Seismic tests of post-tensioned self-centering building frames with column and slab restraints

2011, Volume 5, Issue 3

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Frontiers of Structural and Civil Engineering >> 2011, Volume 5, Issue 3 doi: 10.1007/s11709-011-0119-5

Seismic tests of post-tensioned self-centering building frames with column and slab restraints

1. Department of Civil Engineering, Taiwan University, Taipei, China; 2. Federal Engineering Consultant Inc., Taipei, China

Available online: 2011-09-05

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Abstract

Post-tensioned (PT) self-centering moment frames have been developed as an alternative to typical moment-resisting frames (MRFs) for earthquake resistance. When a PT frame deforms laterally, gaps between the beams and columns open. However, the gaps are constrained by the columns and the slab in a real PT self-centering building frame. This paper presents a methodology for evaluating the column restraint and beam compression force based on the column deformation and gap openings at all stories. The method is verified by cyclic tests of a full-scale, two-bay by one-story PT frame. Moreover, a sliding slab is proposed to minimize restraints on the expansion of the PT frame. Shaking table tests were conducted on a reduced-scale, two-by-two bay one-story specimen, which comprises one PT frame and two gravitational frames. The PT frame and gravitational frames are self-centering throughout the tests, responding in phase with only minor differences in peak drifts caused by expansion of the PT frame. When the specimen is excited by a simulation of the 1999 Chi-Chi earthquake with a peak ground acceleration of 1.87 g, the maximum interstory drift and the residual drift are 7.2% and 0.01%, respectively.

Keywords

post-tensioned frame ; frame expansion ; column restraint ; sliding slab ; frame test ; shake table test

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