Resilient Bridges: Replaceable Structural Fuses for Post-Earthquake Accelerated Service, Phase I: Analytical Investigation June 2013

摘要

Research was conducted to investigate the possible implementation of Structural Fuses (SFs) in a typical California bridge for seismic applications. Several types of metallic hysteretic damping devices and connection details between the columns and fuses were considered. Buckling restrained Braces (BRBs) were found to provide the best SF solution. A design procedure was proposed for designing BRBs using the geometry and properties of typical California Bridge bent, but using concrete filled steel tube columns to facilitate connections with the fuses and help achieve the SF design objectives better. In all cases, the bridge columns yield displacement was chosen as the maximum (i.e. target) system displacement as part of the design procedure. The force-deformation relationships of the bridge bent with BRBs obtained from nonlinear pushover and time-history analyses matched the theoretical one used in the design procedure. Recommendations were provided for a next phase of study.