Applies To
	Product(s):	STAAD Advanced Concrete Design
	Version(s):	Connect Edition
	Environment:
	Area:	Concrete Design
	Subarea:	General
	Original Author:	Ranjana, Bentley Technical Support Group

QUESTION:

The crack width values of grade beam GB1& GB2 calculated by RCDC are all negative.

SOLUTION :

The -ve value of crack width means the section is uncracked. please refer IS 456 code Annex F.

the marked term is the strain corresponding to a reduction in tensile stress in reinforcement. for computing this the code suggest a reduction in tensile force in reinforcement, equal to the force generated by triangular distribution of tensile stress in concrete

if the above term is higher than the epsilon-1 then epsilon-m is negative denotes the section is uncracked.