7— cast in place conventionally reinforced concrete structures
guide to residential cast-in-place concrete construction
Ngày tải lên :
24/10/2014, 16:03
... down on these fines to avoid stickiness in concrete finishing If there is not enough fine material, the concrete may bleed excessively and cause a delay in finishing A mix that contains too much ... before casting the concrete in the footings and should then be promptly replaced to insure proper protection of the concrete during the curing period Where unstable soil conditions exist, or in Seismic ... 10-CURING, SAWING, SEALING, AND WATERPROOFING 10.1-General Properly mixed, placed, and finished concrete also requires proper curing This involves preventing loss of moisture from the concrete...
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recommendations for design of beam-column connections in monolithic reinforced concrete structures
Ngày tải lên :
24/10/2014, 16:04
... assume that extensive inclined cracking would occur in the joint Tests indicate that initial inclined cracking in well-confined interior joints occurs at levels of nominal shear stress of approximately ... “Seismic Behavior of Ductile Moment-Resisting Reinforced Concrete Frames,” Reinforced Concrete Structures in Seismic Zones, SP-53, American Concrete Institute, Farmington Hills, Mich., pp 247-291 Bertero, ... A.5—Distribution of plastic hinges A.6—Innovative joint designs A.7—Special joint configurations and loadings A.8—Joints in existing structures Appendix B—Design examples, p 352R-20 CHAPTER 1—INTRODUCTION,...
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recommendations for design of slab-column connections in monolithic reinforced concrete structures
Ngày tải lên :
24/10/2014, 22:00
... Monolithic Reinforced Concrete Structures American National Standards Institute ANSI A.58.1-82 Building Code Requirements for Minimum Design Loads in Buildings and Other Structures International ... identical in meaning to the unbalanced moment as defined in ACI 318 Performance of a connection can be affected by behavior of the joint (including slip of reinforcement embedded in the joint) and ... resisting system Slab-column framing is inappropriate for such applications These recommendations are limited to slab-column connections of cast- in- place reinforced concrete floor construction, including...
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emulating cast-in-place detailing in precast
Ngày tải lên :
24/10/2014, 22:11
... the cast- in- place slab and the precast floor with cast- in- place topping is the jointing The jointing in the precast supporting the diaphragm slab tends to reflect as cracks in the cast- in- place ... using high-strength non-shrink grout EMULATING CAST- IN- PLACE DETAILING IN PRECAST CONCRETE STRUCTURES Fig 11—Variations of splices and cast- in- place closure placements to create vertical joints ... CAST- IN- PLACE DETAILING IN PRECAST CONCRETE STRUCTURES 550.1R-13 Fig 21—Longitudinal joint between precast concrete partial thickness slabs with a cast- in- place topping welded-wire fabric in diaphragms...
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development of load and resistance factor design for frp strengthening of reinforced concrete structures
Ngày tải lên :
14/11/2014, 13:32
... bonded fiber reinforced polymer composites (FRPs) are increasingly considered as a viable means of strengthening, retrofitting, and repairing existing reinforced concrete structures In appropriate ... The Concrete Society, 2000 Strengthening Reinforced Concrete Structures with Externally-Bonded Fibre Reinforced Polymers from ISIS Canada, 2001 (Neale, 2001) FRP Strengthening of Existing Concrete ... bonded fiber reinforced polymer composites have shown promising performance as a means of strengthening existing reinforced concrete structures As the infrastructure of our country continues to become...
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Design of modern highrise reinforced concrete structures hiroyuki aoyama
Ngày tải lên :
27/04/2016, 23:02
... building 8 Design of Modern Highrise Reinforced Concrete Structures lengths in two directions, varying span lengths in one direction, eliminating one span each at four corners, eliminating one ... considering the inevitable use of cast- inplace concrete at some critical portions such as diaphragm or joint of precast members, the extent of precasting in practice has received a divergence of opinions ... Reinforced Concrete Buildings using High Strength Concrete and Reinforcement", was conducted in 1988-1993 by the coalition of many research organizations in Japan with the Building Research Institute...
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Evaluating the long-term durability of fiber reinforced polymers via field assessments of reinforced concrete structures
Ngày tải lên :
12/05/2017, 22:38
... reinforcement for existing reinforced concrete structures Castlewood Canyon Bridge, built in 1946 and repaired in 2003, is a reinforced concrete arch bridge that spans Cherry Creek in Castlewood Canyon ... 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, ... result in missing areas of voids or defects 27 2.3.2 Thermalgraphic imaging ASTM D4788-03 (Reapproved in 2007), Detecting Delaminations in Bridge Decks Using Infrared Thermography, is intended...
