Seismic load application as per IS 1893 - 2016

access_time 2019-01-31T13:17:39.556Z face NIRAV PATEL

Seismic load is define as Horizontal/Vertical load due to ground motion cause of Earthquake. Load act at base/foundation of the structure called as base shear.

Seismic load depends on following:

  • Weight of structure (W)
  • Height and width of structure (H, D)
  • Soil conditions (sa/g)
  • Geographical area (Zone factor, Z)

To make earthquake resistant of structure we considered following,

  • Importance of building (I)
  • Response reduction factor (R)

By considering above factor, Indian code recommended formula to calculate horizontal seismic coefficient, Ah (cl: 6.4.2 IS 1893(Part 1): 2016)

 

Z is Seismic zone factor, which is depend on Territory of location. Indian Territory divided in four Seismic Zone and Zone factor as per Territory.  

Seismic Zone factor, Z as per IS 1893 (Part 1) - 2016

Seismic Zone

II

III

IV

V

Z

0.1

0.16

0.24

0.36

 

Seismic zone decide as per Earthquake prone area. Zone V means highest level of possibility of Seismicity whereas zone II associated with the lowest level of possibility of Seismicity.

Here are the zone factor for some of the well-known place in India.

City

State

Zone

Value of Z

Agra

Delhi

III

0.16

Ahmedabad 

Gujarat

III

0.16

Ajmer

Rajasthan

II

0.10

Allahabad

Uttar Pradesh

II

0.10

Almora

Uttarakhand

IV

0.24

Ambala

Haryana

IV

0.24

Amritsar

Punjab

IV

0.24

Asansol

West Bengal

III

0.16

Aurangabad

Maharashtra

II

0.10

Bahraich

Uttar Pradesh

IV

0.24

Bangaluru

Bangaluru

II

0.10

Barauni

Bihar

IV

0.24

Bareilly

Uttar Pradesh

III

0.16

Belgaum

Karnataka

III

0.16

Bhatinda

Punjab

III

0.16

Bhilai

Chhattisgarh

II

0.10

Bhopal

Madhya Pradesh

II

0.10

Bhubaneshwar

Odisha

III

0.16

Bhuj

Gujarat

V

0.36

Bijapur

Karnataka

III

0.16

Bikaner

Rajasthan

III

0.16

Bokaro

Jharkhand

III

0.16

Bulandshahr

Uttar Pradesh

IV

0.24

Burdwan

West Bengal

III

0.16

Calicut( Kozhikode)

Kerala

III

0.16

Chandigarh

Punjab

IV

0.24

Chennai

Chennai

III

0.16

Chitradurga

Karnataka

II

0.10

Coimbatore

Tamil Nadu

III

0.16

Cuddalore

Tamil Nadu

III

0.16

Cuattack

Odisha

III

0.16

Darbhanga

Bihar

V

0.36

Darjeeling

West Bengal

IV

0.24

Dharwad

Karnataka

III

0.16

Dehra dun

Uttarakhand

IV

0.24

Dharmpuri

Tamil Nadu

III

0.16

Delhi

Delhi

IV

0.24

Durgapur

West Bengal

III

0.16

Gangtok

Sikkim

IV

0.24

Guwahati

Assam

V

0.36

Gulbarga

Karnataka

II

0.10

Gaya

Bihar

III

0.16

Gorakhpur

Uttar Pradesh

IV

0.24

Hyderabad

Andhra Pradesh

II

0.10

Imphal

Manipur

V

0.36

Jabalpur

Madhya Pradesh

III

0.16

Jaipur

Rajasthan

II

0.10

Jamshedpur

West Bengal

II

0.10

Jhansi

Uttar Pradesh

II

0.10

Jodhpur

Rajasthan

II

0.10

Kakrapara

Gujarat

III

0.16

Kalpakkam

Tamil Nadu

III

0.16

Kanchipuram

Tamil Nadu

III

0.16

Kanpur

Uttar Pradesh

III

0.16

Karwar

Uttara kannada

III

0.16

Kochi

Kerala

III

0.16

Kohima

Nagaland

V

0.36

Kolkata

West Bengal

III

0.16

Kota

Rajasthan

II

0.10

Kurnool

Andhra Pradesh

II

0.10

Lucknow

Uttar Pradesh

III

0.16

Ludhiana

Delhi

IV

0.24

Madhurai

Tamil Nadu

II

0.10

Mandi

Himachal Pradesh

V

0.36

Mangaluru

Karnataka

III

0.16

Mungher

Bihar

IV

0.24

Moradabad

Uttar Pradesh

IV

0.24

Mumbai

Maharashtra

III

0.16

Mysuru

Karnataka

II

0.10

Nagpur

Maharashtra

II

0.10

Nagarjunasagar

Telangana 

II

0.10

Nainital

Uttarakhand

IV

0.24

Nashik

Maharashtra

III

0.16

Nellore

Andhra Pradesh

III

0.16

Osmanabad

Maharashtra

III

0.16

Panjim

Goa

III

0.16

Patiala

Punjab

III

0.16

Patna

Bihar

IV

0.24

Pilibhit

Uttar Pradesh

IV

0.24

Pondicherry

Tamil Nadu

II

0.10

Pune

Maharashtra

III

0.16

Raipur

Chhattisgarh

II

0.10

Rajkot

Gujarat

III

0.16

Ranchi

Jharkhand

II

0.10

Roorkee

Haridwar

IV

0.24

Rourkela

Odisha

II

0.10

Sadiya

Assam

V

0.36

Salem

Tamil Nadu

III

0.16

shillong

Meghalaya

V

0.36

Shimla

Himachal Pradesh

IV

0.24

Sironj

Madhya Pradesh

II

0.10

Solapur

Maharashtra

III

0.16

Srinagar

Jammu and Kashmir

V

0.36

Surat

Gujarat

III

0.16

Tarapur

Maharashtra

III

0.16

Tezpur

Assam

V

0.36

Thane

Maharashtra

III

0.16

Thanjavur

Tamil Nadu

II

0.10

Thiruvananthapuram

Kerala

III

0.16

Tiruchirapalli

Tamil Nadu

II

0.10

TiruVannamalai

Tamil Nadu

III

0.16

Udaipur

Rajasthan

II

0.10

Vadodara

Gujarat

III

0.16

Varanasi

Uttar Pradesh

III

0.16

Vellore

Tamil Nadu

III

0.16

Vijayawda

Andhra Pradesh

III

0.16

Visakhapatnam

Andhra Pradesh

II

0.10

 

Map of Seismic zone of INDIA:

 

I stand for importance factor, which is depends on type of building. 1.5 for highly important structure like school, hospitals and ancient building, 1.2 for business continuity structures and 1.0  for rest of structure. However structural engineer may choose higher.

R is response reduction factor. This value depend on type of structure given in IS 1893 (Part 1 to 5)

 

Sa/g is average response acceleration coefficient which is depends on time period of structure and on type of soil. This is given in cl 6.4.2, IS 1893 – 2016.

 

 

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