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Is Your Home Earthquake Resistant?

By
Technical paper Presented by:
Mr.Jismon Issac B.E (Mech) A.I.E, MBA

Over the past few years, India has seen a spurt in the vertical growth of buildings. They range from individual houses to very tall skyscrapers. Whenever news on earthquake is reported, we have only one question in our mind – Is our home safe during an earthquake?

Engineers always tell us that earthquake don’t kill, but that will be done by poorly built constructions. Earthquake resistant buildings can be made, only by constructing our homes with ductile character. For a better understanding in earthquake resistant buildings, we must acquire knowledge about earthquakes and its occurrence. The points are given as below;

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Seismic Vulnerability Assessment of School Buildings

SEISMIC VULNERABILITY ASSESSMENT of SCHOOL BUILDINGS: GAZA STRIP SCHOOLS as a CASE STUDY
BY
S. M. Shehada 1, S. Q. Shurrab 2
1,2 Department of Civil Engineering, Islamic University of Gaza, Gaza Strip, Palestine

Abstract
This study introduces a new approach for seismic assessment of existing school buildings. The proposed approach requires minimum human effort as it can be implemented by a small team of technical construction background. The approach is based on EMS-98 scale in addition to rapid survey of architectural and structural elements of existing school buildings. The study uses 64 selected public school buildings sampled from a total of 364 schools in Gaza Strip. The results showed that 50% of the surveyed schools are classified as Vulnerability class B, while 20 % are classified as Vulnerability Class A. The results were verified using the ‘probability matrix damage’ approach and showed good satisfying convergence. The results of the study are beneficial for the responsible parties who are expected to take appropriate actions related to enhancing seismic performance of Gaza Strip schools against seismic activities, due to the fact that these school buildings not only host about 450,000 students and teachers, but also serve as emergency shelters for those who lose their homes as a result of political instabilities in the region.

Keywords: Damage, Vulnerability, EMS-98, Seismic risk, structural type.

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Design of RCC Flat Slab Structure Under Earthquake Loading Using Etabs

By
M.RAJAGOPAL REDDY 1, P.RAJESH 2
1- Post Graduate student, Department of civil Engineering,VFSTR university , Vadlamudi.
2-Assistant Professor, Department of civil Engineering, VFSTR university, Vadlamudi.

ABSTRACT
The FLAT SLAB SYSTEM being used in majority of the constructions. It elevates more clear space in architecting the construction design in easy manner and duration of construction would be short due to the flat slabs size. Compare to the traditional concrete construction slab system is more viable due to the fact that it avoids the heavy beams, which are the big vulnerability in case of earthquakes. Objective of this paper is to investigate the behavior of flat slab system in few different use cases.

1. Flat slab structure without drop.
2. Flat slab structure with column drop.
3. Flat slab structure with shear wall.
4. Flat slab structure with column drop and shear wall together through response spectrum method by using ETABS software.

The behavior of flat slab is investigated in terms of the following factors:
1. Frequency
2. Base Shear
3. Storey level accelerations

Also most severe problem in flat slabs as follows:
1. Failure punching shears
2. Shear stresses during ground unbalance
3. Slab column connections to brittle punching shear stresses during earthquakes.

Also this paper investigates about the combinations that can produce less punching shear at slab column joint.

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Super Ductile Rebars for Earthquake Prone Buildings

By
Priyanka Gupta

1.0 Introduction
In April 2016, 81 new towns and cities were added to a list of areas prone to earthquakes, bringing the total to 107. In 2012, BIS has introduced special earthquake resistant steel in India standard 1786 for HYSD bars. But this still needs a mention in design code of IS 456 for design help. There are few manufacturers in India which make earthquake resistant steel with grade name as Fe 500 SD which can be used in seismic resistant designed buildings.

Zone Intensity
II Less than equal to 4
III 7
IV 8
V More than or equal to 10
Note:Intensity measured in ‘Modified Mercalli Scale’

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Safety / Stability of RCC structure during earthquake – A challenge to overcome

India has been plagued by some catastrophic earthquake tremors in past that have caused loss of property and human beings:

Date Location Effect Magnitude
January 3, 2016 North East India 11 dead, 200 injured 6.7
May 12, 2015 Northern India, North East India, Bihar West Bengal (Epicenter at Nepal) 218 (44 killed in India) 7.3
April 25, 2015 Northern India, North East India, Gujarat (Epicenter at Nepal) 8,900+ 7.8
September 18, 2011 North East India, Gangtok, tremors felt in Delhi, Kolkata, Lucknow and Jaipur 118 6.9
October 8, 2005 Kashmir 1,30,000 7.6
December 26, 2004 Third deadliest earthquake in the history of the world, the tsunami generated off west coast northern Sumatra, India, Sri Lanka, Maldives 283106 (15000 killed in India) 9.1
January 26, 2001 Gujarat 20,000 7.6/7.7

However, during the earthquake in New Zealand on 3rd September 2010 (magnitude on Richter’s scale: 7.0), only 2 people were injuredwhich was caused by falling masonry and glass. Interestingly, the said earthquake had struck when most people were asleep. Therefore it is clear that “EARTHQUAKES DON’T KILL PEOPLE, BUILDINGS DO!
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