7—field performance of prestressed concrete structures
Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures
... Mode G: cohesive failure in concrete substrate 70 3.44 Failure Modes of Pull-off Tests from 2003 and 2011 71 3.45 Histogram of Pull-off Test Strength 74 3.46 PDF of Pull-off test results 74 3.47 ... length of rebar, Hu et al (2004) describes the importance of bond to the performance of the composite, “The usual strengthening method is to bond the FRP laminates on the surface of concrete structures, ... DURABILITY OF FIBER REINFORCED POLYMERS VIA FIELD ASSESSMENTS OF REINFORCED CONCRETE STRUCTURES Fiber Reinforced Polymer Composites (FRP) are an attractive repair option for reinforced concrete structures, ...
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design and construction of circular prestressed concrete structures with circumferential tendons
... modulus of elasticity of concrete under short-term load, psi Eci = modulus of elasticity of concrete at age ti, psi Es = modulus of elasticity of reinforcement, assumed to be the same for prestressed ... Related Concrete Structures 350 R Environmental Engineering Concrete Structures 350.1 R Testing Reinforced Concrete Structures for Watertightness 350.2 R Concrete Structures for Containment of Hazardous ... Cast-in-Place Concrete • Precast Concrete d Wall-Roof Joints • Hinged • Fixed • Partially Fixed • Free e Roofs • Concrete Dome Roofs with Prestressed Dome Ring (1) Cast-in-place Concrete (2) Shotcrete...
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design and construction of circular wire- and strand-wrapped prestressed concrete structures
... 2.4.2 Dome roofs 2.4.2.1 Design method Concrete or shotcrete dome roofs should be designed on the basis of elastic shell analysis DESIGN AND CONSTRUCTION OF PRESTRESSED CONCRETE STRUCTURES 372R-11 ... corrosion of steel reinforcement Nonprestressed concrete members should meet the allowable chloride-ions limits of ACI 350-01 In prestressed concrete members where the concrete is separated from the prestressed ... (MPa) Es = modulus of elasticity of steel, lb/in.2 (MPa) f ′c = specified compressive strength of concrete, lb/in.2 (MPa) f ′ci = compressive strength of concrete at time of prestressing, lb/in.2...
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Impact performance of steel concrete steel sandwich structures
... diameter E cm Secant modulus of the concrete Ec Modulus of elasticity of concrete Es Modulus of elasticity of steel F Force F du Ultimate force carrying capacity of impact damaged beam F el Predicted ... with concrete to form composite sandwich structures Lightweight concrete of density < 1450 kg/m3 is used to reduce the overall weight of the sandwich structures Shear transfer capacity of the ... strength on the permanent dent profile of face plate of SCS sandwich (6 mm thick face plate)……… …………….98 Fig 4.10 Effect of fibre on the permanent dent profile of face plate of SCS sandwich (face plate...
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Tài liệu The Design of Prestressed Concrete Bridges ppt
... Reinforced concrete 3.1 General 3.2 The historical development of reinforced concrete 3.3 General principles of reinforced concrete 3.4 Reinforced concrete in bending 3.5 The cracking of reinforced concrete ... intuitive understanding of the behaviour of structures, a thorough understanding of the nature of the various building materials, and an appreciation of the appearance of their structures This distinction ... 44 m diameter spherical concrete dome, resting on concrete walls that are some 30 m high In order to reduce the thrust of the roof, it is made of lightweight concrete, of which the density reduces...
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Construction Stage Analysis of Prestressed Concrete Box Bridge using General Funtions potx
... of concrete at the age of 28 days (35000) Relative Humidity of ambient environment (40 ~ 99) (70) Notational size of member (1) Type of cement>Normal or rapid hardening cement (N, R) Age of concrete ... “Construction stage analysis of prestressed concrete box bridge (FCM) using the Wizard”, and will not be repeated in this tutorial Construction Stage Analysis of Prestressed Concrete Box Bridge (FCM) ... Relative Humidity of ambient environment (40 ~ 99) (70) Notational size of member (1) Type of cement>Normal or rapid hardening cement (N, R) Age of concrete at the beginning of shrinkage (3) ↵...
