Nonlinear dynamics of self-centring segmental composite rocking column

This paper explores the feasibility of an innovative, damage-free, self-centring segmental bridge pier. The idea for the system is inspired by the mechanical interaction of the intervertebral bones and discs that form a human spine. The mechanical properties of the annulus fibrosis within the discs are effective in responding to the extreme cyclic loadings imposed upon the human body. Tests were undertaken to determine whether a similar structure could dissipate the extra seismic energy in an equally efficient manner. Early stage experimentation was performed on small scale models consisting of wooden blocks with rubber strips between the segments acting as the intervertebral discs. The response of the proposed system under dynamic load is studied by developing shaking table testing. The nonlinear dynamics and mechanics of the system were explored to ascertain its behaviour under dynamic excitation. It was found that the integration of rubber pads into the segmental timber structure increased the energy dissipation capability of the structure. Moreover, the experimental results show that the proposed model eliminated any permanent structural damage and residual displacement in the system.