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为了提高索杆张力结构的刚度和减小结构受力,在结构杆件中引入作动器,主动调整杆件的长度,改变结构的形状.在荷载态下,将作动器主动工作产生的杆件内力改变量视为结构独立自应力模态的线性组合,根据虚功原理及变形协调关系建立了节点位移向量、杆件内力向量与作动器主动调整量之间的迭代关系.同时,以杆件受力最小为目标,构造了结构形状优化模型并编制了相应的求解程序.算例分析表明:结构所有杆件均布设作动器的效果与仅在索中布设作动器的效果相同,均可以实现既提高结构刚度、又改善结构受力的目的;仅在杆中布设作动器调节杆长来提高结构刚度的代价是增大杆件的内力.通过有限元方法与本文方法对算例求解结果的对比分析,发现两者符合较好,验证了本文方法的正确性.
In order to improve the rigidity of the cable tension structure and reduce the force of the structure, an actuator is introduced into the structure rod to adjust the length of the rod actively and change the shape of the structure. In the load state, the active work of the actuator is generated The internal force variation of the rod is regarded as a linear combination of the independent self-stress modes of the structure. According to the virtual work principle and the deformation coordination relationship, the iterative relationship between the node displacement vector, the internal force vector of the rod and the active adjustment of the actuator is established, With the aim of minimizing the force of the bar, the structural shape optimization model is constructed and the corresponding solving program is compiled.The example analysis shows that the effect of all the actuators in the structure is the same as that of the actuator The same, can achieve not only improve the structural rigidity, but also to improve the structure of the force purposes; only the actuator in the rod to adjust the length of the rod to increase the structural rigidity of the cost is to increase the internal force of the rod through the finite element method and the method Comparing and analyzing the results of the example, it is found that the two are in good agreement, which verifies the correctness of the method in this paper.