自适应张弦梁结构的内力控制理论研究

daptive beam string structure was a form of intelligent structure, which can control the working status by adjusting the prestress of the structure according to the changes of external loads. Firstly, the working mechanism of the structure was analyzed. Next, the equations of structural force status were established. And then the force control problem of slack of the lower chord cable caused by the negative air pressure was analyzed, and the corresponding control models was built. Furthermore, the force control problem of inhomogeneous internal force of upper chord beam caused by the moving load was analyzed, while the load space was divided into controllable regions with time lag or not according to the magnitude and moving velocity of the moving loads. The control models of each controllable region are built respectively for optimising structural force status. Finally, a numerical example was conducted to verify the working performance of the structure.