Introduction - If you have any usage issues, please Google them yourself
the procedure used to prepare fortran functions : 1. calculation of the load under the plane truss rod displacement and the axial force. Symbol axial force, the tension is positive, negative pressure. It also supports anti-hum calculating power. 2, the number of nodes truss, the first series to take movable joints, and then re-allocation fixed nodes. 3, the calculation of multi-state issues this procedure from the "bar structural design process," with changes, the original procedure is wrong