Analysis And Simulation Research Of Construction Dynamics For Cable-Strut And Beam Steel Structure

For flexible large span steel structures, the investigation of the deformation and stress in construction process can not be neglected. Considering there is rigid body motion in this system, therefore, traditional FEM is incapable of solving the problem. In this thesis, based on the dynamics of flexible multi-body systems, the analysis of dynamical systems of cable-strut and beam steel structure and the corresponding simulation research is addressed.During the construction process of structures, rigid-body motion and elastic deflection occur simultaneously. Traditional FEM can only be applied to kinematically determinate structures, and it is incapable of solving the hoisting process problem. In this thesis, the calculation strategy based on dynamics of flexible multi-body systems is presented and applied to these engineering systems. An inertial frame serves as a global reference frame for describing the rigid body motion of the multi-body system. In addition, intermediate reference frames that are attached to each flexible component and follow the average local rigid body motion (rotation and translation) are used. The motion of the component relative to the intermediate frame is, approximately, due only to the deformation of the component. This hybrid description of this thesis can simultaneously consider the rigid-body motion and elastic deflection of the structure, including their coupling effects. The method is applicable to the conditions with or without rigid-body motion, and its performance is not affected by the extents of the rigid-body motion. Numerical examples demonstrate that the method of this thesis is with high precision, and validate that the coupling effects between rigid body motion and elastic deflection cannot be neglected.Based on the theory of dynamics of flexible multi-body systems, two elements, namely, cable-strut element and beam element are developed. The azimuths of the elements are described by direction cosine and Euler quaternion, respectively. The shape function of the element is selected to describe the basic elastic mode. For the...