薄壁箱梁内力影响面的实用计算方法

Practical Calculating Method on Inner Force Influence Field of Thin-wall Box Girder

根据功的互等定理,利用四节点壳体单元刚度矩阵的物理特性以及结构内力(应力)影响面的概念,推导出薄壁箱梁结构指定截面内力(应力)影响面的实用计算方法,并通过算例验证了该方法的可行性。结果表明:该方法能极大地节约计算工作量,在实际箱梁结构设计计算中,特别是大型复杂宽体箱梁结构的三维设计计算中具有广泛的工程应用前景;且该方法实现了板壳结构内力影响面计算的可视化,解决了利用通用有限元软件不能进行结构内力影响面计算与图形输出的难题。

Based on reciprocal theorem of work, using physical property of four-joint shell element rigidity matrix and concept of structural inner force influence field, a practical calculating method was deduced to calculate inner force influence field of thin-wall box girder and feasibility of the method was verified. Results show that the method can save work capacity and has wide application foreground on 3-D design in practical box girder design, especially in large-scale composite wide box girder structure design. The method realized the calculation visualization of inner force influence field in plate-shell structure and also solved the problem that structural inner force influence field could not be calculated and graph output was not easy to realize by using general finite element software.