PlaneFrameElementMomentDiagram.m PlaneFrameElementShearDiagram.m PlaneFrameElementStiffness.m PlaneFrameInclinedSupport.m PlaneTrussAssemble.m PlaneTrussElementForce.m PlaneTrussElementLength.m PlaneTrussElementStiffness.m PlaneTrussElementStress.m PlaneTrussInclinedSupport.m