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Bidirectional-Ductile End Diaphragms for Seismic Performance and Substructure Protection
The AASHTO Guide Specifications for LRFD Seismic Bridge Design (2011) include provisions for the design of steel bridges having specially detailed ductile diaphragms to resist loads applied in the bridge’s transverse direction. However, a major limitation of the existing provisions is that those ductile diaphragms have to be combined with other lateral-load resisting strategies to address seismic excitations acting along the bridge’s longitudinal axis. Furthermore, these design provisions for ductile diaphragms are only applicable to non-skew bridges and provide no guidance on how to bridge superstructuresductile diaphragms in skew bridges. A bi-directional ductile end diaphragm concept has been proposed here to implement ductile end diaphragms in straight or skew bridge superstructures. The proposed concept relies on easily replaceable hysteretic energy dissipating devices (structural fuses) arrayed such as to provide ductile response to horizontal bidirectional earthquake excitations. Buckling Restrained Braces (BRBs) are explored here as a possible solution to serve as the ductile diaphragm’s seismic fuses.
Bidirectional-Ductile End Diaphragms for Seismic Performance and Substructure Protection
The AASHTO Guide Specifications for LRFD Seismic Bridge Design (2011) include provisions for the design of steel bridges having specially detailed ductile diaphragms to resist loads applied in the bridge’s transverse direction. However, a major limitation of the existing provisions is that those ductile diaphragms have to be combined with other lateral-load resisting strategies to address seismic excitations acting along the bridge’s longitudinal axis. Furthermore, these design provisions for ductile diaphragms are only applicable to non-skew bridges and provide no guidance on how to bridge superstructuresductile diaphragms in skew bridges. A bi-directional ductile end diaphragm concept has been proposed here to implement ductile end diaphragms in straight or skew bridge superstructures. The proposed concept relies on easily replaceable hysteretic energy dissipating devices (structural fuses) arrayed such as to provide ductile response to horizontal bidirectional earthquake excitations. Buckling Restrained Braces (BRBs) are explored here as a possible solution to serve as the ductile diaphragm’s seismic fuses.
Bidirectional-Ductile End Diaphragms for Seismic Performance and Substructure Protection
X. Wei (Autor:in) / M. Bruneau (Autor:in)
2015
40 pages
Report
Keine Angabe
Englisch
Structural Analyses , Construction Management & Techniques , Civil, Construction, Structural, & Building Engineering , Transportation , Construction Equipment, Materials, & Supplies , Civil Engineering , Bidirectional-Ductile , Diaphragms(Engineering) , Seismic performance evaluation , Substructure Protection , Steel bridges , Buckling Restrained Braces (BRBs) , Bidirectional earthquake , Bridge superstructures , Implementation
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