Influence of span-length on seismic vulnerability of reinforced concrete buildings based on their fragility curves

2016 ◽  
pp. 289-293 ◽  
Author(s):  
M Cripstyani ◽  
S Kristiawan ◽  
E Purwanto
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Span Length ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings

scholarly journals Seismic Vulnerability and Risk of Losses Case Study Center of the City of Azogues

2021 ◽  
Vol 1203 (3) ◽  
pp. 032124
Author(s):  
Carlos Julio Calle Castro ◽  
Juan Sebastián Maldonado Noboa ◽  
Luis Mario Almache Sánchez
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Seismic Vulnerability ◽  
Fragility Curves ◽  
Inelastic Behavior ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings ◽  
Capacity Curves ◽  
Performance Point ◽  
The City

Abstract Ecuador is located in the Pacific Ring of Fire, a country with high risk and seismic sensitivity, evidenced by the 6.8-degree earthquake in Ambato in 1949, which left approximately 6000 dead, the 7.8-degree earthquake in Manabí and Esmeraldas in the year 2016 with 663 victims and 29672 buildings without the possibility of use. Currently there is a problem about seismic performance in reinforced concrete buildings, since many were built with old regulations; so, it is necessary to assess their vulnerability. Quito, Guayaquil and Cuenca, large cities in Ecuador, have formal studies of seismic vulnerability, mostly carried out by university students and teachers. In contrast, most small cities do not have these studies; or, they need to be updated to validate their results. This is the case of the city of Azogues. The objective of this research is to evaluate the vulnerability of structures using the Hazus methodology, adapted to Ecuador, in the downtown area of the city of Azogues, in structures located around the Central Park, to establish the seismic performance in reinforced concrete buildings. The Hazus methodology, which determines the vulnerability of buildings from fragility curves, which are entered with inputs as the capacity, performance level and drift curves calculated through Ecuadorian models. The capacity curves, depending on various aspects such as: the material, number of floors, spans between columns, among others; they vary from building to building. In this sense, capacity curves were defined for sets of buildings with similar characteristics, coinciding with the Hazus methodology. The performance levels and the displacements were calculated with the ETABS computer package. For fragility curves, the model that most real simulates the response of a structure is the non-linear analysis, because it considers the decrease in stiffness in columns and beams, as well as the deterioration of the properties of the materials. In this sense, there are fragility curves of Ecuadorian buildings for four levels. The earthquake readings enable the construction of a demand spectrum, which, when contrasted with the capacity spectrum, leads to the performance point. Its position sometimes varies per the elastic demand spectrum, which is diminished by its inelastic behavior. As the demand spectrum decreases, the damage will increase. Once the coordinates of the performance point are known, the fragility curves are used; and, the possible damages are defined, quantifying them in percentage.

Seismic vulnerability and retrofitting scheme for low-to-medium rise reinforced concrete buildings in Nepal

2019 ◽  
Vol 21 ◽  
pp. 186-199 ◽  
Author(s):  
Ashim Adhikari ◽  
K. Rama Mohan Rao ◽  
Dipendra Gautam ◽  
Hemchandra Chaulagain
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Reinforced Concrete Buildings ◽  
Concrete Buildings

Evaluation of Seismic Vulnerability Indices for Low-Rise Reinforced Concrete Buildings Including Data from the 6 February 2016 Taiwan Earthquake

2020 ◽  
Vol 15 (1) ◽  
pp. 9-19
Author(s):  
Santiago Pujol ◽  
Lucas Laughery ◽  
Aishwarya Puranam ◽  
Pedram Hesam ◽  
Li-Hui Cheng ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Vulnerability Index ◽  
Exact Form ◽  
Reinforced Concrete Buildings ◽  
Severe Damage ◽  
Concrete Buildings ◽  
Damage And Failure ◽  
Taiwan Earthquake

Communities need seismic vulnerability indices to identify which buildings are most susceptible to severe damage during earthquakes. To be of greatest value, these indices should be easy to use and should be vetted against data from previous earthquakes. To date, more than 800 reinforced concrete buildings have been surveyed after earthquakes for the purpose of evaluating a seismic vulnerability index proposed by Hassan and Sozen in 1997. This number includes 130 buildings surveyed after the 6 February 2016 earthquake in Taiwan. The data collected during these surveys consist of descriptions and photographs of damage, structural sketches, and measurements. Analyses of the data indicate that probability of severe damage and failure increases with decreasing column index and wall index (normalized measures of column and wall areas). They also suggest that the exact form of the threshold used to distinguish more vulnerable structures from less vulnerable structures is of little consequence in terms of the probable cost and benefits of the strengthening program this threshold may inform.

BASE ISOLATION IN SEISMIC RETROFITTING OF R/C BUILDINGS

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Alberto Dusi ◽  
Marco Mezzi ◽  
Tan Teng Or
Keyword(s):  
Reinforced Concrete ◽  
Seismic Vulnerability ◽  
Base Isolation ◽  
Human Life ◽  
Lessons Learned ◽  
Seismic Retrofitting ◽  
Reinforced Concrete Buildings ◽  
Building Vulnerability ◽  
Concrete Buildings ◽  
2009 L’Aquila Earthquake

The paper, based on the authors’ direct involvement in managing actual retrofitting design, reports on seismic vulnerability assessment, design and implementation issues related to the seismic retrofit of reinforced concrete buildings through base isolation. The retrofitting interventions design of damaged buildings involves three aspects: the damage survey, the assessment of the vulnerability of building in its original structural configuration, the design of intervention needed to reduce the building vulnerability up to a conventional level, normally indicated by the seismic standards. In the first part of the paper, the experience achieved in the retrofit of reinforced concrete buildings damaged by the Italian 2009 L’Aquila earthquake is presented by referring to a typical intervention designed by the authors. Topics related to conventional vs base isolation retrofitting strategies, structure’s performance, safeguard of human life, construction efficiency and repairing cost are analyzed with reference to actual case study. Lessons learned from the Italian experience have been critically applied to the design of retrofit intervention of a building, designed according to the current Nepal set of codes and under completion at the time of the earthquake, damaged by the Gorkha 2015 earthquake. In the second part of the paper activities carried out for the definition of a specific site seismic input, for the dynamic characterization of the building and for the design of the base isolation retrofit are presented.

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