大跨度悬挑混凝土框桁架结构静力弹塑性分析

Static Elastic-plastic Analysis of Large-space Cantilevered Concrete Truss-frame Structure

以遵义市规划展览馆工程为背景,对大跨度混凝土悬挑框桁架杂交结构作详细的静力弹塑性(Push-over)分析研究。结果表明:结构整体性能点位于"小震不坏"与"大震不倒"之间,并且离"大震不倒"仍有一段距离,主体结构仍处于强度上升阶段,具有一定安全储备;观察塑性构件分布情况及出现顺序,得到结构满足"强柱弱梁"要求、耗能机制合理、变形能力良好的结论;地震作用正交方向上的桁架塑性构件主要出现在顶层外围梁的中间部位,在设计过程中应予以加强。

Based on the project of Zunyi Planning Exhibition Hall, this paper provides detailed static elasticplastic analysis （Push-over） of large-space cantilevered concrete truss-frame structure. Research shows that, firstly, total performance point of structure is between two seismic fortification standards of ＂ no damage under small earthquakes＂ and ＂no collapse under strong earthquakes＂ and it is far away from ＂no collapse under strong earthquakes＂. This suggests that the intensity of major structure is on the upswing and it also has a safety reserve. Secondly, by looking at pictures which show the distribution of plastic components and the order that plastic components appear, we can get the conclusions that the structure complies with the request of ＂strong columnweak beam＂ , energy-consuming mechanism of structure is reasonable, and the deformation capacity of structure is good. Lastly, there are some plastic components of truss at orthogonal directions of earthquake action direction, which need to be fortified during the design process.