双向正交密加筋板的极限强度预报

采用数值分析方法,对一系列单轴受压的双向正交密加筋板进行了有限元非线性计算。基于有限元数值计算结果和正交异性板理论,引入纵向加强筋的柔度λx、横向加强筋的柔度λy以及密加筋板的柔度β这3个参数变量,提出了关于这3个参数变量的双向正交密加筋板极限强度预报公式。对3种类型加强筋的双向正交密加筋板的极限强度分析结果表明,预报公式结果与有限元计算结果的绝对误差很小,能准确预报双向正交密加筋板的极限强度。

Prediction on Ultimate Strength of the Two-Way Orthogonal Multi-Stiffened Plates

Nonlinear FEM has been performed to a series of two-way orthogonal multi-stiffened plates sub jected to axial compression load.Based on numerical results and orthotropic plate theory,we introduced three parameters,which were longitudinal column slenderness ratio λx,transverse column slenderness ra tio λy,and plate slenderness ratio β,to form a prediction formula to calculate the ultimate strength of two-way orthogonal multi-stiffened plates.Then the ultimate strength for three types of multi-stiffened plates was analyzed.The results show that the calculation data agree well with the results of finite element analysis,and the proposed prediction formula is able to accurately predict the ultimate of two-way orthogo nal multi-stiffened plates.