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Báo cáo lâm nghiệp: "Comparison between field performance of cuttings and seedlings of Eucalyptus globulus" ppsx
... propagated as cuttings and their open pollinated offspring deployed as seedlings Table II Number of replicates of each family and number of families of full sib trials Trial Replicates Families Folgoso ... background of their offspring, the other half being determined by the pollen contribution of unknown value The genetic merit of the mothers is expected to be better than the average of the fathers ... mean of the trial; Fi represents the effect of the ith family, considered random; Mj represents the effect of the jth method of the propagation, considered fixed; Bb represents the effect of the...
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Báo cáo lâm nghiệp: "Nutrient status and field performance of tree seedlings planted in Mediterranean degraded areas" doc
... accumulation of nutrients in the aboveground components of an Aleppo pine ecosystem, For Ecol Manage 141 (2001) 259–269 [3] Alonso C., Herrera C.M., Patterns made of patterns: variation and covariation of ... Region of Valencia (eastern Spain) Our main objectives were (1) to assess the nutritional status of Pinus halepensis and Quercus ilex seedlings planted in two forest soils characteristics of the ... degree of shading [16] In terms of water economy, P halepensis can be considered a drought avoider species as compared to Q ilex [32] Soils developed from limestone and marl cover vast areas of the...
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Báo cáo lâm nghiệp: "Field performance of Pinus pinea and P. halepensis seedlings inoculated with Rhizopogon spp. and outplanted in formerly arable land Javier" ppsx
... recovery of seedlings could be related with the height of competing weeds Nevertheless, more studies are needed to determine the usefulness and possibilities of this simple way of estimating plant performance ... of weeds Competence of weeds is considered a major problem in restoration of abandoned agricultural lands [2, 10] It has been reported that weed competition significantly affects the number of ... the higher relative growth rate of small seedlings compared with that of greater ones The type and quality of the nursery substrate also conditioned seedling performance Although peat:vermiculite...
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Báo cáo khoa học: "Effects of desiccation and freezing on vitality and field performance of broadleaved tree species" ppsx
... exception of a few plants of A pseudoplatanus Plant survival at the end of the growing season was lower compared to the beginning of the season, in all species (figure 4) Most C sativa seedlings of ... dates of planting, of the first survival assessment and of the final survival assessment Effects of desiccation and freezing on seedlings 61 62 K Radoglou and Y Raftoyannis water of known conductivity ... dry weights of the leaf, root and shoot were also measured at the end of growing season, by drying the plant tissues of a sample at 100 °C for 24 h 2.4 Data analysis The effects of desiccation...
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Báo cáo khoa học: "Five-year field performance of two types of Douglas fir mini-plug transplants in three forest sites in France" pot
... to 1991, with the establishment in the Netherlands of the European branch of Arborgen, a subsidiary of Weyerhaeuser Company During this period of time, the mini-plug transplanted in different forest ... former manager of Arborgen-Europe, pers comm.) This resulted in 1) many of the seedlings dropping out of the tray sideways, which caused mis-planting, and 2) a need for hand-replanting of mis-planted ... standards not include any specification in terms of quality of the root systems Nevertheless, a quick survey of the planting material was made at the time of planting; it revealed frequent lateral root...
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Báo cáo khoa học: "The physiological status of Douglas fir seedlings and the field performance of freshly lifted and cold stored stock Conor." ppt
... range test The performance of cold stored stock was compared with that of the freshly planted stock of same lift date using a ttest Results 3.1.3 Shoot cold hardiness 3.1 The pattern of cold hardiness ... study in early June (various durations of storage depending on lift date) The field performance of the seedlings was evaluated following storage 2.4 Field performance At approximately 4-5 week ... until June) was the (split) subplot Each of the three blocks contained one replicate of each of the lifting date by treatment combinations, as a row plot of 30 seedlings Spacing was approximately...
