关键词:
Civil and Environmental Engineering
摘要:
The successful design of structures consists of satisfying their functional requirements of strength and serviceability in an effective and integrated manner. The traditional strength based approach, in which structures are designed based on a consideration of strength and are then checked for serviceability constraints, lacks the ability of dealing with drift, acceleration, and damage efficiently. The proposed performance based approach for distributing stiffness, damping, and active control (where needed) provides a more rational design alternative to the strength based approach. This work is concerned with the development of a methodology for estimating the rigidity distribution in a building such that the response due to seismic excitation is close to the optimal state of uniform maximum inter-story deformation. The method is based on the superposition of modal rigidity contributions derived using various analytical models together with an iterative numerical scheme. Numerical results are presented for a wide range of fundamental periods. They provide an assessment of the variation in behavior with period, the degree of optimality of this type of passive control, and a logical starting point for the incorporation of active control.