- Simplified Assessment of Railway Masonry Bridges Seismic Capacity
- G. Tecchio ; P. Zampieri ; F. da Porto ; C. Modena ; A. Prota ; G Manfredi
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: Masonry arch bridges ; seismic assessment ; Limit state analysis
- Description
- Masonry arch bridges represent the greatest portion of all the bridges in use in the Italian railway network. The
typological characteristics of these structures were identified on a large stock of 380 bridges located in high
seismicity areas, subdividing them into a set of homogeneous classes. Subsequently a parametrical analysis was performed for each class, in order to calculate the seismic capacity of
the bridges: appropriate ranges for geometrical and mechanical parameters, i.e. span length, arch thickness, spantorise ratio, pier height, etc. were considered, and the limit horizontal load multiplier was calculated for each
relevant collapse mechanism. Finally, envelope curves representing the seismic capacity expressed in terms of limit horizontal acceleration were derived, the input data of which are only easily detectable geometric parameters. These curves can be used for a simplified vulnerability assessment of railway masonry arch bridges, and for prioritizing further investigations and retrofit interventions.
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- Seismic Assessment of a 15-Story Building Damaged in the Chile Earthquake of February 27th 2010
- M. Kohrangi ; T.J. Sullivan ; G.M. Calvi
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: seismic assessment ; Chile earthquake
- Description
- This paper considers the seismic assessment of a 15-storey RC structural wall building, Alto Rio,
located in the city of Concepción that collapsed in the M8.8 Chile earthquake of Feb 27th 2010. Different methods of assessment, based on FEMA356, are applied to examine if the observed damage could have been anticipated. Results show that FEMA356 assessment methods would have identified that the building was likely to be damaged in a major earthquake. Severe irregularities and discontinuity of walls at the base of the structure, in general, and lack of ductile detailing in walls and coupling beams are identified as the likely reasons for the damage. In addition to this assessment, the design procedures that are expected to have been used for the original design of the building are reviewed. The results showed that in applying the code design procedure, wall axial tensile forces were probably underestimated and improved capacity design procedures should be implemented.
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- Seismic Performance Assessment of buildings_Vol.2
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- Book Title / Journal:
- Year: 2012 , Volume: 2 , Series: FEMA P-58-2
- Earthquake engineering
- Keywords: seismic assessment ; buildings
- Description
- This report provides guidance on implementing the seismic performance assessment methodology set forth in FEMA P-58-1, Seismic Performance
Assessment of Buildings, Volume 1 – Methodology, to assess the seismic performance of individual buildings based on their unique site, structural,
nonstructural, and occupancy characteristics, expressed in terms of the probability of incurring casualties, repair and replacement costs, repair time, and unsafe placarding. This Implementation Guide contains examples illustrating the performance assessment process, including selected
calculation and data generation procedures, as well user manuals for selected electronic materials provided in Volume 3 – Supporting Electronic Materials and Background Documentation.
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- Effects of Infilled Masonry Walls on Nonliner Structural Behavior of Precast Concrete Structures in Turkey
- K.A. Korkmaz ; F. Demir ; H. Tekeli ; A.E. Karahan
- Book Title / Journal: 14th World Conference on Earthquake Engineering
- Year: 2008 , Volume: , Series:
- Structure types ; Concrete structures ; Earthquake engineering
- Keywords: prefabricated buildings ; infill masonry walls ; seismic assessment ; hinge connections
- Description
- Turkey is one of earthquake prone country. 90% of its buildings is under earthquake risk. 1998 Adana and 1999 Marmara earthquakes caused high damages not only in high rise buildings but also in important industrial buildings too. In the recent earthquakes, large numbers of people have died or heavily injured in the complete collapse of buildings constructed with reinforced and precast concrete structures. In Turkey, most of the industrial buildings are prefabricated structures. In industial zones precast concrete structures are prefered
because of their economic and rapid production. It is a fact that a large part of the industrial regions are located on high risk earthquake zones. In the design of precast concrete structures, frames are generally analyzed in two dimensions. The infill masonry walls increase the stiffness and lateral capacity of the frame structures. Although, infill masonry walls increase these parameters, infill walls are generally not taken into consideration in the lateral load capacity of precast concrete structures. In the present study, in order to determine the effects of infill walls in earthquake behavior of single story hinged prefabricated industrial buildings in Turkey, the capacities of these buildings which were related with different parameters as concrete strength, column dimension, reinforcement ratio, soil class, story height and truss span, were determined. In the analyses, diagonal strut model is adopted for modeling masonry infill walls. Structural behaviors and load deformation relationship of precast concrete structures both with and without infilled walls are evaluated and compared.
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