The stress-related material damping of rigid frame bridge with corrugated steel webs

The inelastic behavior of the materials leads to the energy dissipation. The amplitude of the stress is the main affect factor for the energy dissipation capacity of solid materials such as metal and concrete. Based on the loss energy per unit volume of the metal material and reinforced concrete material, the stress-related material damping of the steel concrete composite structure are calculated. Combined with the finite element methods, an iterative algorithm is proposed to calculate the material damping of the rigid frame bridge with corrugated steel webs. Based on a model of rigid frame bridge with corrugated steel webs and the equivalent concrete web bridges, the material damping of the structure under different seismic intensity are calculated and compared. The analysis and comparison show that the stress-related material damping increased with the seismic intensity. Different damping ratios should be considered under different seismic intensities for the seismic response analysis of the bridge.