www.sefindia.org

STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

 Forum SubscriptionsSubscriptions DigestDigest Preferences   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups  RegisterRegister FAQSecurity Tips FAQDonate
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log in to websiteLog in to websiteLog in to websiteLog in to forum 
Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.

Additional Longitudinal Reinforcement requirement due to Shear

 
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion
View previous topic :: View next topic  
Author Message
diwakark
SEFI Member
SEFI Member


Joined: 21 Jan 2009
Posts: 1

PostPosted: Fri Oct 13, 2023 5:25 am    Post subject: Additional Longitudinal Reinforcement requirement due to Shear Reply with quote

Hi All,Currently, we are referring the guidelines of CSAA23.3:19 (Canadian code for RCC design) for designing a metro station. In Cl.11.3.9, code suggest considering additional longitudinal reinforcement due to presenceof shear force (Eq. 11.14) in beams & slabs. But it also highlights that ifmember is not subjected to significant torsion & significant tensionforces, this requirement can be satisfied by extending the flexural tensionreinforcement by distance dv cot θ. Here, code has not provided the exact definition/value ofsignificant tension & significant torsion?Can anyone please elaborate it further, where we have to provide additionallongitudinal reinforcement due to shear and where only dv cot θ extension issufficient?


Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.
Clauses.pdf
 Description:

Download
 Filename:  Clauses.pdf
 Filesize:  304.86 KB
 Downloaded:  158 Time(s)

Back to top
View user's profile Send private message
vikram.jeet
General Sponsor
General Sponsor


Joined: 26 Jan 2003
Posts: 3834

PostPosted: Sat Oct 14, 2023 4:26 am    Post subject: Reply with quote

Two types of torsions emerge from structural arrangements,,
1) Compatibility Torsion
A secondary beam supported by main beam/s,,
Here since there is partial fixity at ends,, the edge moments of partial fixity from sec beam get transfered to main beam as torsion *. This is Compatibility torsion, if secondary beam is designed as simply supported,,  this torsion is generally taken care while detailing of main beam. As per IS 456 , minimum shear reinf is suffice to take care of such torsionsl cracking.

2) Equilibrium Torsion  :- But if sec beam ends are taken fully monolithic,, the torsion created in main beam needs to be treated as equilibrium torsion and main beam needs to be designed with torsion reinf. Also a cantilever beam emerging
from Mainbeam will transfer entire cantilever moment to main beam as Equilibrium torsion and there is no option to avoid this torsion.

Additional reinf in form of longitudinsl bars on tension reinf plus longitudinal bars of skin reinf  plus additional stirrups reqd if Equilibrium torsion exist.

Compatibility torsion :- tackled in Detailing
(Just personal view)
Stirrups :- shear reinf worked out without considering Tcbd reilef
Skin reinf :- provide 0.1 percent of x sec area

Some views are personal and can be ignored
Back to top
View user's profile Send private message
vikram.jeet
General Sponsor
General Sponsor


Joined: 26 Jan 2003
Posts: 3834

PostPosted: Sat Oct 14, 2023 4:40 am    Post subject: Reply with quote

* Torsion on main beam due to fixity moment from sec beam

This can be worked out by distributing end moment from main beam based on flexural stiffness of sec beam and torsional stiffness of main beam parts on either side of sec beam junction.

However in software, readily available
Back to top
View user's profile Send private message
vikram.jeet
General Sponsor
General Sponsor


Joined: 26 Jan 2003
Posts: 3834

PostPosted: Sat Oct 14, 2023 4:46 am    Post subject: Reply with quote

But if u are working as per Canadian codes,, need to follow country code,

Generally I reiterate :

ANALYSIS IS UNIVERSAL
DESIGN IS NATIONAL
DETAILING IS PERSONAL
&
MODELLING HAS TO BE IDEAL
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion All times are GMT
Page 1 of 1

 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


© 2003, 2008 SEFINDIA, Indian Domain Registration
Publishing or acceptance of an advertisement is neither a guarantee nor endorsement of the advertiser's product or service. advertisement policy