Two-way Ribbed Slab Design Example
Wsd 20 psf wll 80 psf fc 4000 psi fy 60000 psi span. A Designed example for ribbed slab 1st floor.
Applicability Of Code Design Methods To Rc Slabs On Secondary Beams Part I Mathematical Modeling Sciencedirect
Both one way and two way ribbed slab systems are based on joists or ribs carrying a topping slab the only difference is how are the ribs arranged.
Two-way ribbed slab design example. RIBBED JOIST HOLLOW POT WAFFLE SLAB DESIGN TO BS 8110 MrAsish Seeboo 8 12 WAFFLE SLAB DESIGN 121 INTRODUCTION Similar to one-way slab it is seen that the weight of a solid two-way slab can be appreciably reduced by eliminating portions of concrete from the tensile zones without affecting the structural integrity of the the slab. This condition occur when the slabs are connected monolithically with support. Choose layout and type of slab.
The dome-shaped forms create a matrix of voids surrounded by orthogonal ribbing producing a two-way configuration very suitable for. Depending on the boundary condition and the properties of the slabs methods of finding bending moment is expressed in the BS 8110 Part 01 as follows. Moment at short.
X 18 in edge beam dimensions 14 in. F c 3 ksi f y 50 ksi. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need to be taken into account to reduce the complexity of calculations needed when using exact geometry of the two-way joists.
Concrete is cast between those spacing to make those ribs and in this way the slab also cast and the slab becomes the flange of T beam. Therefore Span Ratio m 1319 068. It has got detailed worked example of all cocncete elements including ribbed and waffle slabs.
Construction in a school. Basic Steps in Two-way Slab Design 1. Ribbed slab is a type of reinforced concrete slabs in which some of the volume of concrete in the tension zone is removed and replaced with hollow blocks or left as voids.
21 Slab 1 slab 3 and slab 4 1. Calculations The floor system consists of solid slabs and beams in two directions supported on 20-in. In one way ribbed slab system the joists or ribs run usually in the shorter direction.
X 27 in interior beam dimensions 14 in. Design of Two-way Slabs Example 12 Use i WSD ii USD to design the two-way slab shown below carrying floor finish 30 psf random wall 50 psf and live load 60 psf Given. Clear area for each slab is 13 19.
Transcribed image text. The characteristic dead load including self-weight and finishes is 45 kNm² and the characteristic imposed load is 3 kNm² Grade 35 concrete and grade 500 steel are used. Determine moments at critical sections in each direction normally the negative moments at supports and positive moment near mid-span.
Design the slab following the provisions of the ACI code. The best book to refer to is Reinforced Concrete Design to Eurocode by Bill Mosley. The effective section is shown in Figure 217.
Also check if thickness is adequate for shear. Choose Design method Equivalent Frame Method- use elastic frame analysis to. One way spanning slabs.
Two way slabs 82 One-way Slabs In this section two types will be discussed one-way solid slabs and one-way ribbed slabs. Download to read offline. The slab is two way ribbed slab of 450mm thickness.
Choose slab thickness to control deflection. 33 l h h. Slab ll a b m Case C a D C L C C C L C.
Columns are 30cm X 30cm Equivalent partitions load250 Kgm2 Live Load 400Kgm2 280 kgcm 2 4200 Kgcm 2 slab thickness 16cm. This gives you complete waffle slab design with rebar detailing and schedules. Waffle slabs are reinforced concrete slabs that are normally employed for large-span construction.
One way and two way slabs one way slabs transfer the imposed loads in one direction only. My Graduation Project with my mate Ghassan Faris a Two Way ribbed slab of clear span of 18 x 25 m was designed by SAFE 2014 the building is 3-storey concrete. Distribute moments transverse at critical sections to column and middle-strip and if.
Example 23 - Design of Ribbed Slab The ribbed floor is constructed without permanent blocks. Fc 25 Mpa fy 420 Mpa h 320 mm d 280 mm bw 150 mm bf 550 mm According to PROKON analysis. Design of Slab Examples and Tutorials by Sharifah Maszura Syed Mohsin Example 2.
The design bending moment of two-way restrained slab can be calculated as follows. The four slabs are modeled using Sap2000 software as three dimensional structures. Two-Way Slabs 10 Example 1.
Continuous one way slab Near middle of end span M 0075Fl 0075 x 524 x 4 1572 kNmm K Mbd2f ck 1572 x 106 1000 x 1102 x 25 0052 K bal 0167 Compression reinforcement is not required z d 05 025𝐾1134 095d 095d A s M087f yk z. Two-way Ribbed Slab System Waffle System The system was designed to decrease the weight of traditional full-concrete slabs. The basic design procedure of a two-way slab system has five steps.
The first stage of the design is finding the bending moment of the slab panels. Two-way joist slab often called two-way ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. Local example for one way ribbed slab 21 331 design steps.
The width of rib is 150mm. Example - Slab Slab thickness from table 95 c for fy 60 ksi and no edge beams for m 0 no beams n min min 33 12 in. 821 One-way Solid Slabs 8211 Minimum Thickness.
The ratio of the total costs was found to be within the range 110 -212 and the cost ratio decreases as the span length increases. Since the joists act as T beams the fl. Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height 12 ft column cross-sectional dimensions 18 in.
Two-Way Restrained Slab If the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as two-way restrained slab. It is continuous over several equal spans of 55 m. The basic data that is used for analysis of these slabs are.
Slab design is comparatively easy when compared with the design of other elements. The design concept of waffle slabs is similar to that of ribbed slabs with the difference being that waffle slabs have ribs spanning in both directions and the. This reduction in the volume of concrete in the tension zone below the neutral axis is based on the assumption that the tensile strength.
The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi. To control deflection aci code 9521 specifies minimum thickness values for one way solid slabs shown in table 81. A two way slab reinforced by ribs in two.
CHAPTER EIGHT DESIGN OF ONE-WAY SLABS 3 Figure 82. They can be described as the equivalent of 2-way spanning solid slabs but with ribbed slab system spanning in both directions. Type of slab is strongly affected by architectural and construction considerations.
This is a must have book for structural engineers. Structural Design of Ribbed Slabs. For being both ends continuous minimum slab thickness L28 15 x.
Answer 1 of 3. For the given data design strip 1-2-3-4 of the two way slab for flexure.
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