SERVICEABILITY OF BEAMS AND ONEWAY SLABS


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1 CHAPTER REINFORCED CONCRETE Reinforced Concrete Design A Fundamental Approach  Fifth Edition Fifth Edition SERVICEABILITY OF BEAMS AND ONEWAY SLABS A. J. Clark School of Engineering Department of Civil and Environmental Engineering 8a SPRING 004 By Dr. Ibrahim. Assakkaf ENCE 454 Design of Concrete Structures Department of Civil and Environmental Engineering University of Maryland, College Park CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 1 Introduction Serviceability of a structure is determined by its Deflection Cracking Etent of corrosion of its reinforcement Surface deterioration of its concrete Surface deterioration can be minimized by proper control of miing, placing, and curing of concrete.
2 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. Introduction This chapter deals with the evaluation of deflection and cracking behavior of beams and oneway slabs. It should give adequate background on the effect of cracking on the stiffness of the member, the shortand longterm deflection performance. Deflection of twoway slabs and plates is presented in Chapter 11. CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 3 Significant of Deflection Significant of Deflection Observation The working stress (WSM) method of design limited the stress in concrete to about 45% of its compressive strength and the stress in the steel to less than 50% of its yield strength. As a result, heavier sections with higher reserve strength resulted as compared to those obtained by the current ultimate strength design.
3 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 4 Significant of Deflection Significant of Deflection Observation Higher strength concrete having values in ecess of 1,000 psi (83 MPa) and higherstrength steels that are used in strength design have resulted in lower values of load factors (e.g., 1.4 to 1. for dead load) and reduced reserve strength. Hence, more slender and efficient members are specified, with deflection becoming a more obvious controlling criteria. CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 5 Significant of Deflection Significant of Deflection Observation Ecessive deflection of floor slab may cause dislocation in the partitions it supports. Ecessive deflection of a beam can damage a partition below. Ecessive deflection of a lintel beam above a window opening could crack the glass panels. In the case of open floors and roofs such as top garage floors, ponding of water can result. Therefore, deflection control criteria are needed.
4 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 6 Significant of Deflection Theoretical Background There are important relations between applied load and stress (fleural and shear) and the amount of deformation or deflection that a beam can ehibit. In design of beams, it is important sometimes to limit the deflection for specified load. So, in these situations, it is not enough only to design for the strength (fleural normal and shearing stresses), but also for ecessive deflections of beams. CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 7 Significant of Deflection Theoretical Background (cont d) P 1 w 1 Figure 1 w P (a) w >> w 1 (b) P >> P 1
5 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 8 Significant of Deflection Theoretical Background (cont d) Figure CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 9 Significant of Deflection Theoretical Background (cont d) Figure 1 shows generally two eamples of how the amount of deflections increase with the applied loads. Failure to control beam deflections within proper limits in building construction is frequently reflected by the development of cracks in plastered walls and ceilings.
6 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 10 Significant of Deflection Theoretical Background (cont d) Beams in many structures and machines must deflect just right amount for gears or other parts to make proper contact. In many instances the requirements for a beam involve: A given loadcarrying capacity, and A specified maimum deflection CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 11 Significant of Deflection Methods for Determining Beam Deflections The deflection of a beam depends on four general factors: 1. Stiffness of the materials that the beam is made of,. Dimensions of the beam, 3. Applied loads, and 4. Supports
7 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 1 Significant of Deflection Methods for Determining Beam Deflections Three methods are commonly used to find beam deflections: 1) The double integration method, ) The singularity function method, and 3) The superposition method CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 13 Beam Deflection The Differential Equation y of the Elastic Curve for a Beam d y EI = M d ( ) (1) E = modulus of elsticity for the material I = moment of inertia about the neutral ais of cross section M() = bending moment along the beam as a function of
8 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 14 Beam Deflection The Differential Equation of the Elastic Curve for a Beam (cont d) Relationship between bending moment and curvature for pure bending remains valid for general transverse loadings. 1 M ( ) = ρ EI Cantilever beam subjected to concentrated load at the free end, 1 P = ρ EI CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 15 Beam Deflection The Differential Equation of the Elastic Curve for a Beam (cont d) From elementary calculus, simplified for beam parameters, d y 1 d y = d ρ 3 dy d 1 + Substituting and integrating, d 1 d y EI = EI = M ( ) ρ d dy EIθ EI = M d 0 EI y = d M 0 0 ( ) d + C1 ( ) d + C1 + C
9 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 16 Beam Deflection Sign Convention y y M  negative M  positive d y negative d y d negative d Figure 3. Elastic Curve CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 17 Beam Deflection Sign Convention y M M L.H.F R.H.F V V (a) Positive Shear & Moment M V Figure 4 V (b) Positive Shear (clockwise) (c) Positive Moment (concave upward) M
10 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 18 Beam Deflection by Integration Eample Boundary Conditions y y Figure 5 y (a) Slope = 0 at = 0 Deflection = 0 at = 0 (b) Slope at L/ = 0 Deflection = 0 at = 0, and L y (c) Slope at rollers? Deflection at rollers = 0 (d) Slope = 0 at =0 Deflection = 0 at = 0 and = L CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 19 Beam Deflection by Integration Eample 1 A beam is loaded and supported as shown in the figure. a) Derive the equation of the elastic curve in terms of P, L,, E, and I. b) Determine the slope at the left end of the beam. c) Determine the deflection at = L/.
