Failure Modes-Based Multi-levels Optimization Design of Structures

The failure modes-based optimization of structure is that the non-idea failure modes of structure transform into idea failure modes, which causes the probability of structure collapse is reduced. Therefore, a new optimal approach based on strong column?weak beam failure modes multi-levels optimization design is proposed. The procedure of multi-levels optimization design is that the first level minimizes the cost of concrete subject to elastic displacement constraint due to a minor earthquake, and the second level minimizes the cost of shaped steels and reinforced bars subject to constraints on inelastic displacement caused by moderate and severe earthquakes. Explicit forms of the objective functions and constraints in terms of member sizing variables are formulated to enable computer solution for the optimization model. And a six-story steel reinforced concrete frame structure is cited to illustrate the method.