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clause 6.2.2.4_damping ratio
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zafarmujawar
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PostPosted: Wed Mar 14, 2018 7:08 am    Post subject: clause 6.2.2.4_damping ratio Reply with quote

On what basis the factor sqrt(10/7) has arrived.

On Wed, 14 Mar 2018 at 10:48 AM, indrajit-chowdhury <forum@sefindia.org (forum@sefindia.org)> wrote:

[quote]            I would multiply the response spectrum value Sa/g furnished in code by a factor sqrt ( 10/7) to arrive at value for 2 % damping.

On 14 Mar 2018 10:14 am, "hemalmistry" forum@sefindia.org (forum@sefindia.org))> wrote:       --auto removed--

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Debdip Roy
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PostPosted: Wed Mar 14, 2018 7:08 am    Post subject: clause 6.2.2.4_damping ratio Reply with quote

No need the clarification email 

On Wed, 14 Mar 2018 at 10:02 AM, imteyaz_ahmad <forum@sefindia.org (forum@sefindia.org)> wrote:

[quote]            Clause 7.3.11 is in contradiction with Table 1 in Section 5, which prohibits use of flat slab in Zone IV & V. But 7.3.11 says to ignore ignore stiffness of flat slab. Code should be consistent with its provisions, one can be confused to use whether use flat slab system or not in those zones.


On 14 March 2018 at 00:12, hemalmistry forum@sefindia.org (forum@sefindia.org))> wrote:
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yadavenkatesh
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PostPosted: Wed Mar 14, 2018 8:32 pm    Post subject: clause 6.2.2.4_damping ratio Reply with quote

Use 2 percentage for wind load analysis and 5 percent for seismic load analysis






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-- Original message --
From: hemalmistry <forum@sefindia.org>
Date: 13/03/2018 22:42 (GMT+04:00)
To: econf@sefindia.org
Subject: [E-CONF] clause 6.2.2.4_damping ratio



     Clause 6.2.2.4 requires damping ratio of 2% for concrete. Design acceleration spectrum as per IS 1893-1_2016 is for 5% damping. Which spectrum shall be used for 2% damping as per IS 16700?

IS 1893-1_2002 was having multiplying factor for dampling other than 5%.


Regards
Hemal mistry
Surat

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