11 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 0 Beam Deflection by Integration Eample 1 (cont d) y P A B L L FBD P P R A = P R A = CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 1 Beam Deflection by Integration Eample 1 (cont d) P R A = y A y s V P M P + M S = 0; M + = 0 P M = for 0 L / (a) P R A = A L/ M s V M P L = P for L / L (b)
12 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. Beam Deflection by Integration Eample 1 (cont d) Boundary conditions: θ = 0 at = L/ (from symmetry) y = 0 at = 0 and = L Using Eqs 1 and a: d y P EI = M ( ) = d dy P EI = EIθ = M ( ) d d = P P EIθ = + C1 = + C1 4 (c) CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 3 Beam Deflection by Integration Eample 1 (cont d) Epression for the deflection y can be found by integrating Eq. c: P EIy = EIθd = 4 3 P EIy = + C1 + C 4 3 P 3 EIy = + C1 + C 1 + C1 (d)
13 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 4 Beam Deflection by Integration Eample 1 (cont d) The objective now is to evaluate the constants of integrations C 1 and C : EIθ ( L / ) = 0 P 4 P L + C1 = 0 C PL C1 = 16 (e) = 0 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 5 Beam Deflection by Integration Eample 1 (cont d) y( 0) = 0 P 3 + C1 + C 1 C = 0 P = 0 1 (f) ( 0) + C ( 0) = 0 (a)the equation of elastic curve from Eq. d P 3 EIy = + C1 + C 1 1 P 3 PL y = EI C 0 (g)
14 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 6 Beam Deflection by Integration Eample 1 (cont d) (b) Slope at the left end of the beam: From Eq. c, the slope is given by P P PL EIθ = + C1 = P PL θ = EI 4 16 Therefore, θ A =θ 1 P EI 4 ( 0) = ( 0) PL PL = CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 7 Beam Deflection by Integration Eample 1 (cont d) (c) Deflection at = L/: From Eq. g of the elastic curve: 1 P y = EI 1 y ( L / ) 3 PL 16 1 P L = EI 1 3 PL = 48EI 3 PL 16 L
15 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 8 Beam Deflection by Superposition and Tables The slope or deflection of a beam is the sum of the slopes or deflections produced by the individual loads. The superposition method provides a means of quickly solving a wide range of more complicated problems by various combinations of known results. CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 9 Beam Deflection by Superposition and Tables To facilitate the task of designers or practicing engineers, most structural and mechanical handbooks include tables giving the deflections and slopes of beams for various loadings and types of support. Such a table can be found in your tetbook (Table 8.3) and provided herein in the net few viewgraphs in Table 1.
