Flat slabs

A procedure for carrying out the detailed design of flat slabs is shown in Table 1 below.

This assumes that the slab thickness has previously been determined during conceptual design. Concept designs prepared assuming detailed design would be to BS 8110 may be continued through to detailed design using Eurocode 2.

More detailed advice on determining design life, loading, material properties, methods of analysis, minimum concrete cover for durability and bond, and control of crack widths can be found in Chapter 2 of如何设计混凝土结构使用Eurocode 2.

Table 1: Flat slab design procedure

Task	Further guidance
	Publication	Standard
Determine design life	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting started	NA to BS EN 1990 Table NA.2.1
Assess actions on the slab	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting started	BS EN 1991 (10 parts) and National Annexes
Determine which combinations of actions apply	How to Design Concrete Structures to Eurocode 2 - Chapter 1:Introduction to Eurocodes	NA to BS EN 1990 Tables NA.A1.1 and NA.A1.2 (B)
Determine loading arrangements	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting started	NA to BS EN 1992–1–1
Assess durability requirements and determine concrete strength	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting started	BS 8500:2006
Check cover requirements for appropriate fire resistance period	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting startedand Table 2	Approved Document B. BS EN 1992–1–2: Section 5
Calculate min. cover for durability, fire and bond requirements	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting started	BS EN 1992–1–1 Cl 4.4.1
Analyse structure to obtain critical moments and shear forces.	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting startedand Table 3	BS EN 1992–1–1 section 5
Design flexural reinforcement for column strips and middle strips both ways. Design for full load in both directions.	How to Design Concrete Structures to Eurocode 2 - Chapter 7:Flat slabs和图1	BS EN 1992–1–1 section 6.1, Annex I
Check deflection	How to Design Concrete Structures to Eurocode 2 - Chapter 7 :Flat slabsand Figure 3	BS EN 1992–1–1 section 7.4
Check punching shear capacity	How to Design Concrete Structures to Eurocode 2 - Chapter 7 :Flat slabsand Figure 6	BS EN 1992–1–1 section 6.4
Check spacing of bars	How to Design Concrete Structures to Eurocode 2 - Chapter 2:Getting started	BS EN 1992–1–1 section 7.3
Check resistance to moment transfer from column to slab		BS EN 1992-1-1 Annex 1 1.2(5)

Further guidance is given inConcrete Society Technical Report No 64: Guide to the Design and Construction of Reinforced Concrete Flat Slabs.

Related links

Flat slabs

Table 1: Flat slab design procedure

如何设计混凝土结构使用Eurocode 2: Second edition