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rehab code comments

 
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acpl_sefi
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Joined: 26 Jan 2003
Posts: 63

PostPosted: Thu Aug 12, 2004 7:07 pm    Post subject: rehab code comments Reply with quote

The rehab draft code (IITK-GSDMA-EQ06-V3.0) is a step in the right direction. A lot of it of course smells of US codes like FEMA etc. Only it needs to be further “Indianised” in parts (Wall anchorage to a timber frame roof -- Fig C28 being case & point). Such clauses may be irrelevant in the Indian scenario. In fact this detail belongs to the category of a flexible diaphragm, whereas it appears under the clause for “stiff” diaphragms (Sec 7.4.3)  

The definitions of all technical terms used in the code should be included in Sec 3, such as Captive Columns, Chords, Collectors, drag strut etc.

Sec 3.5: The term Column Jacketing should include composite fibres (Glass or Carbon wraps). Also applies to Sec 8.5.1.4.

Sec. 8.5.1.4—Fig3: Shows welding of bars. It is common knowledge that welding of “Tor” steel is discouraged as it leads to brittleness. This detail will give a clean chit to anyone wanting to weld rebar. Instead chemical anchors into existing concrete may be considered.
The connection of jacket to the top beam is tricky & should also be illustrated

Sec 8.5.2.2 talks about steel braces used to retrofit RCC frames but the detail of Fig 5 shows a welded connection to the “RCC frame”.

Confinement of the connections should be addressed along with jacketing.
Limitation of Glass & Carbon wraps such as heat tolerance. Effectiveness of Glass & Carbon wraps in confining rectangular columns etc. must also be addressed.

More later…

Vipul Ahuja

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ishacon1
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Joined: 26 Jan 2003
Posts: 52

PostPosted: Sun Aug 15, 2004 4:58 am    Post subject: rehab code comments Reply with quote

The Draft code EQ006 was a necessity since long but do we not need to
first get some teeth in the system where people including practicing
structural engineers continue to ignore the codal provisions of the latest
codes.
An urgent need is get the NBC duly revised with appropriate punitive
clauses.

Of course this first draft needs to be further polished up as had been
discussed
during the Disaster Management seminar held in Delhi under UNDP program.
However we need not follow blindly the provisions of FEMA which have
little or no bearing
on the Indian conditions, like timber structures.
Welding of rebars in existing structures should be a criminal offence and
not even
form a part of the recommended rehab/ repair procedure.
As such we have welders who
are "experts" only in producing grills and door - window frames etc and if
they get
the task to rebar welding, GOD help us !

Comments please.

V.P.Agarwal
ishacon@vsnl.net

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