Mechanical Characteristics and Modeling of Multiple Trench Friction Pendulum System with Multi-intermediate Sliding Plates

Authors: C. S. Tsai, Yung-Chang Lin

Abstract:

In order to upgrade the seismic resistibility of structures and enhance the functionality of an isolator, a new base isolator called the multiple trench friction pendulum system (MTFPS) is proposed in this study. The proposed MTFPS isolator is composed of a trench concave surface and several intermediate sliding plates in two orthogonal directions. Mathematical formulations have been derived to examine the characteristics of the proposed MTFPS isolator possessing multiple intermediate sliding plates. By means of mathematical formulations, it can be inferred that the natural period and damping effect of the MTFPS isolator with several intermediate sliding plates can be altered continually and controllably during earthquakes. Furthermore, results obtained from shaking table tests demonstrate that the proposed isolator provides good protection to structures for prevention of damage from strong earthquakes.

Keywords: Friction Pendulum System, Multiple Friction Pendulum System, Base Isolation, Earthquake Engineering

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1056376

References:

[1] Zayas VA, Low SS and Mahin SA. The FPS earthquake resisting system report. EERC Technical Report, UBC/EERC-87/01, 1987.
[2] Tsai CS. Seismic behavior of buildings with FPS isolators. Second Congress on Computing in Civil Engineering (ASCE), Atlanta, GA, 1995; 1203-1211.
[3] Tsai CS. Finite element formulations for friction pendulum isolation bearings. International Journal for Numerical Method in Engineering 1997; 40:29-49.
[4] Al-Hussaini TM, Zayas VA and Constantinou MC. Seismic isolation of multi-story frame structures using spherical sliding isolation systems. Technical Report, NCEER-94-0007, 1994.
[5] Jangid RS. Optimum friction pendulum system for near-fault motions. Engineering Structures 2005; 27:349-359.
[6] Tsai CS, Chiang TC and Chen BJ. Finite element formulations and theoretical study for variable curvature friction pendulum system. Engineering Structures 2003; 25:1719-1730.
[7] Tsai CS, Chiang TC and Chen BJ. Seismic behavior of MFPS isolated structure under near-fault sources and strong ground motions with long predominant periods. In: the 2003 ASME Pressure Vessels and Piping Conference, Seismic Engineering, Chen, J. C. (ed.), Cleveland, Ohio, U. S. A., July, 2003; 466:73-79.
[8] Tsai CS, Chiang TC and Chen BJ. Shaking table tests of a full scale steel structure isolated with MFPS. In: the 2003 ASME Pressure Vessels and Piping Conference, Seismic Engineering, Chen, J. C. (ed.), Cleveland, Ohio, U. S. A., July, 2003; 466:41-47.
[9] Tsai CS, Chen BJ, Pong WS and Chiang TC. Interactive behavior of structures with multiple friction pendulum isolation system and unbounded foundations", Advances in Structural Engineering, An International Journal 2004; 7(6):539-551.
[10] Tsai CS, Chiang TC, Chen BJ. Experimental evaluation piecewise exact solution for predicting seismic responses of spherical sliding type isolated structures. Earthquake Engineering and Structural Dynamics 2005; 34(9):1027-1046.
[11] Tsai CS, Cheng CK, Chen MJ and S. H. Yu SH. Experimental study of MFPS-isolated sensitive equipment. In: the 2003 ASME Pressure Vessels and Piping Conference, Seismic Engineering, ASME, Edited by C. S. Tsai, Denver, Colorado, U.S.A., July 17-21, 2005, 8:11-18.
[12] Tsai CS, Chen WS, Chiang TC and Chen BJ. Component and shaking table tests for full-scale multiple friction pendulum system. Earthquake Engineering and Structural Dynamics 2006; 35(11):1653-1675.
[13] Kim YS and Yun CB. Seismic response characteristics of bridges using double concave friction pendulum bearings with tri-linear behavior. Engineering Structures 2007; 29:3082-3093.
[14] Tsai, CS. Improved structures of base isolation systems. Taiwan Patent No. 207126, Publication Number 00542278, Publication Date: July 11, 2003, Application Number 091210175, Filing date: July4, 2002 (in Chinese).
[15] Tsai CS, Lu PC, Chen W S, Chiang TC, Yang CT and Lin YC. Finite element formulation and shaking table tests of direction-optimized friction pendulum system. Engineering Structures 2008; 30:2321-2329.
[16] Fenz DM and Constantinou MC. Spherical sliding isolation bearings with adaptive behavior: Theory. Earthquake Engineering and Structural Dynamics 2008; 37:168-183.
[17] Morgan TA and Mahin SA. The optimization of multi-stage friction pendulum isolators for loss mitigation considering a range of seismic hazard. In: the 14th World Conference on Earthquake Engineering, Beijing, China, October 12-17, 2008; Paper No. 11-0070.
[18] Tsai, CS, Lu PC and Chen WS. Shaking table tests of a building isolated with a trench friction pendulum system. In: the 2006 ASME Pressure Vessels and Piping Conference, Seismic Engineering, Cory, James. F. (ed.), Vancouver, BC, Canada, July, 2006; Paper No. PVP2006-ICPVT11-93253.
[19] Tsai CS, Lin YC and Chen WS. Seismic behavior of high-tech facility isolated with a trench friction pendulum system. In: the 2006 ASME Pressure Vessels and Piping Conference, Seismic Engineering, Cory, James. F. (ed.), Vancouver, BC, Canada, July, 2006; Paper No. PVP2006-ICPVT11-93474.