无支撑大跨度甲板结构纵向稳定性试验与数值分析

Longitudinal Stability Test and Numerical Analysis of Supportless Long-span Deck Structure

为了合理预报无支撑大跨度甲板结构的纵向稳定性,进行了大尺度试验研究.在试验过程中,记录了甲板结构模型在轴压作用下不同位置的应力和变形分布.基于数值模拟,考虑初始挠度和实际材料属性等影响因素,研究加筋板的局部屈曲破坏模式和崩溃顺序,试验与数值模拟结果的比较表明:数值模拟可以合理地预测无支撑大跨度甲板结构在轴压作用下的极限强度.

In order to reasonably predict the longitudinal stability of unsupported long-span deck structures,large-scale experimental studies were carried out.During the test,the stress and deformation distributions at different positions of the deck structure model under axial compression were recorded.Based on numerical simulation,the local buckling failure mode and collapse sequence of stiffened plates were studied,considering the initial deflection and actual material properties.Compared with the numerical simulation results,the numerical simulation can reasonably predict the ultimate strength of unsupported long-span deck structures under axial compression.