A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Design and application of energy-dissipating dampers on a new concrete bridge in California
Passive energy dissipation systems have long been used in industrial, military and aerospace applications but only more recently in bridges. This paper will review the first use of dampers on a new concrete bridge in the United States. Dampers were incorporated into the design of a pair of 1270-foot long bridges to absorb energy induced by earthquakes and reduce seismic movements. The two-level seismic design criteria required consideration of seismic movements in sizing the joints and backwall gaps. The intent of the criteria is to maintain toll road traffic following the lower level earthquake by preventing damage to the abutments and joint seal assemblies. Each bridge was fitted with three 160-kip, 0.4 exponent, nonlinear fluid viscous dampers. The units reduce the lower level longitudinal seismic movement by approximately forty-five percent allowing the use of smaller joint seals. Because nonlinear devices were used, the structures will also see significant reductions in upper level forces and displacements as well. The design principles, applicable design codes, analysis requirements, detailing and design specifications are discussed. The benefits and potential cost savings of dampers are also reviewed.
Design and application of energy-dissipating dampers on a new concrete bridge in California
Passive energy dissipation systems have long been used in industrial, military and aerospace applications but only more recently in bridges. This paper will review the first use of dampers on a new concrete bridge in the United States. Dampers were incorporated into the design of a pair of 1270-foot long bridges to absorb energy induced by earthquakes and reduce seismic movements. The two-level seismic design criteria required consideration of seismic movements in sizing the joints and backwall gaps. The intent of the criteria is to maintain toll road traffic following the lower level earthquake by preventing damage to the abutments and joint seal assemblies. Each bridge was fitted with three 160-kip, 0.4 exponent, nonlinear fluid viscous dampers. The units reduce the lower level longitudinal seismic movement by approximately forty-five percent allowing the use of smaller joint seals. Because nonlinear devices were used, the structures will also see significant reductions in upper level forces and displacements as well. The design principles, applicable design codes, analysis requirements, detailing and design specifications are discussed. The benefits and potential cost savings of dampers are also reviewed.
Design and application of energy-dissipating dampers on a new concrete bridge in California
Strandgaard, H. (author)
2000
12 Seiten, 12 Quellen
Conference paper
English
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