Development of Fragility Curves for Self-Built Confined Masonry Dwellings in the Metropolitan Area of Lima, Peru


Abstract eng:
The informal building’s construction is associated to Lima’s population growth, especially at the sub-urban areas. In Peru, confined masonry is the most common structural system used for buildings. It is fair to state that these buildings may have a poor structural performance during an earthquake of medium or high intensity. Therefore, it is important to know their structural behavior. Fragility curves must be calculated in order to know the probability of exceeding a certain limit state due to a given ground motion and are obtained through the comparison between the structural capacity and the seismic demand. In this study the structural capacity of each masonry building is represented by a simplified capacity curve. For that, the Simplified Pushover-based Earthquake Loss Assessment (SP-BELA) methodology has been adapted to assess capacity curves for confined masonry buildings. Some field data gathered by previous studies at the PUCP was used to generate a database which contains statistical information about structural characteristics of the buildings. Then, a random population of buildings is generated using Montecarlo simulation and capacity curves are computed. The seismic demand is represented by a set of ground motion records. Subduction records are selected from the database of the Pacific Earthquake Engineering Research Center in order to satisfy the seismological characteristics of Lima. The set of records is applied to each SDOF in order to calculate the displacement demand. From the comparison between the displacement demand and the displacement capacity, the probability damage matrix is calculated, and then the cumulative matrix. This last expresses the probability of exceedance of a given damage limit state for a given intensity level (fragility curves), which could help to compute vulnerability curves. The results show the necessity to improve the seismic capacity of confined masonry buildings in Lima, this considering the 10% probability of exceedance in 50 years (a return period of 475 years), between 12% and 57% of collapses is expected in cases of 1-story and 2-story buildings, respectively.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



Record appears in:



 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4058.:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)