A conventional displacementcontrolled cyclic loading routine with monotonically increasing drift levels until failure was adopted to investigate the seismic performance. Twoway flat slab concrete floor with drop panels system analysis and design design the concrete floor slab system shown below for an intermediate floor considering partition weight 20 psf, and unfactored live load 60 psf. Flat slab analysis, design and detailing pdf civil engineering. Pdf design of reinforced concrete flat slab with drop panel. For an interior panel surrounded by similar panels supporting the same distributed loads, the stiffness of the supporting beams, relative to slab stiffness is the. Design considerations for reinforced concrete flat slab. Flat slab seminar report, ppt, pdf for civil engineering. The drop panel has a dimension of 200 x 200 cm and a thickness of 40 cm. Flat slab is defined as one sided or twosided support system with sheer load of the slab being concentrated on the supporting columns and a square slab called drop panels. Oneway and twoway slabs university of asia pacific. Mar 1, 2017 reinforced flat slab design excel sheet best online engineering resource. Pdf slabs with continuous drop panels between column lines facilitate formwork.
A flat slab is a oneway or twoway system with thickenings in the slab at the columns and load bearing walls called drop panels figure 9. A of the part slab was designed for gravity and wind load in accordance with aci 31883. In some cases, the section of column at top as it meets the floor slab or drop panel, is enlarged so as to increase primarily the perimeter of the critical section, for shear and increasing the capacity of slab for resisting twoway shear and to reduce ve bm at the support. Instead of beams, column strips and middle strips consisting of reinforcements within th. Structural click modify create floor boundary tabdraw panelboundary line, and use the sketching tools to. Should a building with drop panels slabs also be using. These materials are originally located at different websites.
To evaluate the frequency and time period of the structure. The column tends to punch through the slab in flat slabs, which can be treated by three methods. Twoway flat slab concrete floor with drop panels system. This design is a complete flat plate slab design, from shear to bending along with design of columns and shear head reinforcement.
Drop in slabs concrete design structural engineering. The reinforcement for the column strip was design for the direction from easttowest only. Oct052018 twoway flat slab concrete floor with drop panels system analysis and design csa a23. The failure surface extends from the bottom of the slab, at. Flat slab types of flat slab design and its advantages.
Design the concrete floor slab system shown below for an intermediate floor considering partition weight 20 psf, and unfactored live load 60. Design considerations for reinforced concrete flat slab floor. Flat slab system is an important division of concrete floor system. Nov 20, 2014 introductionflat slabflat slab with drop panelsflat slab with column headflat slab with drop panel and column head 5. Analysis and design of flat slab with various shapes. Structural architect tabbuild panelfloor dropdown floor. Manual for design and detailing of reinforced concrete to the. Both models were tested under a constant gravity load. Direct design method ddm for slab systems with or without beams loaded only. A conventional displacementcontrolled cyclic loading routine with monotonically increasing drift levels until failure was. In such a case, the drop must be centered on the column, as per relevant code provisions. Twowayconcreteslabfloorwithdroppanelsdesigndetailing. Twoway flat slab concrete floor with drop panels system analysis and design csa a23.
Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. These thicker slabs should not be superimposed over the main slab. I cannot find or justify 100% an acceptable method to definitely determine the shear at the junction of the drop panel and the slab. Mar 06, 2018 in this video, we will learn how to design a flat slab with drop panels using robot structure analysis 2017 with a simple method. This analytical study presents the moment distribution in slabs with continuous drop panels in an attempt to provide more realistic transverse moment distribution factors. Oct 28, 2015 normally drop is provided in slabs to reduce the amount of negative reinforcement in slabs over columns, or to reduce reduce overall thickness of the slab.
Feb 22, 2018 csi etabs 2016flat slab design, strip design and punching shear check. Flat plate slab is that in which slab is directly supported on columns without column capital, drop panel or beams. The thickened portion ie the projection below the slab is called drop or drop panel. To determine stresses, moments, forces of the pt flat slab. In using the controlling equation for vc, the d used in it will always be d from the slab. Reinforced concrete slab bridges design considerations haunched slabs straight haunches preferred in lieu of parabolic depth at pier should be 2 2. Drop panels are generally provided in flat slabs or flat plate systems adjacent to the column locations to resist the punching shear forces.
