Know more about various advantages and disadvantages of panel doors before you choose panel doors for your home. Singh when a large space within a building needs to. The purpose of this paper is to demonstrate the performance of link slabs designed with ductile ecc material for macroscopically crack free concrete bridge decks. Flat slab analysis, design and detailing pdf civil.
Department of mechanics, materials and structures english. The load per unit area on the slab becomes the load per unit length on the slab strip. The reinforced concrete waffle slab ribbed slab plan view includes main top longitudinal and transverse reinforcement, ribbing beams reinforcement, waffles dimensioning, voids width see more. The advantage of a coffered slab compared to traditional reinforced concrete slab is a possibility of bridging large spans.
To make the superstructure continuous for live load. Mice the concrete society editor b h g cresswell riol beng the institution of. Steel design steel design software that easily designs or checks steel beams, columns and single span beam columns using the asd and lrfd standards. This type of reinforcement is common on concrete, wood and metal construction. Reinforced concrete effective span centretocentre distance between supports longer dimension of a rectangular panel of slab for yield line calculations modular ratio esec design bending moment per unit width of slab modified to account for axial load moment per unit width about xaxis moment per unit width about yaxis. This strip can then be analyzed by the methods that were used for rectangular beams, the bending moment being computed for the strip of unit width. It is a biaxial reinforced concrete flat slab system, with a grid of internal spherical void formers. The variations presented later in this paper have been derived empirically. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c. Pdf slab pull, slab weakening, and their relation to deep.
Behavior and design of link slabs for jointless bridge decks. Note that exposed face grid products are typically differentiated by the width of. There are 16 different types of slabs in construction. An internal knowledge base and wiki for distributed teams. A coffer or coffering in architecture is a series of sunken panels in the shape of a square, rectangle, or octagon in a ceiling, soffit or vault. Sep 03, 2011 reinforced concrete effective span centretocentre distance between supports longer dimension of a rectangular panel of slab for yield line calculations modular ratio esec design bending moment per unit width of slab modified to account for axial load moment per unit width about xaxis moment per unit width about yaxis. Coffered slab decorative coffered slabs in historical structures a series of these sunken panels were used as decoration for a ceiling or a vault, also called caissons boxes, or lacunaria spaces, openings giuliano da sangallos flat caisson ceiling, basilica di santa maria maggiore, rome gilded coffering on a barrel vault. Here is a detailed article with all the information regarding procedure of rcc slab roof laying. Do structural requirements influence the choice of slab type. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Comslab is a combination of deep steel decking and a concrete cover slab that have cured together and bonded structurally as one element.
The good performance of rc circular slab which design by the present. Slab components define the sections that make up a slab. They add extra beauty, strength or stability to doors. Placing the steel any lower than this limit could, however, adversely affect the performance of the slab. A coffered ceiling is a method of finishing a ceiling by building in indented boxes. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Design of reinforced concrete slab with regard to explosions. A properly reinforced coffer or waffle slab can span the same distances as a regular slab would, weighing far less. Slab formwork essentially consists of a horizontal loadbearing structure which supports the formlining and transfers the forces into the shoring. Nancy debora assistant professor civil karunya university 2. Cad blocks and files can be downloaded in the formats dwg, rfa, ipt, f3d. To make the slab design independent of the type of rail, we will place the wheel load 1 from the nominal face of the rail 1ft from the edge of the slab.
Oneway and twoway slabs university of asia pacific. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Waffle slab or ribbed slab construction procedure and advantages. Simply input the data required within the appropriate box and select update button located of the bottom. Concrete beam design concrete design software that designs oneway flexural members, including beams, oneway slabs and continue reading. Both slab on grade and structural slabs can be created using this formwork. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor.
Panel doors are quite popular in homes for various reasons. Tips for laying rcc slab roof on 12092014 9091 views 3 comments rcc slab laying is one of major step in any type of construction so it is mandatory to know all the points related to laying rcc slab. Drawing labels, details, and other text information extracted from the cad file translated from spanish. 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. Link slab design the nysdot office of structures has developed an innovative link slab design utilizing ultra high performance concrete uhpc. Precast concrete in detail arch 436 contemporary building construction methods lecture objectives upon completion of this lecture, the student will be able to. Slab gilded coffering on a barrel vault of the apsis in nazar, portugal giuliano da sangallos flat caisson ceiling, basilica di santa maria maggiore, rome decorative coffered slabs in historical structures coffering on the arch of septimius severus, rome a series of these sunken panels were used as decoration for a ceiling or a vault. Rcc slab laying is one of major step in any type of construction so it is mandatory to know all the points related to laying rcc slab.
