Copyright 2025 by Space Gass Pty Ltd
Space Gass Version 14.25
Sections considered
IS456:2000 Plain and Reinforced Concrete Code of Practice (Fourth Revision 2005)
If crack control to IS3370 (Part 2) Annex B is specified then additional IS3370 sections are considered as listed below.
SECTION 2 MATERIALS, WORKMANSHIP, INSPECTION AND TESTING
5 MATERIALS
5.3 Aggregates
5.3.3 Size of Aggregate
6 CONCRETE
6.2 Properties of Concrete
6.2.2 Tensile Strength of Concrete
6.2.3 Elastic Deformation
6.2.4 Shrinkage
6.2.5 Creep of Concrete
6.2.5.1 (Creep Coefficient)
SECTION 3 GENERAL DESIGN CONSIDERATION
22 ANALYSIS
22.1 General
22.2 Effective Span
22.3 Relative stiffness
23 BEAMS
23.2 Control of deflection (via the separate span-to-depth calculation tool)
26 REQUIREMENTS GOVERNING REINFORCEMENT AND DETAILING
26.3 Spacing of reinforcement
26.3.3 Maximum Distance Between Bars in Tension
(b) Slabs
26.4 Nominal Cover to Reinforcement
26.4.3 Nominal Cover to Meet Specified Period of Fire Resistance
26.5 Requirements of Reinforcement for Structural Members
26.5.1 Beams
26.5.1.1 Tension Reinforcement
26.5.1.2 Compression Reinforcement
26.5.1.5 Maximum Spacing of Shear Reinforcement
26.5.1.6 Minimum Shear Reinforcement
26.5.1.7 Distribution of Torsion Reinforcement
26.5.2 Slabs
26.5.2.1 Minimum reinforcement
SECTION 4 SPECIAL DESIGN REQUIREMENTS FOR STRUCTURAL MEMBERS AND SYSTEMS
31 FLAT SLABS
31.6 Shear in Flat Slab
31.7 Slab Reinforcement
31.7.1 Spacing
31.7.2 Area of reinforcement
(a) (if you opt to use thickenings)
SECTION 5 STRUCTURAL DESIGN (LIMIT STATE METHOD)
37 ANALYSIS
37.1 Analysis of Structure
37.1.1 Redistribution of Moments in Continuous Beams and Frames
38 LIMIT STATE OF COLLAPSE: FLEXURE
38.1 Assumptions
40 LIMIT STATE OF COLLAPSE: SHEAR
40.2 Design Shear Strength of Concrete
40.2.1 Beams
40.3 Minimum Shear Reinforcement
40.4 Design of Shear Reinforcement
41 TORSION
41.1 General
41.2 Critical Section
41.3 Shear and Torsion
41.4 Reinforcement in Members Subjected to Torsion
43 LIMIT STATE OF SERVICEABILITY: CRACKING
43.1 Flexural Members
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 5.3.3 - Size of aggregate: The default aggregate size is 20 mm, but you can change the value in the general preferences.
Clause 6.2.5.1 - Creep coefficient: There are options for creep coefficients.
Clause 22.2 - Effective span is assumed to be centre-to-centre between supports.
Clause 22.6 - Critical sections for moment and shear: You have the option to take the moment and shear at the face of the support or at a user-defined distance from the face of the support.
Clause 26.3.2c - The requirement for vertical spacing between layers of reinforcement is not checked.
Clause 26.5.1.3 - The side face reinforcement for crack control is not checked.
Clause 38.1c - A rectangular stress block is assumed:
The uniform stress level = 0.4 * fck (Ref: P.C. Varghese, "Limit State Design of Reinforced Concrete", Second Edition, Chapter 5).
The depth of the stress block is to the neutral axis.
The uniform stress level already includes the partial safety factor 1.5 for concrete.
The design compressive strength of concrete = 0.66 of the characteristic strength of concrete.
Clause 41 - Torsion: Closed fitments are assumed if torsion is to be considered. If there is torsion, the actions (V* and M*) have been increased based on the code requirements to take into account the torsion effects.
IS3370:2009 (Part 2)
Annex B: Crack width in mature concrete
Used if crack control is set to IS3370 (Part 2) Annex B.
Copyright 2025 by Space Gass Pty Ltd
Space Gass Version 14.25