Decorative grid slabs in historical structures apsis in nazare, portugal tomb of galileo, vatican city arch of septimius severus, rome 8. The strength of ribs represents the total strength of circular slab, i. The strip may have up to 20 spans and may have cantilevers at the ends. At the planning stage, you can make your entire house cost less just by making it a little bit smaller. In the study of the project the writer perform the dynamic analysis for seismic. 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. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code.
Introduction coffered slab consists of series of ribs on a small distance from each other and thin plate over them. Each span element is also given a classname of the form slabtextlinesizen where n is an integer value representing the floored result of dividing the character count by ten and a classname of the form slabtextlinelengthn where n is an integer value representing the character count. Data is taken from manufacturers tables yield strength of steel, f yp 280 nmm 2 design thickness, allowing for zinc, t p 0. Late 16th century coffered ceiling of santa maria in aracoeli, rome coffering on the ceiling of the pantheon, rome 9. Design of beam and slab sections for flexure, shear and torsion. Features of the grid slab they are used on flat sites. This calculator will estimate the require concrete volume to fill the width, height and depth given. Performance of bridge deck link slabs designed with. A coffer ceiling may or may not be plane slab for example the c.
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. 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. Slab resting on walls or sufficiently deep and rigid beams on all sides. Consequently, the shape of a slab can be modified using functions for editing of polygons. Flat slab analysis and design free version download for pc. Concrete slab volume estimator calculator engineers edge. Dec 01, 2016 features of the grid slab they are used on flat sites. Pdf a study on a twoway posttensioned concrete waffle slab. Adding corners also adds complexity and expense that is better. For example, the joint spacing for a 4inch 100 mm thick slab should be about 10 feet 3 m. How to build a log cabin the ultimate guide build log homes. Twoway slabs have two way bending unlike oneway slab.
Pdf standard method of detailing structural concrete third. Coffered slab beam structure precast concrete scribd. Flat slabs may have drop panels at columns and columns may have capitals. Find ceiling design stock images in hd and millions of other royaltyfree stock photos, illustrations and vectors in the shutterstock collection. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. 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. Because of the ribs and double reinforcement, it is more stable and recommended for larger span slabs or foundations. Design of the slab system is done for different spacing grid size of column to find. The objective has been to provide good practice a manual for best practice. The slab rests on steel tbeams with flanges oriented in the bottom.
Depending on the application, the ribs will be either precast concrete lattice ribs or wooden purlins. Anchoring of link slab the portion of the link slab beyond the unbonded length is used to anchor it into the concrete deck slab. How to build a log cabin the ultimate guide build log. Data is taken from manufacturers tables yield strength of steel, f. For each reinforcement quantity, a solid sample with 280 mm thickness and no cobiax or shear reinforcement was tested to serve as benchmark.
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. Analyze and design flat slab or waffle slab floors. The prokon suite includes a series of modules for designing concrete elements. What id like you to do now ischange your visual style back to 2d wire frame.
This must include, for coffered slabs, two layers of main tension bars together. Almutairee, design of reinforced concrete circular slabs by twoway isotropic straight joists, international journal of civil engineering and technology ijciet. Nov 01, 2016 coffers were used in historical buildings even before rcc structures came into being. Check the adequacy of the continuous composite profiled deck slab with spans of 3. The advantage of a coffered slab compared to traditional reinforced concrete slab is a possibility of bridging large spans. A suspended ceiling is not needed as services are contained in the suspended floor above the. Radiant chilled ceilings include a network of chilled water coils in ceiling panels with insulation above. Twoway joist waffle slab design approach and methodology. A suspended ceiling is not needed as services are contained in the suspended floor above the slab.
The new formscaff coffers can support a slab thickness of 0. Rectangular and circular columns, and also columns with any general shape. 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. The size, spacing, and type should match that of the adjacent concrete deck. 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. We recommend that beginners start with the easiest, simplest design to build, which is a small, square house. The flooring composite slab is made of concrete, steel reinforcement and profiled sheets t153 ruukki serving as a permanent formwork. Most popular animated black blue brown burning button casual chrome distressed elegant embossed fire fun girly glossy glowing gold gradient gray green heavy holiday ice medieval orange outline pink plain purple red rounded sciencefiction script shadow shiny small space sparkle stencil stone trippy valentines white yellow. A waffle slab is flat on top, while joists create a grid like surface on the bottom. Coffered slabs as a perspective type of the reinforced concrete structures article pdf available in matec web of conferences 86. The ratio between the cobiax and solid slabs shear strengths provided an experimental value. In waffle slabs a drop panel is automatically invoked to guarantee adequate twoway punching shear resistance at column supports. Standard system of measuring building work sixth edition preface as stated in the preface above, the committee responsible for the drafting of the sixth edition faced the challenging dual task of attempting to simplify the standard system on the one hand and to satisfy the demands of the building industry on the other hand. Concrete beam design concrete design software that designs oneway flexural members, including beams, oneway slabs and continue reading.
