基于结构应变能的组合空腹板架结构构件重要性评估方法研究

钢-混凝土组合空腹板架是一种较新的组合结构形式,构件总量多,荷载分配量化有困难,设计时没有经验可依赖;因此有必要对结构中构件的重要性程度进行研究。讨论了组合空腹板架结构的构件重要性评估方法,利用结构应变能增量来衡量构件对结构整体性能贡献的大小,得到了构件重要性指标。通过24 m×18 m、四边简支的空腹板架算例,找出了结构在竖向均布荷载作用下的重要构件为短边方向中心区的肋梁。结论可作为设计阶段结构优化的依据,根据构件的重要性指标设置不同的安全储备来达到安全性和经济性的平衡。

Evaluation Method of Member Importance of Composite Open-Web Floor Based on Structural Strain Energy

As a novel structure type, composite open-web floor owns a large number of members, and it is hard to quantify the information of load transfer mechanism without design experience to rely on when conducting design. An evaluation method of member importance of composite open-web floor was discussed to calculate the member important factor, among which structural strain energy was chosen to measure structural performance. The evaluation process was carried out by an example of open-web floor, and the most important members were identified under the vertical uniformly distributed load. The conclusion could be utilized by the designers as the proof of structural optimization in order to reach the balance of safety and economic efficiency.