Directly linked to the automated functionalities of the line of integration using finite elements, this application allows the user to operate in a. Design methodology design methodology simplified method table 3. The construction and design of concrete slabs on grade. A design procedure for carrying out detail design of slab may be list out as follows. Feb 04, 2018 thus for main reinforcement up to 12 mm diameter bar and for mild exposure, the nominal cover is 15 mm b. Frp reinforced concrete slabs a comparative design study. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. Bm and sf coefficients for flat slab or 3 or more equal spans outer support column wall near centre of 1st span first interior span centre of interior span interior span moment 0. Pdf optimum design of a reinforced concrete ribbed slab. The slab thickness depends on the type of loads on the floor slab. Concrete slab rest ing on grade cont aining steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars.
Transverse reinforcement at laps bars in tension ec2. Check the applicable joist dimensional limitations as follows. Systems with slabs and supporting beams, joists or columns typically have multiple. The purpose of the steel fibers is to limit the width of any cracks that occur between the joints and to enhance aggregate interlock at the joints. Manual for design and detailing of reinforced concrete to september 20 the code of practice for structural use of concrete 20 contents 1.
The technique investigated in this study 6 involves the substitution of traditional steel reinforcement with frp. For concrete slab design, the slab dimensions and the size and spaci ng of reinforcement shall be selected to satisfy the equation below for all appropriate limit states. Analysis to determine the maximum moments, thrusts and shears for design design of sections and reinforcement arrangements for slabs, beams, columns and walls using the results from 3 production of arrangement and detail drawings and bar schedules this structural design process has been carried out under use of bs8110 design code of practice. Generally, thickness of slab is sufficient to resist shear stresses, so there is no need for extra shear reinforcement. Twoway slab analysis and design aci 318 states that a slab system shall be designed by any procedure satisfying equilibrium and geometric compatibility, provided that strength and serviceability criteria are satisfied. Reinforced concrete slab design and detailing guide is456. Of course, if the reinforcing requirement is still extremely large, try deepening all or some of the beams to lessen the reinforcing required. Reinforced concrete design 1 design of slab examples and. Design of oneway slabs the structural action of a oneway slab may be visualized in terms of the deformed shape of the loaded surface. The assistant generates column strips and middle strips that are adapted to the geometries of the bidirectional span of the slab. The foundation of the structure is a conventionally reinforced mat slab supported directly on soil. Accordingly, main reinforcement is required in the two directions. Slab reinforcement details how to study structural. This successful field implementation of this technology, along with the compelling evidence presented on the durability of gfrp reinforcement in different exposed environments mufti et al.
Th e floor slab design procedure presented the maximum allowable stationary live load is lim. Thickness of the slab is decided based on span to depth ratio specified in is4562000. The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340, design. Tm 580912 concrete floor slabs on grade subjected to. Also it should be positioned at the outer sections of the lap as shown. With some limitations, reinforcement for slabs can be sized using the subgrade drag theory in order to increase the spacing of control or construction joints. The floor slab design procedure presented the maximum allowable stationary live load is lim herein is based on limiting the critical tensile stresses ited by both the positive bending moment stress produced within the slab by the vehicle loading, as under the load and the negative bending moment. The reinforcement in either direction in slab shall not be less than 0.
Chapter 2 should be followed except for minimum shear reinforcement. Bending will take place in the two directions in a dishlike form. Assume partitions cannot be damaged by deflections. Pdf design of reinforced concrete flat slab with drop. Reinforced concrete slab design guidelinesa effective span of slab. Sep 03, 2011 chapter 2 should be followed except for minimum shear reinforcement. What is two way slab design reinforcement details green.
Reinforced concrete design 1 design of slab examples. We do not need to define any beam shapes since we are using a reinforced concrete slab. This successful field implementation of this technology, along with the compelling evidence presented on the durability of gfrp reinforcement in different exposed environments mufti. Structural design of a reinforced concrete residential building.
The reinforcement for the column strip was design for the direction from easttowest only. Determine the area of steel required in the slab at critical sections for column and middle strips. Direct design method ddm for slab systems with or without beams loaded only. Gfrp reinforcing bars were used as the main reinforcement in the oneway slabs in a demonstration area about 1,000 m2. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Select reinforcing bars for the slab and concentrate bars near the column, if necessary 5. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. The quality of a completed floor slab is dependent on. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures.
