To model inheritance on a class diagram, a solid line is drawn from the child class (the class inheriting the behavior) with a closed, unfilled arrowhead (or triangle) pointing to the super class.
The pipeline bridge is built up with triangle sections, its shear stiffness can be derived from the stress diagram for the truss with triangle section.
在管道跨越工程中,常用三角形截面组合管拱,由三角形截面桁梁的受力分析图,分析推导出其抗剪刚度。
3
Diagram 17 shows a triangle constructed using a piece of string.