IS 1893:2016 Part 1 : General Provisions and Buildings.

IS 1893:2016
Part 1 : General Provisions and Buildings.

1. IS 1893:2016 Part 1 : General Provisions and Buildings

2. 1. Introduction IS 1893 2016 is an Indian Standard that provides the criteria for earthquake resistant design of structures, including general provisions, buildings, bridges, and industrial structures. IS 1893 2016 is a revision of the previous version, IS 1893 2002, which was published after the 2001 Bhuj earthquake . IS 1893 2016 incorporates the latest research and developments in earthquake engineering, such as improved seismic zoning map, revised response spectra, modified soil classification, and updated design coefficient.

3. 2. Seismic Zoning Map The number of seismic zones has been reduced from five to four, by merging zones I and II into zone II. Some areas have been upgraded or downgraded to different seismic zones, based on the latest seismic data and hazard assessment. The seismic zone factors for some important towns have been given in Annex E of the code book.

4. Seismic zones of India

5. 3. Response Spectra The soil classification has been modified from five types (A, B, C, D, and E) to four types (I, II, III, and IV), based on the average shear wave velocity in the top 30 m of soil. The response spectra curves have been revised to account for the effects of near-fault ground motions, higher modes of vibration, and soil-structure interaction. The design horizontal acceleration spectrum has been given in a simplified form, which can be used for preliminary design and analysis.

6. 4. Design Coefficients The zone factor (Z) has been revised to reflect the revised seismic zoning map and response spectra. The importance factor (I) has been revised to include four categories of structures, based on their post-earthquake functional requirements and occupancy characteristics. The response reduction factor R has been revised to include more types of structural systems, such as steel-concrete composite, precast concrete, and masonry structures. The design horizontal coefficient (Ah) has been revised to include the effects of near-fault ground motions and higher modes of vibration.

7. 5. Conclusion IS 1893 2016 is an updated and improved version of the Indian Standard for earthquake resistant design of structures, which incorporates the latest research and developments in earthquake engineering. IS 1893 2016 provides the criteria for earthquake resistant design of structures, including general provisions, buildings, bridges, and industrial structures. IS 1893 2016 covers the aspects of seismic zoning map, response spectra, soil classification, and design coefficients, which are essential for the design and analysis of structures under earthquake loading.