Seismic Analysis of Intz Tank with Change in Seismic Zones

Abstract

A 10 lac liters of Intz type water tank is considered for this thesis work. The structural size was decided on the basis of the various literates studied and considering practical site considerations. For this purpose, types of loads and their intensities were considered as per the particular Indian code such as IS 875 part-01 and 02 for dead load and live load and IS 1893 part 01 for seismic loading on water tank. As these loading and loading combinations undergoes a tedious manual calculations structural design software Staad Pro. will be used for analysis and design. After detailed analysis it is found that Change in seismic severity has significant effect on the beam reaction in horizontal X direction with no change in horizontal Z-direction. Changes in seismic severity does not affect the moment values of structure from zone II to Zone III but a slight change was observed between the values of Zone III and Zone IV in Horizontal X and Z direction. An Increase of 261.53 % in the intensity of absolute pressure was observed as the severity changes from low to high, thus reflecting the significance of seismic severity.

Introduction

1. Introduction

• Purpose: Storage tanks/reservoirs are used for water, petroleum, and industrial liquids.

• Design Objective: All tanks must be crack-free to prevent leakage.

• Materials: Reinforced concrete is standard; petroleum products require special membranes due to leakage risks.

• Types:

  • Underground reservoirs for large storage.

  • Overhead tanks (like Intze type) for direct distribution via gravity.

2. Literature Review

• Shrutismita Talukdar et al.:

  • Used ANSYS, ETABS, and SAFE to model soil-structure interaction.

  • Found the structure safe with minimal deformation under seismic forces.

• Reshma Kulkarni et al.:

  • Developed a Java-based design tool.

  • Compared manual and automated designs; emphasized accuracy and efficiency with software.

• Asif Khan et al.:

  • Studied seismic and wind effects using STAAD Pro.

  • Found maximum bending moments mainly in the Z-direction across columns, ring beams, and tie beams.

• Chandana Imadabathuni et al.:

  • Designed Intze tank with STAAD Pro and found it structurally safe with reduced reinforcement compared to manual methods.

• Neha S. Vanjari et al.:

  • Designed circular overhead Intze tank using Limit State Method (IS 3370:2009).

  • Found it to be economical and long-lasting.

• Ketan Akolkar et al.:

  • Analyzed different staging systems under variable loads.

  • Concluded Intze tanks are more stable under seismic and wind forces.

3. Methodology

• A systematic workflow was followed for efficient and accurate analysis.

• Modeling and analysis were carried out using STAAD Pro considering various seismic zones and load conditions.

4. Case Consideration and Modeling

Tank Details

• Capacity: 1,000,000 liters (10 lakh liters)

• Design Parameters:

  • Concrete: M30

  • Steel: Fe-500

  • Seismic Zones: II to V

  • Bracing Beam Size: 500×500 mm

  • Column Dia: 650 mm

  • Cylindrical Wall Dia: 12.0 m

  • Top/Bottom Dome Thickness: 100 mm / 300 mm

  • Foundation Depth: 2.0 m

Model Labels

Load Considerations

• Seismic forces in X and Z directions

• Hydrostatic pressure on walls and bottom dome

5. Results and Discussion

A. Beam Reaction Comparison

• Reactions in X and Y directions increase with higher seismic zones.

• Z-direction reactions remain constant across models.

  • I-01 (Zone II): X = 1957 kN, Y = 497 kN

  • I-04 (Zone V): X = 2986 kN, Y = 643 kN

B. Beam Moment Comparison

• Z-direction moments are the highest and grow significantly with zone severity.

  • I-01: Z = 909.57 kNm

  • I-04: Z = 1162.03 kNm

C. Absolute Pressure (Seismic)

• Pressure increases steadily from Zone II to Zone V:

  • I-01: 0.52 N/mm²

  • I-04: 1.88 N/mm²

Conclusion

1) Change in seismic severity has significant effect on the beam reaction in horizontal X direction with no change in horizontal Z-direction. 2) Changes in seismic severity does not affect the moment values of structure from zone II to Zone III but a slight change was observed between the values of Zone III and Zone IV in Horizontal X and Z direction. 3) An Increase of 261.53 % in the intensity of absolute pressure was observed as the severity changes from low to high, thus reflecting the significance of seismic severity.

