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Hybrid Simulation of Multi Story Structural Systems Through Collapse tested at nees@berkeley

NEES researcher and Stanford University Associate Professor Eduardo Miranda aims to create damage-free steel-framed buildings.

NEES@Berkeley's large actuators can push the specimen 10 inches back and forth.

The "enhanced gravity connections" are polymer-based springs.

In recent tests at the nees@berkeley lab, Stanford Associate Professor Eduardo Miranda and student Carlos Gordo Monson evaluated the performance of their new "Enhanced Gravity Connections" for use in steel buildings during a series of half scale beam column test that utilized hybrid simulation to predict collapse. Their "Enhanced Gravity Connections" use springs composed of polyurethane discs interleaved with steel plates to allow the gravity beam-column connections take on seismic load when the normal seismic elements begin to loose their capacity and the building drifts get large.

Collapse of buildings is one of the main sources of monetary losses and loss of human lives in a large earthquake. These tests are furthering understanding of hybrid simulation methods and collapse prediction, as well as evaluating the performance of the proposed new gravity connections and their potential to reduce the probability of collapse in steel structures. The project is making use of the nees@berkeley lab's actuators to apply large displacements to the specimens and its computers to simulate the mass of a real-world structure.

A filmed interview with the Stanford researchers has been overlaid with test footage from several of the moment connection tests, and is available on PEER's YouTube Channel.

These experimental research tests at nees@berkeley are part a project titled "Hybrid Simulation of Multi Story Structural Systems Through Collapse" funded by a NEES-R award.

More information about the project can be found at the nees@berkeley project web site: