Formulas - Same Section Properties （A , e , I , Z , i ) group 3

Formulas - Same Section Properties （A , e , I , Z , i ) group 3

Top page	Handbook of Mathematics	Collection－Mathematics Formulas	Structural Calculation Program	Take a break
	Handbook of Physics	Foumulas－Area・Volume	Foumulas－Structural Beam	.

Group of the same section properties, cf. following cross section	・
A：Area （Units²） e：Extreme point（Units）	I：Moment of Inertia（Units⁴） Z：Section Modulus（Units³） →　I/e i：Radius of Gyration（Units）　→ √（I/A）
A = BH - b ( e2 + h ) e1 = (aH² + bt²) / ( 2(aH + bt)) e2 = H - e1	I = ( Be1³ - bh³ + ae2³ ) / 3 Z = I / e1 　：　Z = I / e2 i = √( I / A )

In the following cross section When b = B-a and h = e1-t are all the same, In a calculation, it is A: Area , e1 and e2: Extreme point I: Moment of Inertia, Z: Section Modulus, i: TRadius of Gyration becomes all same. But, as for the torsion strength, strength may not be the necessarily same because it is different.
	It is the sample as the basic figure.
	The positions of the centroid are different in the figure of right and left, The distance from top and bottom agrees, The section properties (A,e,I,Z,i) becomes same in a calculation. 　 The number of number of sheets of the rib is how many, If the total of the thickness of the board long is "a", The section properties (A,e,I,Z,i) becomes same in a calculation.
	By the way, The section properties (A,e,I,Z,i) becomes same in a calculation.
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