Upgrading seismically isolated bridges with space-flange energy dissipation devices. Issue 7 (19th July 2019) - Misini, Misin
Abstract : Non-linear three-dimensional analytical models of bridges with laminated-rubber seismic bearing devices upgraded with multi-directional space-flange energy-dissipation devices were experimentally validated under multi-directional seismic action by shaking table tests of large-scale prototypes. Experimentally verified hysteretic models were used to model the upgraded seismic isolation system. The seismic protection benefits of the upgraded isolation system were demonstrated through a comparative analysis of bridge prototypes with both standard and upgraded systems. It was confirmed that the space-flange devices provided a qualitative contribution under very strong earthquakes in all directions. The variation of the structural characteristics of the devices illustrates the technological options for qualitative seismic upgrading of various types of isolated bridges with complex plane geometries under multi-directional seismic actions.