Enhancing Seismic Performance of Semi-Commercial Apartment having Telecommunication Tower at Roof

Abstract

When studying the impact of seismic activities on a structure, we focused on the efficient case and didn\'t consider the worst-case scenario. If a telecommunication tower is planned on a multistoried building in the future, and the tower is in the worst possible location, certain measures need to be taken to stabilize it and adjust the parametric values. In this research, we analyzed a total of 5 semi-commercial apartment building cases with G+19 floors, each having different telecommunication tower locations. After the analysis, we identified the worst case and implemented an outrigger system, as discussed in the graphical representations in the discussion section. In conclusion, we compared parametric results and observed that Case TTD is very efficient, while Case TTA is the worst among all the cases. We also improved the stability of the worst-case TTA and transformed it into Case TTO through the implementation of the outrigger system, as indicated by our results and discussions.

Introduction

I. INTRODUCTION

When considering the safety of human civilization, earthquakes emerge as a major threat, causing harm to lives, structures, and property. Worldwide, ongoing experimental efforts aim to address this issue and create environments that can withstand earthquakes, ensuring a secure and hassle-free life. Modern structures are designed with special techniques to withstand earthquake forces, often at a higher manufacturing cost.

In India, the common practice for constructing tall buildings is using a reinforced concrete frame. The country is divided into earthquake zones (Zone II, III, IV, and V), and structures in these zones need to be analyzed and designed with extra stiffness and ductility to minimize damage. Steel bracing arrangements within the frame structure are used to reduce lateral effects, providing strength, stiffness, and architectural appeal. Bracings are crucial for resisting movement in structures.

Another element to enhance stiffness in construction is the shear wall, typically located around the lift area in what is known as the core-type shear wall system. Shear walls not only increase stiffness but also enhance stability against overturning and reduce lateral effects. Following Taranath's approach, shear walls can serve as an outrigger system to minimize deflection and mitigate the worst effects of lateral forces.

This system can be implemented at 0.466 of the structural height, combining shear wall outriggers with shear core to form a comprehensive outrigger system.

II.  PROCEDURE AND 3D MODELLING OF THE STRUCTURE

An earthquake analysis was conducted on a G+19 storey semi commercial apartment using a software-based approach. Five different models were created in the software, initially placing the tower in various positions atop the apartment. Subsequently, the most efficient and worst-case scenarios were identified, and optimization measures were applied to the parameters of the worst-case using an Outrigger system.

The analysis involved assessing the impact on the building under different loads, including dead load, live load, and lateral loads such as those from earthquakes and wind, using the software's mechanisms. Seismic data conforming to IS 1893(PART1):2016 standards was utilized, and the analysis employed the response spectrum analysis method to evaluate the building's behavior.

V.  ACKNOWLEDGEMENT

I, Shantilal Katare, M. Tech. Scholar, would like to thank Prof. Prachi Chincholikar, Assistant Professor, Department of Civil Engineering, Vikrant Institute of Technology and Management, Indore (M.P.), India, for her valuable guidance from the commencement of the work up to the completion of the work along with her encouraging thoughts.

Conclusion

The conclusion can be pointed out are as follows:- 1) The least nodal displacement for X and Z directions for the semi commercial apartment is observed in Model Case TTB. 2) When determining the Base Shear for both X and Z directions, the Base Shear values observed least in Case TTC for X and TTD for Z directions respectively. 3) When comparing the mass participation factor in both X and Z directions, the maximum mass over time is taken into account. The optimal case is Case TTB and Case TTD, while the worst case is Case TTA for both X and Z direction. 4) In Column Axial Forces, Case TTB performs the best, and Case TTD is the least favorable when compared among all cases. 5) In Column Shear Forces, Case TTD performs the best, and Case TTA is the least favorable when compared among all cases. 6) In Column Bending Moment, Case TTD performs the best, and Case TTA is the least favorable when compared among all cases. 7) In Beam Shear Forces, Case TTA performs the best, and Case TTC is the least favorable when compared among all cases. 8) In Beam Bending Moment, Case TTD performs the best, and Case TTB is the least favorable when compared among all cases. 9) In Beam Torsional Moment, Case TTD performs the best, and Case TTA is the least favorable when compared among all cases. In general, it is noticed that Case TTD is the most efficient among all the cases. Additionally, we improved the stability of the worst-case scenario, Case TTA, based on our findings and discussions by adding an outrigger system. Therefore, the most appropriate location for the tower had always been taken but the worst case if taken should be re-structured first, taking into account various result parameters, we attempted to reduce the adverse effects in certain parameters by incorporating outrigger walls and erected the worst case to TTO with better outcomes.

References

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Copyright

Copyright © 2024 Shantilal Katare, Prof. Prachi Chincholikar. 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.