Investigation of Combined Steel-Concrete Structures with Inter-Story Seismic Isolator in Near-Fault Field

Document Type : Original Article

Authors

1 Shahid Beheshti University, Faculty of Civil, Water and Environmental Engineering, Department of Structure & Earthquake

2 Shahid Beheshti University, Faculty of Civil, Water and Environmental Engineering

3 Assistant Professor, Faculty of Civil & Environmental Engineering, Shahid Beheshti University, Tehran, Iran

Abstract

Seismic isolation systems represent one of the most effective solutions to reduce near-fault damages; the systems can be used at either foundation or story levels. The main advantage of seismic isolation system is that it increases fundamental period of structure to longer periods. Among other advantages of seismic isolators, one can refer to the dissipation of input energy into the structure which lowers the transmitted acceleration to the above structure. In the present research, performance of combined concrete-steel structures with or without seismic isolation systems at story level, are investigated under near-field earthquakes. For this purpose, three structures of 4, 7, and 10 stories with/without seismic Lead Rubber Bearing (LRB) isolation systems with different damping ratios and periods were modelled. The analysis results indicate that, the isolation systems of longer period and smaller damping ratio were associated with lower relative displacement, acceleration and base shear, improving the structure performance. Results of analysis show that, with increasing the structure height (compare the results of the 10 story building with those of the 4 and 7 story counterparts), variations in base shear is reduced in the models with different isolation systems; i.e. the taller the structure, the more faded the role of the isolator. Furthermore, a study of the variations of damping ratio and period of isolator makes it obvious that, with increasing the period of isolators, shear force of the stories in the isolated structures decreases, while it slightly increases with increasing the damping percentage of the isolator.

Keywords

Main Subjects

References

  1. Siahpolo, N. (2008). Dynamic investigation of seismic isolated buildings with seismic isolators, Conference on Civil Engineering Students across the country, Semnan, Iran.

 

  1. Mozafari Juibari, Y., Mahmudi, Y. (2012), The effect of the vertical component of near-field earthquake on the structures, The second national conference on structures, seismic and geotechnical, Babolsar, Iran.

 

  1. Amini, g., Kavoli, s., Salehi dobakhshari, M. (2011), The use of a damper on isolated structure under near-fault earthquake area, Sixth International Conference on Seismology and Earthquake Engineering, Tehran, Iran.

 

4. Tehrani zadeh, m., Hamedi, f., (1999). Seismic isolation against earthquakes, Publisher: International Institute of Earthquake Engineering and Seismology, Iran.

 

  1. David, M. L., (1980), BASE ISOLATION FOR TORSION REDUCTION IN ASYMMETRIC STRUCTURES UNDER EARTHQUAKE LOADING, Earthq. Eng.Struct. Dyn., Vol. 8, pp. 349–359.

 

  1. Chung, W., Yun, C., Kim, N., and Seo, J., (1999), Shaking table and pseudodynamic tests for the evaluation of the seismic performance of base-isolated structures, Eng.Struct., Vol. 21, pp. 365–379.

 

  1. Tena-Colunga, A., and Zambrana-Rojas, C., (2006), Dynamic torsional amplifications of base-isolated structures with an eccentric isolation system, Eng. Struct., Vol. 28, pp. 72–83.

 

  1. Jangid, R. S., (2007), Optimum lead–rubber isolation bearings for near-fault motions, Eng. Struct., Vol. 29, pp. 2503–2513.

 

  1. Providakis, C. P., (2008), Pushover analysis of base-isolated steel–concrete composite structures under near-fault excitations, Soil Dyn. Earthq. Eng., Vol. 28, pp. 293–304.

 

  1. Alhan, C., and Altun, M., (2009), PERFORMANCE OF NON-LINEAR BASE ISOLATION SYSTEMS DESIGNED ACCORDING TO UNIFORM BUILDING CODE, 5th Int. Adv. Technol. Symp. (IATS’09), Karabuk, Turkey.

 

  1. Hamaguchi, H., Samejima, Y., and Kani, N., (2009), A study of aging effect on a rubber bearing after about twenty years in use, 11th World Conf. Seism. Isol. Energy Dissipation Act. Vib. Control Struct. Guangzhou, China, pp. 393–398.

 

  1. Sharbatdar, M. K., Hoseini Vaez, S. R., Ghodrati Amiri, G., and Naderpour, H., (2011), Seismic Response of Base-Isolated Structures with LRB and FPS under near Fault Ground Motions, Procedia Eng., Vol. 14, pp. 3245–3251.

 

  1. Akbarpour Nikghalb, A., Adib, M. Z., Asgari, M. (2010). Modeling of dynamic behaviors of asymmetric isolated steel-braced structures under multi-component seismic loads. National Conference of Civil Engineering and Sustainable Development, Estahban, Iran.

 

  1. Vaseghi Amiri, J., Esma’eil zade toluei, S. (2011). Isolators performance of the steel structure with base isolated pendulum friction under non-linear static analysis. The Sixth National Congress of Civil Engineering, Semnan, Iran.

 

  1. Madadi, Y., Hagh ola’hi, A. (2011), Performance evaluation of isolators in concrete structures using dynamic analysis. Retrofit and rehabilitation of Civil magazine, Number 19, p. 12-20.

 

  1. Ghaffari, A., Hashemi, S. A., (2004). Seismotectonic isolators. The 11th Student Conference on Civil Engineering, Bandar Abbas, Iran.

 

  1. Building & Housing Research Center (BHRC) of Iran (2014), “Iranian code of practice for seismic resistant design of buildings standard No. 2800”, 4rd edition, Iran.

 

  1. Islamic Republic of Iran Vice Presidency for Strategic Planning and Supervision (2011), Guideline for Design and Practice of Base Isolation Systems in Buildings, (Publication No. 523), First Edition, Tehran, Iran.

 

  1. Joern Scheller and Michael C. Constantinou , Response History Analysis of Structures with Seismic Isolation and Energy Dissipation Systems: Verification Examples for Program SAP2000, University at Buffalo, State University of New York, School of Civil, Structural and Environmental Engineering, Technical Report MCEER-99-0002, February 22, 1999.

 

  1. A.B.M. Saiful Islam, Raja Rizwan Hussain, Mohammed Jameel, Mohd Zamin Jumaat, Non-linear time domain analysis of base isolated multi-storey building under site specific bi-directional seismic loading, Automation in Construction 22 (2012) 554–566, Journal homepage: www.elsevier.com/locate/autcon

 

  1. Dia Eddin Nassani, Mustafa Wassef Abdulmajeed, Seismic Base Isolation in Reinforced Concrete Structures, International Journal of Research Studies in Science, Engineering and Technology Volume 2, Issue 2, February 2015, PP 1-13.

 

  1. T. Subramani, J. Jothi, M. Kavitha, Earthquake Analysis of Structure by Base Isolation Technique in SAP,

Journal of Engineering Research and Applications, Vol. 4, Issue 6 (Version 5), June 2014, pp.296-305.

Journal of Structural and Construction Engineering
Volume 7, Issue 3 - Serial Number 34
September 2020
Pages 148-164

Files

History

  • Receive Date: 05 March 2018
  • Revise Date: 21 August 2018
  • Accept Date: 12 October 2018

Share

How to cite

Statistics