The result is a flat slab soffit with the benefit of using flat slab formwork. The kwikstrip system produces a coffer grid spacing of 0. A slab of calacatta gold marble on wroughtiron pins looks sculptural and functions for serving. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. An alternate analysis model is proposed assuming that. The minimum slab thickness allowed for joist slabs is onetwelfth the clear rib spacing or 1. While other materials are occasionally used when building home. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Flat slab analysis, design and detailing pdf civil. Click on the slab to select it and edit its size and shape as needed. Analysis of twoway slabs with and without opening for. Twoway joist concrete slab floor waffle slab system.
L center to center distance between the support b depth of slab. In twoway slabs shorter direction strip carry greater %age of load. Creating a hole in a slab chief architect software. Twoway slabs have two way bending unlike oneway slab. Pantheum, from greek pantheion, temple of all the gods is a former roman temple, now a catholic church basilica di santa maria ad martyres or basilica of st. Installation hollowcore slabs are to be located and installed in accordance with expocrete drawing. Flat slab analysis, design and detailing pdf civil engineering. Coffered slab beam structure precast concrete scribd. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. 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. Effective span of slab shall be lesser of the two 1. A concrete slab is one of the most common foundation types found in residential home construction. Failure analysis of columnslab connections with stud.
Uhpc link slab design uhpc workshop june 28th, 2017 jim scarlata, p. Twoway joist waffle slab design approach and methodology. Slab gives you greater control over how you organize your knowledge. Comslab is a combination of deep steel decking and a concrete cover slab that have cured together and bonded structurally as one element. In waffle slabs a drop panel is automatically invoked to guarantee adequate twoway punching shear resistance at column supports. Coffered slab free download as powerpoint presentation. Concrete beam design concrete design software that designs oneway flexural members, including beams, oneway slabs and. This is a flat, uniform foundation thats made of sturdy concrete on level ground. 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. 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. Comparative study of reinforced concrete flat slabs with and.
The eccentric shear stress model that forms the basis of design according to the aci building code aci 31883 is found to not correlate well with the data. Introduction coffered slab consists of series of ribs on a small distance from each other and thin plate over them. A civil engineer must know all the aspects regarding the flat floor system. Nov 01, 2016 coffers were used in historical buildings even before rcc structures came into being. Chairbacks treated to cutvelvet panels introduce pops of color. Coffers were used in historical buildings even before rcc structures came into being. Enhancement due to the effect of inplane forces on the bending capacity. Although, the approach is promising, it was not implemented to the canadian code so far. The construction and design of concrete slabs on grade.
Slab resting on walls or sufficiently deep and rigid beams on all sides. Features of the grid slab they are used on flat sites. Maximum stockpile for 203 mm hollowcore is 6 slabs, and for 305 mm is 4 slabs. 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. Waffle slab or ribbed slab construction procedure and advantages.
Flat slabs may have drop panels at columns and columns may have capitals. Table 1 how block shape influences strength values represent the relative compressive strength of units loaded as shown, expressed as a percentage of the strength of units when theyre loaded with cells vertical. We switched to slab and couldnt be happier love the organization, search and editing experience. Reinforced concrete, slab, beam, explosion, impulse load, dynamic, sdof system, equivalent static load, nonlinear fem. And unlike other wikis, slab has realtime collaboration. Analysis of waffle slabs with and without openings. A waffle slab or twoway joist slab is a concrete slab made of reinforced concrete with concrete ribs running in two directions on its underside. Sort posts so teammates know what to read, and when. Analysis of forming slab method forming of materials is a complex process, involving either biaxial or triaxial state of stress on the material being formed.
For each reinforcement quantity, a solid sample with 280 mm thickness and no cobiax or shear reinforcement was tested to serve as benchmark. Design of reinforced concrete slab with regard to explosions master of science thesis in the masters programme structural engineering and building performance design. Prediction of forming load in a particular process is rather empirical. Coffered slab, concentrated load, winklers model of styrodur, ultimate limit state 1. These materials are originally located at different websites. The construction and design of concrete slabs on grade d. Economy of construction is obviously an important consideration, but this is a qualitative argument until specific cases are discussed, and is a geographical variable. 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 lacunar ceiling. 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. The new formscaff coffers can support a slab thickness of 0. The load per unit area on the slab becomes the load per unit length on the slab strip. The coefficient depends upon the temperature drop as well as the length of the slab.
