Simple beam construction is construction ditumpu on two fulcrum, each in the form of joint and rollers. This type of construction is a certain static, which can be solved with the balance equation. Construction simple beam with a concentrated load to be able to draw a field of SFD, NFD and BMD must first be calculated reactions vertical direction. As for calculating the magnitude of the reaction, can be done graphically or analytically.
Pictures 2:28. Results Shear force diagram (SFD),
Bending moment diagram (BMD), and Normal force diagram (NFD) the results of calculations by means of graphic graphical way done with the following steps:
1. Determine the distance scale and style scale (distance scale Suppose 1cm: 1m) and the style scale (1cm: 2kN).
2. Draw beam construction with a predetermined scale and extend the line of work force Pv, Av and Bv.
3. Describe the style becomes Pv and Ph.
4. Draw the painting poles and polygon stem so that the quantity of Av and Bv.
5. The magnitude of the reaction is equal to the length of the line is multiplied by scale style.
6. The amount of torque is equal to the length of the pole (II) multiplied by the high-ordinate the polygon stem (y) multiplied by the force scale and distance scale. (M = Hy style scale. The scale of the distance).
To prove the magnitude of M = H. Y, presented the following explanation. See Figure 2:28 above, triangular prt (in polygon stem) is congruent with the triangle Owx (on a painting pole), the obtained relationship: Triangle prt (in polygon stem)
Figure 2.29 graphically the method of proof moment