Reinforced concrete hollow block slab is designed to reduce the dead load of slab and. Drawing labels, details, and other text information extracted from the cad file translated from spanish. However, hollow concrete block walls are not structurally very strong and will not resist the flexural stress that a wall is subjected to, causing them to collapse easily. Concrete hollow blocks, precast concrete and cast in place. Details are available in both adobe acrobat reader pdf and cad dxf format. The construction and design of concrete slabs on grade d. Hollow block detail dwg detail for autocad designs cad. The top block was cast in the laboratory directly on the bottom block using a concrete strength that would typically be encountered in toppings. In addition, features of production of panels provide to the ready building the raised heat insulation of interfloor overlappings. If you have any questions, contact your ascc concrete contractor or the ascc technical hotline at 800 3310668. Description of original building the case of study original building is a reinforced concrete hollow block slab building which can be used as a commercial one, the building is not designed according t o seismic standards. Is it possible to design this type of slabs by using autodesk robot. The appropriate ratio may be obtained from table 3.
An assessment of time variation in solid and hollow floor. Sketch on hollow pot slab plan slab dimensions hollow pot slab width, b 3. First designs to follow the brab report required foundations heavier even than the san antonio. Economy of structure is one of the basic aspect upon which any design is based. Hoogenboom delft university of technology, faculty of civil engineering and geosciences, delft, the netherlands this paper provides a procedure for finite element analysis of hollowcore slab floors, which may be necessary in case of large floor openings. Below is a step by step process on how wells hollowcore can perform under the ibc code. Large buildings typically use copious amounts of concrete block.
Perfect slabs is a supplier of elematic sa en shukuma flooring systems. Investigating the effect of solid and lightweight hollow block slabs on. Introduction concrete slabs on grade are a very common type of concrete construction. Furthermore, the crack that occurs in the bottom part of the slab due to the. Hordy slabhollow block slab hollow blocks are used to fill portions of the slab thickness. In general, it is seen that in solid slab a portion of concrete below the neutral axis remains ineffective. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. They are manufactured to bs en 77 using class 1 limestone aggregates. Exiso gui makes easier to extract multiple iso with a queue list and a little ftp browser. Nagy 1 and istvan szatmari 2 technical university of budapest, department of steel structures h1521 budapest summary there is an enhanced intention imposed on building construction industry to improve time and structural efficiency of structures. Load carrying capacity of hollow concrete block masonry. Pci manual for the design of hollow core slabs and walls, 3rd edition free pdf download mnl12615 this manual presents in detail design of hollow core slabs for gravity and lateral loads.
Flexural stress comes from the pressure of the load the walls bear from the upper. The dead load for the hollow block slab is given by. In sap program, the model has been divided to frame elements to represent ribs and beams and shell elements to represent the slab and solid part. Hollowcore slabs with castinplace concrete toppings.
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. Background of simple design method 12 membrane forces along yield lines 2 simple design method of reinforced concrete slabs at 20 c k,b are parameters defining magnitude of membrane forces, n is a factor deduced from yield line theory, k is the ratio of the reinforcement in the shorter span to the reinforcement in the longer span. Design of reinforced concrete slab with regard to explosions master of science thesis in the masters programme structural engineering and building performance design rickard augustsson markus harenstam department of civil and environmental engineering division of structural engineering concrete structures chalmers university of technology. The minimum spacing of reinforcing bars should preferably be 6 in.
Concrete blocks and pavers mix design and manufacturing. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Comparative analysis of hollow clay blocks and solid. Load carrying capacity of hollow concrete block masonry column. Details name hollow block slab design pages 120 format pdf size 1. In this construction system, structurally, each wall and slab behaves as a shear wall and a diaphragm respectively, reducing the vulnerability of disastrous damage to the structurebuilding, during the natural hazards. Structural consideration in design of reinforced concrete. Concrete acoustic noise barriers, noise reducing barrier, concrete barrier, concrete noise reducing barrier, concrete road barrier, concrete sound wall, absorptive noise barriers. I understand the difficulties behind such modeling. The purpose of this publication is to widen the understanding of posttensioned floor construction and show the considerable benefits which include minimum storey heights, rapid construction, economy, maximum design flexibility, minimum number of columns, optimum clear spans, jointfree, crackfree. The seismic performance, shortfalls in design and detailing methods of slabs with holes are explained. Apr 24, 2015 ribbed slab hollow block slab hourdi block different sizes 4. Hollow block slab are a type of composite flooring. Saccoman, chairperson james beerbower ernest markle.
