Behaviour of structures under extreme load events (e.g., earthquake, windstorm, and blast)
Real-time hybrid (pseudo-dynamic) simulation
Structural dynamics and control
Nonlinear structural analysis
Numerical techniques
Soil-structure interaction
Contributed the following developments to OpenSees (Open System for Earthquake Engineering Simulation), an open source software framework, enabling large-scale numerical simulation and hybrid simulation (pseudo-dynamic test) of civil infrastructure systems under dynamic excitations:
(a) New families of explicit unconditionally stable parametrically dissipative direct integration algorithms, namely the Kolay–Ricles–α (KR–α) and modified KR–α methods
(b) An improved Giuffre–Menegotto–Pinto model for modelling hysteretic response of structural and reinforcing steel materials (https://github.com/Kolay-IITK/Steel02M)
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.