Дисертації з теми "Existing Reinforced Concrete"
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Paschalis, Spyridon A. "Strengthening of existing reinforced concrete structures using ultra high performance fiber reinforced concrete." Thesis, University of Brighton, 2017. https://research.brighton.ac.uk/en/studentTheses/c07ce9c7-5880-4108-a0f2-68bf6ea50dd5.
Повний текст джерелаOliveira, João Mário Dias de. "Seismic assessment of existing reinforced concrete buildings." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11661.
Повний текст джерелаThis dissertation aims to the discussion and application of tools and processes which allows to assess the non-linear behaviour of a reinforced concrete structure. When a numerous amount of buildings was built in concrete, in a period when the regulations did not have the design philosophy for the occurrence of earthquakes, it is important to carry out full and e ective structural assessments. Among several possibilities to make the evaluation as, simpli ed, linear analysis and static non-linear analysis, the non-linear dynamic can provide the most approximate numerical behaviour compared to the real one. With the potentialities of the computers, it is possible to run the analysis with this complex simulation using dynamic excitations of real earthquakes. It is made a historical reference of numerical models which simulates the behaviour of materials, and the ones integrated on the analysis are further explored. Is presented the study cases, its assumptions and some procedures that should be applied in structural modelling. The discussion is divided in two groups. On the rst the global analysis is discussed in terms of global behaviour, deformations and progression of forces, and on the second group is referred to the local assessment of structural elements. The local analysis has some comparisons between di erent interpretations of the code and also regarding the Italian code. Is analysed the bond-slip mechanism due to the smooth bars in some elements, which better simulates the global response of the structures.
A presente dissertação visa a discussão e aplicação de ferramentas e processos de veri cação que permitam analisar o comportamento não linear de estruturas em betão armado. Existem actualmente inúmeros edifícios em betão armado, construídos num período em que os regulamentos não previam a ocorrência de sismos, é importante proceder a avaliações estruturais completas e e cazes. Entre várias possibilidades para fazer a avaliação, como simpli cadas, aná- lises lineares, análises estátiocas não-lineares, é a análise dinâmica não-linear que mais aproxima o comportamento numérico ao real. Com as potencialidades numéricas permitidas pelos computadores, é possível prever esse complexo comportamento onde podem ser simuladas excitações dinâmicas de sismos reais. É feita uma referência histórica de modelos numéricos que simulam o comportamento dos materiais, aprofundando os que são integrados na análise. São apresentados os casos de estudo, os pressupostos e alguns procedimentos que devem ser aplicados na modelação estrutural. A discussão dos resultados é separada em dois grupos. No primeiro é feita uma análise global onde se discute o comportamento global, deformações e progressão de forças, e no segundo uma análise local dos elementos estruturais. A análise local é acompanhada de algumas comparações entre diferentes interpretações do código europeu e entre o código italiano. São analisados alguns elementos em relação ao deslize da armadura lisa, representando melhor a resposta das estruturas.
BOY, SERPIL. "RETROFIT OF EXISTING REINFORCED CONCRETE BRIDGES WITH FIBER REINFORCED POLYMER COMPOSITES." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1078508332.
Повний текст джерелаYoussef, Maged Ali. "Modeling of existing and rehabilitated reinforced concrete buildings." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0035/NQ66299.pdf.
Повний текст джерелаBiddah, Ashraf Mahmoud Samy. "Seismic behaviour of existing and rehabilitated reinforced concrete frame connections." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ30074.pdf.
Повний текст джерелаYalcin, Cem. "Seismic evaluation and retrofit of existing reinforced concrete bridge columns." Thesis, University of Ottawa (Canada), 1998. http://hdl.handle.net/10393/8902.
Повний текст джерелаBayani, Keivani Shahram. "Seismic evaluation of existing reinforced concrete bridges in Ottawa region." Thesis, University of Ottawa (Canada), 2003. http://hdl.handle.net/10393/26357.
Повний текст джерелаYalçin, Cem. "Seismic evaluation and retrofit of existing reinforced concrete bridge columns." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0020/NQ46554.pdf.
Повний текст джерелаLu, Ruodan. "Automated generation of geometric digital twins of existing reinforced concrete bridges." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289430.
