The optimization of civil engineering structures usually involves a number of requirements that should be met at the same time in order to obtain a useful design. In the case of single criteria optimization, one of the requirements is selected as the criterion of optimization while the remaining ones are met by including them into the constraints of optimization. However, while using this approach it is necessary to determine a priori the bounds which these requirements should fulfill a priori. Multicriteria (vector) optimization enables the designer to consider effectively all the different, mutually conflicting requirements inherent in the design problem.