Experimental Studies on Real-Time Testing of Structures with Elastomeric Dampers
Publication: Journal of Structural Engineering
Volume 135, Issue 9
Abstract
Real-time pseudodynamic (PSD) and hybrid PSD methods are a means to evaluate structural performance under dynamic loading when a component of a structural system cannot be accurately modeled and is load rate dependent. The real-time PSD and hybrid PSD testing of structures with full-scale elastomeric dampers is presented. A Bode diagram of the complete real-time testing system is used to design a velocity feed forward component that improves the tracking performance of the command displacements by the hydraulic actuator. To evaluate the accuracy of the tests, an on-line error tracking indicator is developed to monitor errors due to actuator lag or lead together with an amplitude indicator to reveal the amplitude errors in actuator measured displacements. The results from the real-time PSD and hybrid PSD tests are presented and evaluated using the error tracking indicators. The stability limits associated with a time delay for the tests are discussed and compared with delays that occurred in the tests.
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Acknowledgments
This paper is based upon work supported by a grant from the Pennsylvania Department of Community and Economic Development through the Pennsylvania Infrastructure Technology Alliance Project No. UNSPECIFIED540987, and by the National Science Foundation (NSF) under Grant No. UNSPECIFIEDCMS-0402490 within the George E. Brown, Jr. Network for Earthquake Engineering Simulation Consortium Operation. The writers would like to express their appreciation to Thomas Marullo and Dr. Sougata Roy of ATLSS Research Center for their contributions during the experimental study reported here. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the sponsors.
References
Bonnet, P. A., Lim, C. N., Williams, M. S., Blakeborough, A., Neild, S. A., Stoten, D. P., and Taylor, C. A. (2007). “Real-time hybrid experiments with newmark integration, MCSmd outer-loop control and multi-tasking strategies.” Earthquake Eng. Struct. Dyn., 36, 119–141.
Darby, A. P., Blakeborough, A., and Williams, M. S. (1999). “Real-time substructure tests using hydraulic actuator.” J. Eng. Mech., 125(10), 1133–1139.
Darby, A. P., Williams, M. S., and Blakeborough, A. (2002). “Stability and delay compensation for real-time substructure testing.” J. Eng. Mech., 128, 1276–1284.
Dermitzakis, S. N., and Mahin, S. A. (1985). “Development of substructuring techniques for online computer controlled seismic performance testing.” Rep. No. UCB/EERC-85/04, Earthquake Engineering Research Center, Berkeley, Calif.
Hilber, H. M., Hughes, T. J. R., and Taylor, R. L. (1977). “Improved numerical dissipation for time integration algorithms in structural dynamics.” Earthquake Eng. Struct. Dyn., 5, 283–292.
Horiuchi, T., Inoue, M., Konno, T., and Namita, Y. (1999). “Real-time hybrid experimental system with actuator delay compensation and its application to a piping system with energy absorber.” Earthquake Eng. Struct. Dyn., 28, 1121–1141.
Jung, R. -Y., Shing, P. B., Stauffer, E., and Thoen, B. (2007). “Performance of a real-time pseudodynamic test system considering nonlinear structural response.” Earthquake Eng. Struct. Dyn., 36, 1785–1809.
Kobayashi, H., and Tamura, K. (2000). “Experimental study on the validity of real-time hybrid vibration experiments with a 2-dimensional and 3-degrees-of-freedom model.” Proc., 12th World Conf. on Earthquake Engineering, New Zealand Society for Earthquake Engineering, Auckland, New Zealand, Paper No. 0965.
Kontopanos, A. (2006). “Experimental investigation of a prototype elastomeric structural damper.” MS thesis, Lehigh Univ., Bethlehem, Pa.
Mercan, O. (2007). “Analytical and experimental studies on large scale, real-time pseudodynamic testing.” Ph.D. dissertation, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, Pa.
Mercan, O., and Ricles, J. M. (2007). “Stability and accuracy analysis of outer loop dynamics in real-time pseudodynamic testing of SDOF systems.” Earthquake Eng. Struct. Dyn., 36, 1523–1543.
Mercan, O., and Ricles, J. M. (2008). “Stability analysis for real-time pseudodynamic and hybrid pseudodynamic testing with multiple sources of delay.” Earthquake Eng. Struct. Dyn., 37, 1269–1293.
Mosqueda, G., Stojadinovic, B., and Mahin, S. A. (2007). “Real-time error monitoring for hybrid simulation. Part I: Methodology and experimental verification.” J. Struct. Eng., 133(8), 1100–1108.
Nakashima, M., Kato, H., and Takaoka, E. (1992). “Development of real-time pseudodynamic testing.” Earthquake Eng. Struct. Dyn., 21, 79–92.
Nakashima, M., and Masaoka, N. (1999). “Real-time on-line test for MDOF systems.” Earthquake Eng. Struct. Dyn., 28, 393–420.
Oliveira, L. F., Simpson, D. M., and Nadal, J. (1996). “Calculation of area of stabilometric signals using principal component analysis.” Physiol. Meas, 17, 305–312.
Shing, P. B., Spacone, E., and Stauffer, E. (2002). “Conceptual design of fast hybrid test system at the university of Colorado.” Proc., 7th U.S. National Conf. on Earthquake Engineering, Boston, Mass.
Thewalt, C. R., and Roman, M. (1994). “Performance parameters for pseudodynamic tests.” J. Struct. Eng., 120(9), 2768–2781.
Wallace, M. I., Sieber, J., Nield, S. A., Wagg, D. J., and Krauskopf, B. (2005b). “Stability analysis of real-time dynamic substructuring using delay differential equations.” Earthquake Eng. Struct. Dyn., 34, 1817–1832.
Wallace, M. I., Wagg, D. J., and Neild, S. A. (2005a). “An adaptive polynomial based forward prediction algorithm for multi-actuator real-time dynamic substructuring.” Proc. R. Soc. London, Ser. A, 461, 3807–3826.
Wu, B., Xu, G., Wang, Q., and Williams, M. S. (2006). “Operator-splitting method for real-time substructure testing.” Earthquake Eng. Struct. Dyn., 35, 293–314.
Zhang, X. P., Ricles, J. M., Mercan, O., and Chen, C. C. (2005). “Servo-hydraulic system identification for the NEES real-time multi-directional earthquake simulation facility.” ATLSS Report No. 05-14, Center for Advanced Technology for Large Structural Systems, Lehigh Univ., Bethlehem, Pa.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 135 • Issue 9 • September 2009
Pages: 1124 - 1133
Copyright
© 2009 ASCE.
History
Received: Nov 1, 2007
Accepted: May 11, 2009
Published online: Aug 14, 2009
Published in print: Sep 2009
Notes
Note. Associate Editor: Panos Tsopelas
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