Structural Design II
The courses Structural Design I and II explain the fundamentals of how structures function. These courses put great emphasis on studying the relationship between the form of a structure and the internal forces within it by means of graphic statics.
Thrust line and Bending in Frames
The last exercise deals with bending moments. The bending moments at three-hinged frames with different load cases are examined. In order to this, the deviation of the frame geometry from the thrust line of the given load case is taken into account. The bending moment is also used to perform the dimensioning of the structure.
Bending moments in frames
The deviation of the frame geometry from the thrust line or the application of point loads can result in bending moments in a frame. For the same load and boundary conditions, the support reactions remain identical for any shape. The normal force in the thrust line at any chosen point of the structure can be determined by parallel moving the tangent to the thrust line at this point from the form to the force diagram.
Bending moment in a frame due to a point load
The bending moment in a frame, which is loaded with a point load, can be determined by means of the thrust line. Based on the determined bending moment, the dimensioning of the frame is performed.
Bending moment in a frame due to a line load
The bending moment in a frame, which is loaded with a line load, can be determined by means of the thrust line.
Three-hinged truss frame
By means of superposition, the reaction forces of a three-hinged truss frame are analyzed. The deviation of the frame geometry from the thrust line is used to determine the bending moment in the frame corner.
