Abstract
A seismic design procedure is developed to enable concrete buildings to be designed to achieve a specified acceptable level of damage under the design earthquake. The acceptable limit is defined as a displacement profile related to limit material strains or code specified drift limits. In this procedure, the elastic properties, including initial stiffness, strength and period, are the end product of the design rather than the starting point. It is shown that the procedure is simple to apply, and results in significant differences from the more conventional force-based procedure. Designs for multi-storey frame and wall buildings are presented, and target displacements are compared with results from inelastic time-history analysis.
Highlights
In recent years there has been extensive exarrrination of the current seisrrric design philosophy, which is based on provision of a required minimum strength, related to initial stiffness, seisrrric intensity, and a force reduction, or ductility factor considered to be a characteristic of a particular structural system and construction material
Presented are the results of a series of timehistory analysis performed on the buildings designed with displacement-based design
Note that there is no target displacement for force-based design, by showing the time-history analysis results of buildings designed with each method, the variation in damage achieved with forcebased design can be illustrated
Summary
In recent years there has been extensive exarrrination of the current seisrrric design philosophy, which is based on provision of a required minimum strength, related to initial stiffness, seisrrric intensity, and a force reduction, or ductility factor considered to be a characteristic of a particular structural system and construction material. To a larger extent this is true, and it is not unreasonable to characterize overseas developments in seisrrric design, in the USA and Europe, as efforts to obtain levels of safety and consistency sirrrilar to that which has been available in New Zealand since the early 1980' s Despite this rather satisfactory situation, it is clear that there is still considerable room for improvement in seisrrric design in New Zealand. This is largely the result of the inappropriateness of the two fundamental assumptions of force-based design: (]) that the initial stiffness of a structure deterrrrines its displacement response and (2) that a ductility capacity can be assigned to a structural system regardless of its geometry, member strength, and foundation conditions
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