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Behavior and modeling of reinforced concrete slab-column connectionsTian, Ying, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.
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Testing and evaluation of flexural reinforcing bar anchorages terminating in columns /Koester, Carl C. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 69-79). Also available on the World Wide Web.
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Physical models in fire study of concrete structuresNg, Ah Book January 1988 (has links)
No description available.
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Seismic retrofitting of rectangular reinforced concrete columns with partial interaction platingWu, Y. F. (Yu-Fei) January 2002 (has links) (PDF)
"June 2002" Includes bibliographical references (leaves 349-374)
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Seismic retrofitting of rectangular reinforced concrete columns with partial interaction plating / by Yu-Fei Wu.Wu, Y. F. (Yu-Fei) January 2002 (has links)
"June 2002" / Includes bibliographical references (leaves 349-374) / xxxix, 416 leaves : ill., plates ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Civil and Environmental Engineering, 2002
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Use of CFRP to provide continuity in existing reinforced concrete members subjected to extreme loadsKim, InSung 18 September 2012 (has links)
A special problem in many reinforced concrete structures built in the 1970s and earlier is the lack of continuity between elements. Continuity is a characteristic of structures essential to preventing collapse. Therefore, in extreme loading conditions such as loss of a column support due to terrorist attack or if earthquake or other extreme actions occur, the structures could be vulnerable to collapse. The study reported here focused on two structural discontinuities in existing reinforced concrete structures, discontinuity in bottom reinforcement in beams (horizontal discontinuity) and poorly detailed lap splices in columns (vertical discontinuity). The objective of this study was to develop rehabilitation methods using CFRP to provide continuity of reinforcement in existing structures. To develop the rehabilitation methods, two separate experimental studies were conducted using beam and column specimens. CFRP materials were applied to the bottom or side face of a beam and anchored using CFRP anchors or U-wraps to provide horizontal continuity in bottom reinforcement and tested under dynamic loading. After CFRP rehabilitation, the ductility of the bottom reinforcement and large rotational capacity of the beam were realized. CFRP materials were also applied to the lap splice region in square and rectangular columns which exhibited a brittle splice failure as-built. After rehabilitating the columns using CFRP jackets and anchors, the failure mode changed from a brittle splice failure to yield of column reinforcement, and the strength and deformation capacity were improved under both monotonic and cyclic loading. Based on the results of beam and column tests, design guidelines for CFRP rehabilitation were proposed. Horizontal and vertical continuities can be provided through the use of CFRP for rehabilitating existing reinforced concrete structures that were designed prior to the introduction of codes that require continuous reinforcement along members and between adjacent members. The vulnerability of such structures to collapse can be reduced through rehabilitation. / text
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Fire performance of innovative steel-concrete composite columns using high strength steelsEspinos, A., Romero, M.L., Lam, Dennis 14 April 2016 (has links)
yes / This paper presents the results of a numerical investigation on strategies for enhancing the fire behaviour of concrete-filled steel tubular (CFST) columns by using inner steel profiles such as circular hollow sections (CHS), HEB profiles or embedded steel core profiles. A three-dimensional finite element model is developed for that purpose, which is capable for representing the various types of sections studied and the nonlinear behaviour of the materials at elevated temperatures. High strength steel is considered in the numerical model, as a possible way to lengthen the fire endurance. The numerical model is validated against experimental results available in the literature for various types of steel-concrete composite sections using inner steel profiles, obtaining satisfactory results. Based on the developed numerical model, parametric studies are conducted for investigating the influence of the cross-sectional geometry and the steel grade of the inner profiles on the fire performance of these composite columns, for eventually providing some practical recommendations.
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Seismic performance evaluations and analyses for composite moment frames with smart SMA PR-CFT connectionsHu, Jong Wan 01 April 2008 (has links)
This thesis investigates the performance of composite frame structures with smart
partially-restrained (PR) concrete filled tube (CFT) column connections through
simplified 2D and advanced 3D computational simulations. It also provides a design
methodology for new types of innovative connections based on achieving a beam hinging
mechanism. These types of connections intend to utilize the recentering properties of
super-elastic SMA tension bars, the energy dissipation capacity of low-carbon steel bars,
and the robustness of CFT columns.
In the first part of this study, three different PR-CFT connection prototypes were
designed based on a hierarchy of strength models for each connection component.
Numerical simulations with refined three dimensional (3D) solid elements were
conducted on full scale PR-CFT connection models in order to verify the strength models
and evaluate the system performance under static loading. Based on system information
obtained from these analyses, simplified connection models were formulated by replacing
the individual connection components with spring elements and condensing their
contributions. Connection behavior under cyclic loads was extrapolated and then
compared with the monotonic behavior.
In the second part of this study, the application of these connections to low-rise
composite frames was illustrated by designing both 2D and 3D, 4 and 6 story buildings
for the Los Angeles region. A total of 36 frames were studied. Pushover curves plotted
as the normalized shear force versus inter story drift ratio (ISDR) showed significant
transition points: elastic range or proportional limit, full yielding of the cross-section,
strength hardening, ultimate strength, and strength degradation or stability limit. Based
on the transition points in the monotonic pushover curves, three performance levels were
defined: Design Point, Yield Point, and Ultimate Point. All frames were stable up to the
yield point level. For all fames, after reaching the ultimate point, plastic rotation
increased significantly and concentrated on the lower levels. These observations were
quantified through the use of elastic strength ratios and inelastic curvature ductility ratios.
The composite frames showed superior performance over traditional welded ones in
terms of ductility and stability, and validated the premises of this research.
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Sportovní centrum / Sports CentreSauer, Vít January 2018 (has links)
The content of the master´s thesis is new building sports hall of ball sports. This building has contains no cellar and three above-ground floors. In ground floor, there are playing area, changing rooms, relevant functional facilities including utility rooms. The first floor is completely reserved for spectators, there are tribune for sitting spectators, gallery for standing spectators, hygienic rooms and buffet for spectators. In the third floor, there are rooms for VIP spectators, briefing room, head office of sports hall including conference room, spaces for TV transmission, hygienic rooms and utility room. Object is based on concrete foundation pads and strips foundation. Structural system of the object is combination of column system from cast-inplace reinforced concrete and wall system from brickwork. Floor structures over above the first and second floor are designed as castin- place reinforced concrete, floor structure above the third floor is folded from wood beams. Loadbearing structure of roof is system of glue laminated timber girders, roof cladding is mechanically anchored.
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