自适应张弦梁结构的性能分析与设计

Performance analysis and design of adaptive beam string structure

自适应张弦梁结构是可根据外部荷载变化调节结构中的预应力实现对结构受力状态控制的智能结构.本文通过结构控制分析,研究该类结构的性能随几何构形、构件截面特性和作动器工作性能等三类设计参数的变化规律.分析结果表明:增大垂跨比、作动器数量、作动器工作行程或减小梁弦刚度比均能够减小自适应张弦梁结构上弦梁的应力和位移,其中作动器的数量和工作行程影响最大;作动器数量和工作行程对上弦梁位移的影响大于对应力的影响,而垂跨比和梁弦刚度比的影响则相反.在结构性能研究的基础上,提出适用于自适应张弦梁结构的优化设计方法.

The adaptive beam string structure （ABSS） was a form of intelligent structure, which can control the working a status by adjusting the prestress of the structure according to the changes of external loads. The relationship between mechanical performance and design parameters, including geometries, section characteristic of element and working performance, was researched by structure control analysis. From which it was found that the upper-beam stress and displacement of structure can be increased by raising the sag-span ratio, number and working stroke of actuator, or decreasing the beam string stiffness ratio, of which the number and working stroke of actuator can affect loading capacity most. The number and working stroke of actuator were more sensitive to upper-beam stress than displacement, The others design parameter had the opposite effect. Based on the results of the structural loading capacity research, the optimization design method for engineering application of adaptive beam string structure is proposed.