Повний текст джерелаMorbin, Riccardo. "Strategies for Seismic Assessment of Common Existing Reinforced Concrete Bridges Typologies." Doctoral thesis, Università degli studi di Trento, 2013. https://hdl.handle.net/11572/368824.
Повний текст джерелаMorbin, Riccardo. "Strategies for Seismic Assessment of Common Existing Reinforced Concrete Bridges Typologies." Doctoral thesis, University of Trento, 2013. http://eprints-phd.biblio.unitn.it/932/1/tesi_PhD_Morbin_2013.pdf.
Повний текст джерелаMola, Elena. "Criteria for the seismic vulnerability reduction of existing irregular reinforced concrete structures." Grenoble INPG, 2007. http://www.theses.fr/2007INPG0019.
Повний текст джерелаThe research is a contribution to the development of tools and criteria for the seismic assessment and retrofitting of existing reinforced concrete structures, in particular plan-wise irregular ones. Ln fact, the 'capacity design' method, based on the rationale of the equal displacernent rule and the central role of ductility, and usually employed for the design of new structures, does not automatically extend to existing irregular structures. The work is thoroughly based on a large scale experimental activity carried out in the framework of the EC-funded project SPEAR (Seismic Performance Assessment and Rehabilitation) and consisting of a series of pseudodynamic tests on a full-size plan-wise irregular three storey frame structure, bath in the as-built and in two different retrofitted configurations. Based on the experimental data, the research attempted at first at clarifying the basic features of the seismic response of such structures ; following to that, the proposed criteria for the reduction of their seismic vulnerability and for the design of effective rehabilitation interventions were presented. To this end, the experimental approach was complemented by the numerical one, with the creation of a numerical model into a finite element structural analysis software and the application of the Karhunen-Loeve nonlinear modal analysis method
Magnanini, Nicola. "Seismic retrofit of a reinforced concrete building placed in L'Aquila." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/4778/.
Повний текст джерелаValentini, Giacomo. "Seismic vulnerability assessment and retrofit using BRB of an existing reinforced concrete building." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Знайти повний текст джерелаBayraktar, Atilla. "Detailed Evaluation Of An Existing Reinforced Concrete Building Damaged Under Its Own Weight." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613230/index.pdf.
Повний текст джерелаs building inventory consists of reinforced concrete frame structures. In addition to that a big part of the existing building inventory in Turkey shows insufficiency in seismic performance damage or failure of structures under their own loads has also been observed. The failure of Zü
mrü
t Apartment building that occurred in 2004 in Konya and resulted in the death of 92 people brings the necessity of researches on robustness and reserve capacities of the buildings under gravity loading to front. In the context of this thesis, the event in Konya that has resulted in the crushing of four columns in Dostlar Building Complex is studied. After the occurrence of the event, the building was visited, plans of existing condition were prepared and pre-assessment was performed. Original plans of the building, strength test results of the concrete samples and reinforcement detection results were obtained. The reasons behind the crushing of the columns have been investigated through a series of analyses based on a number of possible hypotheses. After modeling the building in SAP2000 program, demand-capacity ratios are calculated. Nonlinear behavior of the structure is determined by incremental static pushover analysis and the seismic performance of the building is evaluated by nonlinear procedure described in 2007 Turkish Earthquake Code. To determine the nonlinear behavior under gravity loading and collapse mechanism, incremental vertical pushover analysis is performed.
Carriere, Jean-Michel. "Seismic retrofit of existing reinforced concrete moment resisting frame structures using diagonal prestressing." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27449.
Повний текст джерелаCavallari, Giulia. "Pushover analysis of an existing reinforced concrete bridge:Jamboree Road Overcrossing in Irvine, California." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3300/.
Повний текст джерелаBoylu, Mert Aktaş Engin. "A Benefit/Cost Analysis For The Seismic Rehabilitation On Existing Reinforced Concrete Buildings in İzmir/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/yapimekanigi/T000333.pdf.
Повний текст джерелаKeywords: Benefit-cost analysis, seismicity, seismic safety, rehabilitation, damage estimation. Includes bibliographical references (leaves.81-83).
De, Jager Charl. "A critical appraisal of existing models for nonlinear finite element analysis of reinforced concrete response." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20052.
