K11 - Feasibility study for damper between tower and bridge girder, phase I

Abstract

This note describes the phase 1 of a feasibility study for a damper between tower and bridge girder. For this alternative K11 concept it is proposed to replace the girder-tower connection in K11_07, by two passive viscous dampers between tower and bridge girder. The viscous dampers are placed below the cross section, to minimize the necessary broadening of the tower. The modified tower is designed with a bottom leg spacing of 54m in order to accommodate for the lateral displacement amplitude of approximately 1.7m. A free span back span length of 305m is selected in order to increase the flexibility of the girder at the tower position, based on parameter studies for different free-span back span lengths.