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Seismic Design
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B.V.Harsoda
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PostPosted: Tue Dec 01, 2015 1:55 pm    Post subject: Reply with quote

The Earthquake Tips 25 and 26 authored by Prof. CVR Murty have been uploaded at
http://www.nicee.org/EQTips.php.
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B.V.Harsoda
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PostPosted: Tue Dec 01, 2015 3:24 pm    Post subject: Reply with quote

New Zealand
Society for Earthquake
Engineering Inc.
Advancing the science and practice of
earthquake engineering


Link:-
http://www.nzsee.org.nz/
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B.V.Harsoda
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PostPosted: Fri Feb 05, 2016 3:32 pm    Post subject: Reply with quote

Draft for comment:-
Indian Standard Guidelines for Criteria For Earthquake Resistant Design Of
Structures: Part 1 General Provisions For All Structures And Specific Provisions
For Buildings [Sixth Revision of IS 1893 (Part 1)]

In this current (Sixth) revision, in addition to others, the following significant changes have been included:
1) Additional clarity on how to handle different types of irregularity of structural system;
2) Explicitly including effect of masonry infill walls on design of frame buildings;
3) Simplifying torsional provisions; and
4) Including simplified method for liquefaction potential analysis.

Link:-
http://www.bis.org.in/sf/ced/CED39(7975)_04022016.pdf
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Dr. N. Subramanian
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PostPosted: Fri Feb 05, 2016 8:37 pm    Post subject: Reply with quote

Dear Er Harsoda,

Thank you very much for giving the link for the Draft IS 1893 (Part 1). Prof. ARC may be happy to see this.


Prof. R.N. Iyengar may be happy to see the following note found in the draft:
The Sectional Committee is currently deliberating on the following subjects for possible standardization:
1. Probabilistic seismic hazard map (PSHM) of India
2.  Provisions on flat slabs
3. Performance Based Design (including retrofitting)
4.  Response spectra (for 6 seconds and more) & Soil classification
5. Guidelines on Seismic Microzonation
6. Seismic Base Isolation & Energy Absorption Devices
7.  Liquefaction potential of soils during earthquakes (Including mitigation measures;


Annex F of the draft gives SIMPLIFIED PROCEDURE FOR EVALUATION OF LIQUEFACTION POTENTIAL
Annex G gives PERFORMANCE-BASED DESIGN
and Annex H DESIGN OF SLAB-COLUMN SYSTEMS

Many changes are there in the draft code. I will try to post a note on that later.

Warm regards,
Subramanian
B.V.Harsoda wrote:
Draft for comment:-
Indian Standard Guidelines for Criteria For Earthquake Resistant Design Of
Structures: Part 1 General Provisions For All Structures And Specific Provisions
For Buildings [Sixth Revision of IS 1893 (Part 1)]

In this current (Sixth) revision, in addition to others, the following significant changes have been included:
1) Additional clarity on how to handle different types of irregularity of structural system;
2) Explicitly including effect of masonry infill walls on design of frame buildings;
3) Simplifying torsional provisions; and
4) Including simplified method for liquefaction potential analysis.

Link:-
http://www.bis.org.in/sf/ced/CED39(7975)_04022016.pdf
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B.V.Harsoda
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Joined: 19 Jan 2009
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Location: RAJKOT,GUJARAT, INDIA

PostPosted: Mon Feb 29, 2016 10:32 pm    Post subject: Reply with quote

The Earthquake Tips 27,28,29,30,31 and 32 authored by Prof. CVR Murty have been uploaded at

http://www.nicee.org/EQTips.php.


As below:-
Eq Tip 27 How can Non-structural Elements be protected against Earthquakes?

Eq Tip 28 What is a Confined Masonry Construction?

Eq Tip 29 What are the Essential Features of Confined Masonry Houses?

Eq Tip 30 What is Important in Foundations of Earthquake-Resistant Buildings?

Eq Tip 31 Why do Buildings Sink into the Ground during Earthquakes?

Eq Tip 32 Why is Quality critical in Earthquake-Resistant Buildings?
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B.V.Harsoda
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Joined: 19 Jan 2009
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Location: RAJKOT,GUJARAT, INDIA

PostPosted: Tue Apr 26, 2016 2:05 am    Post subject: Reply with quote

16th World Conference on Earthquake Engineering, January 09-13, 2017, Santiago, Chile
  
16th World Conference on Earthquake Engineering is scheduled to be held during January 09-13, 2017 at Santiago, Chile. The last date for abstract submission is October 15, 2015. For further details please visit

http://16wcee.com/index.php
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stharish
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PostPosted: Mon May 09, 2016 6:51 am    Post subject: Question on shear wall design example Reply with quote

Dear Sefians,

Attached is a pdf of IIT Kanpur short course on Ductile detailing of RC structures. I have 2 questions on the worked out shear wall design example. I request our members to clarify my questions below.

1)  On pg-105,
The factored axial load = 1845 KN, then
Assuming the axial load uniformly distributed on the web = 0.574 * 1845 = 1059 KN

Please explain the above assumption?

2) On pg-109,

Maximum factored compression on the boundary element
[849 + 0.213   1.2   (1922.9 + 255.7)] =  1406 kN
Factored tension on the boundary element,
[0.213   (0.8   1922.9 - 1.2   255.7) -849] =  -587 kN

Why is the factor 0.213 used in the above equations?

Thanks in advance for your time and help.

Best,
Harish



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ShearWall-IITKanpur-IS13920_1993-DCR.pdf
 Description:
IIT Kanpur short course on Ductile detailing of RC structures

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s.bhushanraj
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PostPosted: Tue May 10, 2016 11:45 am    Post subject: Reply with quote

Dear Harish,

There is a mistake in the geometry drawing. The width of boundary elements is actually 760 instead of 76. The same mistake is also in the IITK-GSDMA - Explanatory Examples for Ductile Detailing of RC Buildings.

In the commentary provided in, Proposed Draft Provisions and Commentary on Ductile Detailing of RC Structures Subjected to Seismic Forces, the reference for the detailed calculations is given as Medhekar, M.S., and Jain, S.K., "Seismic Behaviour, Design, and Detailing of RC Shear Walls, Part I: Behaviour and Strength," The Indian Concrete Journal, Vol. 67, No. 7, July 1993, 311-318.  

The example is given in the appendix of second part of the paper, Seismic behavior, design and detailing of RC shear walls, Part 2 - Design and Detailing by Madhekar and Jain. The boundary element has size of 380 x 760, thus the ratio of web area to the total area is (3380*230)/(3380*230+2*380*760) = 0.574 and the ratio of boundary element area to the total area is (380*760)/(3380*230+2*380*760) = 0.213.

The link to the paper is attached below for your reference.
http://www.iitk.ac.in/nicee/skj/Research_Papers/SeismicBehaviour_Design%26DetailingofShearWalls-II.pdf

Regards,

Bhushan Raj
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stharish
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PostPosted: Wed May 11, 2016 12:06 pm    Post subject: Reply with quote

Mr. Bhushan Raj,

Thanks for the explanation and journal link.

Harish
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ajaymistry
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Posts: 23

PostPosted: Sun May 15, 2016 3:04 pm    Post subject: Dynamic Analysis as per ASCE-7 in STAADPRO Reply with quote

Dear All,
As per Clause 12.9 of ASCE-7 (Modal Response Spectrum Analysis) , does STAADPRO include Accidental torsion while performing Dynamic Analysis.
I would request sefians to kindly enlighten on this.
If STAADPRO uses Accidental torsion as per Clause 12.9.5 of ASCE-7 , then where does it reveal ?

Regards,
Ajay V Mistry
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