Повний текст джерелаENGLISH ABSTRACT: This study entails the appraisal of the constitutive models available for the non linear finite element analysis of reinforced concrete, using the DIANA finite element package and following generally accepted guidelines for non linear finite element analyses. The constitutive models considered are plasticity and total strain based (fixed and rotating crack) models. The appraisal consists of the analysis of various experiments performed on reinforced concrete beams that are governed by compressive, shear and tensile dominated failures. The investigation is not limited to the accuracy of the results obtained using these models but also of the consistency of the results obtained with regard to various mesh types and sizes, as well as a study of the individual influence of several material parameters. The intention of the study was to provide the reader with an indication of the performance capacity (accuracy and consistency) of the available constitutive models, where the notion of the use of the results obtained from non linear finite element analyses for design purposes is considered. The results obtained were varied. The models performed reasonably well in the compressive and tension dominated studies, with the importance of accurate material parameters being emphasized especially for the more advanced cementitious materials investigated. The total strain rotating crack model also showed a proclivity of simulating incorrect failure modes as well as exhibiting reluctance towards stress redistribution. All models used for the shear dominated study yielded mostly inaccurate and inconsistent results, but it was found that the four node quadrilateral element with selective reduced integration performed the best. The plasticity model did not capture shear failure well, and convergence was often not attained. The constant shear retention factor of the total strain fixed crack model was found to yield more detailed response curves for the smaller mesh sizes. The results of the tension dominated beams inspired more confidence in the models as quite accurate values were attained, especially by the plasticity model used. The ability of the available models to simulate realistic structural behaviour under various failure modes is very limited, as is evident from the results obtained. The development of a more advanced and robust model is required, which can provide consistently accurate results and failure modes, and even ‘anticipate’ potential failure modes not considered by the user.
Zimos, D. K. "Modelling the post-peak response of existing reinforced concrete frame structures subjected to seismic loading." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/18531/.
Повний текст джерелаSmiroldo, Francesco. "Increasing the seismic resilience of existing reinforced concrete framed structures by using timber-based panels." Doctoral thesis, Università degli studi di Trento, 2022. https://hdl.handle.net/11572/355186.
Повний текст джерелаDuzce, Zeynep. "Performance Evaluation Of Existing Medium Rise Reinforced Concrete Buildings According To 2006 Turkish Seismic Rehabilitation Code." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607834/index.pdf.
Повний текст джерелаnon-linear analysis (pushover analysis with equivalent lateral load method and mode superposition method) and non-linear time history analysis. In this study, linear elastic analysis with equivalent lateral loads and non-linear static analysis (pushover analysis) with equivalent lateral loads are investigated comparatively. SAP2000 software is used for pushover analysis
however the plastic rotation values obtained from SAP2000 are not used directly but defined according to the code procedures. Post-elastic rotations at yielding sections are transferred to Excel and the corresponding strains are calculated from these rotations by Excel Macro. These strains are compared with strain limits described in the 2006 Turkish Seismic Rehabilitation Code to obtain the member performances. In the linear elastic procedure, structural analysis is performed also by SAP2000 to obtain the demand values, whereas the capacity values are calculated by another Excel Macro. With these demand and capacity values, corresponding demand to capacity ratios are calculated and compared with demand to capacity ratio limits described in 2006 Turkish Seismic Rehabilitation Code to obtain the member performances. Global performances of the buildings are estimated from the member performances and from the inter-storey drifts for both two methods. The results are compared to each other, and critically evaluated.
Dogan, Onur. "Multistage Seismic Assessment Methods For Existing Reinforced Concrete Buildings And Their Applicability For Retrofitting Cost Estimation." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615470/index.pdf.
Повний текст джерелаsafe&rdquo
or &ldquo
unsafe&rdquo
according to the current Turkish Seismic Code. The classification procedure is based on discriminant analysis. The cross-sectional area of the load-bearing members of a building and its preliminary assessment score are selected as the discriminator variables. The second and ultimate basic goal of the study is to propose a method through which the minimum retrofitting cost for satisfying the provisions of the Turkish Seismic Code can be estimated. A quick and uncostly assessment of retrofitting cost estimates based on the procedure described in this thesis will provide a useful input for decisions concerning whether a seismically &ldquo
unsafe&rdquo
building should be rebuilt or retrofitted. Such a situation will save time, labor and money, when it is used for the evaluation of building stocks involving large number of buildings and also in urban transformation operations.
