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Students Click Here. Related Projects. This question is primarily in relation to BS but would obviously be applicable everywhere although presumably dealt with a bit differently.

When sizing a drop panel, which will need shear reinforcement within it is it necessary to size it based on the point when no shear reinforcement is then required? Obviously then the slab depth would need to be checked at the drop panel perimeter and onwards as required. I was wondering if there is any way of assessing the shear reinforcement required if the drop panel depth is kept to a minimum.The panel considered is an edge panel, as shown in figure 8.

The moment coefficients are taken from table 8. Support ad. The design of reinforcement to resist these moments would follow the usual procedure. Torsion reinforcementaccording to rule 4 is required at corners b and c. A fiat slab floor is a reinforced concrete slab supported directly by concrete columns without the use of intermediary beams.

The slab may be of constant thickness throughout or in the area of the column it may be thickened as a drop panel. The column may also be of constant section or it may be llared to form a column head or capital. These various forms of construction are illustrated in figure 8. The drop panels are effective in reducing the shearing stresses where the column is liable to punch through the slab, and they also provide an increased moment of resistance where the negative moments are greatest.

The flat slab floor has many advantages over the beam and slab floor. The simplified formwork and the reduced storey heights make it more economical.

Windows can extend up to the underside of the slab, and there are no beams to obstruct the light and the circulation of air. The absence of sharp corners gives greater fire resistance as there is less danger of the concrete spalling and exposing the reinforcement.

Deflection requirements will generally govern slab thickness which should not normally be less than mm for fire resistance as indicated in table 8. The analysis of a flat slab structure may be carried out by dividing the structure into a series of equivalent frames. The moments in these frames may be determined by:.

Get My Free Ebook. Responses Ugo What is a concrete drop panel? Lisa How to use drop panels in concrete construction? Post a comment Name Comment it up Was this article helpful?Wikipedia - Concrete Slab. Select an item from the list on the right to compare related dimensions.

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Concrete floor systems are reinforced slab structures designed to satisfy a range of loading and span conditions in a building. Concrete floor systems are designed to span in either one direction one-way or both directions two-way of a structural bay. A comprehensive reference database of dimensioned drawings documenting the standard measurements and sizes of the everyday objects and spaces that make up our world.

Browse Tags Compare About Categories. X Login. Browse Tags Convert About. Humans Animals Plants. Furniture Fixtures Layouts Buildings. Transport Sports Digital Pop Culture. Related Collections Concrete Floor Systems. Tags Construction. Text by. DWG - Imperial Feet. DWG - Metric Meters. Guide Pro Membership. Ad Blocker.

flat slab drop panel size

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Advertising helps fund our work. Please support the project by disabling or whitelisting your ad blocker while browsing Dimensions. Use our Size Comparison calculator to compare the dimensional properties of Two-Way Concrete Flat Slab with other related elements from our database. One-Way Concrete Band Slab. One-Way Concrete Joist Slab. One-Way Concrete Solid Slab.

Two-Way Concrete Flat Plate. Two-Way Concrete Waffle Slab. Concrete Floor Systems. DWG FT. DWG M. Two-Way Concrete Flat Slab. Handrails - Utility Ramps. Bypass Sliding Doors Door Operation. Circular Stairs Stairs. Interlocking Joints Joints Connections.

Ramp - Switchback Ramps. Hardware Locations Door Hardware. Split Bifurcated Stairs Stairs.Drop panels act as T-beams over the supports. They increase the shear capacity and the stiffness of the floor system under vertical loadsthus increasing the economical span range.

This form of construction has become less popular in recent years because of the limit on economical spans of about 9. Reinforced flat slabs may need to be sensibly pre-cambered not overdone to control deflection. The overall depth of the drop panel is typically taken as 1. The principal features of a flat slab floor are a flat soffit, simple formwork and easy construction. Prestressing the slab increases the economical span to D x 35, D x 40 and D x 45 respectively, where D is the depth of the slab excluding the drop panel.

Various Flat Slab Systems.

flat slab drop panel size

Advantages and Disadvantages of Flat Slabs. Flat Slab Floor System. Posted by Anand Paul. Tags: advantages of flat slabsbenefits of flat slab designflat plate slabflat plate slab designflat slab analysisflat slab constructionflat slab definitionflat slab floor systemflat slab spanflat slab subductionflat slab vs flat platetwo-way slabvoided flat slab system. Related Articles.

What is Punching Shear? Punching Shear in Flat Slabs.The lateral loads are independently resisted by shear walls. The use of flat plate system will be checked. If the use of flat plate is not adequate, the use of flat slab system with drop panels will be investigated. Flat slab concrete floor system is similar to the flat plate system. The only exception is that the flat slab uses drop panels thickened portions around the columns to increase the nominal shear strength of the concrete at the critical section around the columns.

The hand solution from EFM is also used for a detailed comparison with the model results of spSlab engineering software program. Preliminary member sizing. Flexural Analysis and Design.

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Limitations for use of equivalent frame method. Frame members of equivalent frame. Equivalent frame analysis. Factored moments used for Design. Factored moments in slab-beam strip. Flexural reinforcement requirements. Factored moments in columns. Design of Columns by spColumn. Determination of factored loads.

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Moment Interaction Diagram Shear Strength. One-Way Beam action Shear Strength. At distance d from the supporting column.

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At the face of the drop panel Two-Way Punching Shear Strength. Around the columns faces. Serviceability Requirements Deflection Check Immediate Instantaneous Deflections. Summary and Comparison of Design Results. Kamara and Lawrence C. Design Data.Log In. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action. Click Here to join Eng-Tips and talk with other members! Already a Member?

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flat slab drop panel size

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Basic of Drop Panel in Flat Slab & Determination of Size

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Students Click Here. Related Projects. Thank you. It is just an arbitrary dimension that has been found by experience to work well. Don't make drop panels eccentric PCA notes is just trying to make the code language clearer. They must be assuming the same span in each direction. For each direction, I would use the average of the spans either side of the column in that direction. And if they are relatively close for all columns, use the largest value for the floor for all columns.

As Hokie said. You are talking about an irrelevantly small amount of concrete to have the potential problems noted by previous posters. You should probably be limiting the variation in span to reasonable numbers anyway. Red Flag This Post Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. This includes challenging trends on contractors and distributors like new refrigerants, growing automation, complex sensors and monitoring, green initiatives and a technician shortage.

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Students Click Here Join Us!It is important to note that these limitations do not apply for prestressed slabs, which allows the designer tremendous flexibility in sizing drop panels to increase negative moment capacity and reduce non-prestressed reinforcement over the columns.

We recommend that the depth of the drop below the slab soffit be at least 4 in. The depth of the drop should be increased if required to increased punching shear capacity. I further recommend using a minimum drop panel size of 4 x 4 ft in plan.

The size of the drop should be increased if necessary to increase flexural or punching shear capacity and fit shear reinforcement within the dimensions of the drop. If you have any questions as you size your drop panels, consult an expert! Reference: Bondy, K. Structural Design. Construction Services.

flat slab drop panel size

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How can a slab be defined with a drop panel?

Our Team. What We Stand For. Community Support. Our Clients. Knowledge Center. Post-Tensioning Calculator. January 13, Most engineers are familiar with the limitations on the size of drop panels in two-way non-prestressed slabs. ACISection 8. Newer Post Everything you need to know about building with concrete podium slabs. Older Post Rules for Average Prestress.

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