EXPERIMENTAL AND ANALYTICAL STUDIES OF A FULL-SCALE POST-TENSIONED PRECAST RCS FRAME UNDER EARTHQUAKES

摘要

A series of cyclic tests of a full-scale one-story two-bay specimen frame, which was a substructure of a three-story post-tensioned (PT) self-centering building using reinforced concrete columns and steel beams, were tested in the Taiwan National Center for Research on Earthquake Engineering. The objectives of the tests were: (1) to obtain realistic data about the connection performance, progress of damage, and strength degradation of the frame, (2) to assess the hysteretic response of the frame subjected to various loading patterns, and (3) to examine the effects of column restraints on the frame elongation. This paper discusses the design, experimental results, and analytical simulations of the specimen frame. Timehistory analyses of the three-story PT building subjected to the design-based earthquake (DBE) and the maximum-considered earthquake (MCE) were conducted to investigate seismic demands of the proposed system. These tests confirmed the selfcentering response of the PT frame and explored failure of the beam compression toe, which was never observed in prior tests of beam-column subassemblages. The nonlinear structural analysis computer program could be used to simulate the hysteretic response well;inelastic time history analyses of the 3-story prototype building showed that the proposed frame system can reach seismic demands under MCE level ground motions.