If the soil is unsuitable to hold the slab load design, pontex is used which in turn will create a one directional. Hollow block slab design civil engineering community civilax. A 120mmthick slab with a minimum rib thickness of 125 mm for continuous ribs is required to achieve a 2hour fire rating. Longitudinal steel should be detailed in a 2bar alternating pattern, with one of the bars continuous through the slab. Design project calculation sheet checked by pu date 080800 check the adequacy of the continuous composite profiled deck slab with spans of 3. Ribbed slabs oneway joists introducing voids to the soffit of a slab reduces dead weight and increases the efficiency of the concrete section. The slab was assumed to be an interior panel in a building with over 3 panels in either direction. Hollow block slab design civil engineering community.
Manual for the design of hollow core slabs second edition by donald r. Hollow clay floor slab blocks floor slabs archiproducts. Pdf in the design of reinforcedconcrete buildings, solid and lightweight hollow block slabs are commonly preferred. In order to view pdf documents, you must have adobe acrobat reader installed. Design of flat slabs using shell finite element analysis. Hollow core slabs are precast, prestressed concrete elements that are generally used for flooring for both commercial buildings and homes. In case of hollow block slab voided blocks are placed to reduce the total weight of the slab. Only the conditions at the centre of the span in the width of slab under consideration should be considered to influence deflection. Reinforced concrete slab design and detailing guide is456. Floor voids and penetrations are available, trimmer beams can also be used. Dec 27, 2016 dec 27, 2016 hordy slab hollow block slab. Design of reinforced concrete slab with regard to explosions. Design analysis of prestressed hollow core slabs on flexible. The design calculations for all slab specimens are based on aci318 2014 and.
Comparision of behaviour of hollow core slab building and solid slab building for different seismic zones keeping the member size same for all models. How are the hollow block held in hollow block slab. Use of precast hollow core slabs in high rise buildings. Hollow blocks have a minimum crushing strength of 3. Hollow block slab building, masonry infill walls, pushover. Jul 02, 20 introduction hollow block and ribbed slabs are formed by placing blocks on the slab and concrete ribs. Lecture l t 2 design of hollow block and ribbed slabs. Saccoman, chairperson james beerbower ernest markle kevin boyle james markle jeffrey butler milo j. American suburban houses typically employ a concrete foundation and slab with a concrete block wall on the perimeter. Availability of this program was discontinued in 2008. Waleed abo elwafa mohamed, seismic capacity of rc hollow block slab bu loglqj 2. Reprinted from pci manual for the design of hollowcore slabs.
The blocks are considered as nonstructural element as they do not contribute to strength of. Mnl126 manual for the design of hollow core slabs free pdf. They are basically floor formed over tbeams filled with filling material. A complete revision of the diaphragm chapter includes the latest design information. Example calculations for this and all other example problems the following data from the canam united steel deck design manual and catalog of steel deck products will be used and are worked using lrfd methodology. Ribbed slab hollow block slab hourdi block different sizes 4. Hollow core concrete concrete hollow core floor slabs. Hollow core spans 50 feet plus continuous installation minimizing down time on site for other trades proper coordination and quick installation allows for a fastpaced. The electrical slab boxes, which are the same size as the concrete slab blocks, allow for down lighters anywhere in the slab and the electrical conduits to be positioned correctly.
The slab has to carry a distributed permanent action of 1. Housing report buildings with hollow clay tile load. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabsonground. Information on other aspects, su ch as materials, construction methods, placement of.
Hollowcore is an extruded, prestressed concrete slab with continuous voids to reduce weight and cost. Hollow core concrete concrete acoustic noise barriers. We satisfy the demand for high quality, reliable products that are available within short. Building walls using hollow concrete block is an economical means to creating a structure. Adobe acrobat reader is free and can be downloaded here. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor.
Solid blocks have no cavities, or according to us standards have no voids amounting to not more than 25% of the gross crosssectional area. How to reinforce a hollow concrete block wall hunker. The results of this analysis are compared with the results of the finite element method by sap program. Concrete slabs behave primarily as flexural members and the design is similar to that of beams except that. When the ribs are in one direction then it is a oneway hollow block slab. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Improved sound and heat insulation further enhance this system.
Pdf investigating the effect of solid and lightweight hollow block. Asce, secb course content slab on grades construction. In the design of reinforcedconcrete buildings, solid and lightweight hollow block slabs are commonly preferred. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Design of slab for flexure 067 m unit width of slab. Pcicpci design manuals design of hollow core slabs design of hollow core slabs.
