Prof. Billington's research focuses on sustainable, durable construction materials and their application to structures and construction. Two current areas of focus are damage-tolerant, high-performance fiber-reinforced cementitious composite materials, and bio-based fiber-reinforced polymeric composites that have a closed loop life-cycle. Additional research in her group includes performance-based durability engineering, performance-based earthquake engineering assessment of self-centering bridge piers for seismic design, and advanced nonlinear simulation of structural concrete systems.