Seismic Vulnerability Assessment of Low-Rise Reinforced Concrete Buildings Affected by the 2015 Gorkha, Nepal, Earthquake

2017 ◽  
Vol 33 (1_suppl) ◽  
pp. 275-298 ◽  
Author(s):  
Svetlana Brzev ◽  
Bishnu Pandey ◽  
Dev Kumar Maharjan ◽  
Carlos Ventura
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Rc Buildings ◽  
Seismic Vulnerability Assessment ◽  
Wall Area ◽  
Rc Frames ◽  
Wall Structures ◽  
2015 Gorkha Earthquake ◽  
Observed Damage ◽  
Masonry Shear Wall

Low-rise reinforced concrete (RC) frames with brick masonry infill walls up to five stories high have been used for housing construction in Nepal since the late 1980s. Many buildings of this type were damaged and/or collapsed in the 25 April 2015 Gorkha earthquake (M 7.8), even in areas characterized with moderate shaking intensity such as Kathmandu Valley. Due to inadequate design and/or construction of RC frame components, these buildings essentially behave like masonry shear wall structures with a shear-dominant failure mechanism. The paper presents the findings of a field survey of 98 RC buildings affected by the 2015 earthquake. The main objective of the study was to correlate the observed damage in the buildings using the modified European macroseismic scale (EMS)-98 and the wall index (defined as the wall area in the direction of shaking divided by the total building plan area above the level of interest). The results can be used to help establish recommendations regarding the required wall index for low-rise RC buildings in Nepal.

Seismic Vulnerability Assessment of Multi Span Reinforced Concrete Bridges in Republic of Macedonia

2019 ◽  
Author(s):  
Marija Vitanova ◽  
Viktor Hristovski ◽  
Elena Dumova Jovanovska
Keyword(s):  
Reinforced Concrete ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Concrete Bridges ◽  
Seismic Vulnerability Assessment ◽  
Republic Of Macedonia ◽  
Reinforced Concrete Bridges

<p>Being located in the central part of the Balkans, Republic of Macedonia has an economically strategic position for the region. Conditions of bridges are therefore significant in assessment of the entire seismic risk for the regional transportation network. This paper deals with vulnerability of road bridges typical for the Republic of Macedonia by use of an expanded multiple stripe analysis method approach. Typical bridges were selected based on an inventory study, which included statistical analyses of in situ collected data on all vital structures along the main roads and highways in the territory of the Republic of Macedonia. The results from the performed statistical analysis showed that most of these bridges represented reinforced concrete bridges with main girders. To define the vulnerability of these bridges, representative examples of variable geometrical characteristics were selected. Their values were adopted in combination with the values obtained from the statistical analysis. Vulnerability curves were obtained analytically by nonlinear dynamic analyses and use of different sets of ground motions scaled to different intensity levels. PGA was used as a measure of intensity. Based on nonlinear behaviour of the bridges and development of displacements in the bearings, four damage levels were defined. The soil-structure interaction was also taken into account in the analysis of the representative bridges. The seismic response of the typical reinforced concrete girder bridges was at an acceptable level.</p>

Measures of the Seismic Vulnerability of Reinforced Concrete Buildings in Haiti

2011 ◽  
Vol 27 (1_suppl1) ◽  
pp. 373-386 ◽  
Author(s):  
Patrick O'Brien ◽  
Marc Eberhard ◽  
Olafur Haraldsson ◽  
Ayhan Irfanoglu ◽  
David Lattanzi ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
The United States ◽  
Faculty Members ◽  
Rc Buildings ◽  
Screening Process ◽  
Cross Sectional ◽  
Screening Criteria ◽  
Survey Results ◽  
Similar Survey

Following the 12 January 2010 Haiti earthquake, teams of students and faculty members from the United States and Haiti surveyed 170 reinforced concrete (RC) buildings in Port-au-Prince and Léogâne. This paper summarizes the survey results and compares them with results from a similar survey done after the 1999 earthquakes near Düzce, Turkey. The survey results demonstrate that the frequency of damage in RC buildings was higher in Haiti than in Turkey. This increased level of damage is consistent with practical screening criteria based on cross-sectional areas of building columns and walls. Based on these criteria, 90% of the structures surveyed in Haiti would have been classified as seismically vulnerable before the earthquake. Damage was more frequent in structures with captive columns. A two-tiered screening process is suggested to rapidly assess the vulnerability of scores of poorly built low-rise RC buildings in future earthquakes.

Response of Mid-Rise Reinforced Concrete Frame Buildings to the 2017 Puebla Earthquake

2019 ◽  
Vol 35 (4) ◽  
pp. 1763-1793 ◽  
Author(s):  
Carlos A. Arteta ◽  
Julian Carrillo ◽  
Jorge Archbold ◽  
Daniel Gaspar ◽  
Cesar Pajaro ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
The United States ◽  
Rc Buildings ◽  
Reinforced Concrete Frame ◽  
Infill Walls ◽  
Concrete Frame ◽  
Soft Story ◽  
Masonry Infills ◽  
Rc Frames ◽  
Ductility Capacity

The response of mid-rise reinforced concrete (RC) buildings in Mexico City after the 2017 Puebla Earthquake is assessed through combined field and computational investigation. The Mw 7.1 earthquake damaged more than 500 buildings where most of them are classified as mid-rise RC frames with infill walls. A multinational team from Colombia, Mexico, and the United States was rapidly deployed within a week of the occurrence of the event to investigate the structural and nonstructural damage levels of over 60 RC buildings with 2–12 stories. The results of the study confirmed that older mid-rise structures with limited ductility capacity may have been shaken past their capacity. To elucidate the widespread damage in mid-rise RC framed structures, the post-earthquake reconnaissance effort is complemented with inelastic modeling and simulation of several representative RC framing systems with and without masonry infill walls. It was confirmed that the addition of non-isolated masonry infills significantly impacts the ductility capacity and increases the potential for a soft-story mechanism formation in RC frames originally analyzed and designed to be bare systems.

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