References

[1] Design, Analysis and Soil-Structure Interaction of an Intze Tank using ETABS, ANSYS and SAFE International Journal of Engineering Research & Technology (IJERT) http://www.ijert.org ISSN: 2278-0181 IJERTV7IS050231 (This work is licensed under a Creative Commons Attribution 4.0 International License.) Vol. 7 Issue 05, May-2018 Shrutismita Talukdar1 Tejaswini M.L.2 Kiran S.M.3 [2] Design Of Intze Water Tank Using Java Program International Journal Of Scientific & Engineering Research, Volume 7, Issue 7, July-2016 ISSN 2229-5518 Reshma Kulkarni , Prof.M.N.Mangulkar [3] Design of R.C.C over Head Tank International Engineering Journal For Research & Development Vol.1 Issue 2 Asif Khan [4] Analysis and Design of Intze Water Tank by Using STAAD Pro E3S Web of Conferences 309, 01178 (2021) ICMED 2021 Chandana Imadabathuni 1 , Padala Sri Vardhan Goud2 , Nalla Ravi Kiran3 , Bathula Naveen4 [5] Design of Circular Overhead Water Tank International Journal of Engineering Research in Mechanical and Civil Engineering (IJERMCE) Vol 2, Issue 7, July 2017 [1] Neha. S. Vanjari, [2] krutika. M. Sawant, [3] Prashant .S. Sisodiya, [4] S. B. Patil [6] A Review Paper On Wind Analysis Of Elevated Intze Tank Using Different Arrangements Of Bracing System International Research Journal of Modernization in Engineering Technology and Science Volume:04/Issue:04/April-2022 Ketan Ashok Akolkar*1, K.S. Patil*2 [7] Analysis of Intze Type Water Tank with Different Staging System & its Optimal Design GRD Journals | GRD Journal for Engineering | Emerging Research and Innovations in Civil Engineering (ERICE - 2019) | February 2019 e-ISSN: 2455-5703 1Affan M Ashfak Aakhunji 2Keval L Vanpariya [8] Design Of An Intze Tank For Axis Colleges Kanpur International Journal of Creative Research Thoughts (IJCRT © 2020 IJCRT | Volume 8, Issue 6 June 2020 | ISSN: 2320-2882 1Neelesh Kumar Verma. 2Prashant Kumar, 3Mohd Salman, 4Mohd Zaid Sabir, 5Mohd Shar [9] Dynamic Analysis of Intze Tank on Sloped Ground International Journal for Research in Engineering Application & Management (IJREAM) ISSN : 2454-9150 Vol-08, Issue-01, APR 2022 Deeksha Jain1 , Deepak Kumar Bandewar 2 , Sachin Jat 3 [10] Analysis of Different Types of Water Tank using Etabs International Journal of Scientific Development and Research (IJSDR) © October 2019 IJSDR | Volume 4, Issue 10 1 I.R. Saudagar, 2A.N. Shaikh [11] Design & Re-Strengthening of Intze Tank using Steel Jacketing in Perspective to Revision of Is Code International Journal for Scientific Research & Development| Vol. 6, Issue 11, 2019 | ISSN (online): 2321-0613 Nupur Gautam1 Rashmi Sakalle [12] Seismic Analysis and Design of INTZE Type Water Tank International Journal of Science Technology & Engineering | Volume 2 | Issue 03 | September 2015 Kaviti Harsha K. S. K Karthik Reddy Kondepudi Sai Kala [13] Study on Analysis & Design of Intz Water Tank a Review Paper International Journal of Trend in Scientific Research and Development (IJTSRD) Volume 4 Issue 1, December 2019 Available Online: www.ijtsrd.com e-ISSN: 2456 – 6470 Pammy Barnawal1, Nitesh Kushwaha2

Copyright

Copyright © 2025 Arati Ambhore, Dr. A. R. Gupta. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.