Twoway joist concrete slab floor waffle slab system. 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 flexibility of flat slab construction can lead to high economy and yet allow the architect great freedom of form. A wide range of factors will govern the selection of an appropriate option. Courtesy cups although the column and slab construction system is regular and efficient, kada was able to ring the changes with room arrangements, so each wing is subtly different from the next, and their ends also vary. The latter is possible through either i direct modification of vertex coordinates in the property window available for selected. Analysis and design of slabs two way civil engineers pk. Coffers were used in historical buildings even before rcc structures came into being. Pdf design of reinforced concrete circular slabs by twoway. Coffered slab free download as powerpoint presentation. Steel design steel design software that easily designs or checks steel beams, columns and single span beam columns using the asd and lrfd standards. Economy of construction is obviously an important consideration, but this is a qualitative argument until specific cases are discussed, and is a geographical variable. Decorative grid slabs in historical structures contd. The cross section of the profiled sheeting is shown in fig.
It includes two rendering applications, libraries for spatial auditory display and audio signal processing development, and a set of tools for hrtf analysis and visualization. Marking up images is easy with this free online tool. When erected, the coffer blocks and ribs form a shutter on. Planning your log cabin is the most important stage of the build. 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. It is further recommended that joint spacing be limited to a maximum of 15 feet 4. Then rcc waffle slabs were built which resembled coffers and hence it is also called coffer slab. Waffle slab or ribbed slab construction procedure and. The result is a flat slab soffit with the benefit of using flat slab formwork.
The lateral loads are independently resisted by shear walls. The load per unit area on the slab becomes the load per unit length on the slab strip. For some systems, pipework may be incorporated into plaster board. For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. Simply input the data required within the appropriate box and select update button located of the bottom.
Flat slabs are appropriate for most floor situations and also for irregular column layouts, curved floor shapes, ramps etc. Pdf posttensioned construction has for a long period of time occupied a significant position, especially. Concrete beam design concrete design software that designs oneway. The benefits of choosing flat slabs include a minimum depth solution, speed of construction, flexibility in the plan layout both in terms of the shape and column layout, a flat soffit clean finishes and freedom of layout of services and scope and space for. Once your file is marked up, simply upload it along with your with your written description using the form below. Isotropic ribs will be used and uniform distributed load is considered, thus the value of resisting moments will be constant at any angle. Coffered slab, concentrated load, winklers model of styrodur, ultimate limit state 1. Mice the concrete society editor b h g cresswell riol beng the institution of. 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. Waffle slab or ribbed slab construction procedure and advantages. With the reduction in concrete self weight, large spans can be achieved without the use of prestressed cables, providing the imposed loads are low.
Dual structural role a detailed composite slab design by nature is a two steps process. Slab construction each student used an 8 x 18 20 x 46 cm rectangular piece of white paper to draw their sketch. Uhpc link slab design uhpc workshop june 28th, 2017 jim scarlata, p. 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. And as you can see i left it in the same stateas it was at the end of the previous videowhere we tweaked the edges of the slab justby dragging the grips to modify the slab. 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 kwikstrip system produces a coffer grid spacing of 0. Waffle slab or ribbed slab is a structural component which is plain on its top and contains grid like system on its bottom surface. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. The minimum slab thickness allowed for joist slabs is onetwelfth the clear rib spacing or 1.
The first floor of the twostorey office building consists of a series of coffered precast concrete slabs supported on precast columns. Here is a detailed article with all the information regarding procedure of rcc slab roof laying. According to the coffered slab system definition, this slab has a network of ribs that form a square mesh, covered. Thousands of new, highquality pictures added every day. Comparative analysis and design of flat and grid slab. Structural steel composite slab 1 of 7 rev design project. Tn342 design example 2way mondada 093090 adapt corporation.
The joist slabs is known as, ribbed slabs, waffle floors, grid slabs, and coffered floors. Types of ceiling used in building construction and their. The top of ribbed slab is normally thin and the bottom grid lines are generally ribs which are laid perpendicular to each other with equal depth. 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. You can even merge several files together if needed. There are various types of reinforced suspended concrete floors that may be used in buildings, ranging from flat slabs, through one and twoway slabs, to ribbed and waffle slabs. In twoway slabs shorter direction strip carry greater %age of load. The concrete deck slab in this region shall be roughened to amplitude of 12. Pdf design of reinforced concrete circular slabs by two. Flat slabs are appropriate for most floor situations and also for irregular column.817 861 705 1511 1071 73 505 1317 181 108 1398 1076 343 655 1461 53 1043 210 1223 1404 1432 629 852 776 1424 624 846 1170 1225 220 667