The principle states that the influence lines of an action ( force or moment ) assumes the scaled form of the deflection that the structure displays after removing the restraint on the point where the action is evaluated and applying a point load at that point which causes a unit displacement.
42.
This will create a continuous influence line, but the slopes will be equal and opposite on either side of the hinge at point B . Since the beam is simply supported, its end supports ( pins ) cannot resist moment; therefore, it can be observed that the supports will never experience moments in a static situation regardless of where the load is placed.
43.
R . C . Hibbeler states, in his book " Structural Analysis ", All statically determinate beams will have influence lines that consist of straight line segments . Therefore, it is possible to minimize the number of computations by recognizing the points that will cause a change in the slope of the influence line and only calculating the values at those points.
44.
R . C . Hibbeler states, in his book " Structural Analysis ", All statically determinate beams will have influence lines that consist of straight line segments . Therefore, it is possible to minimize the number of computations by recognizing the points that will cause a change in the slope of the influence line and only calculating the values at those points.
