During the recent construction activity in China, concrete filled steel tubes (CFST) typology is innovatively applied in beam bridges with CFST composite truss girders and CFST lattice piers. The subject is Ganhaizi Bridge, one of the most unusual viaducts, has a total length of 1811m and is an experimental truss bridge that uses steel tubes for nearly the entire structure. This paper presents the study on nonlinear seismic performance of Ganhaizi Bridge. Seismic response characteristics, piers yielding order and internal force redistribution effect in plastic scope are investigated through a simplified fiber finite element model based on the second unit of this bridge. Take extreme edge strain of CFST columns as criterion, the horizontal most adverse seismic input direction for this curved bridge is perpendicular to the bearing connection on both ends, the influence of vertical ground motion should be simultaneously considered. After turn into plastic stage with increasing peak ground acceleration (PGA), the main stress direction of lattice piers and composite piers are both in plane, axial forces increase less than seismic, while displacements increase greater. Bending moments of high piers increase greater than short piers, which is expected to facilitate seismic performance of the whole bridge.

Seismic analysis of a concrete filled steel tubular truss bridge / Briseghella, Bruno. - In: REPORT. - ISSN 2221-3783. - 102:(2014), pp. 364-371. ((Intervento presentato al convegno 37th IABSE Symposium on Engineering for Progress, Nature and People tenutosi a esp nel 2014 [10.2749/222137814814027873].

Seismic analysis of a concrete filled steel tubular truss bridge

briseghella
2014-01-01

Abstract

During the recent construction activity in China, concrete filled steel tubes (CFST) typology is innovatively applied in beam bridges with CFST composite truss girders and CFST lattice piers. The subject is Ganhaizi Bridge, one of the most unusual viaducts, has a total length of 1811m and is an experimental truss bridge that uses steel tubes for nearly the entire structure. This paper presents the study on nonlinear seismic performance of Ganhaizi Bridge. Seismic response characteristics, piers yielding order and internal force redistribution effect in plastic scope are investigated through a simplified fiber finite element model based on the second unit of this bridge. Take extreme edge strain of CFST columns as criterion, the horizontal most adverse seismic input direction for this curved bridge is perpendicular to the bearing connection on both ends, the influence of vertical ground motion should be simultaneously considered. After turn into plastic stage with increasing peak ground acceleration (PGA), the main stress direction of lattice piers and composite piers are both in plane, axial forces increase less than seismic, while displacements increase greater. Bending moments of high piers increase greater than short piers, which is expected to facilitate seismic performance of the whole bridge.
37th IABSE Symposium on Engineering for Progress, Nature and People
esp
2014
102
364
371
Briseghella, Bruno
Seismic analysis of a concrete filled steel tubular truss bridge / Briseghella, Bruno. - In: REPORT. - ISSN 2221-3783. - 102:(2014), pp. 364-371. ((Intervento presentato al convegno 37th IABSE Symposium on Engineering for Progress, Nature and People tenutosi a esp nel 2014 [10.2749/222137814814027873].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1287395
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