The slab has to carry a distributed permanent action of 1. This is the compilation of the presentations available for grid slabs on slideshare plezzzzzzzzzz mark brainlist i have only 1 brainlist anshwer. Formscaffs trough system is used to produce a one way spanning concrete slab with a multiple inverted gutter shaped soffit finish. The new formscaff coffers can support a slab thickness of 0. This must include, for coffered slabs, two layers of main tension bars together. Theoretical concepts, practi cal applications, basis of.
Most of the work is done by the steel anyways, and all the steel needed is alread. Generally, there are two types of slab which are one way and two way slabs. Nowadays, access to powerful computers and advanced software gives possibility to create accurate models by means of the finite. The objective has been to provide good practice a manual for best practice. Analysis and design of slabs two way civil engineers pk. This method has been used extensively since 1963 for. Whereas, table 2 shows the results of the slab provided with 5 ribs along each of the two spans, table 3 gives results for slab with 7 ribs. The construction and design of concrete slabs on grade.
For girder slab formwork, wooden or aluminum girders are crosswisemounted and covered with formlining of choice. Beware waffle slabs structural engineers cornell engineers. Slabs are usually used in floor and roof construction. Gilded coffering on a barrel vault of the apsis in nazare, portugal giuliano da sangallos flat caisson ceiling, basilica di santa maria maggiore, rome decorative coffered slabs in historical structures coffering on the arch of septimius severus, rome a series of these sunken panels were used as decoration for a ceiling or a vault, also called. This construction technique results in significant cost savings and is ideal for fast track construction. Flat slabs may have drop panels at columns and columns may have capitals. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Coffers can be supported on both the kwikstrip and kwikdeck systems.
Pdf standard method of detailing structural concrete third. The construction and design of concrete slabs on grade d. We manufacture high quality precast concrete coffer ceiling units. Buildability often turns out to be the builders problem with not much though.
The kwikstrip system produces a coffer grid spacing of 0. I would like to copy this floor level to the next as they re exactly the same but when i copy the voids do not show. The exposed precast ceilings provide an attractive architectural look to the interior of the building and are typically used for offices, airports, libraries and other high specification buildings. Panel doors are hard or provide more security and privacy to your home. Slab pull, slab weakening, and their relation to deep intraslab seismicity article pdf available in geophysical research letters 3214 july 2005 with 46 reads how we measure reads. 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. Coffered slab free download as powerpoint presentation. In twoway slabs shorter direction strip carry greater %age of load. A waffle slab is a type of building material that has twodirectional reinforcement on the outside of the material, giving it the shape of the pockets on a waffle.
In the selection of ecc material, the property requirements on the link slab material as well as processing demands were considered. Twoway concrete slabs with openings these problems cannot be solved by analytical methods since such structures like concrete slabs with openings, especially strengthened with carbon fibres, are too complicated. 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. Based on our analysis that considered the distribution of strain due to girder end rotation, it was. The joist slabs is known as, ribbed slabs, waffle floors, grid slabs, and coffered floors. Some of them are outdated and many of them are frequently used everywhere. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Results for slab with 9 ribs in each direction are given in table 4. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1.
In case of one ways slabs, the aci approximate analysis is applicable to one way slab system where a one way slab is continuous with a one way slab. In this article, ill give a detailed explanation of each slab where to. Solid slabs are fully customizable concrete slabs of varying width, length and thickness. Donn dx suspension system is an exposed 24 mm 1516 wide face grid. Analysis and design of link slabs in jointless bridges with. I have a 325mm coffered floor slab that i am trying to model in revit. The first floor of the twostorey office building consists of a series of coffered precast concrete slabs supported on precast columns. Jan 10, 2016 what is flat grid slab waffle slab system.
