The purpose of this study is to determine the ratio of the demand to capacity in knee element in the bracing system called Chevron's knee bracing. The overall idea is that the design is to be carried out so that only the knee element is yielding in the severe earthquakes, and the other members remain resilient, or the number of plastic hinges in the beams and columns, and the buckling of the braces, is significantly reduced. In this study, two models of bending and shear elements with 2, 6 and 10 floors and two types of 2 and 4 bays are considered. In the bending mode, the BOX section and in shear mode the IPE sections are used. In this study, the behavior of the structure and the process of forming plastic hinges in frames with design state that the ratio of the demand to capacity smaller than one and state that the ratio of the demand to capacity larger than one has been investigated. The yielding of elements in the nonlinear static analysis is in accordance with what was expected. Knee Elements Before the buckling braces in each story were yielded in all models examined. Hence, it can be guessed that the design of knee element, according to 120 - 140 percent of their elastic capacity, is an appropriate strategy to ensure that the knee elements are the first elements that help to the structure to energy dissipated by forming Plastic hinges.