Maximum Story Drift Angle Response of Steel Frames having Different Strength and Stiffness in Two Orthogonal Structural Planes

Abstract

This research is concerned with the seismic response of the 3-dimensional frames. Analyses were carried out by using bidirectional ground motion transformed into the directions of strong and weak axes. The maximum story drift angle caused in an arbitrary direction when bidirectional ground motion was inputted along all the directions can be almost approximated by the maximum value among the responses when only the strong-axis ground motion was inputted along the direction of the structural plane and the responses when only the strong-axis ground motion was inputted along the direction where the strength of the frame is the maximum.