Liel, Abbie B. "Assessing the collapse risk of California's existing reinforced concrete frame structures : metrics for seismic safety decisions /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаWang, Naiyu. "Reliability-based condition assessment of existing highway bridges." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34835.
Повний текст джерелаSentosa, Bastian Okto Bangkit. "Assessing the structural elements of reinforced concrete buildings by using dynamic measurements." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAA008/document.
Повний текст джерелаThere are many of the examples of dynamics measurements applications in the existing building: verification of structural seismic vulnerability, which was constructed before the earthquake building code; auscultation of structural capacity in post-earthquake situation or after modification in surround environment (Excavation of tunnel or demolition the neighbour buildings for example). Currently, this measurement type enables the diagnosis a structure in global scale (a whole structure) while identification and localization of damage in local scale (each elements of the structure) remains to be explored. In this dissertation, diagnosis in locale scale will be studied. This study is significant for its contribution to the national reassessment of existing structures where there is the large number of buildings to be rehabilitated
Ozturk, Ismail. "A Comparative Assessment Of An Existing Reinforced Concrete Building By Using Different Seismic Rehabilitation Codes And Procedures." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608036/index.pdf.
Повний текст джерелаAl-Majidi, Mohammed Kadhim Haloob. "Development of Fibre Reinforced Geopolymer Concrete (FRGC) cured under ambient temperature for strengthening and repair of existing structures." Thesis, University of Brighton, 2017. https://research.brighton.ac.uk/en/studentTheses/13f703df-e33a-42d7-ad73-8511390fd582.
Повний текст джерелаGunel, Orhun Ahmet. "Influence Of The Shear Wall Area To Floor Area Ratio On The Seismic Performance Of Existing Reinforced Concrete Buildings." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615678/index.pdf.
Повний текст джерелаBagge, Niklas. "Structural assessment procedures for existing concrete bridges : Experiences from failure tests of the Kiruna Bridge." Doctoral thesis, Luleå tekniska universitet, Byggkonstruktion och brand, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63000.
Повний текст джерелаLabò, Simone. "Holistic sustainable renovation of Post-World War II reinforced concrete building under a life cycle perspective by means diagrid exoskeletons." Doctoral thesis, Università degli studi di Bergamo, 2019. http://hdl.handle.net/10446/128920.
Повний текст джерелаMANCINELLI, OSCAR. "Safety and sustainability of school buildings." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2972448.
Повний текст джерелаKirschbaum, Adam. "Hodnocení konstrukcí průmyslových objektů podle ČSN ISO 13822." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240048.
Повний текст джерелаHolbová, Monika. "Diagnostika železobetonové konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265583.
Повний текст джерелаCassese, Paolino. "Seismic performance of existing hollow reinforced concrete bridge columns." Tesi di dottorato, 2017. http://www.fedoa.unina.it/11503/1/Cassese_Paolino_29.pdf.
Повний текст джерелаChang, Han-Tung, and 張翰東. "Durability and Service Life Prediction of Existing Reinforced Concrete Bridges." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/45143460529925178186.
Повний текст джерела國立臺灣海洋大學
河海工程學系
96
Both the durability problem and service life prediction of reinforced concrete(RC) structures are very important in civil engineering all over the world. The corrosion of RC structures due to chloride ion penetration into concrete is occurred damage in long-term and load-bearing-capacity is not strengthened enough. The main propose of this article is to analyze rust-expansion-cracking life-time and load-bearing-capacity life-time after the corrosion of steel in concrete. The service life of RC structures can be divided into three stages, carbonation or initiation period , depassivation period and corrosion or propagation period . The theoretical models of rust-expansion-cracking and load-bearing-capacity are used to predict the service-life of RC structures by using probability and reliability index. To verify the serviceability of theoretical models, the data of field test of the Shi-yuan viaduct, Wann-fwu bridge, Chorng-ching viaduct were used as illustrative examples. When the reliability index is 1.0, their rust-expansion-cracking life-time and load-bearing-capacity life-time are 58, 33, and 57 years and 78, 147, and 116 years, respectively. The results of this study may be applied to predicting the service life, repair, strengthening, and demolition of RC bridges or structures.
YANG, SHANG-HENG, and 楊尚衡. "Experimental study on strengthening existing reinforced concrete short columns of buildings." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/77062320528490667724.
