση αυτών των καμπυλών τρωτότητας, κάποιος μπορεί να επιλέξει το κατάλληλο επίπεδο πολυπλοκότητας της μοντελοποίησης των σύμμικτων πλαισίων ώστε να οδηγηθεί στην επιθυμητή συμπεριφορά για μια δεδομένη σεισμική ένταση. Το τρίτο μέρος της παρούσας έρευνας πραγματεύεται την ανάπτυξη της διαδικασίας που απαιτείται από την Υβριδική Δυνάμεων-Μετατοπίσεων (ΥΔΜ) μέθοδο αντισεισμικού σχεδιασμού με βάση την επιτελεστικότητα, η οποία συνδυάζει τα πλεονεκτήματα της μεθόδου των δυνάμεων και της μεθόδου των μετακινήσεων, ώστε να εφαρμόζεται για τον αντισεισμικό σχεδιασμό σύμμικτων καμπτικών πλαισίων. Έτσι, πραγματοποιούνται εκτενείς παραμετρικές μελέτες περιλαμβάνοντας μη-γραμμικές δυναμικές αναλύσεις σε 96 πλαίσια υπό 100 σεισμικές καταγραφές με σκοπό τη δημιουργία τράπεζας δεδομένων με αποκρίσεις ενδιαφέροντος. Κατόπιν αναλύσεων γραμμικής παλινδρόμησης, απλές σχέσεις προτείνονται που απαιτούνται από την ΥΔΜ μέθοδο οι οποίες συνδέουν τη μέγιστη μετακίνησης κορυφής των πλαισίων με τη στοχευόμενη μέγιστη γωνιακή παραμόρφωσης των ορόφων ή την τοπική στροφική πλαστιμότητα των μελών και την απαιτούμενη συνολική πλαστιμότητας του πλαισίου με τον συντελεστή συμπεριφοράς q. Η σύγκριση της προτεινόμενης ΥΔΜ μεθόδου αντισεισμικού σχεδιασμού με εκείνης που προτείνεται από τον Ευρωπαϊκό κανονισμό αποδεικνύει ότι η προτεινόμενη διαδικασία φαίνεται να είναι πιο ακριβής και ελέγχει καλύτερα τις παραμορφώσεις. Μη-γραμμικές αναλύσεις χρονοιστορίας δείχνουν την συνέπεια της ΥΔΜ να εκτιμά με ακρίβεια τις απαιτήσεις των ανελαστικών παραμορφώσεων στα διάφορα επίπεδα επιτελεστικότητας σε αντίθεση με την τάση του κανονισμού να υποεκτιμά τη μέγιστη γωνιακή μετακίνησης ορόφων και να υπερεκτιμά την μέγιστη μετακίνηση κορυφής. Τέλος, συγκρίσεις σύμμικτων πλαισίων με σχεδιασμένα πλαίσια εξ’ ολοκλήρου από χάλυβα σύμφωνα με την ΥΔΜ, δείχνουν ότι τα σύμμικτα πλαίσια έχουν καλύτερη σεισμική συμπεριφορά από τα μεταλλικά και φαίνεται να είναι πιο οικονομικές κατασκευές.
Ασκούνη, Παρασκευή. "Καμπύλες σεισμικής τρωτότητας γεφυρών οπλισμένου σκυροδέματος". Thesis, 2012. http://hdl.handle.net/10889/5664.
Texto completo da fonteThis study presents first a literature review of existing fragility functions for bridges and then new fragility curves that were produced for European road and railway RC bridges. Regular bridges with continuous deck, connected to the piers either monolithically or through elastomeric bearings, were studied. Other variable parameters were: bridge length, pier height and cross-section, number of columns per pier and level of seismic design. Each bridge was designed, dimensioned and detailed according to Eurocode 2 and, for bridges with seismic design, according to Eurocode 8. Linear elastic analysis was subsequently performed according to Part 3 of Eurocode 8 to estimate the seismic demand. Fragility functions were then constructed accounting for the model uncertainty for demand and capacity, the dispersion of material and geometric properties and the uncertainty of spectral values.