Stresses in structural steel angles : with special tables . which is involved in the gen-eral equation for the section modulus, may be defined by themathematical expression, J=fxydA, (12) in which x, y\ are the coordinates of any infinitesimal area(dA).Also J = Jcg+Akh, (13) in which J = product of inertia for any given rectangularaxes; J eg = product of inertia for parallel axes through the center of gravity;A = area of the section;k, h = coordinates of the center of gravity with ref-erence to the given axes for which / isdesired. 6 STRESSES IN STRUCTURAL STEEL ANGLES For any symmetrical sect
Stresses in structural steel angles : with special tables . which is involved in the gen-eral equation for the section modulus, may be defined by themathematical expression, J=fxydA, (12) in which x, y\ are the coordinates of any infinitesimal area(dA).Also J = Jcg+Akh, (13) in which J = product of inertia for any given rectangularaxes; J eg = product of inertia for parallel axes through the center of gravity;A = area of the section;k, h = coordinates of the center of gravity with ref-erence to the given axes for which / isdesired. 6 STRESSES IN STRUCTURAL STEEL ANGLES For any symmetrical section Jcg is zero, or for such asection / becomes Akh. The product of inertia may be either a positive or a negativequantity. For an angle the valueof / will be positive for axes takenas shown at a and d of Fig. 2,and the value will be negative. for axesj as shown at h and c ofthe same figure. The numerical values of J forstructural steel angles are givenin the tables at the back of the book, to which the proper signmust be applied for each particular Fig. 2. Art. 4. Section Modulus Polygons If, for any given section, the values of the section modulusare computed for values of 6 from o to 360 degrees, and if
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