Comparative Study of Wind and Seismic Effects on Multi-Story Buildings in Jharkhand Using ETABS

Comparative Study of Wind and Seismic Effects on Multi-Story Buildings in Jharkhand Using ETABS

Harsh Raj

B. Tech (NIT Warangal, Telangana)

Abstract: In recent years, Jharkhand has experienced rapid urban development, leading to a significant increase in the construction of multi-story residential and commercial buildings, particularly apartment complexes in major cities such as Ranchi, Jamshedpur, and Dhanbad. As the number and height of these structures continue to grow, it becomes increasingly important to ensure their safety and stability against lateral loads such as wind and earthquakes. Wind forces can significantly affect the structural behavior of tall buildings, especially in rapidly developing urban regions. This study focuses on the comparative analysis of wind and seismic effects on multi-story reinforced concrete buildings in Jharkhand using ETABS software. A typical multi-story apartment building model is developed and analyzed by considering gravity loads along with wind loads as per IS 875 (Part 3) and seismic loads as per IS 1893. Key structural parameters such as story displacement, story drift, base shear, and overall structural performance are evaluated under both wind and earthquake loading conditions. The results obtained from the analysis provide a clear understanding of the influence of wind and seismic forces on building performance in the Jharkhand region. The study highlights the importance of considering both wind and earthquake loads during the design process to ensure structural safety, stability, and serviceability of multi-story buildings. The findings of this research can support engineers and planners in designing safer and more efficient buildings in the rapidly urbanizing areas of Jharkhand.

INTRODUCTION:

ETABS (Extended Three-Dimensional Analysis of Building Systems) is one of the most widely used software programs in structural engineering for the analysis and design of multi-story buildings. In modern construction, buildings are becoming taller and more complex, which makes manual structural calculations difficult and time-consuming. ETABS helps engineers create a three- dimensional model of a building and analyze its structural behavior under different loads such as dead load, live load, wind load, and earthquake load. One of the main advantages of ETABS is its ability to perform accurate and efficient structural analysis in a short time. It provides important results such as story displacement, story drift, base shear, and internal forces in structural members. These results help engineers understand how a building behaves under different loading conditions and allow them to design safer and more economical structures. In todays rapidly developing construction industry, the use of ETABS has become essential for designing multi-story buildings. It improves accuracy, reduces calculation time, and helps engineers ensure the safety and stability of structures. Therefore, ETABS plays an important role in modern structural analysis and building design.

Keywords:

Wind Load, Seismic Load, ETABS Software, Multi-Story Buildings, Structural Analysis, Story Displacement, Story Drift, Base Shear.

AIM OF THE STUDY:

The main aim of this study is to analyze and compare the effects of wind and seismic loads on multi-story buildings using ETABS software. The study focuses on understanding how these lateral forces influence the structural behavior of buildings, including parameters such as displacement, drift, and base shear. By using ETABS for structural modeling and analysis, the research aims to evaluate the performance of buildings under wind and earthquake loading conditions and highlight the importance of considering these forces for safe and efficient building design.

Comparison of Wind and Seismic Loads on Multi-Story Buildings in Jharkhand

Table 1 Comparison of Wind and Seismic Loads on Multi-Story Buildings in Jharkhand.

DATA ANALYSIS:

Based on the collected data for Ranchi, Jamshedpur, and Dhanbad, the structural response of multi-story buildings under wind and seismic loads is analyzed using ETABS software. The basic wind speed for Ranchi and Dhanbad is approximately 140 km/h, while Jamshedpur has a slightly higher wind speed of 158 km/h according to IS 875 (Part 3). Due to this higher wind speed, buildings located in Jamshedpur are expected to experience greater wind pressure, which may lead to higher lateral displacement and story drift.In terms of seismic conditions, Ranchi and Jamshedpur fall under Seismic Zone II, which indicates a relatively lower earthquake risk. However, Dhanbad is located in Seismic Zone III, meaning that buildings in this region are subjected to higher seismic forces and require more careful earthquake-resistant design. From the ETABS analysis parameters such as wind load, story displacement, and story drift, it can be observed that wind effects are more significant in Jamshedpur due to higher wind speed, while seismic effects become more important in Dhanbad because of its higher seismic zone classification.

