Dynamic analysis of the action of the wind acting in a standardized tall building

Resumo

Buildings are increasingly tall and slender, which requires greater attention to ensure comfort and
safety for users. From a structural point of view, special attention should be paid to the dynamic effects caused
by the wind. Considering such effects in the design of a building, today, is facilitated by computational tools
that provide values of basic parameters such as amplitude and frequency. In this work, dynamic analysis was
performed through numerical simulation using the SAP2000 v.15 program for modeling the CAARC Standard
Tall Building. Different scenarios were considered, where the drag force calculated according to ABNT NBR
6123:1988 was applied. Such efforts were calculated for the 0
o
and 90o directions in relation to the building axes,
each being applied in two ways: on the building axis and with the eccentricity determined by rule to consider the
torsion effects on the building. The results regarding the top displacement, frequency and period were analyzed.
It was noted that the 90o

efforts applied off-axis resulted in the greatest displacements and frequency. From this
analysis it is demonstrated the importance of analyzing the dynamic effects in the considerations of eccentric
performance of the wind because, this can represent the most critical situation and, therefore, necessary for the
structural dimensioning of the building.