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Seismic Retrofitting of Existing Buildings
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VPandya
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PostPosted: Mon May 13, 2013 3:48 pm    Post subject: Seismic Retrofitting of Existing Buildings Reply with quote

Dear Prof. Arc. and Prof. Vaisakhg,

Since IS 1893 is silent on Seismic Evaluation and Seismic Retrofitting of Existing Buildings , can we use some other Industry Respected Manuals/Guidelines for this like:


1) Seismic Evaluation and Strengthening of Existing

Buildings.

by
Dr. Durgesh C. Rai
Department of Civil Engineering
Indian Institute of Technology Kanpur Kanpur

In USA we use the following documents for Strength Evaluation of Existing Structures:
I have used these two documents in USA for Existing Buildings projects.

2)
ASCE 31-03: Seismic Evaluation of Existing Buildings.
SEI/ASCE 41-06 Seismic Rehabilitation Of Existing Buildings.

Since people live in these old Existing Buildings , this becomes a big issue of PUBLIC SAFETY. We all know and also AMC (Ahmadabad) and GSDMA knows that this need to be done as soon as possible. People lives are involved and to say that we are helpless because IS 1893 does cover Existing Buildings is not right in my opinion. We need to use above listed manuals/publications or other similar documents and protect people in an Seismic Event. Ahmadabad in Zone III and
suffered major damages in terms of public lives and building damages during Bhuj Earthquake of 2001.

Regards.

Vasudeo Pandya P.E. ; S.E.
Structural Engineer.






Subject: [SEFI] Seminars on Construction Contracts – International and Indian Experiences
From: forum@sefindia.org
Date: Tue, 7 May 2013 10:25:26 +0530
To: general@sefindia.org

           This is sponsored event announcement. Interested persons should get directly in touch with undersigned contacts in this email.



Dear Sir/Madam,

Consulting Engineers Association of India are organizing Seminars on Construction Contracts – International and Indian Experiences at India Habitat Centre, Delhi and IIT Madras-Chennai. The Seminars will be very useful to your organization to provide a platform to interact with highly experienced faculty members from UK, Dubai, Romania and India, who have vast experience in dealing with contracts across many countries. The programme including profiles of speakers and the registration form are attached for your use (download from link at bottom of this mail).


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i. Mr. Mark Tiggeman : Partner of Kennedys, an English International Law Firm, U.K.
ii. Mr. Giovanni Di Folco : President and Senior Partner of Techno Engineering & Associates Ltd, Romania
iii. Mr. Nick Carnell : Partner of Kennedys, an English International Law Firm, Dubai


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i. Mr. Rajat Taimni : Partner with Tuli & Co. an Insurance driven dispute resolution law firm with offices in Delhi and Mumbai

ii. Dr. P. V. Amarnadha Prasad : Chairman of Technical Arbitrators, Andhra Pradesh State Centre, Andhra Pradesh.

iii. Dr. K. N. Satyanarayana : Professor in the Building Technology & Construction Management Division of the Department of Civil Engineering, at IIT-Madras

iv. Mr. Uttam Sengupta : GM – Risk Management, International Operation Business Group, Voltas Ltd., Mumbai.


The Registration From is provided on the download link at bottom of this email. Please mention where you prefer to attend the Seminar (New Delhi or Chennai).


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For Chennai : Mr. Jeffrey Nambiar, Regional Secretary cum Treasurer, CEAI-Western Region Centre
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Download Attachments:
Construction_Contracts_2013_-_Brochure_updated.pdf

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Last edited by VPandya on Mon Feb 06, 2023 9:43 pm; edited 3 times in total
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prof.arc
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PostPosted: Wed May 15, 2013 12:42 am    Post subject: Seminars on Construction Contracts – International and India Reply with quote

Dear Mr. Pandya,
I was never against any individual / organization deciding to carry
out strengthening
of their existing structures
They could follow any procedure that is deemed fit by them.
However, there is a catch here - what level of earthquake hazard has
to be decided
At present BIS is the official agency and they would not specify
earthquake proof specification but only earthquake resistant design
(with some undefined degree of damage)

You would probably agree that Delhi is more (if not atleast equally)
hazardous as compared to Ahmedabad, It is the seat of politically and
financially powerful persons and they must be equally worried like
you. For example, the offices and residences of seats of power may
demand so.

