2015 Three-Dimensional Shaking Table Test of a 10-Story Reinforced Concrete Building on the E-Defense, Part 3: Base Slip and Base Fixed Test Results

Abstract eng:
The E-Defense, which is the world’s largest three-dimensional (3D) full-scale earthquake shaking table test facility, was built by the National Research Institute for Earth Science and Disaster Resilience (NIED) with the aim of shedding light on the failure mechanisms of full-scale structures during earthquakes and for verifying the effects of seis mic retrofitting. Since its start of operations in April 2005, a wide variety of structures have been tested on this facility. In December 2015, NIED tested a 10-story reinforced concrete building frame on the E-Defense in order to gain building engineering knowledge that will facilitate continued use of damaged buildings after a major earthquake. In this experiment, data were obtained from a structure equipped with a base slip mechanism in order to examine the efficacy of the base slip method. After the base slip construction test, the base of the same specimen was fixed in place to simulate conventional construction conditions and testing was conducted in order to compare fixed-in-place behavior with the base slip response behavior, determine the damage process of each member, and examine damage and response evaluation methods. This paper discusses the results of the base slip and fixed base tests. In the base slip construction test, the base was observed slipping while base uplift occurred, which may have caused the base to slip with torsional movement. The maximum story drift angle generated in the specimen under 100% amplitude of the JMA-Kobe excitation was 0.0060 rad for the base slip construction test, which is relatively small compared to 0.0305 rad, which was measured during the fixed specimen foundation test. Additionally, for both tests, the story shear force generated at each floor is clearly larger when compared to the story shear force calculated during the specimen design for the same story drift angle. In the fixed base test, the beam and column main reinforcements that were arranged in cross-shaped joints yielded, and damage was concentrated at beam-column joints from the 3rd to 5th floors, where relatively large story drift angles were generated.

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