16 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 30 Beam Deflection by Superposition and Tables Slopes and Deflection Tables Table 1a (Beer and Johnston 199) CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 31 Beam Deflection by Superposition and Tables Slopes and Deflection Tables Table 1b (Beer and Johnston 199)
17 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 3 Beam Deflection by Superposition and Tables Slopes and Deflection Tables Table 1c (Beer and Johnston 199) CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 33 The loaddeflection relationship of a reinforced concrete beam is basically trilinear, as shown in Figure 6. It is composed of three regions prior to rupture: Region I Region II Region III
18 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 34 Load I II III Deflection Figure 6. Beamdeflection relationship, Region I, precracking stage; region II, postcracking stage; region III, postserviceability stage (steel yields). CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 35 Region I: precracking stage, where a structural member is crackfree. Region II: postcracking stage, where the structural member develops acceptable controlled cracking both in distribution and width. Region III: postserviceability cracking stage, where the stress in the tension reinforcement reaches the limit state of yielding.
19 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 36 Precracking Stage: Region I The maimum tensile stress is less than its tensile strength in fleure, that is less than the modulus of rupture f r of concrete. The fleural stiffness EI can be estimated using the Young s modulus of concrete and the uncracked reinforced concrete crosssection. The loaddeflection behavior depends on the stressstrain relationship of the concrete. CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 37 Precracking Stage: Region I (cont d) The value of E c can be estimated using the ACI empirical epression as was discussed in Chapter 3: or E = 33w f c 1.5 c c (3a) E c = 57,000 f c for normal weight concrete (3b)
20 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 38 Precracking Stage: Region I (cont d) The precracking region stops at the initiation of the first fleural crack when the concrete stress reaches its modulus of rupture f r. The value of f r for normalweight concrete is f =. 5 7 (3c) r f c For all lightweight concrete, multiply the value of f r by 0.75 For sandlightweight concrete, multiply the value of f r by 0.85 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 39 Precracking Stage: Region I (cont d) Estimation of the moment of inertia I in this region: Basically there are two approaches: 1. Gross section (simplified): where I g is calculated neglecting the presence of any reinforcing steel.. Transformed section (more accurate): where I gt is calculated taking into account the additional stiffness contributed by the steel reinforcement. I g = moment of inertia of the gross cross section I gt = moment of inertia of the gross cross section, including steel reinforcement stiffness
21 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 40 Precracking Stage: Region I (cont d) Estimation of the moment of inertia I in this region: The moment of inertia I g for a rectangular section can be computed as 3 bh I g = (4a) 1 And the corresponding cracking moment M cr is M cr I g f = y t r I g f = h Note that y t = h/ for rectangular section r (4b) CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 41 Precracking Stage: Region I (cont d) Estimation of the moment of inertia I in this region: Figure 7 h b d Neglect the stiffness provided by steel M cr 3 bh I g = 1 I g f = y t r I g f = h r
22 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 4 Precracking Stage: Region I (cont d) Estimation of the moment of inertia I in this region: The calculation of the moment of inertia I gt for a rectangular section in this case is dependent on the location of the neutral ais y of the transformed section as shown in Figure 8 The value of y for a rectangular section can be computed by ( bh / )( n 1) Asd y = (5) bh + ( n 1) A s Note that n = E s /E c = modular ratio CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 43 Precracking Stage: Region I (cont d) Estimation of the moment of inertia I in this region: ( bh / )( n 1) Asd y = bh + ( n 1) A s Figure 8 b Es b h d n = E c y C.G na s y t d Do not neglect the stiffness provided by steel Transformed Section
23 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 44 Precracking Stage: Region I (cont d) Estimation of the moment of inertia I in this region: Once I gt has been computed based on the location of the center of gravity, the cracking moment can be estimated from the fleure formula. The corresponding cracking moment M cr is M = cr I gt y t f r (6) CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 45 Postcracking Stage: Region II The precracking region ends at the initiation of the first crack and moves into region II. Most beams lie in this region at service loads. Cracks are wider and deeper at midspan. At limit state of service load cracking, the contribution of tensionzone concrete to fleural stiffness is neglected (see Figure 9). The moment of inertia of the cracked section is designated I cr.
