REINFORCED CONCRETE STRUCTURE COURSE STR 302A CL0SED BOOK EXAM THIRD YEAR CIVIL FIRST TERM YEAR TYPES OF SLABS
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1 REINFORCED CONCRETE STRUCTURE COURSE STR 302A CL0SED BOOK EXAM THIRD YEAR CIVIL FIRST TERM YEAR COURSE CONTENTS : DESIGN OF DIFFERENT SLABS TYPES OF SLABS - Paneled Beam Slab - Stairs - Solid Slab - Hollow Block Slab - Flat Slab GRADES 20% 10% TUTORIAL & ASSIGNMENT MED TERMEXAM FINAL EXAM 70% TOTAL 100% ناحتملاا ىف ةیرورض( میمصتلا تادعاسم لامحلاا دوك ةناسرخلا دوك) PREPARED BY فورعم وھ امك حرشلا صصح ماظن PROF. DR. MAGDY KASSEM SOLVED EXAMPLES
2 3 rd Year Civil 1 st Term Tutorial Lecture Date No Solid Slabs Solid Slabs Solid Slabs Solid Slabs Quiz + Grading S slabs Solid Slabs Paneled Beams Paneled Beams Quiz + Grading P.B H.B Slabs H.B Slabs H.B Slabs كرابملا ىحضلا ا دیع (26-29) ىساردلا لصفلا فصن ناحتمإ H.B Slabs H.B Slabs Quiz + Grading H.B Flat Slabs Flat Slabs Flat Slabs Flat Slabs Flat Slabs Quiz + Grading F.S Stairs Stairs Stairs Quiz + Grading Stairs
3 One-Way Ribbed or Hollow-Block Slab System If the ribs are arranged in one direction, loads are transferred in one direction; the slab is called one-way ribbed (joist) slab, see Figures 3 and 4. The ribs are supported on girders that rest on columns. Structural Plan
4 Figure 3: One-Way hollow-block slab system Figure 4: Isometric of one-way hollow-block slab system
5 Two-Way Ribbed or Hollow-Block Slab System If ribs are arranged in two directions, loads are transferred in two directions; the slab is called two-way ribbed (joist) slab. Different systems can be provided of two-way ribbed slab as follows, see Figure 5. i. Two-way rib system with permanent fillers between ribs that produce flat slab is called two-way hollow-block (joist) slab system, see Figure 5a1 and 5a2. Figure 5a-1: Structural plan of two-way hollow-block slab
6 Figure 5a-2: Isometric of two-way hollow-block slab system ii. Two-way rib system with voids between the ribs that obtained by using special removable forms (pans), normally square in shape, is called two-way ribbed (joist)slab system, Figure 5b. Figure 5b: Structural plan of two-way ribbed slab
7 iii. Two-way rib system, with voids between the ribs, has the ribs continuing in both directions without supporting beams and resting directly on columns through solid panels above the columns. This type is called a waffle slab system, Figure 5c. Figure 5c: Interior panel of waffle slab system
8 Reinforcement details and blocks arrangement Figure 10 shows the reinforcement details of one-way hollow-block slab systems. Sec. (1-1)
9 Sec. (2-2) Sec. (3-3) Figure 10: Reinforcement details of one-way hollow-block slab system on plan and in cross-sections
10 Reinforcement details and blocks arrangement The arrangement of hollow-block and shape of reinforcement details of two-way slab systems are shown in Figure 12. Figure 12: Plan of reinforcement details of two-way simply supported hollow-block slab system
11 Paneled Beam Slab Design of Edge Beams The floor "mother" slab a b is divided into small slabs s 1, s 2, s 3 by a system of paneled beams. Each of the baby slabs s 1, s 2, s 3.. is designed as a solid (or hollow blacks) slab. For the designer of edge beams, consider the whole slab a b to be carried by the four beams at the four edges: For analysis of edge beams, there are two approaches: 1. distribute load on edge beams from slab as if there is no paneled beams inside, i.e. assuming fracture lines at 45 o from corners. this approach becomes more appropriate as the number of paneled beams not supported directly on columns increases.
