荷载多工况下超静定桁架工作状态控制途径

Control method to make working state of statically indeterminate truss under multi loading cases more reasonable

利用超静定桁架的内力耦合特性 ,把调整桁架工作状态的控制模型由荷载单工况推广到多工况 ,通过截短少量杆件 ,使结构在多工况下的受力状态更为合理 ;采用了临界约束初选策略 ,避免因荷载多工况引起的计算规模的增长 ,相应的算法保持在原有单工况的规模 ;线性规划模型给出了桁架算例的满意结果 .

Utilizing the coupling characteristics of internal forces of statically indeterminate truss, the control model adjusting the working state of truss has been extended from single loading case to multiple loading cases. The load bearing states of the structure are more rational under multiple load cases by reducing the length of a few bars. A strategy of an initial selection for critical constraints is implemented to avoid the increasing calculation scale owing to multiple loading cases whose corresponding algorithm has been kept in the original scale of the single loading case. As a linear programming, the model gives a number of satisfactory computations of truss examples.