Structural design of a reinforced concrete residential building. For the design of slabs onground with fiber reinforcement, aci 360r chapter 11 provides detailed information and calculations. What is two way slab design reinforcement details green. Of course, if the reinforcing requirement is still extremely large, try deepening all or some of the beams to lessen the reinforcing required. Determining slab thickness starts with the purpose of the slab, its use and its loads, in addition to applicable standards. Slab reinforcement details how to study structural drawing. Manual for design and detailing of reinforced concrete to the.
Gfrp reinforcing bars were used as the main reinforcement in the oneway slabs in a demonstration area about 1,000 m2. The maximum practical reinforcement ratio is, according to eq. Twoway joist concrete slab floor waffle slab system. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear.
The slabs are designed according to bending moment, shear and torsion. Pdf design of reinforced concrete flat slab with drop panel. Part of the gse concrete design, it allows the user to quickly and efficiently generate design strips for any concrete slab. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two. 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.
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. The reinforced concrete slab design assistant allows the user to quickly generate the design strips of a concrete slab. 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. The slab will be entered later using two different methods, as a cross section and as a schedule based member alternative. 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. Sep 03, 2011 chapter 2 should be followed except for minimum shear reinforcement. In case of twoway slabs, the reinforcement against bending is estimated for both short. Flat slab analysis, design and detailing pdf civil engineering. Pdf slabs are the flooring systems of most structures including office. The reinforcement in either direction in slab shall not be less than 0. Direct design method ddm for slab systems with or without beams loaded only.
Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is. Reinforced concrete buildings series design booklet rcb2. 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. Several additional slab ongrade design methods are outlined in the american concrete institute committee 360s guide to design of slabs onground 2010. The slab has to carry a distributed permanent action of 1. The foundation of the structure is a conventionally reinforced mat slab supported directly on soil. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. The first reinforced concrete design manual formerly titled aci design handbook was developed in. It follows that the design yield strength of reinforcing steel that may be used in a slab designed in accordance with as 36002000 is 400, 450 or 500 mpa.
The 6 slab is supported on soil with a subgrade modulus of 100 kcf. Plan view of floor system assume partitions will not be damaged by deflections. 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. 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. Determine the area of steel required in the slab at critical sections for column and middle strips. Safis reinforced concrete slab design assistant becomes the ultimate tool for slab design in a simple and intuitive way.
Design of reinforced concrete structures ii twoway slabs 1 1. 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. 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. Tm 580912 concrete floor slabs on grade subjected to heavy. Systems with slabs and supporting beams, joists or columns typically have multiple. Concrete slab rest ing on grade cont aining steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Design the slab, following the provisions of the aci code. 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. 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.
Pdf optimum design of a reinforced concrete ribbed slab. In most cases, the slab thickness is designed as an unreinforced concrete section. Design of one way and two way slabs, design of staircases. 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. Assume partitions cannot be damaged by deflections. Also it should be positioned at the outer sections of the lap as shown. Reinforced concrete design 1 design of slab examples and. Design of reinforced concrete structures ii twoway slabs. In calculating the actual i of the slab, the sections shown in figure 11 should be used.
Design of oneway slabs the structural action of a oneway slab may be visualized in terms of the deformed shape of the loaded surface. Floor slab design floors are designed as slabs on grade. 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. Select reinforcing bars for the slab and concentrate bars near the column, if necessary 5. Bending will take place in the two directions in a dishlike form. Manual for design and detailing of reinforced concrete to september 20 the code of practice for structural use of concrete 20 contents 1. A design procedure for carrying out detail design of slab may be list out as follows.
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. Manual for the design of reinforced concrete building. Reinforced concrete slab design and detailing guide is456. Manual for design and detailing of reinforced concrete to. This successful field implementation of this technology, along with the compelling evidence presented on the durability of gfrp reinforcement in different exposed environments mufti. Distinction of twosystems from oneway systems is given by aci 31814 r8.
The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2. 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. Frp reinforced concrete slabs a comparative design study. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design.
The quality of a completed floor slab is dependent on. References shown following section titles are to the aashto lrfd. 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 guidelinesa effective span of slab. The construction and design of concrete slabs on grade.
Pdf design of reinforced concrete flat slab with drop. Reinforcement detailing of reinforced concrete slabs. 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. Feb 04, 2018 thus for main reinforcement up to 12 mm diameter bar and for mild exposure, the nominal cover is 15 mm b. Thickness of the slab is decided based on span to depth ratio specified in is4562000. Slab design in case of oneway slabs, the reinforcement against bending is estimated only for short direction.
Tm 580912 concrete floor slabs on grade subjected to. Slab reinforcement details how to study structural. Fip 8 design and specification of fiberreinforced concrete. Accordingly, main reinforcement is required in the two directions. We do not need to define any beam shapes since we are using a reinforced concrete slab. The reinforcement for the column strip was design for the direction from easttowest only. Moduleiii design of short and long columns with axial and eccentric loading, design of isolated column footing. The assistant generates column strips and middle strips that are adapted to the geometries of the bidirectional span of the slab. 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 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.
Step 3 cover to reinforcement determine cover required to reinforcement as per tables 11. Flat slab analysis, design and detailing pdf civil. Design of slab examples and tutorials by sharifah maszura syed mohsin. A reinforced concrete slab is built integrally with its supports and consists of two equal spans, each with a clear span of 15 ft. Aci 360, design of slabs ongrade, refers to this as a type b slab. Th e floor slab design procedure presented the maximum allowable stationary live load is lim. Generally, thickness of slab is sufficient to resist shear stresses, so there is no need for extra shear reinforcement. The slab thickness depends on the type of loads on the floor slab.
Design methodology design methodology simplified method table 3. Ce 433, summer 20 slab design example 1 5 design a one. The plans of the the podium slab and the parking ground level are shown in figs. Reinforced concrete design 1 design of slab examples. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Directly linked to the automated functionalities of the line of integration using finite elements, this application allows the user to operate in a. Design of reinforced concrete slabs by the end of this session, you will be able to.
Check the applicable joist dimensional limitations as follows. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. The technique investigated in this study 6 involves the substitution of traditional steel reinforcement with frp. Transverse reinforcement at laps bars in tension ec2. The load capacity of a slab onground is a function of its thickness, the subgrade modulus and the interaction between the slab and the subgrade. Chapter 2 should be followed except for minimum shear reinforcement. Following are the rcc slab design and detailing guidelines. Flexural reinforcement ratio is calculated from the following equation. 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. 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.
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