A seismic design strategy for hybrid structures

To complement existing capacity design procedures adopted in New Zealand for reinforced concrete buildings in which earthquake resistance is provided by ductile frames or by ductile structural walls alone, an analogous methodology is presented for the design of ductile hybrid structures. First the concepts of this deterministic design philosophy are highlighted. Modelling and types of structures in which the mode of wall contribution is different are presented. A step by step description of a capacity design procedure for a structural system in which fixed base ductile frames and walls, both of identical height, interact, is presented. The rationale for each step is outlined and, where necessary, evidence is offered for the selection of particular design parameters and their magnitudes. Brief references are made to the effects of deformable wall foundations. A number of issues which require further study are briefly outlined. It is believed that the methodology is logical, relatively simple and that, when combined with appropriate detailing, it should ensure excellent seismic structural response.