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Reinforced Concrete Flat Slab per. Eurocode 2

Precision:

Input- Insert the dimensions of the slab span and section, loads with their respective safety factors and material properties of the concrete and the reinforcement steel.

Slab span
Span direction	Span length
X direction (lx)		m
Y direction (ly)		m
Adjacent span in x axis		m
Adjacent span in y axis		m
Adjacent span should be greater than 0.85ly

 

Section
Slab depth (h)		m
Column dimensions (x,y)		m
		m
Concrete cover		m
Punching shear design
Column position	Corner column Edge column Internal column

 

Load
Dead load		kN/m2
Live load		kN/m2
Material
Concrete grade	C20/25 C25/30 C30/37 C35/45 C40/50 C45/55 C50/60
Flexural and shear rebar grade	S255 S300 S500 S255 S300 S500
Flexural and shear rebar size	∅8 ∅10 ∅12 ∅14 ∅16 ∅20 ∅25 ∅32 ∅40 ∅8 ∅10 ∅12 ∅14 ∅16 ∅20 ∅25 ∅32 ∅40

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Design for flexure I am aware of the slab design is based on the concise Eurocode 2, Concise Table 15.3. According to Eurocode, the ratio of the adjacent span and design span is greater than 0.85 and the live load must be less than or equal to the dead load in order to use the coefficient method design from the Concise Table 15.3.

Output results - This will design a reinforced concrete flat slab for flexure and shear in the tables below from the design input data in the table above.

Design spans
Column strip width		m	Middle strip		m
Design moments
Sagging moment		kN-m	Column strip		kNm/m
			Middle strip		kNm/m
Hogging moment		kN-m	Column strip		kNm/m
			Middle strip		kNm/m

 

Analysis
Design values	Sagging moment				Hogging moment
	Column strip		Middle strip		Column Strip		Middle strip
K value
Required steel area (As)		mm2/m		mm2/m		mm2/m		mm2/m
Bar spacing		mm		mm		mm		mm
Provided steel area (As)		mm2/m		mm2/m		mm2/m		mm2/m

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Calculate Design for shear

Shear design values
Reaction force at the column (VED)		kN
Design shear stress at the face of the column (vED)		MPa
Concrete maximum shear strength (vRd,max)		MPa
Design shear stress at the control perimeter u1 (vED)		MPa
Concrete shear resistance (vRd,c)		MPa
Punching shear reinf. per perimeter (Asw)		mm2
No of punching shear reinf. provided (n)
Punching shear resistance with shear reinf. (vRd,cs)		MPa
Outer perimeter where shear reinf. not required (uout,ef)		m
Radius from the column face to the outer perimeter (r)		m

Equation used for Flat slab design Flexure design Column

Source:

Alazar Woldeyohannes
Master's program in Structural Engineering in the School of Mechanical, Aerospace and Civil Engineering
University of Manchester
Email available on request

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