In the present paper, the seismic performance of existing masonry arch bridges is evaluated making use of the nonlinear static analysis, as suggested by several modern standards like UNI ENV 1998-1 2003, OPCM 3274 2004, FEMA 440 2005. The methodology, based on inelastic pushover analysis and response spectrum approach becomes more difficult when structures different than the framed ones are investigated. This paper goes deeply into the application to masonry arch bridges, by presenting two particular case of study. The need of experimental tests to calibrate the materials and the dynamic properties is highlighted, in order to model correctly the most critical regions of the structure. Afterwards, the choice of the control node in the pushover analysis of masonry arch bridges and its influence on the seismic safety evaluation is investigated. The presented discussion emphasizes very important results, like the unsuitability of the usually-considered top node of the structure to describe the bridge seismic capacity. Finally, the seismic safety of the two considered bridges is verified by presenting an in deep vulnerability analysis.
L. Pelà, A. Aprile, A. Benedetti (2009). Seismic assessment of masonry arch bridges. ENGINEERING STRUCTURES, 31, 1777-1788 [10.1016/j.engstruct.2009.02.012].
Seismic assessment of masonry arch bridges
BENEDETTI, ANDREA
2009
Abstract
In the present paper, the seismic performance of existing masonry arch bridges is evaluated making use of the nonlinear static analysis, as suggested by several modern standards like UNI ENV 1998-1 2003, OPCM 3274 2004, FEMA 440 2005. The methodology, based on inelastic pushover analysis and response spectrum approach becomes more difficult when structures different than the framed ones are investigated. This paper goes deeply into the application to masonry arch bridges, by presenting two particular case of study. The need of experimental tests to calibrate the materials and the dynamic properties is highlighted, in order to model correctly the most critical regions of the structure. Afterwards, the choice of the control node in the pushover analysis of masonry arch bridges and its influence on the seismic safety evaluation is investigated. The presented discussion emphasizes very important results, like the unsuitability of the usually-considered top node of the structure to describe the bridge seismic capacity. Finally, the seismic safety of the two considered bridges is verified by presenting an in deep vulnerability analysis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
