— circular wire and strand wrapped prestressed concrete environmental structures
Response Spectra and Seismic Analysis for Concrete Hydraulic Structures
... apply to concrete hydraulic structures including locks, intake towers, earth retaining structures, arch dams, conventionaland Roller Compacted Concrete (RCC) gravity dams, powerhouses, and critical ... capacity of the mass concrete would be exceeded, and somecracking and crushing of the concrete and yielding of reinforcing steels could occur Prediction of theactual response and estimation of the ... design and evaluation of the Corps of Engineers hydraulic structures These include locks, intaketowers, earth retaining structures, arch dams, conventional and RCC gravity dams, powerhouses, andcritical
Ngày tải lên: 05/05/2018, 14:17
Application of strut and tie concepts to prestressed concrete bridge joints in seismic regions
... bent with cast-in-place steel shell circular columns 100 percent 2 knee joints and | tee joint Silva et al.! and knee joint forces, and moment and shear force diagrams at column ... and flexural actions whose relative magnitudes and thus dominant action can be different at the service and ultimate limit states As demonstrated by Bhide and Collins?® on shear panels with and ... joints, corbels, and membranes with open- ings, when subjected to static loading More recently, strut-and-tie model concepts have been applied in order to understand structural behavior and ap- propriately
Ngày tải lên: 12/10/2016, 18:39
BỘ NEO CÁP CƯỜNG ĐỘ CAO - NEO TRÒN T13, T15 VÀ NEO DẸT D13, D15. Prestressed concrete anchors - round anchor T13, T15 and flat anchor D13, D15
... bê tông dự ứng lực - Phần 4: Dảnh - ASTM A416/A416M-10: Standard Specification for Steel Strand, Uncoated Seven Wire for Prestressed Concrete - Tiêu chuẩn kỹ thuật bó cáp dự ứng lực 7 sợi, không ... 10138:2006: Prestressing Steels - Cáp dự ứng lực - BS 5896:2012: High tensile steel wire and strand for the prestressing of concrete Specification - Sợi và bó cáp thép cường độ cao cho bê tông dự ứng ... Bộ neo cáp cường độ cao (Prestressed concrete anchors) - Bộ neo cáp dự ứng lực dùng trong kết cấu bê tông cốt thép dự ứng lực 3.2 Cáp dự ứng lực (Prestressing teel strand) - Cáp thép dự ứng lực
Ngày tải lên: 01/03/2022, 13:26
commentary on design and construction of reinforced concrete chimneys (aci 307-98)
... Chapter 3—Construction requirements, p 307R-3 3.3—Strength tests 3.4—Forms 3.5—Reinforcing placement Chapter 4—Service loads and general design criteria, p 307R-3 4.1—General 4.2—Wind loads 4.3—Earthquake ... Introduction, p 307R-2 Chapter 1—General, p 307R-3 1.1—Scope 1.4—Reference standards Chapter 2—Materials, p 307R-3 Commentary on Design and Construction of Reinforced Concrete Chimneys (ACI 307-98) ... 4.3—Earthquake loads 4.5—Deflection criteria Chapter 5—Design of chimney shell: Strength method, p 307R-7 5.1—General 5.3—Required strength 5.4—Design strength 5.5—Nominal moment strength 5.6—Design for
Ngày tải lên: 24/10/2014, 15:45
design and construction of reinforced concrete chimneys (aci 307-98)
... 3.1—General 3.2—Concrete quality 3.3—Strength tests 3.4—Forms 3.5—Reinforcement placement 3.6—Concrete placement 3.7—Concrete curing 3.8—Construction tolerances 3.9—Precast erection Chapter 4—Service ... Chapter 1—General, p 307-2 1.1—Scope 1.2—Drawings 1.3—Regulations 1.4—Reference standards Chapter 2—Materials, p 307-2 2.1—General 2.2—Cement 2.3—Aggregates 2.4—Reinforcement Chapter 3—Construction ... 5.1—General 5.2—Design loads 5.3—Required strength 5.4—Design strength 5.5—Nominal moment strength: Circular shells 5.6—Noncircular shapes 5.7—Design for circumferential bending Chapter 6—Thermal
Ngày tải lên: 24/10/2014, 15:46
guide for use of normal weight and heavyweight aggregates in concrete
... proportions3.3—Slump and workability3.4—Pumpability 3.5—Bleeding3.6—Finishing characteristics of unformed concrete3.7—Air content 3.8—Other properties Chapter 4—Effects of processing and handling of ... properties of freshly mixed and hardened concrete, p 221R-15 4.1—General4.2—Basic processing 4.3—Beneficiation4.4—Control of particle shape4.5—Handling of aggregates4.6—Environmental concerns ACI ... 2Chapter 5—Quality assurance, p 221R-205.1—General 5.2—Routine visual inspection 5.3—Routine control testing 5.4—Acceptance testing 5.5—Record keeping and reports Chapter 6—Marginal and recycled
Ngày tải lên: 24/10/2014, 15:48
prediction of creep, shrinkage, and temperature effects in concrete structures
... shored and unshored constructions 4.4-Loss of prestress and camber in noncomposite prestressed beams 4.5-Loss of prestress and camber of composite pre-cast and prestressed-beams unshored and shored ... changes, sustained loading, andtemperature on reinforced and prestressed concretestructures Material response, factors affecting the struc-tural response, and the response of structures in whichthe ... Moist nets and Rooms Used in the Testing Hy- draulic Cements and Concretes” Cabi-“Standard Test Method for Creep of Concrete in Compression” “Standard Method for Securing, paring, and Testing
Ngày tải lên: 24/10/2014, 16:03
removal and reuse of hardened concrete
... ball. 2.3—Types and degrees of removal2.4—Types of concrete and effects on removal and reuse2.5—Monitoring and safety considerations Chapter 3—Removal methods, p 555R-6 3.1—Introduction3.2—Hand tools3.3—Hand-operated ... tools3.3—Hand-operated power tools3.4—Vehicle-mounted equipment3.5—Explosive blasting 3.6—Drills and saws3.7—Nonexplosive demolition agents3.8—Mechanical splitters 3.9—Demolition of concrete structures ... on removal and reuse 2.4.1 General—Concrete structures can be classified gen-erally into four groups: mass concrete structures; ground structures; reinforced concrete structures; andprestressed/post-tensioned
Ngày tải lên: 24/10/2014, 17:26
concrete shell structures practice and commentary
... loads and to control deflection and cracking As with conventional prestressed structures, the analysis must be made at design and at ultimate loads to ensure both proper behavior at design loads and ... large deflections, creep effects, and the deviation between the actual and theoretical shell surface 4.1.1 Unless otherwise stated, concrete and steel stresses and load factors will be as specified ... pre-cast), Y’S in for welded wire fabric, and 1 in for prestressed tendons In no case shall the cover be less than the diameter of bar, prestressed tendon, or duct 4.5.2 If greater concrete cover is required
Ngày tải lên: 24/10/2014, 21:58
state-of-the-art report on partially prestressed concrete
... extreme concrete fiber, is easier andleads to results similar to those obtained using the zero cur-vature moment 2.5—Shear and torsion 2.5.1 General—Nonprestressed and fully prestressed concrete ... Code for Concrete Structures (1978), published by CEB-FIP, defines three classes ofprestressed concrete structures: Class 1—Structures in which no tensile stress is permitted in the concrete ... Chapters 4 and 5 of this report). Trang 21.4—Advantages and disadvantages of partial 2.5—Shear and torsion Chapter 3—Time-dependent behavior, p 423.5R-12 4.2—Material fatigue strength 4.3—Fatigue
Ngày tải lên: 24/10/2014, 22:01
Efficient progressive collapse analysis for robustness evaluation and enhancement of steel concrete composite buildings
... frames and truss structures under static and dynamic loadings The second part of the verification study involves progressive collapse behaviors of reinforced concrete and composite slab, and the ... the ultimate and post-ultimate strength well Some notable studies adopting simplified FEA include the work by Kim and Kim (2009b), Marjanishvili and Agnew (2006) and Kaewkulchai and Williamson ... Geometries of circular dome and geodesic dome 105 Figure 3.10: Static response of circular dome under gravity load: Comparison between the present study and numerical study by Thai and Kim (2009)
Ngày tải lên: 10/09/2015, 09:10
Energy generation What does copper wire and magnets have to do with Electricity?
... field is moving relative to the copper wire, or the copper wire is moving relative to the magnetic field If you place a magnet and a conductor (copper wire), in a room together there will be ... in a power plant, and then sent out over a power grid to your homes, and ultimately to your power outlets.Trang 3The movement of charges suchas electrons is called current, and this electrical ... copper wire and magnets moving relative to one another In this case, wind power applies a force to the blades that turns them The spinning blades, spin an armature that turns the copper wire
Ngày tải lên: 26/01/2016, 21:05
Current status of environment and propose to apply an environmental management system follows an international standard organization 14001 at line 1 pha lai thermal power joint stock company
... Environmental Science and ManagementStudent name : La Thi Thuy Thesis Title : Current status of environment and propose to apply an environmental management systemfollows an international standard ... gaining environmental benefits is justified, also inLine.1 - Pha Lai Thermal Power JSC.Keywords: Environmental problems, environmental pollutants, environmental management system, international standardorganization ... for Standardization(International Organization for Standardization), was established in 1946 andformal operations on 02.23.1947 for the purpose of building standards forproduction trade and information
Ngày tải lên: 28/04/2016, 13:38
design and construction of circular wire- and strand-wrapped prestressed concrete structures
... OF PRESTRESSED CONCRETE STRUCTURES 372R-7 Fig 2.1—Typical wall section of a wire- or strand- wrapped, cast-in-place, vertically prestressed tank Fig 2.2—Typical wall section of a wire- or strand- wrapped, ... circular wire- or strand- wrapped prestressed concrete structure Tendon—A steel element, such as wire, bar, cable or strand, or a bundle of such elements, used to impart prestress to concrete ... recommendations 5.2—Liquid-loss limit 5.3—Visual criteria 5.4—Repairs and retesting Chapter 6—References, p 372R-19 6.1—Referenced standards and reports 6.2—Cited references Appendix A—Recommendations and considerations...
