Abstract
In general steel truss structures, the natural frequency of a member is sufficiently high in comparison to the lower level frequencies of the structure. Therefore, a member does not usually resonate with the structure. The natural frequency of a member tends to be reduced by compressive force. In case that compression force comes close to Euler's buckling load or a part of member reaches plastic region, its frequency is particularly reduced to the range of structure's lower level frequencies. For clarifying nonlinear dynamic behaviors of truss structures, this, paper estimates the resonant behaviors of the members under a large axial force and lateral vibration.
