# Introduction to Structural Member Properties

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1 Introduction to Structural Member Properties

2 Structural Member Properties Moment of Inertia (I): a mathematical property of a cross-section (measured in inches 4 or in 4 ) that gives important information about how that cross-sectional area is distributed about a centroidal axis. Pertains to stiffness of an object related to its shape. In general, a higher moment of inertia produces a greater resistance to deformation. istockphoto.com istockphoto.com

3 Moment of Inertia Principles Joist Plank Beam Material Length Width Height Area A Douglas Fir 8 ft 1 ½ in. 5 ½ in. 8 ¼ in. 2 B Douglas Fir 8 ft 5 ½ in. 1 ½ in. 8 ¼ in. 2

4 Moment of Inertia Principles What distinguishes beam A from beam B? Will beam A or beam B have a greater resistance to bending, resulting in the least amount of deformation, if an identical load is applied to both beams at the same location?

5 Moment of Inertia Principles Why did beam B have greater deformation than beam A? Because of the difference in moment of inertia due to the orientation of the beam. Calculating Moment of Inertia Rectangles

6 Calculating Moment of Inertia Calculate beam A moment of inertia = = = 1.5 in. 5.5 in in in in = 21 in.

7 Calculating Moment of Inertia Calculate beam B moment of inertia = 5.5 in. 1.5 in = = in in in = 1.5 in.

8 Moment of Inertia 14Times Stiffer Beam A Beam B I = 21 in. A 4 I = 1.5 in. B 4

9 Moment of Inertia Composite Shapes Why are composite shapes used in structural design?

10 Non-Composite vs. Composite Beams Doing more with less Area = 8.00in. 2 Area = 2.70in. 2

11 Structural Member Properties Chemical Makeup Modulus of Elasticity (E): The ratio of the increment of some specified form of stress to the increment of some specified form of strain. Also known as coefficient of elasticity, elasticity modulus, elastic modulus. This defines the stiffness of an object related to material chemical properties. In general, a higher modulus of elasticity produces a greater resistance to deformation.

12 Modulus of Elasticity Principles Beam Material Length Width Height Area I A Douglas Fir 8 ft 1 ½ in. 5 ½ in. 8 ¼ in in. 4 B ABS plastic 8 ft 1 ½ in. 5 ½ in. 8 ¼ in in. 4

13 Modulus of Elasticity Principles What distinguishes beam A from beam B? Will beam A or beam B have a greater resistance to bending, resulting in the least amount of deformation, if an identical load is applied to both beams at the same location?

14 Modulus of Elasticity Principles Why did beam B have greater deformation than beam A? Because of the difference in material modulus of elasticity (the ability of a material to deform and return to its original shape). Characteristics of objects that affect deflection (ΔMAX): 1. Applied force or load 2. Length of span between supports 3. Modulus of elasticity 4. Moment of inertia

15 Calculating Beam Deflection 3 FL ΔMAX = 48EI Beam Material Length (L) Moment of Inertia (I) Modulus of Elasticity (E) A Douglas Fir 8.0 ft in. 4 1,800,000 psi B ABS Plastic 8.0 ft in ,000 psi Force (F) 250 lbf 250 lbf

16 Calculating Beam Deflection 3 FL ΔMAX = 48EI Calculate beam deflection for beam A 250lbf 96in. ΔMAX = 48 1,800,000psi 20.80in. 4 3 ΔMAX = 0.12 in. Beam Material Length I E Load A Douglas Fir 8.0 ft ,800,000 in. 4 psi 250 lbf

17 Calculating Beam Deflection 3 FL ΔMAX = 48EI Calculate beam deflection for beam B 250lbf 96in. ΔMAX = ,000psi in. 4 3 ΔMAX = 0.53 in. Beam Material Length I E Load B ABS Plastic 8.0 ft in ,000 psi 250 lbf

18 Douglas Fir vs. ABS Plastic 4.24 times less deflection ΔMAX A = 0.12 in. ΔMAX = 0.53 in. B

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