Slab Settings for Steel

[memorandum]

Hello, We have 4 options in this section. Trapezoidal Sheet Composite, Composite Solid, Concrete Flooring, Metal Flooring 1-Concrete Flooring option has Floor Thickness in the Geometry Section. Let's say this is 10 cm and 250 and 350 are added to the coating and live load sections in the loads section. When we enter the values, does it add 10 cm concrete for the slab thickness. That is, if we say 250 in the loads section and 250 kg from the slab thickness, does the fixed load become 500 automatically. How does it take the value in the slab thickness tab into account? 2-For trapezoidal sheet; Trapezoidal sheet on steel, wicker steel and concrete are placed on it. There is no slip wedge, etc. Which type of flooring should be used? Can it be composite without throwing a slip wedge or is it a concrete floor? Good work.

 

[Emre Kösen]

Hello,

1-There is Slab Thickness in the Geometry Section in our

1-Concrete Floor option. Let's say this is 10 cm and when we enter 250 and 350 values in the coating and live load sections in the loads section, does it add 10 cm concrete for the floor thickness. That is, 250 in the loads section. and if we say from slab thickness (250 kg), does the fixed load become 500 automatically. How does it take the value in the slab thickness tab into account?

The slab constant load is calculated as concrete weight + pavement load. In the attached project, I created a sample reinforced concrete slab with a thickness of 10 cm. The program calculates the floor load acting on the secondary beams of 10.6 kN/m. Calculated by hand: Concrete material used = C 20 concrete weight = 0.1*24.52*8/3 = 6.54 kN/m pavement load = 1.5 * 8/3 = 4 kN/m slab constant load = 10 ,54 kN/m The difference is due to rounding.

2-Trapezoidal sheet on steel, mesh steel and concrete are placed on it. There is no slip wedge, etc. Which type of flooring should this type of flooring be? Can there be compositeness without throwing a slip wedge? Or is it a concrete slab?

Concrete slab and steel beam cannot work together if no slip nails are used. The flooring in this case is concrete flooring. Steel beams are calculated as normal beams, not composite.

 

[memorandum]

Thank you, Mr. Emre. What I am confused about is that we actually use trapezoidal sheet on steel flooring, but we do not use studs. There is. What do you think about this issue. Have we made a safe design before? Sent via iPhone using Tapatalk

 

[Emre Kösen]

Hello, I think you have a question mark because it says "composite flooring" in the program interface. To explain, "composite beam" calculation is made in ideCAD. In this method, galvanized steel sheet acts as a mold. No further calculation is made for this. However, the manufacturing method you mentioned (reinforced concrete on steel trapezoidal sheet) can be used as composite flooring in the literature. In this production, the mechanical bond between the concrete and the steel sheet is provided by indentations on the sheet so that they can work together under the bending effect. Some manufacturers have special sheets suitable for this, for example

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. The design principles of such a flooring are given in the 9th chapter of the Eurocode 4 EN 1994-1-1 standard, but there is no information about such a flooring in the section 12 composite elements section of our regulation (Design, Calculation and Construction Principles of Steel Structures). As for your second question, yes, it is true that according to TS 648, the design is extremely safe. TS 648 is a standard written almost 40 years ago according to the conditions of the time. It uses the safety stress method, not the bearing force, and does not take into account the plastic strength of the elements. It does not cover the dimensioning of delicate cross-section elements. Composite elements have no dimensioning and contain limited information about joints (bolt and weld calculation). Long story short, it is a standard that cannot meet the requirements of the age. In my opinion it should have been updated much earlier. Ultimately, I think we have a modern regulation with the initiative of our esteemed teachers who prepared the regulation and the Ministry of Environment and Urbanization. Hopefully from now on the regulations will be updated more often before they get too old and out of use. Regarding the new regulation, Prof. Dr. Presentation by Bülent Akbaş:

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