Introduction:

You have been asked to undertake a structural analysis on a concept design for a low cost stroller$/$buggy

for children. The structural analysis will allow the consideration and selection of the sections of each

part of the frame that will be capable of withstanding the forces that are being anplied, and will also

represent a low cost design. Figure $1$ shows a concept sketch of the buggy.

Figure $1.$ Concept sketch of children's buggy.

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 $20kg,$ sat on the seat which is supported at four points $($Fc$)$

on the frame of the buggy. Figure $2$ shows the basic configuration for the buggy from the side with all

the dimensions needed to perform the analysis and the points at which the loads are applied.

Notes:

Neglect the wheels of the buggy and any members that run across the width of the buggy. Assume that

the weight of the child is equally distributed across all of the points indicated on Figure $2$ as F$.$

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 has no mass.

The Task:

Individually, you are required to determine the following:

Consider how to simplify the buggy with respect to geometry and the forces applied, and then

draw a draw a free body diagram illustrating the forces and the reactions. Consider how the free

body diagram could be simplified further.

Calculate the reactions at points A and $G$ as a result of the weight of the child.

Use$|$the graphical technique to resolve the forces in the three individual sections of the buggy

shown in Figure $2$: Section ABCDE, Section DFG$,$ and Section BF$.$

Accurately illustrate the forces on each of the three individual sections.

For the Section ABCDE, draw a shear force and bending moment diagram.