Contributed new families of explicit unconditionally stable parametrically dissipative direct integration algorithms, including the Kolay-Ricles-alpha (KR-alpha) and modified KR-alpha methods, to the open source software framework of OpenSees (Open System for Earthquake Engineering Simulation) for the engineering community to use in large-scale numerical simulation and hybrid simulation (pseudo-dynamic test) of civil infrastructure systems under dynamic excitations.
Implemented an efficient state-determination procedure for force-based nonlinear beam-column elements in the software framework of the NHERI Lehigh RTMD EF for the natural hazards research community to use in real-time hybrid simulation of frame structures.