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control of deflection in concrete structuresstate-of-the-art report on fiber reinforced plastic (frp) reinforceme
Ngày tải lên :
24/10/2014, 17:25
... FRP reinforcement for concrete structures, is explained in more detail later in the report The concrete industry's primary interest in FRP reinforcement is in the fact that it does not ordinarily ... of concrete beams reinforced only with GFRP reinforcing bars and in combination with steel reinforcing bars The study used test results to determine if the theory used for steel reinforced concrete ... Principal fibers in commercial use for production of civil engineering applications, including composite -reinforced concrete, are glass, carbon, and aramid The most common form of fiber-reinforced...
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Numerical simulation of fracture in plain and fibre reinforced concrete
Ngày tải lên :
26/05/2014, 17:57
... obtained using a mathematical programming procedure in the form of a linear complementary problem Fibre particles are modelled by introducing additional linear elements interconnecting distant interface ... fracture in plain concrete and fibre reinforced concrete and is organised into nine chapters and three appendices Each chapter starts with an introduction and ends with a summary The introduction ... analysis of various fracture modes in a plain concrete beam under four point bending with several notches and examines the interacting crack itineraries by identifying the various equilibrium solutions...
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báo cáo khoa học: "CyberKnife® enhanced conventionally fractionated chemoradiation for high grade glioma in close proximity to critical structures" pdf
Ngày tải lên :
10/08/2014, 22:21
... treatment planning Treatment planning MRI imaging was completed selectively to enhance target and critical structure delineation when clinically indicated Target volumes and critical structures were ... constraints was maintained (Table 1) CyberKnife Treatment Planning Parameters Treatment Volume Treatment volume was defined as the volume contoured on the planning CT scan by the treating neurosurgeon ... cm margin when clinically indicated In this study, there was no limit set on the treatable target volumes Homogeneity Index The homogeneity index (HI) describes the uniformity of dose within a...
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DETERMINATION OF THE APPROPRIATE CONTENT OF CALCIUM NITRITE AS A CORROSION INHIBITOR IN REINFORCED CONCRETE docx
Ngày tải lên :
13/08/2014, 22:21
... inhibition in extract of cement water containing Cl-: • In H0 extract, steel is maintained in passive state and not corroded • The extract containing Cl-: corrosion rate is continuously increased ... 21 Figure Corrosion inhibition ability of CN in concrete grade M20 containing 2,4 kg Cl-/ m3 B9 B10 B11 B12 B13 B14 24 Image 9: Reinforcement in concrete grade M20 containing CN and 2,4 kg ion ... 21 24 Figure 10 Corrosion inhibition ability of CN in concrete grade M20 containing kg Cl-/ m3 B15 B16 B17 B18 Image 10: Reinforcement in concrete grade M20 containing CN and 6,0kg ion Cl- Research...
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Prediction of service life due to the exposure of chlorides of reinforced concrete bridges near coastal areas in Vietnam = Dự báo tuổi thọ sử dụng của cầu bê tông cốt thép ven biển Việt Nam do xâm nhập clo (tóm tắt + toàn văn)
Ngày tải lên :
26/09/2014, 09:43
... OF CONCRETE BRIDGES IMPACTED BY CHLORIDE PENETRATION IN THE WORLD AND IN VIETNAM 1.1 Introduction The reinforced concrete bridges in Vietnam are now being designed with advanced standards and integration ... Membrane + Painting To use a combination of the above methods The methods to increase the corrosion propagation time: Painting of reinforcement by using epoxy, coating or galvanizing CONCLUSIONS ... Magazine of Transport and Communications, issue 25/2009; 5/ Dinh, D.V “Analyzing of reinforced concrete structures with taking effect of stiffness reduction caused by cracking” - Scientific Magazine...
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control of cracking in concrete structures
Ngày tải lên :
24/10/2014, 15:46
... Sealing Joints for Concrete Structures 544.2R Measurement of Properties of Fiber -Reinforced Concrete 544.3R Guide for Specifying, Proportioning, Mixing, Placing, and Finishing Steel Fiber Reinforced ... shrinkage-compensating concrete in minimizing or preventing shrinkage cracking of exposed concrete surfaces, it is important that positive and uninterrupted water curing (wet covering or ponding) ... found in ACI 209R Cracking due to drying shrinkage can never be eliminated in most structures This chapter covers cracking of hardened concrete due to drying shrinkage, factors influencing shrinkage,...
