连续刚构桥的内力包络图

Internal Force Envelope Diagram of the Continuous Frame Bridge

利用计算机仿真的方法给出了连续刚构桥的内力包络图.令汽车标准荷载以足够小的步长在桥梁上通过,每一步用有限单元法画出桥梁结构的内力图.当移动荷载的加重车移出桥梁时,这些内力图将充填成一个区域.这个区域的边界线就是相应内力的包络图.此内力包络图的算法可以取代影响线方法.

In this paper, the internal force envelope diagram of the continuous frame bridge was calculated by computer simulating. The standard loads moved on the highway＇s bridge with the small step length. For each step, internal force diagram of the bridge was plotted by finite element method. As the loads pass through the bridge, these internal force diagrams would be filled into a range. The boundary of the range was just the internal force envelope diagram. The algorithm of internal force envelope diagram in this paper is the substitute of influence line method. The algorithm is more direct and more effective than influence line method.