Who would bell the cat to specify nearly earthquake proof structures -
even where such decisions are made by some experts in case of NPP's /
Dams to name a few, there will be a lot critics who would cry (shout)
that it is insufficient and say it should not be built.
Some such examples of dispute are Tehri Dam / Kundankulam NPP

I feel it is necessary to read the story of Koyna Dam to understand
the real side of the problem. I will post my version of that story
very shortly

Private individuals who want to spend money to live in a fortress are
always free to do so
However, I am against spending public money in regions other than
North East India
to start this strengthening activity

sincerely
ARC

On 5/14/13, VPandya <forum@sefindia.org> wrote:
Quote:
Dear Prof. Arc. and Prof. Vaisakhg,

Since IS 1893 is silent on Seismic Evaluation and Seismic Retrofitting of
Existing Buildings , can we use some other Industry Respected
Manuals/Guidelines for this like:


Regards.

Vasudeo Pandya P.E. ; S.E.
Structural Engineer


Posted via Email
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VPandya
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PostPosted: Thu May 23, 2013 2:43 pm    Post subject: On preparedness of Indian Cities for Earthquakes like Bhuj Reply with quote

Dear  Prof. Arc,
Thanks for post dated 15th May 2013. I was away from town so could not reply earlier. I agree with you that Indian Cities in North East region need immediate attention as far as Seismic Strengthening  of Existing Buildings ( Not  designed or poorly design  for IS 1893) is concerned.

I want to make a point that  people live in buildings which are not safe for a Earthquake of the magnitude of Bhuj earthquake of 2001. There may be thousand of such Structures in
many cities of say Gujarat. These cities are in Zone III  not in Zone IV and Zone V like cities in North  East India.  We have Govt. institutions  like  NDMA and GSDMA. Why not these agencies issue guidelines/manuals and require the owners of these UNSAFE  BUILDINGS to strengthen them for Earthquake. We all know that if a similar earthquake event like BHUJ 2001 hits again, many people even in Zone III will die.  Many  buildings will collapse. Point is  "On preparedness of  Indian Cities for Earthquakes like Bhuj" .
Most of this strengthening will be done by PRIVATE MONEY . All Govt. has to do is to make sure that  seismic strengthening is done for all Unsafe Buildings.

Regards.

Vasudeo Pandya  P.E. ; S.E.
Structural Engineer
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B.V.Harsoda
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PostPosted: Fri May 24, 2013 2:34 am    Post subject: Reply with quote

HANDBOOK ON SEISMIC RETROFIT OF BUILDINGS:-
By

Central Public Works Department
&
Indian Building Congress

In association with I.I.T. MADRAS


DOWNLOAD LINK:-


http://cpwd.gov.in/Units/FinalDraftHandbook_Apr2007.pdf
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PostPosted: Fri Nov 01, 2013 4:50 am    Post subject: ACI 562-13. Evaluation , Repair, Rehab. of Concrete Bldgs. Reply with quote

Dear   Sefian's,  

Need for Evaluation, Repair and Rehabilitation of  Concrete Building in India can not be overstated. Relatively new buildings not designed per code or Existing old Buildings, both need to be looked at. On this subject here is the latest ACI 562-13 from ACI. Just recently
MUMBAI MUNICIPAL CORP./Maharastra Govt.  has required existing old structures be audited and have Structural Stability  Certificate issued for each one of them.  Big job considering the size of Mumbai City.

See  also SEFI posts on  Maharastra Govt. requirements on "Structural auditors to be held accountable if building collapses ".

I think  guidelines of ACI 562-13 will be very useful to Structural Engineers working on these projects.

