Study of X-Braced Steel Frame Structures Under Earthquake Simulation

摘要

This report presents experimental shaking table test results on the seismic performance of a model three-story building frame, both unbraced and with three different wind bracing systems; and correlates these results with analytical predictions. Considerable compression buckling and tension yielding of the diagonal bracing members were observed in the tests, but the bracing provided significant reductions in the lateral displacements when compared with the unbraced frame response. Analytical techniques employing three different hysteresis models to represent the three types of bracing systems are shown to predict the response of braced frames with excellent accuracy. Analytical response predictions for the unbraced frame, employing concentrated bilinear plastic hinges for all members including joint connections, also are shown to be very accurate for the levels of nonlinearity encountered.