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prediction of creep, shrinkage, and temperature effects in concrete structures
Ngày tải lên :
24/10/2014, 16:03
... differential shrinkage strain, also subscript denoting differential strain or differential stress shrinkage strain in in. /in or mm/mm at any time ultimate (in time) shrinkage strain in inc. /in or mm/mm ... assuming the strain at loading (nominal elastic strain) as the instantaneous strain at any time The above definition treats the initial instantaneous strain, the creep strain, and the shrinkage ... temperature The above definition includes drying shrinkage, autogenous shrinkage, and carbonation shrinkage a) b) c) Drying shrinkage is due to moisture loss in the concrete Autogenous shrinkage is caused...
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analysis and design of reinforced concrete bridge structures
Ngày tải lên :
24/10/2014, 16:04
... restrained, induces compressive strains that are intended to approximately offset tensile strains in the concrete induced by drying shrinkage Concrete, structural lightweight -Concrete containing ... resource information Air-entraining admixtures are used in bridge concrete to improve the durability of concrete in freeze-thaw cycling, particularly in the presence of deicing chemicals containing ... splice reinforcing bars All welding of reinforcing bars should conform to “Structural Welding Code-Reinforcing Steel” AWS D1.4 Reinforcing bars to be welded should be indicated on the drawings and...
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control of deflection in concrete structures
Ngày tải lên :
24/10/2014, 17:25
... (0.003 in. /in. ) strain at first cracking load strain in prestressed reinforcement at ultimate flexure unit shrinkage strain in concrete shrinkage strain at any time r average value of ultimate shrinkage ... used and inputting these in the finite element models 2.7—Temperature-induced deflections Variations in ambient temperature significantly affect deformations of reinforced concrete structures ... ultimate shrinkage Eshm = = reinforcement ratio P = = = l Principle authors: A Scanlon and C T Hsu II DEFLECTION IN CONCRETE STRUCTURES 4.2-Introduction Building Code Requirements for Reinforced Concrete...
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causes, evaluation and repair of cracks in concrete structures
Ngày tải lên :
24/10/2014, 17:37
... Concrete 207.4R Cooling and Insulating Systems for Mass Concrete 224R Control of Cracking in Concrete Structures 224.2R Cracking of Concrete Members in Direct Tension 224.3R Joints in Concrete Construction ... 1.3.4 Weathering-The weathering processes that can cause cracking include freezing and thawing, wetting and drying, and heating and cooling Cracking of concrete due to natural weathering is usually ... and the use of plastic sheeting to cover the surface between finishing operations Windbreaks to reduce the wind in concrete is restrained drying shrinkage Drying shrinking is caused by the loss...
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in-place methods to estimate concrete strength
Ngày tải lên :
24/10/2014, 17:44
... Pretesting meeting—As discussed in Section 4.3, there are many reasons for determining the in- place strength of concrete in existing structures In- place testing is often one facet of an overall investigation ... testing field-cured cylinders for estimating in- place strength for the purpose of terminating curing procedures ACI 308.1 also mentions in- place tests as acceptable methods for estimating in- place ... the most established and accepted measure of in- place strength Cast- in- place cylinders are also useful in determining the in- place strength of new concrete, and their use does not require a pre-established...
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finite element analysis of fracture in concrete structures state of the art
Ngày tải lên :
24/10/2014, 21:58
... add insight into the more complex behavior evidenced in reinforced concrete structures In what follows, short descriptions (listed in chronological order) of finite element analyses of unreinforced ... Analysis of Reinforced Concrete Structures, edited by C Meyer and H Okamura, ASCE, New York, pp 184-203 Darwin, D., 1993, Reinforced Concrete, ” Chapter 4, Finite Element Analysis of Reinforced Concrete ... tends asymptotically to infinity at a point Singular crack tip element—A finite element with a strain singularity included in its shape function, for use in finite element modeling of LEFM problems...
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reinforced concrete design for thermal effects on nuclear power plant structures
Ngày tải lên :
24/10/2014, 22:00
... corresponding concrete strain is in the neighborhood of 0.0005 in. /in For extreme fiber concrete compressive strains greater than 0.0005 in. /in but less than 0.001 in. /in. , the differences are insignificant ... are sufficiently accurate for concrete strains not exceeding 0.001 in. /in For concrete strains greater than 0.001 in. /in. , the equations identified above will result in cracked member thermal moments ... mechanical loads, including factored moment due to Tm - Tb = internal axial force at section center line due to factored mechanical loads, including factored axial force due to Tm - Tb = final internal...
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