Hybrid Simulation

Hybrid simulation combines physical testing and computer modeling, offering a more efficient and affordable way to examine how large civil structures respond to seismic loading. There are three common types, all of which apply loads to civil components or substructures.

Quasi-static hybrid simulation applies a recorded seismic event (time history) in a step-to-step displacement that runs approximately 20 times slower than actual duration. This allows detailed studies and is typically used to evaluate components that contribute stiffness and strength to the structure. Real-time hybrid simulation uses a one-to-one time scale in displacement, velocity or acceleration control, and is used to evaluate components that contribute damping or inertia effects. Fast hybrid simulation offers a third option. These tests run much faster than quasi-static but not close to real-time.

MTS has a long history of expertise in hybrid simulation. We cooperate with leading research teams at the University of Colorado at Boulder, University of California Berkeley, State University of New York at Buffalo and the National Center for Research on Earthquake Engineering (NCREE) in Taiwan. We offer complete solutions for hybrid simulation testing, and have installed more than 25 of these systems around the world. Important offerings include:

• High-force, dynamic structural actuators and large hydraulic power units for
   real-time hybrid simulation
• Heavy-duty, fatigue-rated hydraulic actuators designed for long stroke and low
   dynamic applications, which are ideal for quasi-static testing
• Digital controllers with high channel density, high capacity and superior configurability
• Advanced hybrid simulation software