Ngày tải lên: 24/10/2014, 17:26
analysis and design of reinforced and prestressed-concrete guideway structures
... deflection, cracking and fatigue control under specified loading combinations Type of Steel Prestressing Stage Stress-relieved strand and wire, fpu = 0.85 fP” Low relaxation strand and wire, fpu = 0.90 ... 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 ... the concrete and the nonprestressed reinforcement The stress limitations are discussed in Sections 5.5 and 5.8 5.3.2 - Prestressed Members 5.3.2.1 -Concrete Flexural stresses in prestressed concrete...
Ngày tải lên: 24/10/2014, 21:58
analysis and design of reinforced concrete bridge structures
... tendons-Strands, wire, or highstrength bars are used for tendons in prestressed concrete a Strands Two grades of seven -wire, uncoated, stress-relieved steel strand are generally used in prestressed concrete ... high 2.6.2 Reinforced, partially prestressed, and prestressedThis report covers use of reinforced concrete, partially prestressed concrete, and fully prestressed concrete The possible use of pretensioning ... Admixtures for Concrete M 195-84 Lightweight Aggregates for Structural Concrete Uncoated Seven -Wire Stress-Relieved Strand M 203-83 for Prestressed Concrete Uncoated Stress-Relieved Wire for Prestressed...
Ngày tải lên: 24/10/2014, 16:04
design and construction of circular prestressed concrete structures with circumferential tendons
... MANUAL OF CONCRETE PRACTICE 3.3—Wall design 3.4—Roof design Chapter 4—Construction procedures, p 373R-9719 4.1 Concrete 4.2—Shotcrete 4.3—Forming 4.4—Nonprestressed steel reinforcement 4.5—Prestressing ... 373R-97-23 5.1—Testing 5.2—Acceptance criteria 5.3—Visual criteria 5.4—Repairs and retesting Chapter 6—References, p 373R-97-23 6.1—Recommended references 6.2—Cited references CHAPTER 1—GENERAL 1.1—Introduction ... 4.5—Prestressing tendons 4.6—Tolerances 4.7—Seismic cables 4.8—Waterstops and sealants 4.9—Elastomeric bearing pads 4.10—Sponge rubber Fillers 4.11—Cleaning and disinfection Chapter 5—Acceptance criteria...
Ngày tải lên: 24/10/2014, 17:26
Numerical analysis of externally prestressed concrete beams part 2
... are two kinds of beam, namely, conventionally prestressed concrete beam with external cables (below referred as “typical beam”) and prestressed concrete beam with large eccentric cables (below ... of the lack of bond between the concrete and the cable -110- External Cable Imaginary concrete strain at cable level Deviator Concrete beam Fig.6.1 Imaginary concrete strain at the cable level ... the deviators and loading arrangement for the beams prestressed with external cables Both the effects of friction at the deviators and loading arrangement on the ultimate strength and increase...
Ngày tải lên: 07/11/2012, 11:04
Numerical analysis of externally prestressed concrete beams part 1
... non -prestressed reinforcement in addition to the prestressing cables in the tension zone Prestressed Concrete Beams Bonded Prestressed Concrete Beams Perfectly Bonded Unbonded Prestressed Concrete ... namely, prestressed concrete beams with bonded cables and prestressed concrete beams with unbonded cables And in each group, beams can be divided into small subgroup For example, beams prestressed ... of concrete flanges and folded steel web or extradosed bridges with a short tower In this chapter, the definition of post-tensioned prestressed concrete beams and classification of beams prestressed...
Ngày tải lên: 07/11/2012, 11:04
Tài liệu Cabling Standard - (Private) - Harvard University - Wire and Cable Standards pptx
... 188 wire troughs (for voice and data) will be mounted across the plywood frame between the VOICE and DATA blocks Cross -wire will run down and through the 188 wire troughs for VOICE and up and ... aware that the standards require all wire be concealed Fishing the walls, wire mold, and conduit placement are three methods of concealing wires The University standard for station wire is to fish ... Composition Composed of a 12 -strand 62.5 multi-mode and 10/125 um 12 strand single mode fiber riser rated cable, installed in innerduct, home run from the IDF to the MDF All strands must be terminated...
Ngày tải lên: 24/01/2014, 03:20