Studied in this paper is the inelastic seismic behavior and design of
asymmetric multistory buildings emphasizing, primarily, the use of sto
ry shear and torque histories. The following six different structural
characteristics and their effect on the torsional response of building
s are analyzed: strength of orthogonal resisting planes, stiffness asy
mmetry, strength asymmetry, planwise distribution of strength, number
of resisting planes, and intensity of the ground motion component in t
he orthogonal direction. As a result of these analyses several techniq
ues and conceptual guidelines are developed to correct the planwise un
balance in deformation demands typical of asymmetric structures. The t
wo most important are to increase the torsional capacity of the system
by introducing resisting planes in the orthogonal direction, and to m
odify the stiffness and strength distribution to localize yielding in
selected resisting planes. Using these guidelines the undesirable eart
hquake response of a very asymmetrical building is effectively correct
ed by changing slightly the strength of a few key resisting planes. Fi
nally, it is concluded that the use of the story shear and response hi
stories in conjunction with the corresponding story yield surfaces is
a powerful tool for conceptual understanding of the earthquake behavio
r of asymmetric structures.