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.

Direction and frequency of seismic forces

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004
View previous topic :: View next topic  
Author Message
dhirendrat
General Sponsor
General Sponsor


Joined: 02 Apr 2008
Posts: 24

PostPosted: Wed Oct 27, 2004 5:07 am    Post subject: Direction and frequency of seismic forces Reply with quote

Namaste All,

In the seismic zonation is there any information made
available on the likelihood of the direction in which the
horizontal component of the seismic forces  will occur in
the event of an earthquake, for a particular location?

In the Gujarat earthquake of 2001 at first the building I
live in at Ahmedabad shook in vertical direction, with the
floor moving up and down. This was followed by swaying of
the building in the east west direction. The swaying was for
a longer time.

I expect the engineering and of the building would have
contributed to its response. However I also sense a
possibility that the horizontal component of the  seismic
forces was primarily in one direction. Is this correct?

In general buildings would have differing ability to
withstand forces acting in different directions.

If there are sound reasons to base a prediction of the
direction of the seismic forces along with their likely
magnitude then buildings could be oriented so as have the
maximum strength of the structure in the most likely
direction of the seismic forces.

Maybe if more detailed information is available  then  a set
of directions with corresponding likelihoods ( probabilities
) could be made available.

Of course there are probably other "compelling" reasons for
the shape and orientation of buildings, yet should seismic
safety  also be a factor for deciding the orientation of a
given shape of a building?

Similarly variation in the frequency of the seismic force
would also elicit varying responses from a given structure.
So are there are sound reasons to predict the likely
frequency of the seismic forces for a given location?

Currently are structural engineers required to submit a
frequency responseanalysis  whilst obtaining clearances, in
India or abroad?

- Dhirendra Tripathi

Posted via Email
Back to top
View user's profile Send private message
b.r.seshasayee at saip...
Guest





PostPosted: Wed Oct 27, 2004 6:58 am    Post subject: Direction and frequency of seismic forces Reply with quote

Dear members
I would like to share the info I know on this.
Actually during an earthquake , acceleration will be in all the three directions but predominantly in the horizontal direction.
It is difficult to exactly predict in which horizontal direction the acceleration will be more , that is why we check the structures independently for the acceleration in the two horizontal direction.
For more info, ICJ can be referred to . ICJ publishes info on earthquake regularly.

-----Original Message-----
Message From  dhirendrat@gmail.com [mailto:dhirendrat@gmail.com]
Sent: Wednesday, October 27, 2004 4:08 PM
To: Seshasayee B.R.
Subject: Direction and frequency of seismic forces


Namaste All,

In the seismic zonation is there any information made
available on the likelihood of the direction in which the
horizontal component of the seismic forces  will occur in
the event of an earthquake, for a particular location?

In the Gujarat earthquake of 2001 at first the building I
live in at Ahmedabad shook in vertical direction, with the
floor moving up and down. This was followed by swaying of
the building in the east west direction. The swaying was for
a longer time.

I expect the engineering and of the building would have
contributed to its response. However I also sense a
possibility that the horizontal component of the  seismic
forces was primarily in one direction. Is this correct?

In general buildings would have differing ability to
withstand forces acting in different directions.

If there are sound reasons to base a prediction of the
direction of the seismic forces along with their likely
magnitude then buildings could be oriented so as have the
maximum strength of the structure in the most likely
direction of the seismic forces.

Maybe if more detailed information is available  then  a set
of directions with corresponding likelihoods ( probabilities
) could be made available.

Of course there are probably other "compelling" reasons for
the shape and orientation of buildings, yet should seismic
safety  also be a factor for deciding the orientation of a
given shape of a building?

Similarly variation in the frequency of the seismic force
would also elicit varying responses from a given structure.
So are there are sound reasons to predict the likely
frequency of the seismic forces for a given location?

Currently are structural engineers required to submit a
frequency responseanalysis  whilst obtaining clearances, in
India or abroad?

- Dhirendra Tripathi

Posted via Email
Back to top
Display posts from previous:   
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004 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 can 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