  
From ACI:  

CODE REQUIREMENTS FOR EVALUATION, REPAIR, AND REHABILITATION OF CONCRETE BUILDINGS (aci 562-13) AND COMMENTARY<o></o>

Thenew ACI 562 code provides standard requirements for evaluating existing concrete buildings and then the subsequent structural repair, rehabilitation,and strengthening of those buildings. This code provides rules for a preliminary evaluation that determines the “design basis code”—that is, if the building can be repaired based on the ACI 318 version used in the original design, or if the repair needs to comply with the current ACI 318. The code provides rules for determining strength of in-place material, performing structural analysis, designing repairs for strength and durability,requirements for stability and shoring of construction, and inspection and testing of repairs. Commentary provides application guidance as well as references for additional information.


Web-Link:

http://www.concrete.org/bookstorenet/ProductDetail.aspx?ItemID=56213



Regards.

Vasudeo Pandya  P.E. ; S.E.
Structural Engineer



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PostPosted: Sun Jun 22, 2014 4:55 pm    Post subject: Christchurch Post-Quake Rebuild Picks Up Steam. Reply with quote

Dear  Ers. at  Sefi,
See the commitment of a city  (Christ Church, New Zealand) for Public-Safety. See the amount of money this city is spending  so people can live in this city (  a High Seismic Zone City) with less fear to die in case of a similar Seismic Event of  Feb. 2011. Any  Indian agency like  Ahmedabad Municipal Corp, (AMC), NDMA, GSDMA think that PUBLIC-SAFETY in an Earthquake comes cheap, they should think again after reading this article. If we  are not going to do what  Christchurch city is doing, we are telling people in Delhi, Ahmedabad and other Indian cities, WE ARE NOT SURE IF  YOU PEOPLE will survive if another Seismic Event like 2001 Bhuj happens. We do not have money for Seismic Retrofit of  Unsafe Buildings.   Or we are telling people , ALL EXISTING BUILDINGS IN DELHI, AHMEDABAD AND OTHER CITIES DO NOT NEED ANY SEISMIC RETOFIT. YOU ARE LIVING IN SEISMIC SAFE BUILDINGS. DO NOT WORRY?  CITY  OF  CHRISTCHURCH IS WASTING THEIR MONEY .

Read this:  From latest "ENGINEERING  NEWS RECORD (ENR) ".  An USA Construction Magazine. :

Christchurch Post-QuakeRebuild Picks Up Steam:  06/23/2014

Economists predict it will take some$35 billion and 50 to 100 years for New Zealand to recover from the February2011 Canterbury earthquake, which killed 185 people and devastatedChristchurch, the nation's second-largest city. To date, the New Zealand government has committed more than $13 billion to rebuilding the greaterChristchurch area. Many projects—both public and private—are under development,including a convention center, a  $45.9-million Bus Interchange, there development of Christchurch Hospital, the new Awly Building and many new schools.


Web-Link  for Full Story:


http://enr.construction.com/buildings/building_types/2014/0623-christchurch-rebuild-after-devastating-2011-quake-picks-up-steam.asp


Regards.

Vasudeo Pandya  P.E. ; S.E.
Structural Engineer



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PostPosted: Wed Jul 16, 2014 10:53 am    Post subject: Just published standards ASCE/SEI 30-14 and ASCE/SEI 41-13 Reply with quote

Dear  SEFI  Enrs ,

ASCE'S  just published two updated/revised important  publications.     

Guideline for Condition Assessment of the Building Envelope
Standards ASCE/SEI 30-14

ThisStandard updates and replaces the previous Standard ASCE/SEI 30-00. Revised and reorganized, Standard ASCE/SEI 30-14 includes a new section on fabric structures and updates to figures and referenced standards.
Read more.

2014 | 46. pp | List $80 / ASCE Member $60


Seismic Evaluation and Retrofit of Existing Buildings
Standards ASCE/SEI 41-13

This next-generation standard describes deficiency-based and systematic procedures that use performance-based principles to evaluate and retrofit existing buildings to withstand the effects of earthquakes. Read more.


