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During construction , why do we add steel reinforcement in concrete columns, when columns are always subjected to compression ?

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تم إضافة السؤال من قبل Ahmed Hossam Gomoah , Project Management Office (PMO) Section Head , Integrated Solutions Consultancy
تاريخ النشر: 2016/03/22
suliman aljarboua aljarboua
من قبل suliman aljarboua aljarboua , مهندس موقع , المجموعة المشتركة

You can not perform columns without minimum reinforcing at least, because the collapse of the  concrete is sudden  collapse (without indicators) therefore is added rebar so that gives us a warning that the column began to collapse

Because the steel also resists compression,

During the course of the study pivots

There are areas with compressed steels

Tom Bau
من قبل Tom Bau , eee , tre

but still even when we take a purely centric loaded column.  With absolutely no moments.

Why can't we have the column then without reinforcement?  

Reinforcement is meant for TENSION forces only, or?  

How comes that you still fine in a column the rebars staying under compression.

Otherwise why would we need the stirrups around them if they would be in tension only?

 

Somehow it appears to be the we need the stirrups (links) becasue the bars are getting compressed? 

Strange....

 

Often you see horizontal cracks in columns at the spots where the crank is (overlapping) because hte bar got compressed there, why?

 

 

links

nawar alhakeem
من قبل nawar alhakeem , مدير مشروع , الظافر للمقاولات

Increase streghth , buckling , connection to other elements , and all horizontal forces like wind & earthquakes affect on all building inculuding columns so there is tension because of moment.also concrete not enough for compression so with steel  kind of cost.

 

ali alzbet
من قبل ali alzbet , Site Engineer (Structural) , البداية للمقاولات

To prevent brittle failure*

To resist the moment due to eccentricity *

To reduce the section area of column*

 

marco farah ghattas
من قبل marco farah ghattas , Civil Engineer , Qatar Power Construction

all horizontal forces like wind & earthquakes affect on all building inculuding columns so there is tension because of moment.

also concrete not enough for compression so with steel  kind of cost.

other reason transfering load .

mohamed el banna
من قبل mohamed el banna , PROJECT MANAGER , DIG

Increase streghth , buckling , connection to other elements , transfer forces to all clo.

R MANESH RAVEENDRAN NAIR
من قبل R MANESH RAVEENDRAN NAIR , site engineer( job performer) , NASAR SAID AL HAJRI

the tensile streth of steel will transfer to concrete

amr nabil
من قبل amr nabil , Construction Manager , Samco national construction company

although columns are compression members , They are also subjected to bending moment when connected with beams ( it can be distributed by stiffness ratios between column and connected beams by frame method analysis ). Also if the column is long column it is subjected to additional moment .  

riadh zemzem
من قبل riadh zemzem , conception et calcul des structures en béton armé , B.I.E.S.CO

we add steel reinforcement in concrete columns, when columns are always subjected to compression to support the efforts of thermal expansion and buckling

TOMMY ESCOBIDO
من قبل TOMMY ESCOBIDO , Qa/ Qc Engineer , Arabtec Construction., LLC

Because column is subject  also for other forces such laterall, bending,buckling.

 

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