Posttensioning concrete increases the many benefits associated with a concrete framed building. Pdf very often, in the design process of buildings, the storey height is an essential problem for the investor and architect. I used several softwares, none of them can model ribbed slab. The slab is propped at the centre during construction stage.
Pdf design analysis of prestressed hollow core slabs on. In case of ribbed slab the blocks are not permanent. Structural steel composite slab 1 of 7 rev design project. They are the minimum total slab thickness and strand clear cover. Concrete hollow blocks, precast concrete and cast in. Mathematical structural analysis of one way ribbed slabs was introduced in this paper. Crosssections through a ribbed and hollow block floor slab are shown in ligure 8. It is primarily used as a floor and roof deck system. Test of a hollow tile and concrete floor slab reinforced. Pdf the problem of reducing the selfweight of reinforced concrete. Introduction hollow block and ribbed slabs are formed by placing blocks on the slab and concrete ribs.
The saving of materials tends to be offset by some. The hollow blocks are placed between these tbeams and act as the flooring. Design of the composite flooring slab with profiled sheets t153 ruukki for a residential building, 35 pages, 1 appendix saimaa university of applied sciences, lappeenranta technology, civil and construction engineering civil and construction engineering bachelouv theviv 201. The total void area can amount to 50% of the gross crosssectional area. Design methods, holes in slabs, seismic performance. A slightly deeper section is required but these stiffer floors facilitate longer spans and provision of holes. Hello everyone, im trying to model a concrete building, and it has hollow block slabs. Concrete, block, and slab foundations climate, including high water tables, frost lines, harsh winters, and vulnerability to storm surge and high winds, will determine whether a slab or below. Pdf behavior of one way reinforced concrete slabs with styropor. The construction and design of concrete slabs on grade. Following are the rcc slab design and detailing guidelines.
Hollow blocks are the most common type of concrete blocks, having one or more holes that are open at both sides. Published on december 16, 2015 december 16, 2015 16 likes 2 comments. A copy of the tables is provided in the appendix and also. There are two requirements that have to be met in this code to achieve the desired fire endurance. The design of composite slabs and beams is discussed in detail in relation to the eurocodes and bs 5950. Hollow blocks made of lightweight concrete or other. The basis of design justifies this advance in utilization. Hollowcore slab dwg detail for autocad designs cad.
Prepared for the pci hollow core slab producers committee john e. Find the following parameters for design moments in step 2 per unit width step 4 note. Formulas for homogenisation of the floor properties. The main advantage of use of the hollow floor slabs meeting the standard considerable simplification of process of construction and laying of utilities. Pci manual for the design of hollow core slabs and walls. Dxf files can be imported directly into many common cad programs. Search all products, brands and retailers of hollow clay floor slab blocks. The design of hollow clay blocks slabs depend on the fact that concrete in tension below the neutral axis.
In addition to general ultimate and serviceability limit state design issues, practical design considerations such as the formation of holes in the slab, support details, fire protection, and attachments to the slab are discussed. Reinforced concrete design 1 design of slab examples and. The ribbed floor is formed using temporary or permanent shuttering while the hollow block floor is generally constructed with blocks made of clay tile or with concrete containing a lightweight aggregate. Coefficientsofnegativemomentforinteriorpanels 763 34. Similar features and more are now available in sumo structural modeller and frame analysis with the finite element addon. Hollow core slab properties prop imperial metric a 235. The main ingredients in manufacturing solid concrete blocks are. Inside the mind of a master procrastinator tim urban duration.
Hollowcore is very economical and provides great design flexibility. Please practice handwashing and social distancing, and check out our resources for adapting to these times. The cross section of the profiled sheeting is shown in fig. Hoogenboom delft university of technology, faculty of civil engineering and geosciences, delft, the netherlands this paper provides a procedure for finite element analysis of hollow core slab floors, which may be necessary in case of large floor openings. Pontex is recycled polypropylene element that, combined with cupolex can be used to create beams so that aerated floors become selfbearing. The breadth of solid slabs is assumed to be one meter wide while hollow block slabs are designed as t beams with effective width equal to the spacing between ribs. Experimental study of two way half slab precast using.
979 257 909 85 240 1426 589 1002 955 828 225 1006 1189 863 827 834 1095 463 497 1543 333 386 1174 1554 1251 707 13 1184 173 798 768 675 392 1511 657 1133 50 359 102 375 884 756 745 969 488 1073 663 424 949