2014 | List $220 / ASCE Member $165

Regards.

Vasudeo Pandya P.E. ; S.E.
Structural Engineer





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PostPosted: Wed Jul 16, 2014 4:21 pm    Post subject: Re: Just published standards ASCE/SEI 30-14 and ASCE/SEI 41 Reply with quote

Dear  Er.  Pandya Sir,

BIS has also published below Standard:-


IS 15988:2013 Seismic Evaluation and Strengthening of Existing Reinforced Concrete Buildings - Guidelines



Regards,
Er. B. V. Harsoda




VPandya wrote:
Dear  SEFI  Enrs ,

ASCE'S  just published two updated/revised important  publications.     

Guideline for Condition Assessment of the Building Envelope
Standards ASCE/SEI 30-14

ThisStandard updates and replaces the previous Standard ASCE/SEI 30-00. Revised and reorganized, Standard ASCE/SEI 30-14 includes a new section on fabric structures and updates to figures and referenced standards.
Read more.

2014 | 46. pp | List $80 / ASCE Member $60


Seismic Evaluation and Retrofit of Existing Buildings
Standards ASCE/SEI 41-13

This next-generation standard describes deficiency-based and systematic procedures that use performance-based principles to evaluate and retrofit existing buildings to withstand the effects of earthquakes. Read more.


2014 | List $220 / ASCE Member $165

Regards.

Vasudeo Pandya P.E. ; S.E.
Structural Engineer





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PostPosted: Wed Apr 25, 2018 3:32 pm    Post subject: This is 25th April 2018 and San Francisco , CA , USA is still not doing it. Reply with quote

Dear Sefi , Engrs.,

This is 25th April 2018 and San Francisco , CA , USA is still not doing retrofit of old concrete building ( Seismic Retrofit ) . San Francisco is in the Highest Seismic Zone in USA .

Bay Area falling behind on quake safety despite booming tech economy :
Despite soaring property values in California's Bay Area, the region has done little to retrofit the 2,000 to 3,000 "brittle" concrete buildings in San Francisco or the potentially 2,000 wood-frame apartments in Oakland against earthquakes. The region has become "rather complacent about how we stand as far as the risk," according to a policy advisor for the Association of Bay Area Governments.
Web-Link :
Los Angeles Times (tiered subscription model) (4/22)

See latest ASCE  Smart Brief .

Regards .

Vasudeo Pandya P.E.
Structural Engineer
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PostPosted: Sat Sep 05, 2020 3:11 am    Post subject: ACI New Code/Revised on Repair of existing concrete Structures. ACI 562-19 Reply with quote

Sefi Engrs.,

The American Concrete Institute (ACI) has released ACI 562-19 Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures and Commentary.

Concrete repair code requirements released
American Concrete Institute offers guidance on assessment, repair, rehab of existing concrete structures.

The American Concrete Institute (ACI) has released ACI 562-19 Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures and Commentary.

The code was written to be integrated into building codes for increased confidence that repairs are performed in a manner that provides an acceptable level of protection for the public, according to an ACI new release.

The code was developed to integrate with the International Code Council’s International Existing Building Code or to be adopted as a stand-alone code.

“ACI 562-19 provides owners confidence that their repair projects will be designed to a common standard, engineers a uniform set of requirements specific to existing concrete structures, building officials a basis upon which to evaluate design and construction, and contractors clarification of responsibilities,” says Michael L. Tholen, ACI managing director, engineering and professional development.

Key changes to the 2019 version of the code include:
· Improved integration with ACI 318 Building Code Requirements for Structural Concrete
· Improved integration with the ICC International Existing Building Code
· More context provided regarding durability
· Improved text and commentary related to load combinations during fire events
· Improved text and commentary related to applicability of ACI 562
· Simplified requirements for the basis of design report
· Clarification of requirements related to detailing of existing reinforcing steel.


A much needed ACI document to do it thoroughly and right .

Regards .

Vasudeo Pandya P.E.
Structural Engineer
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