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  Topic: Rechargeable cement-based batteries
Dr. N. Subramanian

Replies: 1
Views: 346

PostForum: SEFI General Discussion   Posted: Thu Jun 03, 2021 6:42 pm   Subject: Rechargeable cement-based batteries


Rechargeable cement-based batteries


Imagine an entire twenty storey concrete building which can store energy like a giant battery. Thanks to unique research from Chalmers University of Techno ...
  Topic: Is taking Average stress, where there is stress concentration, is safe?
Dr. N. Subramanian

Replies: 1
Views: 405

PostForum: SEFI General Discussion   Posted: Thu Jun 03, 2021 6:00 pm   Subject: Is taking Average stress, where there is stress concentration, is safe?
An engineer asked a question recently:
I have a doubt. In office we have decided to average stresses in case it gets concentrated at certain location. So for averaging we take the value of an area wi ...
  Topic: When to consider pinned base for Portal frames
Dr. N. Subramanian

Replies: 9
Views: 778

PostForum: SEFI General Discussion   Posted: Wed May 26, 2021 7:41 pm   Subject: When to consider pinned base for Portal frames
Dear All,

When I read further, in section 11.3.1, I found the following figure for nominally pinned bases, which is better than the earlier figure, as the exact locations of anchors in base plate a ...
  Topic: When to consider pinned base for Portal frames
Dr. N. Subramanian

Replies: 9
Views: 778

PostForum: SEFI General Discussion   Posted: Wed May 26, 2021 3:20 pm   Subject: When to consider pinned base for Portal frames
Dear Er Jayakumar


More than 2 bolts in a row can be assumed as fixed connection. In fact according to me, the connection shown in the figure will have some fixity, which will be advantageous for ...
  Topic: When to consider pinned base for Portal frames
Dr. N. Subramanian

Replies: 9
Views: 778

PostForum: SEFI General Discussion   Posted: Wed May 26, 2021 12:27 pm   Subject: When to consider pinned base for Portal frames
Dear All,


We had several discussions on when to consider pinned base for Portal frames. I just saw an illustration in SCI P 399 regarding this and I am giving it for the benefit of designers:
...
  Topic: Maximum Size of Fillet Weld for T-joints
Dr. N. Subramanian

Replies: 5
Views: 1190

PostForum: SEFI General Discussion   Posted: Thu Apr 22, 2021 6:17 pm   Subject: Maximum Size of Fillet Weld for T-joints
Maximum Size of Fillet Weld for T-joints

My Reply:
There is NO max size of fillet weld for a T-joint, to AWS and AISC specifications.

The max fillet weld rules are for 'edges' - so that the edg ...
  Topic: Leslie E. Robertson, structural engineer of the World Trade Center, passes away at 92
Dr. N. Subramanian

Replies: 0
Views: 1203

PostForum: Engineering Marvels   Posted: Wed Apr 07, 2021 9:08 pm   Subject: Leslie E. Robertson, structural engineer of the World Trade Center, passes away at 92
Leslie E. Robertson, structural engineer of the World Trade Center, passes away at 92
https://assets.archpaper.com/wp-content/uploads/2021/02/Leslie-Robertson.jpg
Leslie Earl Robertson, 19282021
P ...
  Topic: High Strength Friction Grip (HSFG) Bolted connections
Dr. N. Subramanian

Replies: 2
Views: 704

PostForum: SEFI General Discussion   Posted: Thu Apr 01, 2021 2:41 pm   Subject: Re: High Strength Friction Grip (HSFG) Bolted connections
Where can I find guidelines for the design of structural steel bolted connections using HSFG bolts?
Dear Er. Damodara Bhat

There is a BIS handbook on HSFG bolts.

Best wishes
Subramanian
  Topic: Column Design in STAAD Pro.
Dr. N. Subramanian

Replies: 7
Views: 1891

PostForum: SEFI General Discussion   Posted: Sun Mar 28, 2021 10:26 pm   Subject: Column Design in STAAD Pro.
Dear Er Vikramjeet

Thank you for the kind words. Many engineers were benefitted by your comments, which were always practice oriented. Happy to note that you have come back and looking for forward ...
  Topic: Column Design in STAAD Pro.
Dr. N. Subramanian

Replies: 7
Views: 1891

PostForum: SEFI General Discussion   Posted: Sat Mar 27, 2021 7:03 pm   Subject: Column Design in STAAD Pro.
Dear Er
I think if end cols require higher reinf either increase the size or apply redistribution clause for gravity loadings only . If internal cols, then increase mix, or size of col. Moments at ...
 
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