7. Inclined Support

It may happen that the support condition of the structure is in an inclined direction when viewed on the basis of the global coordinate system.
In this case, attention is required because the deformation and member forces of the structure have a different aspect than when the support condition is vertical or horizontal to the global coordinate system.

Figure 7.2 shows two structures with the same shape but slightly different support conditions.
In Figure 7.2(a), point C is constrained in the same direction as the BC member, but in Figure 7.2(b), point C is constrained in the vertical direction.

Figure 7.3 shows the axial force diagram, shear force diagram, and bending moment diagram for the two structures.
As can be seen in the figure, there was a big difference in the member strength of the structure due to the difference in support conditions.

In the figure (a), a reaction force is generated only at point C, and only the BC member receives an axial force of 10 kN.
However, in Figure (b), a reaction force is generated at point A, and both AB and BC members receive a bending moment.