Surajkumar Mohanlal Harne,
S. A. Bhalchandra,
- Student Department of Applied Mechanics,Government College of Engineering Chhatrapati Sambhajinagar,Maharashtra,India
- Professor Department of Applied Mechanics,Government College of Engineering Chhatrapati Sambhajinagar,Maharashtra,India
Abstract
India is a developing country, more than 50% of Indian population lives in unreinforced masonry structures. Masonry structures are vulnerable to seismic loading and load acting in it’s out of plane, hence performs poorly and sometimes leads to sudden collapse. Collapse of structure not only damages public property but also costs the lives of people. Base isolation techniques for these types of structure can be proven to be beneficial, in case of seismic forces it will lead to a performance objective for masonry structures.
The objective of this study is to identify the behaviour and failure mechanism of masonry structure under lateral forces due to earthquake, to develop a simple base isolation system for it and to study the effectiveness of the base isolation system. Four different shape structures are considered for study namely square, rectangular, C and E shape. Both the fixed base and base isolated models are prepared for analysis purposes in SAP2000 software. Two different types of isolators are taken for the base isolation namely lead rubber bearing and marble-marble material interface as friction isolator. The equivalent stiffness links of these isolators are provided at four corners of each structure. Time history analysis is performed in SAP2000 on all the eight models and results are obtained. It is observed that there is reduction in forces and seismic response in case of base isolated structure. It is observed that the base isolation system is very effective in reducing the seismic response of masonry structures.
Keywords: LRB- Lead rubber Bearing, Friction Isolator, Time History Analysis, SAP2000
References
1. Corradil M, Borri A. A database of the structural behavior of masonry in shear. Bull Earthquake Engineering. 2018;16(12):5659-5690. doi:10.1007/s10518-018-0328-6.
2. Habieb AB, Valente M, Milani G. Hybrid seismic base isolation of a historical masonry church using unbonded fiber reinforced elastomeric isolators and shape memory alloy wires. Engineering Structures. 2019;196:109281. doi:10.1016/j.engstruct.2019.109281.
3. Aldemir A, Binici B, Canbay E, Yakut A. In Situ Lateral Load Testing of a Two-Story Solid Clay Brick Masonry Building. Journal of Performance of Constructed Facilities. 2018;32(3):04018028. doi:10.1061/(ASCE)CF.1943-5509.0001206.
4. Pohoryles DA, Bournas DA, Da Porto F, Caprino A, Santarsiero G, Triantafillou T. Integrated seismic and energy retrofitting of existing buildings: A state-of-the-art review. Journal of Building Engineering. 2022;61:105274. doi:10.1016/j.jobe.2022.105274.
5. Zhang C, Ali A, Sun L. Investigation on low-cost friction-based isolation systems for masonry building structures: Experimental and numerical studies. Engineering Structures. 2021;243:112645. doi:10.1016/j.engstruct.2021.112645.
6. Vlachakis G, Vlachaki E, Lourenco PB. Learning from failure: Damage and Failure of Masonry Structures, after the 2017 Lesvos Earthquake (Greece). Engineering Failure Analysis. 2020;114:104803. doi:10.1016/j.engfailanal.2020.104803.
7. Nanda RP, Shrikhande M, Agarwal P. Low-Cost Base-Isolation System for Seismic Protection of Rural Buildings. Practice Periodical on Structural Design and Construction. 2015;20(2):04015001. doi:10.1061/(ASCE)SC.1943-5576.0000245.
8. Doudoumis IN, Papadopoulos P, Papaliangas T. A Low-Cost Base-Isolation System on Artificial Soil Layers with Low Shearing Resistance. 12th European Conference on Earthquake Engineering. 2022:1-12. Elsevier.
9. Islam ABMS, Ahmad SI, Jameel M, Zamin MJ. Seismic Base Isolation for Buildings in Regions of Low to Moderate Seismicity: Practical Alternative Design. Practice Periodical on Structural Design and Construction. 2012;17(1):82-93. doi:10.1061/(ASCE)SC.1943-5576.0000093.
10. Ahmad S, Ghani F, Adil MR. Seismic friction base isolation performance using demolished waste in masonry housing. Construction and Building Materials. 2009;23(1):146-152. doi:10.1016/j.conbuildmat.2008.01.012.
11. Sachdeba G, Chakraborty S, Ray-Chaudhuri S. Seismic response control of a structure isolated by flat sliding bearing and nonlinear restoring spring: Experimental study for performance evaluation. Construction and Building Materials. 2017;145:249-260. doi:10.1016/j.conbuildmat.2017.03.192.
12. Zhang C, Ali A. The advancement of seismic isolation and energy dissipation mechanisms based on friction. Soil Dynamics and Earthquake Engineering. 2021;146:106746. doi:10.1016/j.soildyn.2021.106746.
13. Ngo T, Dutta A. Mitigation of Seismic Vulnerability of Prototype Low-Rise Masonry Building Using U-FREIs. Journal of Performance of Constructed Facilities. 2017;31(3):04017013. doi:10.1061/(ASCE)CF.1943-5509.0001136.
14. IS 1893. (Part 1). Criteria for earthquake resistance design of structures, Part 1 general provisions and Buildings (sixth revision). BIS, New Delhi, India; 2016.
15. IS 1905. Code of practice for structural use of unreinforced masonry (third revision). BIS, New Delhi, India; 1987.
16. Hendry A, Sinha B, Davies S. Design of masonry structures. London, UK: E & FN Spon; 1997.
17. IS 456. Plain and reinforced concrete-code of practice (fourth revision). BIS, New Delhi, India; 2000.
18. CSI. SAP2000. Three-Dimensional static and dynamic finite element analysis and design of structures, version 7.4.2. Pennsylvania, USA: Computer and Structures Inc.; 2017.
Journal of Structural Engineering and Management
| Volume | |
| Received | July 11, 2024 |
| Accepted | July 16, 2024 |
| Published | July 18, 2024 |