Повний текст джерелаMORBIN, RICCARDO. "Strategies for seismic assessment of common existing reinforced concrete bridges typologies." Doctoral thesis, 2013. http://hdl.handle.net/11577/2748884.
Повний текст джерелаSu, Mor-Yuarn, and 蘇模原. "Enhancement of Shear Strength and Flexural Ductility of Existing Reinforced Concrete Beams." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/80999231734568710516.
Повний текст джерела國立臺灣科技大學
營建工程系
87
In this study, two U-shaped steel plate systems were used to enhance the shear strength and flexural ductility of existing reinforced concrete beams. A total number of 12 full-scale cantilever beams were tested under cyclic loading to study the effectiveness of the U-shaped steel plate systems. It is found that: (1) S1 U-shaped steel plate system was able to increase the shear strength and flexural ductility of the existing beams; (2) S2 U-shaped steel plate system was also able to enhance the shear strength and flexural ductility of the existing beams, but was not as effective as S1; (3) thicker steel plate was more effective. A brief method for evaluation of shear strength and flexural ductility of existing beads was proposed, and a design guide-line for U-shaped steel plate system was also suggested.
Liao, YenSheng, and 廖晏聖. "Carbonation Damage Evaluation and Service Life Prediction of Existing Reinforced Concrete Bridges." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/74982955694547388879.
Повний текст джерела國立海洋大學
河海工程學系
87
The first purpose of this paper is to study the durability evaluation of concrete bridges due to carbonation damage. The method of linearly unbiased estimation associated with the JC method developed by the Joint Committee on Structural Safety is adopted to predict the mean value and standard deviation of normal distribution for the carbonation depths of concrete bridges. The reliability index and failure probability of concrete bridges are also evaluated. Since the method of linearly unbiased estimation is very suitable for the small specimen obtained from practical engineering problem, the unknown parameters can be conveniently and actually determined. In order to verify this proposed theory, ten concrete bridges in the Taipei city are individually used to predict the mean value, standard deviation, reliability index and failure probability. In this paper, the results of present investigation indicate that both the Beei-men viaduct(Reliability index =0.23) and the Jzyh-chyang bridge(Reliability index =0.39) are necessary to do a larger repair. Both the Ay-gwo west road viaduct(Reliability index =0.92) and the Shi-yuan bridge(Reliability index =0.88) are just needed to do a small repair. The other bridges(Reliability index =1~2.0) can be safely serviceable. The carbonation depth of concrete is an important index for evaluating the damage and durability of reinforced concrete structures. In this paper, the second purpose focuses on the study of carbonation problems of concrete structures at existing cracks. The carbonation process of concrete structures at cracks consists of four steps: diffusion of into the crack, diffusion of into the concrete, chemical reaction, and diffusion of hydroxylions. The present study indicates that, as regards the pure process of carbonation, the same basic interrelations given for uncracked concrete are valid for carbonation in the crack regions as well. Carbonation can penetrate into the interior of cracked concrete much faster than it does through uncracked concrete. Under the static loading of the existing reinforced concrete structures with cracks, the carbonation depth at constant crack width can be predicted by using statistical methods.
Pan, Kuan-Yu, and 潘冠宇. "Seismic Retrofit of Existing Reinforced Concrete Frames Using Buckling-Restrained Braced Frames." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/67435522159198035390.
