NONLINEAR 3-D DYNAMIC ANALYSIS USING AN INCREMENTAL LINEAR APPROACH: APPLICATION TO REINFORCED CONCRETE FRAME BUILDINGS WITH BRICK INFILL PANELS

摘要

A nonlinear three-dimensional dynamic analysis is developed based on the superposition of linear dynamic responses using the partition of the response spectrum as input motion, in an incremental approach. After the description of the method, an application is made to two different reinforced concrete (RC) frame building infilled with brick panels. The nonlinear behaviour of the frame is concentrated at the frame nodes and the brick panels are represented by nonlinear diagonal struts. For the first building, a planar structure, the results of this method are compared with the ones produced by "pushover analysis" proposed by ATC-40. Finally, an application to a three-dimensional RC building illustrates the potentiality of the method. The buildings were subjected to increasing seismic loads until total collapse. A global vulnerability function based on the decrease of frequency was also obtained.