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Natural Floor frequency for comfort Design

 
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B.V.Harsoda
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PostPosted: Sun Nov 25, 2012 2:49 pm    Post subject: Natural Floor frequency for comfort Design Reply with quote

Natural Floor frequency for Comfort Design of Tall Buildings:-

Natural floor frequency consideration in Tall Building Beams & Slabs design is very important for comfort of users.

Er. T. RangaRajan Sir has also posted very good articles previously at below Links:-
http://www.sefindia.org/rangarajan/15557850-Guide-to-LongSpan-Concrete-Floors.pdf

http://www.sefindia.org/rangarajan/FLOOR_VIBRATION/Tips_for_Designers.pdf




Below are my previous Posts regarding Natural Floor Frequency Design:-

http://www.sefindia.org/forum/viewtopic.php?t=11555

http://www.sefindia.org/forum/viewtopic.php?p=44235


More Discussion In This Subject Requested Please.


Regards,
Er. B. V. Harsoda
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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 Nov 26, 2012 10:27 pm    Post subject: Reply with quote

Paper to Control Vibration of Tall Building link:-

STOCHASTIC VIBRATION CONTROL OF TALL BUILDING

http://www.iitk.ac.in/nicee/wcee/article/9_vol5_853.pdf


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Er. B. V. Harsoda
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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 Nov 26, 2012 11:21 pm    Post subject: Reply with quote

The 14th World Conference on Earthquake Engineering
October 12­17, 2008, Beijing, China
AMBIENT VIBRATION MEASUREMENT AND EARTHQUAKE
RESISTANT BEHAVIOR ANALYSIS ON A TWO­TOWER TALL
BUILDING WITH ENLARGED BASE
Y. Zhou
1
and W.J. Yi
2
1
PhD student, College of Civil Engineering ,Hunan University, Changsha, P.R.China
2
Professor, College of Civil Engineering, Hunan University, Changsha, P.R.China
Email: zhouyun05@gmail.com, hunuyi2006@gmail.com
ABSTRACT :
The two­tower building with enlarged base is a high­rise building form favored by the architect. In this paper the ambient vibration measurement was conducted on a 86­meters­high frame­wall tall building. This building consists of two towers connected by air corridors and an enlarged base. Translational and torsional modes are measured. SATWE  module  in PKPM software is  used to model the structure and the analytical modes  are calculated. It  is found that  due to the  eccentricity of the air corridors, each mode shape in the structure has component  of torsional  vibration, and the higher modes  are all torsional modes. In comparison with the experiential formulas used in calculating fundamental period of tall building in different country, it is found that the measured fundamental period of the structure is  higher than the results by calculation. It shows  that  the measured stiffness  of the structure is  higher than that  of the analytical model. At  last the designed ground motions  are used in the elastic dynamic  time history  analysis  by using Newmark­b method, and the results show that the response forces  concentrate on the transfer story and the highest air corridor on the top of the
tower, and the shear forces  have greatly changed. Due to the  connection of the air corridor, the bending moments and lateral displacements are approximately equal to each other in X and Y direction.

Source Link:-
http://www.iitk.ac.in/nicee/wcee/article/14_12-01-0075.PDF

Regards,
Er. B. V. Harsoda
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