Integrated design optimization of base-isolated concrete buildings under spectrum loading |
| |
Authors: | X K Zou |
| |
Affiliation: | (1) Ove Arup & Partners Hong Kong Ltd, Level 5 Festival Walk, 80 Tat Chee Avenue, Kowloon Tang, Kowloon, Hong Kong, People’s Republic of China |
| |
Abstract: | Base isolation has become a practical control strategy for protecting structures against seismic hazards. Most previous studies
on the optimum design of base-isolated structures have been focused on the design optimization of either the base isolation
or the superstructure. It is necessary to simultaneously optimize both the base isolation and the superstructure as a whole
to seek the most cost-efficient design for such structures. This paper presents an effective numerical optimization technique
for the seismic design of base-isolated concrete building structures under spectrum loading. Attempts have been made to automate
the integrated spectrum analysis and design optimization procedure and to minimize the total cost of the base-isolated building
subject to design performance criteria in terms of the interstory drifts of the superstructure and the lateral displacement
of the isolation system. In the optimal design problem formulation, the cost of the superstructure can be expressed in terms
of concrete member sizes while assuming all these members to be linearly elastic under earthquake actions. However, the isolation
system is assumed to behave nonlinearly, and its cost can be related to the effective horizontal stiffness of each isolator.
Using the principle of virtual work, the lateral drift responses of concrete base-isolated buildings can be explicitly formulated
and the integrated optimization problem can be solved by the optimality criteria method. The technique is capable of achieving
the optimal balance between the costs of the superstructure and the isolation system while the design performance criteria
can be simultaneously satisfied. One practical building example with and without base isolation is used to illustrate the
effectiveness of the optimal design technique. |
| |
Keywords: | Response spectrum analysis Structural optimization Optimality criteria method Principle of virtual work Drift design Base isolation Base isolator |
本文献已被 SpringerLink 等数据库收录! |
|