Fo FL FR Fr Fo 15 mm 73 mm 30 mm 40 mm 50 mm y mm Prob. 4–107
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
A biomechanical model of the lumbar region of
the human trunk is shown. The forces acting in the four
muscle groups consist of FR = 35 N for the rectus,
FO = 45 N for the oblique, FL = 23 N for the lumbar
latissimus dorsi, and FE = 32 N for the erector spinae. These
loadings are symmetric with respect to the y–z plane.
Replace this system of parallel forces by an equivalent force
and couple moment acting at the spine, point O. Express the
results in Cartesian vector form.
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