Answer / sjtbehera

in a slabs the shorter sapn is to be consider design.so the
main bar is kept lower and longer direction are bar is to
kept bind to main reinforcement.
Main bars are designed to load the bending moment, super
imposed laod and stress develop. the distribution bar are
distribute of stress caused by the super imposed laod,
tempreature variation and shirnkage.

Answer / t.panneer selvam

Because Bending Moment develope in shoter direction

Answer / rajesh ghyar, global group

For one way slab, short span is considered in the design of
slab. So the main reif. are provinding along the short span

Answer / vinod

Maximum bending of a slab takes place along the long span
only. Hence if the reinforcement is placed across the long
span, this moment will be counteracted. If this moment is
nullified, the other direction moment also will be
nullified. Hence minimum reinforcement will be sufficient
for the other direction moment.

Answer / kiriinya kevin

Depends on the moments like in staircase the reiforcement
bars ran in the long span

Answer / aung myat thu

in one way slabs, one direction loading slabs, deflection as well as bending moment is critical or significant in shorter direction because of nature. Just think about, the delfection of Rectangular thin paper(i.e, one way load dustribution). That's why, shorter direction is the main steel.

Answer / anish

Bending moment of shorter span is smaller then the longer span...The reinforcement is provided based on bending moment.....If we provide main rod at longer span we need to provide more reinforcement ,when we compare to the shorter span.....so we provide reinforcement at shorter span as main rod...........I think so............

Answer / anwar

THE MOMENT OF INERTIA OF SHORTER SPAN IS LESS THAN ITS
LONGER SPAN,SLAB ALWAYS FAILS IN ITS SHORTER DIRECTION DATS
WHY WE PROVIDE MAIN REINFORCEMENT IN SHORTER SPAN.

Answer / ajayleo

in one way slab load carries only in shorter span..but in two way slab its carries both the directin..while we r fixing the main bar in shorter span.its will transmit the load and retain the bending moment...

Answer / ganesh

Bending moment is more on longer span of the slab when compared on shorter span. Since B.M. is directly proportional to length main steel is provided on the shorter span of the slab.

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