我的模型（三維）中有梁部件，也有桁架部件，它們在節點處相連。

建模過程：首先把梁部件和桁架部件裝配到一起，然后用“合并”命令合并到一起，然后在分別賦予“BEAM"/"TRUSS"截面，然后設置分析步，加載荷載，劃分網格，最后運行。

運行時出現如下敬告：For two-dimensional models, if a non-unity thickness is specfied for two-dimensional solid elements an these elements are involve in a interaction such as contact, the same thickness should be specified for the out-of plane thickness of the corresponding surface under *surface interaction.

我是初學者，希望高手指點。