Mary and the martyrs, in rome, italy, on the site of an earlier temple commissioned by marcus agrippa during the reign of augustus 27 bc 14 ad. Pdf design of reinforced concrete circular slabs by twoway. Steel design steel design software that easily designs or checks steel beams, columns and single span beam columns using the asd and lrfd standards. Analysis of the forming process, therefore is highly involved. Failure analysis of columnslab connections with stud shear. An internal knowledge base and wiki for distributed teams. The ratio between the cobiax and solid slabs shear strengths provided an experimental value. Select build slab slab hole from the menu, then click and drag to draw a small rectangular slab hole entirely within the existing slab. Because of the ribs and double reinforcement, it is more stable and recommended for larger span slabs or foundations. Coffered slabs as a perspective type of the reinforced concrete structures article pdf available in matec web of conferences 86. 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. Comparative study of reinforced concrete flat slabs with. Window shades used for privacy at night retract under the cornices during. The advantage of a coffered slab compared to traditional reinforced concrete slab is a possibility of bridging large spans.
Introduction currently the flat slab system is widely used in construction because of architectural flexibility, more clear space, less building height, easier formwork and shorter construction time. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Sep 29, 2015 a concrete slab is one of the most common foundation types found in residential home construction. Analysis and design of slabs two way civil engineers pk. The good performance of rc circular slab which design by the present. The joist slabs is known as, ribbed slabs, waffle floors, grid slabs, and coffered floors. Depending on the application, the ribs will be either precast concrete lattice ribs or wooden purlins. 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. Dave holbrook is a freelance carpenter and a jlc contributing editor. Failure analysis of columnslab connections with stud shear reinforcement hong guan. Then rcc waffle slabs were built which resembled coffers and hence it is also called coffer slab. 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.
The coffered ceiling comprised two grids separated by a drop beam, with one grid in the. 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. Flat slab system is an important division of concrete floor system. The second edition launched august 9, 2016 at the ana worlds fair of money in anaheim. Assume partitions cannot be damaged by deflections. Understanding different concrete slab problems and defects. Analysis of waffle slabs with and without openings request pdf. Analyze and design flat slab or waffle slab floors. Flat slab with flat slab with drop column head panel and column head fig. Concrete beam design concrete design software that designs oneway. They found their method is more reliable than those by codes when the average v pr ed v exp is 0. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. 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.
Plan view of floor system assume partitions will not be damaged by deflections. Here is a detailed article with all the information regarding procedure of rcc slab roof laying. Keep the dunnage accurately aligned from slab to slab. Slab helps us onboard new reps faster and keep our processes streamlined. When erected, the coffer blocks and ribs form a shutter on. Uhpc link slab design new york state department of. For slab thicknesses of 6 inches, lengths between 20 and 100 feet, the. If playback doesnt begin shortly, try restarting your device. Select build slab slab or slab with footing from the menu, then click and drag to draw a rectangular slab. It is further recommended that joint spacing be limited to a maximum of 15 feet 4.
Get on the sample slab update mailing list for news. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c 5 c 6 c 7 c 8 32 s ss 22 3 7 c 9 c 10 c 11 c 12 32 8 11 b 1210 bb c c 14 c 15 c 16 16. The strip may have up to 20 spans and may have cantilevers at the ends. For example, the joint spacing for a 4inch 100 mm thick slab should be about 10 feet 3 m. Introduction concrete slabs on grade are a very common type of concrete construction.
With the reduction in concrete self weight, large spans can be achieved without the use of prestressed cables, providing the imposed loads are low. 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. A suspended ceiling is not needed as services are contained in the suspended floor above the slab. Asce, secb course content slab on grades construction. This construction technique results in significant cost savings and is ideal for fast track construction. While other materials are occasionally used when building home foundations, concrete slabs are by far the most popular. The lateral loads are independently resisted by shear walls.
449 503 242 263 1255 434 1088 1033 156 1285 682 1295 8 1485 1004 519 640 996 933 384 1076 122 1440 66 665 1042 1145 233 453 311 116 65 1204 1477 493 919 497 796 1302 167 506 640 1442 1372 644 361 264 1356