A so-called "trapeze bar" in a hospital room provides a means for patients to exercise while in bed (see figure The bar is 2.3 m long and has a cross section in the shape of a regular octagon. The design load is 1.4 kN applied at the midpoint of the bar, and the allowable bending stress is 180 MPa. Determine the minimum height h of the bar. Round to one decimal place. (Assume that the ends of the bar a simply supported and that the weight of the bar is negligible.) hmin mm

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Methods to Determine Vertical Stress

The load applied to the soil is transferred to the underground. The presence of water at soil pores and solid grains above the soil are the primary components that are responsible for the effective load transfer. Due to the load acting, the internal component of the soil or the underground formations undergoes deformations or a tectonic shift. The amount of deformation depends upon the amount of load acting on the soil surface, which indeed, depends on the weight of everything present above the soil. Due to this, the underground soil element develops internal stresses which try to resist the tectonic changes.