合肥新桥国际机场航站楼转换节点模型承载性能有限元分析

Finite element analysis on the truss-to-box girder connection models of Hefei Xinqiao International Airport Terminal

为得到合肥新桥国际机场航站楼钢结构屋盖中转换节点构件的承载性能,以转换节点部分为重点研究对象,采用千斤顶单拉和单压加载的方式,进行了两个转换节点模型的试验研究.本文建立了试验构件的有限元模型,将试验结果与有限元计算结果进行了对比和分析.有限元计算有效模拟了试验构件的承载性能,试验和有限元结果吻合较好,证明了设计的合理性和安全性.缩尺构件为焊缝断裂的脆性破坏,足尺模型为钢管的压屈破坏,通过施加不同大小的初始缺陷,分析了初始缺陷对于转换节点构件承载性能的影响,发现转换节点构件对于局部的初始缺陷不敏感.通过试验模型的有限元分析,与试验数据相互验证,为设计提供了理论依据.

In order to get the bearing behaviors of the truss-to-box girder connections,two model experiments were carried out under tensile and compressive force by way of a single jack.Finite element models were established.The bearing behaviors of the connections were simulated and the results of experiments and FEM were compared.The experiment results and FEM results agreed well,and proved the design reasonable and safe.The scale model was in a brittle failure state with weld fracture,and the full scale model was with a compression buckling damage in the tube.The effects of different initial defects applied on the models were analyzed.The truss-to-box girder connection models were not sensitive to the initial defects.Conclusions of the truss-to-box girder connection FEM results provided theoretical basis for design as well.