12 2. Transfer reactions of panelled beams to edge beams and solve the edge beam subjected to: 1. reaction of panelled beams 2. slab loads of slabs adjacent to the edge beam. this approach becomes more appropriate than the former one as the number of panelled beams supported directly on column increases.
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14 Flat Slabs Introduction Flat slabs are beamless slabs resting directly on columns. They may have drop panels and/ or columns may have column capitals as shown in Figure (1). They may be solid or ribbed in two directions with or without hollow blocks. Generally speaking, flat slabs behave like two continuous orthogonal frame system. Accordingly, the bigger moments occur in the direction of bigger spans. This behavior is different than twoway solid slabs supported on all four sides. Flat slabs Roofs Solid Slabs Flat Slabs
15 Flat Slabs without drop Panel B ( L.L 500 kg/cm2) A A t s B Section A - A Flat slabs with drop Panel ( L.L 1000 kg/cm2) A A t s (drop panel) t s Section A - A
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17 Flat Slabs
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19 o Stairs Slab and Beam Type Slab Type Cantilever Type Cantilever Type
20 Solid Slabs ne Way Slabs Effective Span Loads Minimum Thickness Bending Moments Reinforcement Supports O Two Way Slabs General Effective Spans Minimum Thickness Simplified Method for Calculating B.M. in Two Way Slabs Reinforcement Calculations Practical Cases Concluding Remarks
21 Waffled slabs (ribbed slabs without hollow blocks, spacing about 1 m each direction) Solid Slabs Hollow Block Slabs Flat Slabs Waffle Slabs Paneled Beams Slabs Loads Spans Design Requirements Ly Structural system must be chosen to satisfy economic requirements according to these factors Lx
22 One-way slabs Thickness t = b / 30 = b / 35 = b / 40 = b / 10 Two-way slabs Thickness t = b / 35 = b / 40 = b / 45
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24 One Way Slabs * Slabs supported on two opposite sides only * Slabs supported on four sides with effective length (b e ) greater than twice the effective length (ae) * One way slabs are to be calculated based on strips of unit length in the short direction
25 Effective Span i) L e for simple or continues slab is the larger of : or or c s 1.05 L c L e < L ii) L e for cantilever slabs is the smaller of : L or L c + t s iii) Continuous or simply supported slabs supported on beams with b > 0.2 L c can be designed as fixed at support, and every span can be calculated separately
26 Loads * Total load on slab: W = W D + W L * Dead loads: W D = slab self weight + flooring = t s (mm) ( ) kn/m 2 * Live loads: W L : depends on the function of the building. * If designing using Limit State Design Method, use W u = 1.4 W D W L L.L IS TO BE TAKEN FROM FROM CODE ACCORDING TO THE FUNCTION OF THE BUILDING Supports The width of the support for slab is the larger of : ts or 150 mm..for brick walls 100 mm for R.C. beams
27 Minimum Thickness 1. Slab thickness shall not be less than the absolute minimum of: t min = L e /30 simply supported at both ends t min = L e /35 continuous at one end tmin = Le/40 continuous at both ends Where L e is the effective span as defined above 2. For ordinary buildings and cast-in-situ slabs: t s > 80 mm under static loads t s > 120 mm under dynamic loads 3. Smaller thicknesses can be used in pre-cast slabs. 4. Minimum thickness to satisfy the deflection limits in ordinary buildings (i.e. no need to check deflection if the slab thickness is not less than the values indicated) is as follows: Table (4-10) ECCS Span / depth ratio; L/d * Table (4-10) applies only if the following conditions are satisfied: 1. ordinary buildings 2. spans 10 m 3. uniform, but not heavy, live load, (live load twice dead load)
28 Bending Moments N.B. * In designing with Ultimate Limit States Design Method: w = w ultimate * In designing with Working Stress Design Method: w = w working
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32 Bending moment of slab According to ECCS , the bending moment of equal span ribs or with maximum difference not greater than 20% of the larger span is as follows: M = wl 2 /k, where k is as follows: - Simple span - Two spans - More than two spans Reinforcement The main reinforcement of a slab shall satisfy the requirements of equilibrium: C = T M u = C. y ct = T. y ct cover = mm The reinforcement shall also be arranged along the direction of short span.normal to the main reinforcement, shrinkage and temperature (distributes) reinforcement are provided.
