moment curvature relationship of reinforced concrete members

... = width of beam D = dead load E = modulus of elasticity h = depth of member, blacktop thickness I = moment of inertia I cr = moment of inertia at cracked section Ie = effective moment of inertia ... moment diagram where the cracking moment Mcr is exceeded in the positive moment region Calculation of effective moment of inertia should be based on maximum moment conditions in all regions of ... inertia Ig = moment of inertia of gross concrete section Temperature-Induced Deflections k = constant L = Live load, span length M = bending moment Mcr = cracking moment n = distance of neutral...

Ngày tải lên: 24/10/2014, 22:01

Ngày tải lên: 23/03/2014, 20:34

... forces of concrete and reinforcement, the depth of the concrete compression zone can be calculated Then the moment capacity can be calculated by integrating the moment contributions of concrete ... compression stress–strain relationship of concrete should be able to consider the effects of confined concrete (for example, Mander et al [7]) The resulting axial force and moment of concrete and reinforcement ... development of an ultimate curvature, φu , based on moment- curvature analysis of the critical sections considering reinforcement strainhardening and concrete confinement as appropriate Ultimate curvature...

Ngày tải lên: 08/07/2014, 12:20

... humidity of environment, age of concrete and crack level of concrete, as shown in Eq 2.18 A new model “LifeConBridge” was successfully formulated to predict the service life of reinforced concrete ... service life of reinforced concrete structures due to chloride penetration - Code T2013-CT-23; 4/ Dinh, D.V and Cau, B.T., “A predictive pattern of the service life of reinforced concrete structures” ... service life of structures relating to reinforcement corrosion” The author proposed a two-stage model of the service life of reinforced concrete structures, which considered D as a constant of time...

Ngày tải lên: 26/09/2014, 09:43

... American Concrete Institute 307-69 Specification for the Design and Construction of Reinforced Concrete Chimneys 307-88 Standard Practice for the Design and Construction of Cast-in-Place Reinforced Concrete ... of the Across-Wind Response of Chimneys,” Journal of Wind Engineering and Industrial Aerodynamics, V 14, Amsterdam, 1985, pp 153166 Rumman, W S., Reinforced Concrete Chimneys,” Handbook of Concrete ... Strength Design of Reinforced Concrete Chimneys,” ACI JOURNAL, Proceedings V 74, No 4, Apr 1977, pp 179-184 24 Hognestad, E., “Study of Combined Bending and Axial Load in Reinforced Concrete Members, ”...

Ngày tải lên: 24/10/2014, 15:45

... ratio of area of vertical outside face reinforcement to total area of concrete shell (Chapter 6) ratio of area of circumferential outside face reinforcement per unit of height to total area of concrete ... STV = = (6-1b) thermal coefficient of expansion of concrete and of reinforcing steel, to be taken as 0.0000065 per F (0.0000117 per C) modulus of elasticity of concrete, psi (MPa) – ρn(γ1 + 1) ... of two sets of cylinders (consisting of three specimens each) per 8-hr shift (slipform) or per lift (jump form) For precast sections, a minimum of two sets shall be taken from each class of concrete...

Ngày tải lên: 24/10/2014, 15:46

... modulus of elasticity of concrete modulus of elasticity of concrete at transfer of stress modulus of elasticity of prestressing strand modulus of elasticity of steel flexural stiffness of compression ... of the balanced conditionload moment relationship clear span length of slab (Chapter 10) length of short span of slab length of long span of slab effective width of concrete slab resisting wheel ... degree of fixity in the foundation (Chapter 11) ratio of stiffness of column to stiffness of members at B end resisting column bending average ratio of stiffness of column to stiffness of members...

Ngày tải lên: 24/10/2014, 16:04

Ngày tải lên: 24/10/2014, 22:00

Ngày tải lên: 14/11/2014, 11:16

... of HS-20 and HL-93 Load Models for Calculation of Maximum Positive Moment 63 Table 2-6 Ratio of Mean Maximum Moments to HL-93 Moments 65 Table 2-7 Causes of Deterioration of ... 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 ... 61 vii 2.7 Consideration of Continued Degradation 68 2.7.1 Modes of Reinforced Concrete Degradation 68 2.7.2 Corrosion of Steel in Concrete 69 2.7.2.1 Carbonation-Induced...

Ngày tải lên: 14/11/2014, 13:32

... behaviour of concrete under rapid loading Exploring the similarities of theories for the creep and dynamic behaviour of concrete is beneficial in view of the application of creep models for concrete ... Stress-Strain Relation For Concrete 19 Figure 2.1 Strain Development of Concrete under Creep Phenomena 39 Figure 2.2 Components of Concrete Deformation at Creep 39 Figure 2.3 Components of Concrete Deformation ... Cross-section of the Specimen member a Specific contents of aggregate of concrete C (t , t ' ) Specific creep function C0 Creep compliance rate c Specific contents of cement of concrete C Creep...