The plans of the the podium slab and the parking ground level are shown in figs. The slab has to carry a distributed permanent action of 1. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. The slabs are designed according to bending moment, shear and torsion. Safis reinforced concrete slab design assistant becomes the ultimate tool for slab design in a simple and intuitive way. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two opposite short edges. Reinforcement detailing of reinforced concrete slabs. In case of twoway slabs, the reinforcement against bending is estimated for both short. Step 3 cover to reinforcement determine cover required to reinforcement as per tables 11. Flat slab analysis, design and detailing pdf civil engineering. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below.
Slab design in case of oneway slabs, the reinforcement against bending is estimated only for short direction. Aci 360, design of slabs ongrade, refers to this as a type b slab. In general, the design of slab become more simpler because compression reinforcement are often not required and the shear stress are usually low except when there are heavy concentrated load. The service live load is 116 psf and 4000 psi concrete is specified for use with steel of yield stress equal to 60,000 psi.
Design beams if any, using procedures you learned in civl 45. In this example, the latter option will be used to achieve better understanding for the design of twoway joist slab often called twoway ribbed slab or waffle slab. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is. Design of one way and two way slabs, design of staircases. Background 3 different applications of fibre reinforced polymers frps are available in the civil engineering 4 field, with the use of frp strips or bars to externally repair or strengthen structural elements 5 being the most wellknown and common technique. In calculating the actual i of the slab, the sections shown in figure 11 should be used. Manual for design and detailing of reinforced concrete to the. Following are the rcc slab design and detailing guidelines. The first reinforced concrete design manual formerly titled aci design handbook was developed in.
A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. Ce 433, reinforced concrete design summer 20 example slab design 1 2 material properties geometry compressive strength of concrete fc 5,000 psi span length of slab beam spacing l 18 ft center to center coefficient for depth of stress block 1 0. For the design of slabs onground with fiber reinforcement, aci 360r chapter 11 provides detailed information and calculations. The 6 slab is supported on soil with a subgrade modulus of 100 kcf. Slab reinforcement details how to study structural drawing. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab.
Design of slab examples and tutorials by sharifah maszura syed mohsin. Pdf design of reinforced concrete flat slab with drop panel. The reinforced concrete slab design assistant allows the user to quickly generate the design strips of a concrete slab. Design of reinforced concrete structures ii twoway slabs 1 1. Tm 580912 concrete floor slabs on grade subjected to heavy. Several additional slab ongrade design methods are outlined in the american concrete institute committee 360s guide to design of slabs onground 2010. References shown following section titles are to the aashto lrfd. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints.
Fip 8 design and specification of fiberreinforced concrete. The maximum practical reinforcement ratio is, according to eq. Reinforced concrete buildings series design booklet rcb2. The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2.
Flexural reinforcement ratio is calculated from the following equation. Plan view of floor system assume partitions will not be damaged by deflections. In most cases, the slab thickness is designed as an unreinforced concrete section. Design of reinforced concrete slabs by the end of this session, you will be able to.
Distinction of twosystems from oneway systems is given by aci 31814 r8. Floor slab design floors are designed as slabs on grade. Manual for the design of reinforced concrete building. Determining slab thickness starts with the purpose of the slab, its use and its loads, in addition to applicable standards. The design variables are taken as the effective depth of the slab, ribs width, the spacing between ribs, the top slab thickness, the area of flexural reinforcement at the moment critical sections. A reinforced concrete slab case is adopted as a test to show that the proposed methodology is capable of producing optimal tradeoff solutions in slab reinforcement detailing design, resulting in. Twoway joist concrete slab floor waffle slab system. Moduleiii design of short and long columns with axial and eccentric loading, design of isolated column footing. Pdf slabs are the flooring systems of most structures including office. Design of reinforced concrete structures ii twoway slabs. Ce 433, summer 20 slab design example 1 5 design a one. Part of the gse concrete design, it allows the user to quickly and efficiently generate design strips for any concrete slab. Design the slab, following the provisions of the aci code.
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