Повний текст джерела國立臺灣大學
土木工程學研究所
102
With the advancement in earthquake engineering technology and seismic provisions, many existing old reinforced concrete (RC) structures do not meet the current seismic standards. Seismic retrofit using steel braced frames has been found as a popular method to improve the seismic performance of RC buildings. For this purpose, closely-spaced post-installed anchors are widely adopted in the interface between the RC and steel frames to transfer the seismic loads. It often requires a substantial amount of on-site work of hole drilling and installation of anchors on the RC members. In this research, three identical strong-beam-weak-column RC frames are retrofitted, each with or without a diagonal buckling-restrained brace (BRB) incorporated into a steel braced frame using WT sections on four sides. Instead of applying the post-installed anchors to transfer the seismic loads, high-strength mortar bearing blocks at the four corners of the RC frame are constructed. The loads in the steel frame are transferred to the RC frame through the bearing blocks. This approach can reduce the usage of large amount of post-installed anchors. The purpose of this research is to evaluate the performance of the retrofitted frame, and investigate the load transfer mechanism between the RC frame and the steel frame. In this study, cyclic loading tests were applied on two RC frames retrofitted with steel braced frames using BRBs (BRB-S-WTF and BRB-D-WTF), and on one RC frame retrofitted with the steel frame without the brace. Test results show that, the lateral strength of BRB-D-WTF continued to increase until reaching 3% drift ratio, and developed 1060kN story shear (3 times of the bare RC frame) before the BRB core fractured at the 5% drift ratio. When the brace is in compression, it imposes a compressive force near the tip of the frame corner. This compressive force may cause an RC joint failure or a corbel-type failure in the RC column. In this research, these two failure modes are evaluated using the softened strut-and-tie model. The strength of the compressive strut in the beam-to-column joint is 810kN. In the BRB-S-WTF specimen, the estimated maximum brace compressive force is 1025kN. Thus, the beam-to-column joint failure was predicted. In the BRB-D-WTF specimen, the estimated maximum brace compressive force is 807kN. Thus, no beam-to-column joint failure was anticipated. The predictions match the test results. The concrete compressive strength of the RC column is 25MPa. In the BRB-S-WTF specimen, the strength demand on the corbel computed using the softened strut-and-tie model is 25.1MPa and approximately equals 25MPa. Thus, it predicted that the corbel failure might occur. In the BRB-D-WTF specimen, the strength demand on the corbel is 19.5MPa and less than 25MPa. The model predicted that the corbel failure should not occur. These two predictions also match the test results. Therefore, it appears that the softened strut-and-tie model is effective in predicting the joint failure and corbel failure of the RC frame. In this research, a simplified method for estimating the lateral strength of the retrofitted structure and the internal forces of RC beams and columns is developed from observing the load transfer mechanism found in the Abaqus finite element model (FEM) analysis results. The estimated lateral strengths for the BRB-S-WTF and BRB-D-WTF specimens are 1120kN and 973kN, predicted the experimental results of 1289kN and 1018kN, respectively. This confirms that the proposed simplified method is effective for estimation of the lateral strength of the retrofitted frame, and computing the estimated internal force demands on RC frame members. This study proposes a design procedure for retrofitting existing RC frames with buckling-restrained braced frames.
郭峻輔. "Studies of the Carbonation Service Life Prediction of Existing Reinforced Concrete Bridges." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/66709055285242002690.
Повний текст джерела國立臺灣海洋大學
河海工程學系
97
The carbonation problem due to the carbon dioxide in atmosphere penetrated into concrete through pore void is one of important factors of corrosion of existing reinforced concrete (RC) structures. Aside from material factor, both temperature and relative humidity (RH) are the principal environment factors which influence the carbonation problem of existing RC structures. When RH are larger or less than 70%, the carbonation zone in concrete can be divided into carbonated and noncarbonated zones or carbonated, partially carbonated and noncarbonated zones, respectively. The main aim of this article is to predict the carbonation life of existing RC bridges. The investigated methods are used to find the analytical solutions of one-dimensional linear (diffusivity D = constant) and nonlinear (D ≠ constant) diffusion and diffusion-chemical reaction equations associated with initial and boundary conditions, respectively. The carbonation life can be calculated from the analytical solutions through the Mathematica software. These theoretical models are applied to predicting the carbonation life of existing Dah-du and Dah-jin RC bridges in Taiwan. The results of present studies show that the one-dimensional nonlinear diffusion equation is suitable for bridges under RH>70% condition whereas the one-dimensional linear diffusion-chemical reaction equation is suitable for bridges under RH≦70%. The studied results may be offered as a crucial reference for engineering decision making for repair, strengthening or demolition of existing RC bridges.
YEN, WEI-LI, and 顏瑋利. "Research on Seismic Retrofitting for Existing Buildings with Exterior Reinforced Concrete Frames." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/m7ag8d.
