AS3600 2018 code specific items for slabs

Sections considered

AS3600-2018 Concrete Structures Code (incorporating amendment 1)

SECTION 1 SCOPE AND GENERAL

1.1 SCOPE AND APPLICATION

1.1.2 Application

(a)(i)

SECTION 2 DESIGN PROCEDURES, ACTIONS AND LOADS

2.2 DESIGN FOR STRENGTH

2.2. Strength check procedure for use with linear elastic methods of analysis

(ii) Table 2.2.2

2.3 DESIGN FOR SERVICEABILITY

2.3.2. Deflection

SECTION 3 DESIGN PROPERTIES OF MATERIALS

3.1 PROPERTIES OF CONCRETE

3.1.1 Strength

3.1.1.1 Characteristic compressive strength

(a)

3.1.1.3 Tensile strength

3.1.2 Modulus of elasticity

3.1.4 Stress-strain curve

(a)

3.1.7 Shrinkage (Used in deflection calculation)

3.1.7.1 Calculation of design shrinkage strain

(c)

3.1.7.2 Design shrinkage strain

3.1.8 Creep (Used in deflection calculation)

3.2 PROPERTIES OF REINFORCEMENT

3.2.2 Modulus of elasticity

(a)

SECTION 6 METHODS OF STRUCTURAL ANALYSIS

6.2 LINEAR ELASTIC ANALYSIS

6.2.3 Critical sections for negative moments (optional)

6.2.7 Moment redistribution in reinforced and prestressed members for strength design

SPACE GASS has options for moment redistribution in slab strips, however you must be responsible for code compliance with Clause 6.2.7.

SECTION 8 DESIGN OF BEAMS FOR STRENGTH AND SERVICEABILITY

8.1 STRENGTH OF BEAMS ON BENDING

8.1.1 General

8.1.2 Basis of strength calculations

8.1.3 Rectangular stress block

8.1.6 Minimum strength requirements

8.1.6.1 General

8.1.9 Spacing of reinforcement and tendons

8.2 STRENGTH OF BEAMS IN SHEAR (strip method only)

8.2.1 General

8.2.1.1 Combined flexure, torsion and shear

8.2.1.2 Consideration of torsion

(b) For solid section

8.2.1.6 Requirements for transverse shear reinforcement

8.2.1.7 Minimum transverse shear reinforcement

8.2.1.9 Effective shear depth

8.2.3 Sectional design of a beam

8.2.3.1 Design shear strength of a beam

8.2.3.2 Maximum transverse shear near a support

8.2.3.3 Shear strength limited by web crushing

8.2.3.4 Combined shear and torsion strength limited by web crushing

(b) Other section

8.2.4 Concrete contribution to shear strength (Vuc)

8.2.4.1 General

8.2.4.2 Determination of kv and ɵv (general method)

8.2.4.3 Determination of kv and ɵv for non-prestressed component (simplified method)

8.2.4.5 Reversal of loads (the users can set Vuc = 0 if desired)

8.2.5 Transverse shear reinforcement contribution (Vus)

8.2.7 Additional longitudinal tension forces caused by shear

8.2.8 Proportioning longitudinal reinforcement

8.2.8.1 General

8.2.8.2 Flexural tension side

This clause is deemed to being satisfied by extending the flexure tensile reinforcement as in Figure 8.2.8. SPACE GASS automatically uses bottom reinforcement throughout the entire span, thus complying with this clause.

8.2.8.3 Flexural compression side

SECTION 9 DESIGN OF SLABS FOR STRENGTH AND SERVICEABILITY

9.1 STRENGTH OF SLABS IN BENDING

9.1.1 General

9.1.3 Detailing of tensile reinforcement in slabs

9.1.3.3 Deemed to conform arrangement for two-way slabs supported on beams or walls

9.1.3.4 Deemed to conform arrangement for two-way flat slabs

9.3 STRENGTH OF SLABS IN SHEAR

9.3.1 Definitions and symbols

9.3.1.1 Effective area of a support or concentrated load

9.3.1.2 Critical opening

9.3.1.3 Critical shear perimeter

9.3.2 Strength

9.3.3 Ultimate shear strength where Mv* is zero

9.3.4 Ultimate shear strength where Mv* is not zero

(a)

9.4 DEFLECTION OF SLABS

9.4.1 General

9.4.2 Slab deflection by refined calculation (strip method only)

9.4.4 Deemed to conform span-to-depth ratio for reinforced slabs (via the separate span-to-depth calculation tool)

9.5 CRACK CONTROL OF SLABS

9.5.1 General requirements for reinforced concrete slabs

(a) (b)

9.5.2 Crack control for flexure in reinforced slabs

9.5.2.1 Crack control without direct calculation of crack widths

SPACE GASS does not check code compliance to Table 9.5.2.1(A) or (B), however you can set a threshold stress and SG will check if the tensile steel stress under serviceability load cases exceeds the limit.

9.5.3 Crack control for shrinkage and temperature

9.5.3.3 Reinforcement in the secondary direction in unrestrained slabs

9.5.3.4 Reinforcement in the secondary direction in restrained slabs

SECTION 14 DESIGN FOR EARTHQUAKE ACTIONS

14.5 INTERMEDIATE MOMENT-RESISTING FRAMES (IMFRs)

14.5.3 Slabs

14.5.3.2 reinforcement detailing if flat slabs

(d) (e)

Assumptions

The serviceability and deflection checks do not affect the reinforcement design, however they will generate warnings or error messages if they are not satisfied.

Clause 3.1.1.3 - f'ct.f is taken as 0.6(f'c)^0.5.

Clause 3.1.2 - Ec is taken from Table 3.1.2 for standard f'c values, where f'c is taken from the material properties of the member in the SPACE GASS model. For non-standard f'c values, Ec is taken from the material properties of the member in the SPACE GASS model.

fsy and reinforcement ductility is taken from the SPACE GASS reinforcing bar library. If the section contains a mixture of bars with different fsy and ductility values, the fsy and ductility of the first bar on the bottom layer is used.

Clause 6.2.3 - Optional preference to reduce maximum negative bending moment at support.

Clause 8.2.4.5 - A zone setting is provided to set Vuc to zero, otherwise Vuc will be calculated as per normal code requirements.

Clause 8.2.1.2 - Closed fitments are assumed if torsion is to be considered. Only a spacing check is performed.