33 1. Minimum main reinforcement: * For mild steel : * For high strength steel : The main reinforcement should be arranged to cover all the tension zones and extend beyond the end of these zones enough to develop the necessary anchorage.
34 One way slab reinforcement details. 3. Maximum spacing between bars of main steel is 2 t s and < 200 mm. For ts < 100 mm, spacing of 200 mm may be used. 4. A minimum of 1/3 of the main steel must be extended to the supports. 5. Distributors with minimum of 4 bars/m. 6. Minimum diameter for straight bars is 6 mm. Minimum diameter for bent bars is 8 mm. Bars of smaller diameters may be used for welded wire mesh and pre-cast concrete. 7. When using steel mesh, all conditions above must be satisfied.
35 8. For slabs with thicknesses 160 mm, top mesh must be provided. The top mesh must be taken 20% of the bottom reinforcement, but not less than 5Ø8 /m' for mild steel or 5Ø6 /m' for high strength steel. Choice of Slab Reinforcement 1. Chosen bars diameters: - mild steel (24/35) 8, 10, 13mm - high grade steel(36/52) 8, 10, 12mm 2. Half of the steel is straight bars & the other half is bent bars 3. Min. number of bars (in 1.0 m) is 5 and max. number is 10, the common number is 6 8 ( 6 10/m ) 4. We can use bars of the same diameters or two successive diameters ( /m ) and the big diam is the bent bar 5. The number of bars should be the same in the same direction 6. Steel in long direction (secondary) 0.25 steel in short direction (main) 7. Rules of bent bars in beams ( L / 7, L / 5, L / 4) are applied for slabs
36 Practical Cases 1- In one way slab, difference between adjacent spans is greater than 20%: - Solve continuous strip (1.0 m width) 2- One way slab adjacent to two way slab: - Design for the larger ve moment at the common support 3- Washrooms: - Drop slab of the washrooms by ( ) mm. Hence slabs become not continuous with adjacent slab of the floor. 4- Slab with openings: - For small openings less than spacing between bars; do nothing. - For small openings greater than spacing between bars; use additional reinforcement.
37 * For large openings, use more accurate analysis.
38 Two Way Slabs Two-way slabs Thickness t = b / 35 = b / 40 = b / 45
39 Two Way Slabs - A small element of medium thick plate is shown in figure:
40 The following equation gives the basic equilibrium requirement for a medium thick plate: Unlike one way slabs which deform under load into nearly a cylindrical surface, two way slabs bend into a dished surface. This means that at any point, the slab is curved in both directions. The applied distributed load W on the element is carried partly by bending as a beam strip in the x- direction producing M x, partly by bending of the strip in the y-direction producing M y, and the remainder by interaction between the x and y strips, i.e. by torsion producing M xy. General 1. Rectangular slabs supported on all four sides can be considered as two way slabs if the rectangularity ratio r is smaller than 2, or large than Slabs can be solved according to the elastic theories on condition that the reinforcement resisting ve moments is placed in the right position during casting.. 3. The following method of design is valid only for ordinary buildings with small uniformly distributed live load up to 5 kn/m 2.
41 Loads * Total load on slab: W = W D + W L * Dead loads: W D = slab self weight + flooring = t s (mm) ( ) kn/m 2 * Live loads: W L : depends on the function of the building. * If designing using Limit State Design Method, use W u = 1.4 W D W L L.L IS TO BE TAKEN FROM FROM CODE ACCORDING TO THE FUNCTION OF THE BUILDING Supports The width of the support for slab is the larger of : ts or 150 mm..for brick walls 100 mm for R.C. beams Effective Spans - Refer to one way slabs.
42 Minimum Thickness 1. Slab thickness shall not be less than the absolute minimum of: t min = L e /35 for freely supported slab tmin = Le/40 for slab continuous at one end tmin = Le/45 for continuous or fixed slab Where L e = the smaller effective span of the slab as indicated in one way slabs.
