Quasi-Static Axial Damping of Poroviscoelastic Cylinders

Abstract

Design of infrastructure materials with inherent material damping may help dissipate energy during dynamic loading events such as earthquakes, thereby reducing structural damage and risk of collapse. One possible method to enhance damping of cementitious materials such as concrete is to utilize poromechanical damping. To evaluate the potential damping associated with the poromechanical effect and to aid in the design of high damping porous materials such as concrete, approximate closed-form solutions have been derived for poromechanical damping as a function of frequency, maximum damping, and critical damping frequency for axially loaded solid and hollow cylinders. The effect of inherent viscoelastic damping of the porous material body was included in the analysis, which indicated that inherent viscoelastic damping could be superposed on poromechanical damping to predict overall damping capacity. Simulations indicate that poromechanical damping may be significant for cementitious materials if designed appropriately.