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2010 E-Defense Four-Story Reinforced Concrete and Post-Tensioned Concrete Buildings - Comparative Study of Experimental and Analytical Results

By Zeynep Tuna1, Sofia Gavridou1, John Wallace1, Takuya Nagae2, Taizo Matsumori2

1. University of California, Los Angeles 2. National Research Institute for Earth Science and Disaster Prevention

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Abstract

2010 E-Defense Four-Story Reinforced Concrete and Post-Tensioned Concrete Buildings - Comparative Study of Experimental and Analytical Results

A series of shaking table tests were conducted on two, full-scale, four-story buildings on the NIED E-Defense shake table in December 2010. The buildings were almost identical in geometry and configuration; one building utilized a conventional reinforced concrete (RC) structural system with shear walls in one direction and moment frames in the other direction, whereas the other building utilized the same systems constructed with post-tensioned (PT) members. The buildings were simultaneously subjected to increasing intensity shaking using the JMA-Kobe record until a near-collapse state was reached to assess performance in both moderate-intensity frequent earthquakes (service-level) and large-intensity very rare earthquakes (collapse-level). A total of 609 channels of data were collected during the tests for RC and PT specimens, including accelerometers, displacement transducers, and strain gauges. The tests provided a wealth of data to assess and improve existing analytical tools used to model RC and PT components and systems.

The two buildings were designed using the newest code requirements and design recommendations available in both Japan and the US. The RC Building satisfied the ASCE/SEI 7-05 and ACI 318-08 requirements for Special RC Structural Walls and Special RC moment frames. The PT Building was designed using a performance-based seismic design methodology and included high performance, post-tensioned lateral force-resisting systems. The moment frames consisted of precast prestressed beam and column elements, while the structural walls utilized unbonded post-tensioned and mild steel to provide re-centering and energy dissipation characteristics. In addition, the PT Building incorporated high performance materials such as high-strength concrete with steel fibers and high-strength confinement reinforcement.

This paper focuses on the analytical modeling of the two buildings in the shear wall direction. Nonlinear response history analyses were conducted for the two buildings using CSI Perform3D and OpenSees in order to compare analytical and experimental results based on interstory drifts, floor accelerations, base rotations and shear deformations. The ability of the analytical models to predict the observed behavior was assessed at the service-level and collapse-level events. Although the analytical models captured global response parameters reasonably well at the service-level event, some inconsistencies between the simulated and measured responses were noted in the collapse-level event. Significant discrepancies can be related to several issues such as modeling of the strength degradation, influence of biaxial loading, and in-plane sliding shear at the base of the walls. Analytical studies are currently being carried out to address these critical issues.

Cite this work

Researchers should cite this work as follows:

  • Zeynep Tuna; Sofia Gavridou; John Wallace; Takuya Nagae; Taizo Matsumori (2014). "2010 E-Defense Four-Story Reinforced Concrete and Post-Tensioned Concrete Buildings - Comparative Study of Experimental and Analytical Results", Network for Earthquake Engineering Simulation (distributor), Paper, DOI:10.4231/D33X83M2P
  • Zeynep Tuna; Sofia Gavridou; John Wallace; Takuya Nagae; Taizo Matsumori (2014), "2010 E-Defense Four-Story Reinforced Concrete and Post-Tensioned Concrete Buildings - Comparative Study of Experimental and Analytical Results," http://nees.org/resources/11729.

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