43 Simplified Method for Calculating B.M. in Two Way Slabs Rectangular slabs, monolithically cast with beams and supported on all four sides, with rectangularity ratio r less than 2 and greater than 0.5 subjected to uniform loads can be calculated according to the following simplified method: where: m b = ratio of length between points of inflection for a loaded strip in direction of span b to the effective span b. m a = same but for span a a = the effective span in direction a. b = the effective span in direction b. The values of m a & m b are to be determined from theory of elasticity. For slabs, the following values may be adopted. Knowing the value of r, the load carried in each of the two perpendicular directions can be calculated using the values of α and β of Table (6-1) (ECCS ) Table (6-1) EC 2001 For slabs monolithically cast with beams α = 0.5r 0.15 β = 0.35/r 2
44 The bending moment in continuous slabs can be calculated as follows: where: k = 10 for slabs continuous at one end. = 12 for slabs continuous at both ends. N.B.: negative moment of at exterior support must be considered. For slabs resting on masonry walls, the load distribution factors, α and β are determined according to Table (6-2) ECCS Table (6-2) (ECCS ) For slabs resting on masonry walls * If live load 500 kg/m 2, use Table (6-3) instead of Tables (6-1) and (6-2). Table (6-3) (ECCS ) For solid slabs resting with L.L. 500 kg/m 2
45 Two-way slabs Thickness t = b / 35 = b / 40 = b / 45
46 1. Loadings : * Dead Load (w D ) - concrete weight : 0.12 x 2500 kg/m 2 - flooring kg/m 2 * Live Load (w L ) = according to building type * Total slab load : w s = w D + w L 2. Load distribution according to Code : * distribution factor 1 r 2 * continuity factor m r = m1 * L1 m = 1.00 m2 * L2 m = 0.87 m = 0.76 The loads in each direction are as: For two way slabs w = w s ---- short direction w = w s ---- long direction Using r ---- Get, from Code table (6-1)..page(5) in the curves For one way slabs w = w s w = 0.0
47 3. bending moments in slabs M = M = M = M = w L 2 8 w L 2 10 w L 2 12 w L Design of sections d short = t s 1.5 cm d long = t s 2.5 cm d long d short t
48 Reinforcement The main reinforcement of a slab shall satisfy the requirements of equilibrium : C = T M u = C. y ct = T. y ct cover = mm The reinforcement shall also be arranged along the direction of short span.normal to the main reinforcement, shrinkage and temperature (distributes) reinforcement are provided. 1. Minimum main reinforcement: * For mild steel : * For high strength steel : nd2. The main reinforcement should be arranged to cover all the tension zones a extend beyond the end of these zones enough to develop the necessary anchorage.
49 EACH DIRECTIN OF X AND Y One way slab reinforcement details. 3. Maximum spacing between bars of main steel is 2 t s and < 200 mm. For ts < 100 mm, spacing of 200 mm may be used. 4. A minimum of 1/3 of the main steel must be extended to the supports. 5. Minimum diameter for straight bars is 6 mm. Minimum diameter for bent bars is 8 mm. Bars of smaller diameters may be used for welded wire mesh and pre-cast concrete. 6. When using steel mesh, all conditions above must be satisfied. 7. For slabs with thicknesses 160 mm, top mesh must be provided. The top mesh must be taken 20% of the bottom reinforcement, but not less than 5Ø8 /m' for mild steel or 5Ø6 /m' for high strength steel.
50 Reinforcement 1. Maximum spacing of main reinforcement in the middle zone of the span is 2ts but not more than 200 mm. However, For ts < 100 mm, 5 bars/m may be used. 2. Reinforcement in the secondary direction should not be less than 0.25 of the main reinforcement with minimum of 5 bars/m'. 3. Positive reinforcement adjacent and parallel to a continuous edge may be reduced by 25% for a width of not more than ¼ the shorter span of the panel. 4. For other details, refer to one way slabs.
