One way slabs are such slabs in which the loads are shared only by the shorter direction of the slab. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Load balancing is used, a portion of the load on slab is balanced by the transverse forces imposed by the draped.
A comparative design of reinforced concrete solid slab bridge for. Ramakrishna2, associate professor, department of civil engineering, malla reddy engineering college autonomous, secunderabad. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Beamless slabs beamless slabs are supported only on columns and are applied mostly in large industrial and public. The provisions in this article are meant for slab type bridges and their purpose is to limit deflections under live loads. Slab design is comparatively easy when compared with the design of other elements. For this slab, panel a has two discontinuous exterior edges and two continuous interior edges, panel b has one discontinuous and three continuous edges, while the interior panel c has all edges continuous. For flat plates and slabs the column connections can vary between. Solid slabs are fully customizable concrete slabs of varying width, length and thickness. Reinforced concrete design 1 design of slab examples. One way solid slab design free download as pdf file. Pdf design of reinforced concrete flat slab with drop. One way slab design procedure with example design of one.
Applying these provisions to the design of deck slabs rarely controls deck slab design. Slabs of uniform thickness bending and reinforced in two directions. Design of reinforced concrete structures ii twoway slabs 1 1. Foreword this report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs in addition to the recommended procedures, other methods are described for the sake of completeness and to compare. Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. One way solid slab design beam structure bending scribd. Beams of width and depth are provided on all column lines. Slab bridges are defined as structures where the deck slab also serves as the main loadcarrying component. Following are the rcc slab design and detailing guidelines. Reinforced concrete design 1 design of slab examples and. Shear strength of beamless slabs usually a controlling factor. They can be used in a variety of applications such as bridges, piers, building floors. The minimum thickness can be determined by many factors.
This help file describes input and analysis features of slab bridge designer 2. Analysis and design of continuous slab and beam footing ubani obinna u. Flat slab analysis, design and detailing pdf civil. They may be supported on two opposite sides only fig. The two classifications are oneway slab and twoway slab. Structural design versus cost comparison of solid and ribbed slab constructed building. General after making an initial selection of the slab thickness, the second step in slab design is to determine the amount and distribution of prestress.
A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Solid slab bridges are horizontal beams supported at each. This manual p rescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements responsible for military construction. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. Reinforced concrete slab design and detailing guide is456. Beside this, due to shear problems at column heads, the thickness of flat slab. Pdf structural design versus cost comparison of solid. Here are the steps for the design procedure for one way slab in steps. Flat slabs are slabs that are supported directly by columns without floor beams.
There are many advantages of flat slab such as increased head room, easier flow of mechanical and electrical services. Solid slabs can be designed and produced with mild reinforcing or by adding prestressing strands. Design and cost comparison of the solid slabs and hollow. Guide to the design and construction of reinforced. After reading this article you will learn about the design of slab and girder bridges. Pdf slabs are the flooring systems of most structures including office, commercial and residential buildings, bridges, sports stadiums and. Slabs of uniform thickness bending and reinforced in one direction. A comparative design of reinforced concrete solid slab bridge for different spans g. Concrete cover is equal to 20 mm, and stirrups are not used in slabs. Before we start the design of slabs, let us see what our words says related to your. The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure. Reinforced concrete slab design and detailing guidelines for depth of slab. Oneway and twoway slabs university of asia pacific. Design of reinforced concrete structures ii twoway slabs.
Solid slab you can see more videos of civil engineering on this link. The design bending moments are zero at discontinuous ends, negative at continuous ends and positive at midspans. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. 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. Analysis and design of slabs two way civil engineers pk. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. For those who do not know what are the des ign requirements of a slab. The beams of the solid slabs in this project are mostly continuous. Burmister 1943 and suggested that the design be based on a criterion of. A comparative design of reinforced concrete solid slab. Comparison of oneway and twoway slab behavior oneway slabs carry load in one direction. Here ratio of longer span of slab to the shorter span of slab is greater than 2. For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type.
Generally, there are two types of slab which are one way and two way slabs. Design of bridge slab spreadsheet engineering books. To design these beams, the loads affecting the longitudinal meters are calculated and designed according to the instructions of the arabic code of the engineer, emad darwish 2,3. Slab resting on walls or sufficiently deep and rigid beams on all sides. Twoway concrete slabs with openings the static system and the design of reinforcement.
Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Nalitolela for the department of civil engineering of mbeya university of science and technology. The solid slab is a customised, loosely reinforced, full concrete slab which is used in residential and industrial construction. 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. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Reinforced concrete design to bs8110 structural design 1. The design of bridge should follow the standard design practices mentioned in the irc and. Design of slab examples and tutorials by sharifah maszura syed mohsin. Mounting parts, such as electrical outlets, wiring, openings, etc. Economical for medium spans with intermediate to heavy loads. The first stage of the design is finding the bending moment of the slab panels. Oneway and twoway slabs oneway slabs transfer the imposed.
Oneway concrete slab design part 1 concept explained and minimum slab thickness canadian code duration. Slabs and flat slabs lecture 5 19 th october 2017 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. Reinforced concrete design to bs8110 structural design 1 lesson 5 1 lesson 5. If we take, there are reinforced concrete solid slabs. Structural design of flat slabs to eurocode 2 structville. First designs to follow the brab report required foun. Design the slab following the provisions of the aci code. Before going to this topic, please read it there are two types of slab classification based on the direction of bending occurs in these slabs. Heavy loads in building s such as warehouses include moving load s, stationary live loads, and wall loads. The slab has to carry a distributed permanent action of 1. Two way slab design by direct design method as per aci 31811.
Manual for design and detailing of reinforced concrete to. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. Twoway 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 crosssectional dimensions 18 in. Accordingly, main reinforcement is required in the two directions. Analysis and design of slabs two way twoway slabs have two way bending unlike oneway slab. Reinforced slab bridges used for short spans, a solid reinforced concrete slab, generally cast insitu rather than precast, is the simplest design to about 25m span, such voided slabs are more economical than prestressed slabs. Concrete slabs are commonly divided into the following types. Two way slab design by direct design method as per aci 31811, step by step procedure and limitations of direct design method for two way slab is presented.
Standard flexural rc design methods are used to determine the required reinforcement. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Bending will take place in the two directions in a dishlike form. Tech scholar, structural engineering, malla reddy engineering college autonomous, secunderabad. Department of mechanics, materials and structures english. Design moments and shears in oneway slabs can be found either by elastic analysis or through the use of the same coefficients as used for beams aci 8. Flat slabs can offer economical solutions to wider floor spans in a reinforced concrete building. Flat slab analysis and design pdf flat slab design pdf 1 this pdf lecture is created by eng.
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