Figure 1. Concept sketch of children's buggy. 275mm F 1200mm 625mm 0 560mm 100mm 75° 700mm Figure 2. Basic configuration of children's buggy.
Hi, I have been given this pin-jointed frame analysis to solve (see pictures of the structure attached). Can you help me answer all the questions below? Especially the one about the bending moment and shear force.
The Figure 2 attached is a simplified structure to undertake a structural analysis on a concept design for a low cost stroller/buggy for children. The buggy consists of a number of metal sections that are pin-jointed together. The buggy is designed to accommodate a child of mass no more than 20 kg, sat on the seat which is supported at four points (Fc) on the frame of the buggy.
Assume that the weight of the child is equally distributed across all of the points indicated on Figure 2 as Fc. Assume that there are no additional forces applied to the handle of the buggy, that the buggy is static (stationary) and that the buggy, and the elements of the frame have no mass.
At points A and G, there are roll supports. At Points B, F and D there are the pin supports.
I am required to determine the following:
1) Draw a free-body diagram of the structure
2) Simplify the Free Body Diagram to allow the reaction force at A and G to be calculated
3) Calculate the Moment around A
4) Calculate the Moment around G
5) Determination of point of concurrency using graphic illustration
6) Use of force triangle to calculate the value of force at D, F and G.
7) Illustration of forces acting on ABCDE and use force polygon illustration
8) Calculations of perpendicular components of forces at A, B, C, D and E.
9) Calculate Bending Moments at A, B, C, D and E and draw a bending graph.
10) Illustration of shear force diagram at ABCDE.
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