51 Choice of Slab Reinforcement 1. Chosen bars diameters: - mild steel (24/35) 8, 10, 13mm - high grade steel(36/52) 8, 10, 12mm 2. Half of the steel is straight bars & the other half is bent bars 3. Min. number of bars (in 1.0 m) is 5 and max. number is 10, the common number is 6 8 ( 6 10/m ) 4. We can use bars of the same diameters or two successive diameters ( /m ) and the big diam is the bent bar 5. The number of bars should be the same in the same direction 6. Steel in long direction (secondary) 0.25 steel in short direction (main) 7. Rules of bent bars in beams ( L / 7, L / 5, L / 4) are applied for slabs ANALYSIS AND DESIGN APPROACHE: - TAKING STRIPS IN BOTH DIRECTION X & Y - USING DESIGN TABLES
52 Calculations Calculations may be carried out in a table form as follows: 1. Load distribution 2. Bending moment and reinforcement For each direction (i.e. main and secondary directions) a table in the following form may be used. i) For short direction
53 Slab Reinforcement L / (2.5 10/m) (2.5 10/m) ( L / 7 L / 5 L Slab Reinforcement 1.5 L ( / m ) Main reinforcement ( ) Cantilever Slab Secondary reinforcement ( T & B )
54 Practical Cases 1- In one way slab, difference between adjacent spans is greater than 20%: - Solve continuous strip (1.0 m width) 2- One way slab adjacent to two way slab: - Design for the larger ve moment at the common support 3- Washrooms: - Drop slab of the washrooms by ( ) mm. Hence slabs become not continuous with adjacent slab of the floor. 4- Slab with openings: - For small openings less than spacing between bars; do nothing. - For small openings greater than spacing between bars; use additional reinforcement.
55 * For large openings, use more accurate analysis.
56 Solid Slabs Hollow Block Slabs Flat Slabs Waffle Slabs Paneled Beams Slabs Loads Spans Design Requirements Ly Structural system must be chosen to satisfy economic requirements according to these factors Lx
57 One-way slabs Thickness t = b / 30 = b / 35 = b / 40 = b / 10 Two-way slabs Thickness t = b / 35 = b / 40 = b / 45
58 1. Loadings : * Dead Load (w D ) - concrete weight : 0.12 x 2500 kg/m 2 - flooring kg/m 2 * Live Load (w L ) = according to building type * Total slab load : w s = w D + w L 2. Load distribution according to Code : * distribution factor 1 r 2 * continuity factor m r = m1 * L1 m = 1.00 m2 * L2 m = 0.87 m = 0.76 The loads in each direction are as: For two way slabs w = w s ---- short direction w = w s ---- long direction Using r ---- Get, from Code table (6-1)..page(5) in the curves For one way slabs w = w s w = 0.0
59 3. bending moments in slabs M = M = M = M = w L 2 8 w L 2 10 w L 2 12 w L Design of sections d short = t s 1.5 cm d long = t s 2.5 cm d long d short t
60 Slab l effx w x t/m M x d cm R a s A s chosen /m cm 2 /m 5 8/m S1 3 8/m+3 10/m S2 6 8/m S3 x- direc. 6 8/m 6 10/m S4 S5 3 10/m+3 13/m S6 6 13/m S7 6 10/m S8 Slab l effx w x t/m M y d (cm) R A s cm 2 /m A s chosen /m S /m S /m++3 10/m y- direc. S /m S /m S /m S /m S /m S /m+3 13/m
61 Choice of Slab Reinforcement 1. Chosen bars diameters: - mild steel (24/35) 8, 10, 13mm - high grade steel(36/52) 8, 10, 12mm 2. Half of the steel is straight bars & the other half is bent bars 3. Min. number of bars (in 1.0 m) is 5 and max. number is 10, the common number is 6 8 ( 6 10/m ) 4. We can use bars of the same diameters or two successive diameters ( /m ) and the big diam is the bent bar 5. The number of bars should be the same in the same direction 6. Steel in long direction (secondary) 0.25 steel in short direction (main) 7. Rules of bent bars in beams ( L / 7, L / 5, L / 4) are applied for slabs
62 Slab Reinforcement L / (2.5 10/m) (2.5 10/m) L / 7 L / 5 L
63 Slab Reinforcement 1.5 L ( / m ) Main reinforcement ( ) Cantilever Slab Secondary reinforcement ( T & B )
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65 Final Reinforcement of Slab
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