Study and Comparison of Seismic Behaviour of Isolator-Damper Hybrid Control System with Conventional Structural Systems

Document Type : Regular Paper

Authors

1 Graduated Master in Structural Engineering, Imam Khomeini International University, Qazvin, Iran

2 Assistant Professor, Structural Engineering, Imam Khomeini International University, Qazvin, Iran

Abstract

In this paper, in addition to introduce a hybrid structural system contained local isolators and dampers, its behavior and functional capabilities were studied on a conventional structure. For this purpose, an RC frame building with six-story was designed based on valid codes and then, in four cases based on the number of spans, it was split into two separate adjacent frames. Base isolation was done underneath the columns of one frame, while the bottom connections of the other frame’s columns were remained fixed and viscous dampers provided the connection of two adjacent frames on the same floors. Nonlinear time history analysis (NTHA) under three near-fault and three far-fault earthquakes and frequency-domain analysis are performed. Displacement, drift, acceleration and shear forces of the stories in the four proposed hybrid cases with two limited cases, full base-isolated and full base-fixed frames, as well as nonlinear hysteresis behavior of a damper and an isolator are assessed. The results showed that using the novel hybrid control method in most cases can mitigate deteriorating effects of all types of seismic motions observed in the conventional structural systems. However, among them, two cases (2 isolated columns -5 fixed columns and 3 isolated columns -4 fixed columns) had the best significant influence on seismic performance and structural response reduction. Furthermore, frequency response functions of displacement and acceleration with respect to ground acceleration demonstrated that the two proposed cases further suppress the responses of the limited cases, over a wide range of frequencies including all natural frequencies. Due to decrease about 50-70% in the number of base isolators (compared to full isolation) lead to considerable construction cost savings. In spite of the limitation of ASCE7-10 code on separately using base isolators and dampers on structure, applying the proposed combination technique of these two dissipating devices can overcome the limitation.

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Main Subjects


[1] Naeim, F., & Kelly, J. M. (1999). Design of seismic isolated structures: from theory to practice. John Wiley & Sons.
[2] Kilar, V., & Koren, D. (2009). Seismic behaviour of asymmetric base isolated structures with various distributions of isolators. Engineering structures, 31(4), 910-921.
[3] Afshar, M. A., & Aghaeipour, S. (2016). On inertia nonlinearity in irregular-plan isolated structures under seismic excitations. Journal of Sound and Vibration, 363, 495-516.
[4] Harvey Jr, P. S., & Kelly, K. C. (2016). A review of rolling-type seismic isolation: Historical development and future directions. Engineering Structures, 125, 521-531.
[5] Radkia, S., Rahnavard, R., & Gandomkar, F.A. (2018) Evaluation of the effect of different seismic isolators on the behavior of asymmetric steel sliding structures. Journal of Structural and Construction Engineering (Article In Press) DOI: 10.22065/jsce.2018.114089.1428.
[6] Ni, Y. Q., Ko, J. M., & Ying, Z. G. (2001). Random seismic response analysis of adjacent buildings coupled with non-linear hysteretic dampers. Journal of Sound and Vibration, 246(3), 403-417.
[7] Patel, C. C., & Jangid, R. S. (2010). Seismic response of dynamically similar adjacent structures connected with viscous dampers. The IES Journal Part A: Civil & Structural Engineering, 3(1), 1-13.
[8] Takewaki, I. (2007). Earthquake input energy to two buildings connected by viscous dampers. Journal of Structural Engineering, 133(5), 620-628.
[9] Hwang, J. S., Wang, S. J., Huang, Y. N., & Chen, J. F. (2007). A seismic retrofit method by connecting viscous dampers for microelectronics factories. Earthquake engineering & structural dynamics, 36(11), 1461-1480.
[10] Li, H., Wang, S. Y., Song, G., & Liu, G. (2004). Reduction of seismic forces on existing buildings with newly constructed additional stories including friction layer and dampers. Journal of sound and vibration, 269(3-5), 653-667.
[11] Passoni, C., Belleri, A., Marini, A., & Riva, P. (2014). Existing structures connected with dampers: state of the art and future developments. In 2ECEES: 2nd European Conference on Earthquake Engineering and Seismology, Istanbul, Turkey, 24-29 August 2014. EAEE (European Association of Earthquake Engineering).
[12] Matsagar, V. A., & Jangid, R. S. (2003). Seismic response of base-isolated structures during impact with adjacent structures. Engineering Structures, 25(10), 1311-1323.
[13] Matsagar, V. A., & Jangid, R. S. (2005). Viscoelastic damper connected to adjacent structures involving seismic isolation. Journal of civil engineering and management, 11(4), 309-322.
 [14] Bharti, S. D., Dumne, S. M., & Shrimali, M. K. (2010). Seismic response analysis of adjacent buildings connected with MR dampers. Engineering Structures, 32(8), 2122-2133.
[15] Shrimali, M. K., Bharti, S. D., & Dumne, S. M. (2015). Seismic response analysis of coupled building involving MR damper and elastomeric base isolation. Ain Shams Engineering Journal, 6(2), 457-470.
[16] Kasagi, M., Fujita, K., Tsuji, M., & Takewaki, I. (2016). Automatic generation of smart earthquake-resistant building system: hybrid system of base-isolation and building-connection. Heliyon, 2(2), e00069.
[17] Hayashi, K., Fujita, K., Tsuji, M., & Takewaki, I. (2018). A Simple Response Evaluation Method for Base-Isolation Building-Connection Hybrid Structural System under Long-Period and Long-Duration Ground Motion. Frontiers in Built Environment, 4, 2.
[18] Amini, F., Mohajeri, S. A., & Javanbakht, M. (2015). Semi-active control of isolated and damaged structures using online damage detection. Smart Materials and Structures, 24(10), 105002.
 [19] American Concrete Institute. (2014). Building Code Requirements for Structural Concrete (ACI 318-14): Commentary on Building Code Requirements for Structural Concrete (ACI 318R-14): an ACI Report. American Concrete Institute. ACI.
[20] American Society of Civil Engineers (ASCE). (2010). ASCE7-10: Minimum Design Loads for Buildings and Other Structures.
[21] Council, B. S. S. (2006). NEHRP recommended provisions: Design examples (FEMA 451). Federal Emergency Management Agency, Washington, DC.
[22] Frankel, A. (1996). USGS national seismic maps: documentation. USGS Open File Report, 96-532.
[23] Kandemir-Mazanoglu, E. C., & Mazanoglu, K. (2017). An optimization study for viscous dampers between adjacent buildings. Mechanical Systems and Signal Processing, 89, 88-96.
[24] FEMA, P. 695 (2009) Quantification of building seismic performance factors. Federal Emergency Management Agency, Washington.
[25] Charney, F. A. (2015, February). Seismic Loads: Guide to the Seismic Load Provisions of ASCE 7-10. American Society of Civil Engineers.