DISCUSSION:

Based on the data presented in Table 1, the wind and seismic conditions of Ranchi, Jamshedpur, and Dhanbad have been compared using Indian Standard codes. Jamshedpur has the highest basic wind speed (158 km/h), indicating greater wind effects on buildings. Ranchi and Jamshedpur fall under Seismic Zone II, while Dhanbad lies in Seismic Zone III, showing higher earthquake risk. Therefore, wind load influence is more significant in Jamshedpur, whereas seismic considerations are more important for buildings in Dhanbad. These factors are important for safe structural design using ETABS.

ETABS Results Comparison Ranchi, Jamshedpur, Dhanbad City: Table 2 ETABS Results Comparison.

CONCLUSION:

Based on Table 01 (city-wise parmeters such as basic wind speed and seismic zone) and Table 02 (ETABS analysis results including wind load, displacement, story drift, and base shear), the structural behavior of multi-story buildings in Ranchi, Jamshedpur, and Dhanbad can be compared. The analysis shows that Jamshedpur experiences the highest wind speed (158 km/h) among the selected cities, which results in comparatively higher wind load, story displacement, and story drift values in the ETABS analysis. This indicates that wind effects play a more significant role in the structural design of buildings in Jamshedpur. In Ranchi, the wind speed is moderate (140 km/h) and the city lies in Seismic Zone II, which means both wind and earthquake effects are relatively moderate. Therefore, buildings in Ranchi generally experience balanced lateral loading conditions. On the other hand, Dhanbad lies in Seismic Zone III, which indicates a higher seismic risk compared to Ranchi and Jamshedpur. Even though the wind speed is similar to Ranchi, the base shear value is comparatively higher due to seismic considerations, making earthquake- resistant design more important for buildings in this region. Overall, the comparative analysis using ETABS shows that wind load has greater influence in Jamshedpur, while seismic effects are more critical in Dhanbad. Ranchi experiences moderate effects of both wind and seismic loads. Therefore, proper consideration of both IS 875(Part 3) for wind load and IS 1893 for seismic load is essential for the safe and efficient design of multi-story buildings in Jharkhand.

Duration of Case Study:

Table 2 Case Study Duration. ACKNOWLEDGEMENT:

The authors sincerely acknowledge RTBT Infrastructure Developer Pvt. Ltd., Ranchi (www.rtbtltd.com) for their valuable technical support and cooperation during the present study on the comparative analysis of wind and seismic effects on multi- story buildings in Ranchi, Jamshedpur, and Dhanbad using ETABS software

REFERENCES:

1. Bureau of Indian Standards (BIS). (2015). IS 875 (Part 3): Code of Practice for Design Loads (Other than Earthquake) for Buildings and Structures Wind Loads. New Delhi, India.

2. Bureau of Indian Standards (BIS). (2016). IS 1893 (Part 1): Criteria for Earthquake Resistant Design of Structures. New Delhi, India.

3. CSI (Computers and Structures Inc.). (2021). ETABS User Guide Integrated Building Design Software. Berkeley, California, USA.

4. Duggal, S. K. (2013). Earthquake Resistant Design of Structures. Oxford University Press, New Delhi.

5. Hibbeler, R. C. (2017). Structural Analysis. Pearson Education.

6. Chopra, A. K. (2012). Dynamics of Structures: Theory and Applications to Earthquake Engineering. Pearson Education.

7. Smith, B. S., & Coull, A. (1991). Tall Building Structures: Analysis and Design. John Wiley & Sons.

8. RTBT Infrastructure Developer Pvt. Ltd. (2026). Technical guidance and structural engineering practices for building analysis in Jharkhand region. Ranchi, India. Available at: www.rtbtltd.com.