24 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 46 Postcracking Stage: Region II Figure 9 b Stresses Elastic and Section Cracked ε c ( comp. ) Reinforced Concrete Beam f c ( comp. ) h d N.A. ε s ( tens. ) f s ( tens. ) Tensile stresses of concrete will be eceeded. Concrete will crack (hairline crack), and steel bars will resist tensile stresses. This will occur at approimately 0.5 f. c CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 47 Postcracking Stage: Region II (cont d) Calculation of the moment of inertia I cr in this region: The moment of inertia I cr for a rectangular section can be computed as 3 bc I ( ) cr = + nas d c 3 (7) Where the value of the neutral ais c can be computed from the following quadratic equation: 1 bc + nas c nas d = 0 (8)
25 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 48 Postcracking Stage: Region II (cont d) Calculation of the moment of inertia I cr in this region: The neutral ais for a concrete beam is found by solving the quadratic equation: b 1 bc + na c na d b = 0 s s (8) d d  c c C 1 n = E E s c n A s CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 49 Postserviceability Cracking Stage and Limit State of Deflection Behavior at Failure: Region III The loaddeflection diagram is considerably flatter in this region due to substantial loss in stiffness of the section. Etensive cracking takes place. The beam is considered at this stage to have structurally failed by yielding of the tension steel, and continues to deflect without additional loading.
26 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 50 Postserviceability Cracking Stage and Limit State of Deflection Behavior at Failure: Region III The cracks continue to open, and the neutral ais continues to rise upward until total crushing of the concrete when rupture occurs. Postyield deflection and limit deflection at failure are not of major significant in design and hence are not being discussed in any detail, however, it is important to recognize the reserve deflection capacity as a measure of ductility in structures. CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 51 Concept of Effective Moment of Inertia I e In the case of Region II, in reality only of the beam crosssection is cracked. As seen from Figure 9, the uncracked segments below the neutral ais along the beam span possess some degree of stiffness, which contributes to overall beam rigidity. The actual stiffness lies between: or E c I g and E I g and I cr c I cr
27 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 5 Concept of Effective Moment of Inertia I e Generally, as the load approaches the steel yield load level, the stiffness value approaches E c I cr. The ACI Code recommends that deflection be calculated using an effective moment of inertia, I e, where I > I > I g e Once the effective moment of inertia is determined, the member deflection may be calculated by using standard deflection formulas. cr CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 53 Immediate Deflection Immediate deflection is the deflection that occurs as soon as load is applied on the member. The ACI Code, Section , states that this deflection may be calculated using a concrete modulus of elasticity E c as given by Eq. 3, and an effective moment on inertia I e as given by the following equations (Eqs. 9 and 10):
28 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 54 Immediate Deflection Effective Moment of Inertia I e M = M cr a 3 I g M + 1 M cr a 3 I cr I g (9) ACI (98) or I e = I cr M + M cr a 3 ( I g Icr ) I g (10) CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 55 Immediate Deflection Effective Moment of Inertia I e = effective moment of inertia I cr = moment of inertia of the cracked section transformed to concrete I g = moment of inertia of the gross (uncracked) concrete cross section about the centroidal ais, either neglecting or not neglecting steel M a = maimum moment in the member at the stage for which the deflection is being computed M cr = moment that would initially crack the cross section computed from fri g M cr = ACI (99) Where yt f r = modulus of rupture for concrete as given by Eq. 3c y t = distance from the neutral ais of the uncracked cross section (neglecting steel) to the etreme tension fiber
29 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 56 LongTerm Deflection In addition to deflections that occur immediately, reinforced concrete members are subject to added deflections that occur gradually over long periods. These additional deflections are due mainly to creep and shrinkage and may eventually become ecessive. The longterm deflections are computed based on: CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 57 LongTerm Deflection 1. the amount of sustained dead and live load, and,. The amount of compression reinforcement in the beam. The additional longterm deflections may be estimated as follows: LT = λ i T = 1+ 50ρ i (11)
30 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 58 LongTerm Deflection Where LT = additional longterm deflection i = immediate deflection due to sustained loads λ = a multiplier for additional longterm deflection [ACI Eq. (911)] ρ = nonprestressed compression reinforcement ratio ( A s / bd ) T = timedependent factor for sustained loads: 5 years or more.0 1 months months 1. 3 months 1.0 CHAPTER 8a. SERVICEABILITY OF BEAMS AND ONEWAY SLABS Slide No. 59 LongTerm Deflection Some judgment will be required in determining just what portion of the live loads should be considered sustained. In a residential applications, 0% sustained live load might be a logical estimate, whereas in storage facilities, 100% sustained load would be reasonable.
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