Ngày tải lên: 16/09/2015, 15:54

... series, B1 has 31 MPa of compressive strength of concrete, while B2 has 41 MPa of compressive strength of concrete, and the third series B3 has 39 MPa of compressive strength of concrete Two 12 mm ... compressive concrete strength that were determined by compressive test of concrete cylinders as show in Figure 3.3 3117447484 Figure 3.3 Details of concrete prisms Fabrication of concrete prisms All concrete ... strengths of concrete substrate (31, 41 and 39 MPa) were determined under compressive test of concrete cylinders 31 3.3.2.1 Test specimens The materials, size of concrete prism and process of fabrication...

Ngày tải lên: 12/05/2016, 15:40

Ngày tải lên: 31/10/2016, 21:24

... compressive softening of a concrete cube and crack interaction in a beam 1.3 Objective scope of study A composite model is used to represent the heterogeneity of plain concrete consisting of coarse ... the history of fiber reinforced concrete (FRC) and the modelling of its behaviour in light of fracture mechanics 2.2 A review of fracture mechanics and quasibrittle models The advent of fracture ... Linear Complementarity Problem FRC = Fibre Reinforced Concrete SFRC = Steel Fibre Reinforced Concrete NSC = Normal Strength Concrete HSC = High Strength Concrete TPB = Three-Point Bending FEM =...

Ngày tải lên: 26/05/2014, 17:57

... CONCLUSION General Overview of reinforced concrete corrosion under the effect of chloride ion The reinforced concrete structure is corroded very fast under the effect of chloride ion in marine ... inhibitor 30% of solid calcium nitrite solution Material and research methodology Testing samples 1.Extract of cement water Reinforced concrete samples Material and research methodology Extract of cement ... in concrete Determine the appropriate content of calcium nitrite as Extract of Cement water : Concrete grade M20, M30,M50: -W/C = 0,6; pH = 12,2 -[Cl-]: 1,2kg; 2,4kg and 6kg /m3 -Thickness of...

Ngày tải lên: 13/08/2014, 22:21

... place of sh and the specified yield strength of stirrups in place of fyh Center-to-center spacing of stirrups should not exceed the smallest of 1/4 of the beam width, six times the diameter of longitudinal ... “Application of Headed Bars in Concrete Members, ” PhD dissertation, The University of Texas at Austin, Dec., 303 pp Beckingsale, C W., 1980, “Post-Elastic Behavior of Reinforced Concrete Beam-Column ... Popov, E P., 1977, “Seismic Behavior of Ductile Moment- Resisting Reinforced Concrete Frames,” Reinforced Concrete Structures in Seismic Zones, SP-53, American Concrete Institute, Farmington Hills,...

Ngày tải lên: 24/10/2014, 16:04

... center of bar to extreme tension fiber, in modulus of elasticity of concrete, ksi modulus of elasticity of reinforcement, ksi effective modulus of elasticity of steel to that of concrete modulus of ... of concrete, psi stress in reinforcement, ksi steel stress after crack occurs, ksi compressive strength of concrete, psi tensile strength of concrete, psi the ratio of modulus of elasticity of ... the well-known effective moment of inertia concept Both of these approaches appear to be acceptable for the analysis of onedimensional members CRACKING OF CONCRETE MEMBERS IN DIRECT TENSION...

Ngày tải lên: 24/10/2014, 17:40

... 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, ... intended and unintended (wobble) curvature in the tendons c elastic shortening of concrete d creep of concrete e shrinkage of concrete f relaxation of steel The amount of prestress loss due to these ... section 5.7.3.2 -Long-Term Camber/Deflection Icr = moment of inertia of cracked section transformed to concrete, in (m4) Ig = moment of inertia of gross concrete section about the centroidal axis, neglecting...

Ngày tải lên: 24/10/2014, 21:58

... perimeter of the slab critical section, in dimension of the column transverse to the direction of moment transferred to the column, in dimension of the column transverse to the direction of moment ... is the ratio of the lengths of the sides of the slab critical section measured parallel and transverse to the direction of moment transfer, respectively The shear stresses due to moment transfer ... 4.3.2 Moment transfer strength is the smaller of the following: (a) Design flexural strength of the slab at the face of the support over a width equal to that of the column strip (b) Sum of the...

Ngày tải lên: 24/10/2014, 22:00

... that both of these vibration-type tests measure essentially the same characteristic of the freshly mixed concrete The exact nature of the relationships of Fig and will vary from one concrete to ... resistance of concrete at an early age has prompted the proposal of several methods These involve measurement of the length and width of concrete cracks Ring, rectangular, square, and combinations of ... Length Change of Drilled or Sawed Specimens of Cement Mortar and Concrete Standard Test Method of Abrasion Resistance of Concrete by Sandblasting Standard Test Method for Static Modulus of Elasticity...

Ngày tải lên: 24/10/2014, 22:11