Повний текст джерела國立臺北科技大學
土木工程系土木與防災碩士班
106
This research is for existing reinforced concrete structures and uses the external reinforced concrete frames method to retrofit. Study on traditional reinforced concrete retrofit methods (Column-Jacketing, shear walls and etc.). Those that traditional methods usually affect existing building. Take some cases for example-internal structures interior spaces are changed, people can’t stay in buildings, and existing walls, windows and doors may need to reinstalled. Those reasons mentioned above restrict promotion of retrofits on buildings. The research on RC existing structures with RC external retrofit frames is taken at NCREE. The research includes experiments and structural analysis. Three specimen are tested with reversed cyclic loading to compare the behaviors between an existing and and two retrofitted frames. The results show that external retrofit frames are effective to increase the lateral strength. Anchors of the interfaces between and there is no separation between existing and external frames. The analytical to model research is based on the experimented test results with ETABS external retrofit frames on experimental specimen and retrofit examples. The results show that the analytical results are more conservative than the experimental results on the external frames and external retrofit frames are also effective to increase the PGA of the retrofit examples.
Orton, Sarah Lynn 1978. "Development of a CFRP system to provide continuity in existing reinforced concrete buildings vulnerable to progressive collapse." Thesis, 2007. http://hdl.handle.net/2152/3241.
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(9873083), Robert Richard Jacobs. "Experimental Evaluation of Flexural Strengthening Methods for Existing Reinforced Concrete Members Using Fiber Reinforced Polymer (FRP) Systems." Thesis, 2020.
Знайти повний текст джерелаHuang, De-Zhi, and 黃德治. "Analysis and simulation of push over test for an existing Reinforced Concrete Building." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/90288428673223946892.
Повний текст джерела中原大學
土木工程研究所
95
Analysis of the seismic assessment for the building result that relates to plastic hinge property for every member. But the plastic hinge property with studied the theory in the past, no studies have compared to existing building test data. So since the 94th year of the Republic of China, the National Center for Research on Earthguake Engineering carry out a series of static push over tests for existing building, in order to get result of the correspond to earthquake damage of reality. This text use of various kinds of theories, calculate the intensity and plastic hinge property of the beam, colum and brick wall. And used to analysis of nolinear static push over in SAP2000 to simulation of the behavior and way of destroying in earthquake of the building. Then compare with results of the push over test for existing building in order to look for a good simulation method.
Chu, Ting-Pang, and 朱定邦. "Applications of Fuzzy Theory to Determine Repair Rankings for Existing Reinforced Concrete Bridges." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/13809522840268264151.
Повний текст джерела國立臺灣海洋大學
河海工程學系
92
Abstract In this article, the principal propose was applying the concept of fuzzy mathematics to determining the repair ranking for existing reinforced concrete (RC) bridges. Firstly, both the comparison matrix method and the D.(degree) E.(extent) R.(relevancy) evaluation method were provided for finding the weighting value and ranking of damage evaluation for ten existing RC bridges in Keelung, Taiwan. The evaluated repair ranking result obtained from the proposed method is: Fuh-min, Guan-in, Wuu-der, Jong-san, Jong-jeng, Shang-ren, Long-men, Jong-her bridges. Secondly, we proposed the multi-pole fuzzy pattern recognition evaluation method to find the optimal relative membership grade of an evaluated bridge attributed to any grade. Five existing RC bridges in Taiwan are adopted as an illustrative example. The repair ranking is the Tou-chyan-shi, Dah-jin, Lin-bian, Jong-jang and Shuang-yuan bridges. The predicted result is compared with the result obtained by the D.E.R. evaluation method. Finally, we proposed the fuzzy synthetic evaluation method, which is used the analytic hierarchy process for determining a factor weight vector, to assess the repair ranking of existing RC bridges. The predicted result is compared with the result obtained by the wide bound method. The predicated results obtained from both the proposed and wide bound methods had the same repair ranking. The present study results indicate that the proposed methods based on the fuzzy mathematics are reasonable, feasible and reliable. The results presented in this research work can be used as a crucial reference of engineering decision making for repair, strengthening or demolition for existing RC bridges.
Dumaru, Rakesh. "Seismic Performance Assessment and Strengthening Techniques for Existing Reinforced Concrete Buildings in Nepal." Doctoral thesis, 2018. https://repositorio-aberto.up.pt/handle/10216/116401.
Повний текст джерелаDumaru, Rakesh. "Seismic Performance Assessment and Strengthening Techniques for Existing Reinforced Concrete Buildings in Nepal." Tese, 2018. https://repositorio-aberto.up.pt/handle/10216/116401.
Повний текст джерелаKim, InSung. "Use of CFRP to provide continuity in existing reinforced concrete members subjected to extreme loads." 2008. http://hdl.handle.net/2152/17915.
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