REQUIREMENTS GOVERNING REINFORCEMENT AND DETAILING

General :-
Reinforcing steelof sametypeand grade shall be used
as main reinforcement in a structural member.
However.simultaneous use of two different types or
grades of steel for main and secondary reinforcement
respectively is permissiblte.

Bars may be arranged singly. or in pairs in
contact, or in groups of three or four bars bundled in
contact. Bundledbarsshallbeenclosedwithinstirrups
or ties. Bundled bars shall be tied together to ensure
the bars remaining together. Bars larger than 32 mm
diametershall not be bundled. except in columns.


The recommendations for detailing for
earthquake-resistant construction given in IS 13920
should be taken into consideration, where applicable
(see also IS 4326).

Development of Stress in Reinforcement

The calculated tension or compression in any bar at

any section shall be developed on each side of the

section by an appropriate developmentlength or end

anchorage or by a combination thereof.

Development Length ofBars

The development lengthLd is given by

L _ ,a. (1---

4fbd

whereL= nominaldiameter of the bar,

a =stressinbaratthe sectionconsideredat design

load, and

t hd =design bond stress given in 26.Z.1.1.

NOTES

1 The development IcnJlhincludca anchomae vDlues of hooks

in tension reinforcement.

2 For bars of sections otherthan cireular. the development

lenathshould be sufficient to develop the stras in the bar