The SEESL lab is equipped with multiple large-scale, high-performance, dynamic and static actuators. These actuators provide the ability to conduct dynamic, pseudo-dynamic, and hybrid pseudo-dynamic testing, in which large structures could be directly subjected to dynamic excitations without the need for shake tables. Two large reaction walls are located on the eastern side of the lab, one of which is directly next to our shake tables. If equipped with dynamic actuators, this will allow for the application of computer-predicted external forces on shake table-mounted substructures, thus simulating the reaction of the entire structure (Real-Time Dynamic Hybrid Testing, or RTDHT).