If you plan to calculate deflections explicitly per 8. Pdf design of reinforced concrete flat slab with drop. Design of reinforced concrete flat slab with drop panel. Mar 23, 2015 the floor is supported by columns of size 450 mm.
The column may also be of constant section or it may be llared to form a column head or capital. Drop panels play a significant role here as they augment the. Structural architect tabbuild panelfloor drop down floor. The lateral loads are independently resisted by shear walls. Indeed, the drop panel can be considered as part of a column. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. The drops when provided shall be rectangular in plan, and have a length in each direction not less than one third of the panel length in that direction. Analysis of pt flat slab with drop considering seismic effect. Tn342 design example 2way mondada 093090 adapt corporation. Introductionflat slabflat slab with drop panelsflat slab with column headflat slab with drop panel and column head 5. Sketch the reinforcement details by showing cross sec tions i at column strip ii at middle strip.
Aci 31811 aci 31814 minimum drop width dimensions aci. Designing for shear in slabs including punching shear. In this structure the slab is created with drop panels. They increase the shear capacity and the stiffness of the floor system under vertical loads, thus increasing the economical span range. Flat slab is a reinforced concrete slab supported directly by concrete columns without the use of beams. Manual for design and detailing of reinforced concrete to. A flat slab can also be refers to as beamless slab, it is a reinforced concrete slab supported directly by concrete columns without the use of beams. Parabolic may be considered if aesthetic requirements.
For exterior panels, the width of drops at right angles to the non continuous edge and measu. Structural redesign two way slab drop panels my redesign of fordham place will comprise of a 9 flat slab with 5. Punching shear on flat slabs, columns drop panels, and the. Add a drop panel to a structural floor revit lt 2016. Design by the direct design method a typical interior flat slab with drop panels to carry a dead load of 7. Pdf distribution of moments in reinforced concrete slabs with. Extend horizontally from center line column at least 16 center line span. For shower areas, it is recommended to have kerb instead of a second drop to avoid thickening the slab at nondrop area. The flat slab is a twoway reinforced concrete slab that usually does not have beams and girders, and the loads are transferred directly to the supporting concrete columns.
Using a drop panel and a column capital in flat slab. Blast design procedure for flat slab structures dtic. The design of the slab in the direction of the drop panel according to csa a23. Csi etabs 2016flat slab design, strip design and punching. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. I have therefore increased the drop panel sizes slightly to ensure that the final checked perimeter in the drop panel i. The columns have a section dimension of 50 x 50 cm and the slab thickness is 20 cm. The floor system consists of six panels in each direction.
The properties of column size, drop panel size, slab thickness taken as. Add drop panels to reinforce a structural floor at column locations open a plan view with a structural floor over a column. Slab with drop and column with column head the portion of flat slab that is bound on each of its four sides by centre lines of adjacent columns is called a panel. This report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs.
What is the minimum thickness of drop panel and column and. If we have a drop panel, what is the use of the extra drop assuming it is less or larger than the slab thickness. Materials used for this redesign is normal weight concrete with compressive strength of 4ksi and steel rebar with a yield stress of 60 ksi. The properties of column size, drop panel size, slab thickness taken as per the design given as per is code. These various forms of construction are illustrated in figure 8. The design i am going to share with you today is design of flat plate slab as by definition. Beam design in order to be able to design beams, we need both moments and shears. A plain ceiling is obtained thus giving attractive appearance from an architectural point of view. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. This educational solved example for the design of reinforced concrete flat slab with drop panel, and check for punching shear. How to design flat slab with drop panel in robot youtube. Drop panel sizes structural engineering general discussion. Flat slab is designed by using direct design method.
Oct 11, 2017 if we have a drop panel, what is the use of the extra drop assuming it is less or larger than the slab thickness. 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. Reinforced flat slab design excel sheet best online. Should a building with drop panels slabs also be using beams. Normally drop is provided in slabs to reduce the amount of negative reinforcement in slabs over columns, or to reduce reduce overall thickness of the slab. Department of mechanics, materials and structures english. The design bending moments are zero at discontinuous ends, negative at continuous ends and positive at midspans. Tensioning building structures march 12, 2020 2020 educode las vegas. Slab design reading assignment chapter 9 of text and, chapter of aci31802. A civil engineer must know all the aspects regarding the flat floor system. Flat slab is defined as one sided or twosided support system with sheer load of the slab being concentrated on the supporting columns and a.