Nonlinear dynamic analysis of high-strength concrete Bridge under post-fire earthquakes considering hydrodynamic effects

Abstract

A host of investigations on the fire resistance of concrete structures after-earthquakes and the fire resistance of concrete structures. This study utilized the linear interpolation method to deduce the curve relationship of elastic modulus and stress with temperature of high-strength concrete C60, and then the nonlinear dynamic analysis of high-strength concrete bridge structures under post-fire earthquake action is evaluated. The nonlinear dynamic response laws of high-strength concrete total bridge structures under different water depths are evaluated. The seismic capacity of high-strength concrete bridge structures under the influence of hydrodynamic effects and temperature effects is comparatively evaluated, and the results show that the hydrodynamic effect provides the external force, the temperature effect changes the concrete material properties, and the combined effect of the temperature effect and the hydrodynamic effect is significant than the effect independent of the temperature effect and the hydrodynamic effect. It is complicated and significantly increases the displacement and stress response of the bridge. The combined effects of the hydrodynamic effect and the temperature effect cannot merely be characterised as a linear superposition of the two single actions. The temperature effect on the structure is more significant than the hydrodynamic effect.