Analysis of Adaptive Pushover in Confined Masonry Dwellings with Height Irregularity in the Lima Metropolitan Area

Diaz M.; Zavala C.; Lopez L.; Amancio M. · Journal of Disaster Research (2023) · DOI: 10.20965/jdr.2023.p0350

Resumen

Non-engineered confined masonry dwellings are char-acterized by having different masonry units. One of the most common cases in the Lima Metropolitan Area is that this type of dwelling has its first floors with handmade solid units and upper floors are composed of industrial horizontal hollowed (tubular) bricks. Nonlinear static analysis by the incrementally increasing loading pattern is inadequate to estimating earthquake response of structures with height irregularity, such as non-engineered confined masonry dwellings, because the loading pattern changes during the history of reversal loads due to damaging earthquakes. This paper presents the effect of nonlinear static analysis using adaptive loading patterns in confined masonry dwellings when the type of masonry units changes drastically. Nonlinear static analyses are applied using non-adaptive and adaptive displacement-based pushover procedures. A series of nonlinear time history analyses are also conducted to measure the error in the estimation of the seismic response. The adaptive loading pattern is based on displacement approxima-tion by the modal analysis at each step of incremental-increasing loads. The load pattern is updated consid-ering the modal analysis of an equivalent linear model using the equivalent stiffness of the structure at the se-cant of the maximum previous response. The applica-tion of the adaptive loading pattern in nonlinear static analysis significantly approximates the earthquake response of confined masonry dwellings with height irregularity provided by the change of masonry bricks. © Fuji Technology Press Ltd.

Instituciones: Universidad Nacional de Ingeniería