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Báo cáo toán học: "quality and field performance of Douglas fir seedlings under varying degrees of water stress" potx
... layer of gravel Its texture consisted of 62 % coarse sand, 26 % fine sand, % loam and % clay The 20-cm upper layer of soil had % of organic matter, a pH of 5.8 and a cationic exchange capacity of ... the effect of a severe drought after planting on the first-year field performance of seedlings produced by the various treatments, and 4) to identify the best predictors of field performance, ... index of storage, Can J For Res 22 (1992) 1371-1377 [23] Mc Kay H.M., A review of the effect of between of cold roots plant vitality following stresses and planting on nursery stock quality and performance, ...
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Báo cáo khoa học: " Ecophysiology and field performance of black spruce (Picea mariana): a review" ppsx
... and roots of three northern conifers during drought Tree Physiol 6, 293-303 Cyr DR, Buxton GF, Webb DP, Dumbroff Lieffers VJ (1989) Assessment of patterns of response of tree ring growth of black ... permit rapid transport of water out of living cells, preventing formation of intracellular ice crystals (Glerum, 1976) Although black spruce is capable of tolerating some level of frost during the ... increased the rate of decomposition of the forest floor and elevated foliar nutrient concentrations Predictions of northward movements of species are still affected by an apparent lack of knowledge...
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development of load and resistance factor design for frp strengthening of reinforced concrete structures
... 4-3 Histogram of Number of Girders 185 Figure 4-4 Histogram of Deck Width 185 Figure 4-5 Plot of Convergence of Monte Carlo Results as a Function of the Number of Trials ... Upgrading of Concrete Structures with Use of Continuous Fiber Sheets, from the Japanese Society of Civil Engineers, 2001 (Maruyama, 2001) All of these guidelines draw together a large body of research ... of Concrete (Bertolini et al., 2004) 68 Table 2-8 Rates of Corrosion Penetration of Steel in Concrete (Bertolini et al., 2004) 73 Table 2-9 Rates of Corrosion Penetration Based on Concrete...
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A093 design of prestressed concrete 2005
... 28 Design properties of materials 29 2.1 Introduction 29 CONCRETE 2.2 Composition of concrete 30 2.3 Strength of concrete 30 2.4 Deformation of concrete 34 2.5 Predictions of the creep coefficient ... behaviour at all stages of loading is essential The aim of this book is to present a detailed description and explanation of the behaviour of prestressed concrete members and structures both at service ... Professor Gilbert on committees of the Standards Association of Australia and his involvement in the development of the Australian Standard for Concrete Structures, AS 3600–1988 The scope of...
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analysis and design of reinforced and prestressed-concrete guideway structures
... shortening of concrete d creep of concrete e shrinkage of concrete f relaxation of steel The amount of prestress loss due to these causes depends on a number of factors that include, properties of the ... derailment, kip (kN) Base of Napierian logarithms Modulus of elasticity of concrete, psi (Pa) 358.1R-3 Section 5.6.3 Eci = Modulus of elasticity of concrete at Es = Modulus of elasticity of reinforcement, ... provisions for prestressed concrete as well as nonprestressed concrete However, the torsion design provisions in this code are applicable only to nonprestressed concrete and not to prestressed concrete...
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Flexural performance and bond characteristics of FRP strengthening techniques for concrete structures
... Thesis/Practicum submitted to the Faculty of Graduate Studies of The University of Manitoba in partial fulfillment of the requirement of the degree of DOCTOR OF PHILOSOPHY TAREK KAMAL HASSAN MOHAMED ... permission THE UNIVERSITY OF MANITOBA FACULTY OF GRADUATE STUDIES COPYRIGHT PERMISSION FLEXURAL PERFORMANCE AND BOND CHARACTERISTICS OF FRP STRENGTHENING TECHNIQUES FOR CONCRETE STRUCTURES BY TAREK ... to the Library of the University of Manitoba to lend or sell copies of this thesis/practicum, to the National Library of Canada to microfilm this thesis and to lend or sell copies of the film,...
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