铝合金舟桥甲板结构极限承载能力模型试验与数值分析

Numerical Calculation and Model Test for Ultimate Strength of Aluminum Alloy Pontoon Deck Panel

铝合金夹心板结构是现代舟桥甲板常用的结构形式,具有重量低、强度高的优点。本文针对五种铝合金夹心板模型(两种型材断面)进行了静态极限承载能力模型试验,并作了相应的非线性有限元数值模拟。数值计算中考虑了材料非线性和几何非线性效应,有限元模型中还考虑了坦克履带的刚化作用和初始焊接变形的影响。研究表明,铝合金夹心板在横向履带载和轮载的作用下,主要表现为受压面板的屈曲和夹心斜撑板的屈曲。本文的试验和计算结果符合较好,表明了二者的有效性。

Aluminum alloy sandwish panel is widely used in modern pontoon deck structures, due to its advantage of low weight and high strength. The present analysis aims to describe the static ultimate strength tests for 5 kinds of models (2 type of cross section) and the coresponding numerical calculation based on MSC/NASTRAN code. Both the material nonlinearity and geometrical nonlinearity effect were taken into account in the FEM mode, also the rigid effect of tank pedrail and the panels initial welded residual deformation were considered. The results shows that the anluminum alloy sandwish deck under lateral pedrail deck load and wheel load would fail in the form of compression buckling. The model test results match the numerical results quite well, which prove their validity.