“变刚度”法在网壳结构设计中的应用

The Application of the Rigidity-modulating Method in the Space Shell Design

网壳结构杆件之间的连接 ,无论是采用螺栓球节点或者焊接空心球节点 ,都不可能实现完全的柔性或完全刚性连接 ,这就给结构的设计造成了一定的困难 .针对这个问题 ,提出了“变刚度”的内力分析方法 ,即在梁单元有限元法的基础上 ,引入α系数 (0 <α≤ 1.0 )对杆件惯性矩进行调节以模拟球节点的刚性反映 ,随着α取值的不同 ,可以得出网壳结构处于不同刚度连接状态下的内力变化规律 。

This paper proposes a rigidity-modulating analysis method based on the finite beam element method for the space shell design. By introducing the α-coefficient, the method can change the pole's inertia moment in order to stimulate the global joint's rigidity. The rule of the internal force variation can be drawn when the space shell was under different rigidity connecting condition, thus the value of the rigidity of the global joint can be provided for reference.