Abstract
This paper describes the proposed circular framed structure and the developed method for impact response evaluation of structure. We propose a new concept of body structure, which is composed of the standardized circular unit members and is bundled together in parallel regions. To evaluate this circular framed strucure in the conceptual design stage, impact response evaluation method is developed. The main features of this method are three items shown below. (1) The dynamic FEA program of three dimensions using beamelerrent (nonlinear spring is included). (2) Joint stiffness is expressed by rotational stiffness of the end of a beam. (3) Newmark 13 method is used for time integration. By updating the geometry and calculated results, geometrical nonlinearity is also taken into consideration. The effectiveness of this proposed circular framed body strucure and the validity of the evaluation method were shown by some example calculations.
