Patent ID: 6425157
Filing Date: 2002-07-30
Classification: E01D,E04H

Abstract:
A method of designing an elevated bridge infrastructure including a reinforced concrete rigid frame and a damper-brace disposed in a structural plane, said method comprising:setting a target ductility factor &mgr;d and a target natural period Td for the infrastructure in an assumed earthquake motion; obtaining a yield seismic coefficient corresponding to the target ductility factor &mgr;d and the target natural period Td from a yield seismic coefficient spectrum corresponding to the assumed earthquake motion to provide a design seismic coefficient Kh, and obtaining a target yield rigidity Kd corresponding to the target natural period Td; using the design seismic coefficient Kh to obtain a design horizontal load bearing capacity Hd, and obtaining a displacement corresponding to the design horizontal load bearing capacity Hd as a design yield displacement &dgr;d from the target yield rigidity Kd, distributing the design horizontal load bearing capacity Hd to a horizontal force Hf to be borne by the reinforced concrete rigid frame and a horizontal force Hb to be borne by the damper-brace; and setting member sections of the reinforced concrete rigid frame and the damper-brace so that the reinforced concrete rigid frame and the damper-brace are to resist the horizontal forces Hf, Hb with an ultimate load bearing capacity, and displacements corresponding to the horizontal forces Hf, Hb equal a product of the design yield displacement &dgr;d and the target ductility factor &mgr;d.