Seismic Behaviour: Over-resistance Effects On
Buildings
Author(s)
J. A. Avila
Abstract
The damage levels observed in the field, due to the 1985 earthquakes, is
compared in a building in Mexico City with the analytical predicted behavior
with, and without, the available over-resistance effects. The results were
compared to those obtained from the conventional seismic analysis and to the
observed damage behavior after the earthquake. Even the structures behaviour,
located in soft soil in Mexico City, are qualified as adequate; there were some
problems in some buildings, especially those between 7 to 17 levels. The
structures behavior shows that these count with a certain over-resistance range
that has been indirectly included and that was possibly the reason that a great
number of buildings have not collapsed, even though they suffered severe
damage. Elastic and inelastic time-history analyses are made. The soil-structure
interaction and the P-∆ effects are included in the analysis. The analytical
periods are compared to those experimentally obtained. A very good congruency
between the analytically predicted behavior and the observed damage level after
the earthquake is obtained. The direction and the stories with maximum damage
match with the direction and stories with maximum deformations obtained from
the analysis. The structural element resistances determined in a nominal way
result were quite low compared to their real average values. It is noticed that the
structure has a superior lateral resistance capacity compared to that given in the
conventional design.
1 Introduction
Even the behavior of structures located in the soft zone in Mexico City, and
subject to the 1985 earthquakes, are qualified as satisfactory; there were some
Keywords
Related Book
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