自适应张弦梁结构的内力控制理论研究

发布时间：2018-04-29 21:36

本文选题：自适应张弦梁 + 内力控制　；参考：《工程力学》2014年06期

【摘要】：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,实现对结构工作状态控制的智能结构。该文首先分析自适应张弦梁结构的工作机理;然后建立结构的内力状态方程;接着对在风吸作用下下弦拉索退出工作的内力控制问题进行分析,并建立相应的控制模型;再对在移动荷载作用下上弦梁受力不均匀的内力控制问题进行分析,根据移动荷载的大小和移动速度,将荷载空间划分为无时滞可控区域和有时滞控制区域,并以结构最合理内力分布状态为目标分别建立各可控区域内力控制模型;最后通过数值算例验证该类结构的工作性能。数值结果表明,相对于普通张弦梁结构,自适应张弦梁结构通过自适应控制能够降低结构的内力峰值和初始预应力水平要求,并提高结构的承载力。
[Abstract]:Adaptive beam string structure is an intelligent structure which can adjust the prestress of the structure according to the change of external load and realize the control of the working state of the structure. This paper first analyzes the working mechanism of the adaptive beam string structure, then establishes the internal force state equation of the structure, then analyzes the internal force control problem of the chord cable exiting under the action of wind suction, and establishes the corresponding control model. Then the internal force control problem of the upper chord beam under moving load is analyzed. According to the size and speed of moving load, the load space is divided into controllable region without delay and control region with time delay. Taking the most reasonable distribution of internal forces as the goal, the internal force control models of each controllable region are established, and the performance of the structures is verified by numerical examples. The numerical results show that the adaptive beam string structure can reduce the peak internal force and initial prestress level of the structure and improve the bearing capacity of the structure by adaptive control compared with the ordinary beam string structure.
【作者单位】：浙江大学空间结构研究中心浙江省空间结构重点实验室;
【基金】：国家杰出青年科学基金项目(51025828) 国家自然科学基金项目(51008271) 浙江省自然科学基金项目(LY13E080002)
【分类号】：TU399

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