Precast was chosen for its energy efficiency the concrete mass provides thermal energy storage and to keep the overall height of the building as low as possible. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Because of the ribs and double reinforcement, it is more stable and recommended for larger span slabs or foundations. Reinforced concrete design 1 design of slab examples. Long span flat slab systems with internal spherical void formers have been used in europe for a decade now. Good day i am still a newbie to the forum and revit. Solid slabs can be designed and produced with mild reinforcing or by adding prestressing strands. Free cad and bim blocks library content for autocad, autocad lt, revit, inventor, fusion 360 and other 2d and 3d cad applications by autodesk. Heavy loads in building s such as warehouses include moving load s, stationary live loads, and wall loads. Analysis and design of waff le slab with different. Pdf design of reinforced concrete circular slabs by twoway. Upon completion of the waffle slab house, the ground around the slab is built up by the builder to reduce the height of the slab above the. Cad forum cadbim library of free blocks coffer slab. Flat slab analysis and design free version download for pc.
Even if you are able to allow for cracking in the fem unlikely, the way an equivalent thickness flat slab cracks and its effect on stiffness will be completely different to a waffle slab which is effectively a t section. Coffered slab beam structure precast concrete scribd. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Performance of bridge deck link slabs designed with ductile ecc. Materials with high tensile strain capacity, such as fibre reinforced concrete frc, can be used for application in the link slab to improve the strength, durability and cracking characteristics of the link slab. Then rcc waffle slabs were built which resembled coffers and hence it is also called coffer slab. Twoway joist concrete slab floor waffle slab system. To distribute flexural stresses and strains within the uhpc over a larger area. For example, to indicate that a slab is made up of gypsum board ceiling, wood framing, and a plywood deck, define a component for each of these items to illustrate their location. Twoway slabs have two way bending unlike oneway slab. They can be used in a variety of applications such as bridges, piers, building floors, roof systems, detention vault lids and boat launches. Late 16th century coffered ceiling of santa maria in aracoeli, rome coffering on the ceiling of the pantheon, rome 9. The analysis and design follow the equivalent frame analysis method of the aci code, which considers a onebay wide strip of the floor system as a continuous frame.
Slab features a beautiful editor, blazing fast search, and dozens of integrations like g suite, slack, and github. Waffle slab design and anlaysis as equivalent solid slab. For most conventional slabongrade design, the steel does not have to be discontinuous at the. Concrete slab volume estimator calculator engineers edge. Also, torsional stiffnesses will be completely different. The lateral loads are independently resisted by shear walls. 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. A waffle slab is a twoway concrete slab reinforced by ribs in two directions.
In this project, the design of composite slab and connection with the beam using shear connectors have been done using insdag design manual based on assumptions of eurocode4 and is. 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. Decorative grid slabs in historical structures contd. Asce, secb course content slab on grades construction. Two way slab design by direct design method as per aci 31811. The williams coffer slab system consists of removable plastic coffer blocks suspended between a series of parallel ribs spanned across the area where a concrete slab is required. They may be supported on two opposite sides only fig.
Depending on the application, the ribs will be either precast concrete lattice ribs or wooden purlins. The word coffer is a word that can mean box or chest, and as such a coffered ceiling is quite literally a. Richardson15 also studied there moval of expansion joints from bridges using continuous and partially debonded decks and developed a sim plified design procedure. The word coffer is a word that can mean box or chest, and as such a. Detail is a plan view of a ribbed waffle slab that can be used as an example for other projects. I have tried to use the void blend though it seems this is a long method. Flat slab flat slab are also known as beamless slab, is a type of slab in which the flooring slab is directly supported on columns without the agency of beam or girders. Decorative grid slabs in historical structures apsis in nazare, portugal tomb of galileo, vatican city arch of septimius severus, rome 8. A suspended ceiling is not needed as services are contained in the suspended floor above the. Oct 11, 2011 with the detailed slab creator you can turn a slab into a detailed structure.
This new system they invented is called the holedeck. The ribs between the troughs are reinforced to act as down stand concrete beams. A series of these sunken panels was often used as decoration for a ceiling or a vault, also called caissons boxes, or lacunaria spaces, openings, so that a coffered ceiling can be called a. Introduction concrete slabs on grade are a very common type of concrete construction. Analyze and design flat slab or waffle slab floors. Nov 01, 2016 coffers were used in historical buildings even before rcc structures came into being. This calculator will estimate the require concrete volume to fill the width, height and depth given.
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