Lesson 5: Gravity Load Path

What Supports What?

What Supports What?

What Supports What?

What Supports What? 2 G1 G2

What Supports What? – LOAD PATH 2 G1 G2

What Supports What? – LOAD PATH G2

What Supports What? – LOAD PATH G2 B C

What Supports What? – LOAD PATH G2 B C

What Supports What? – LOAD PATH 2 3 G2 B C

What Supports What? – LOAD PATH B

What Supports What? – LOAD PATH G2 1 B

Prob.1: 300plf 600plf Beams 1 and 4: 300 plf Beams 2 and 3: 600 plf

Prob.1: All Members are W16x50 300plf 600plf Beams 1 and 4: 300 plf Beams 2 and 3: 600 plf 600plf 300plf

Simple-Braced Building

Simple-Braced Building

All Connections Simple (pins)

Building System Parts/Terms

Building System Parts/Terms

Building System Parts/Terms Column

Building System Parts/Terms Fill Beam Column

Building System Parts/Terms Fill Beam Girder Column

Building System Parts/Terms Interior Fill Beam Interior Girder Exterior Fill Beam Exterior Girder Column

Brace (truss) 1 Story Building

Slab = “Diaphragm” Brace prevents X-direction Movement of this point

Slab = “Diaphragm” Brace prevents X-direction Movement of this point Y-direction Movement of this point

Slab = “Diaphragm” Brace prevents X-direction Movement of this point Y-direction Movement of this point Slab is rigid in X-Y Plane. Slab is connected to every other point

Slab = “Diaphragm” Braced Braced Braced Braced Braced Braced Braced Slab is rigid in X-Y Plane. Slab is connected to every other point. Therefore: Slab + braced points = Every column is braced. Braced

Slab = Diaphragm: a body that with planar rigidity Slab = Diaphragm: a body that with planar rigidity. With several braces and a floor diaphragm, all columns are braced Braced Braced Braced Braced Braced Braced Braced Braced Braced Braced Braced Braced Braced Braced Braced Slab is rigid in X-Y Plane. Slab is connected to every other point. Therefore: Slab + braced points = Every column is braced. Braced

1 Story Building Beam-Column Connections: Pins Foundations: Pins

1 Story Building mmmmm… Strangely familiar…..

1 Story Building

1 Story Building

1 Story Building

1 Story Building

Homework Lesson 4

Beam FBD’s

6k 6k 6k Beam FBD’s

Gravity, only 60k 60k 60k 60k 60k 60k Beam FBD’s

Gravity, only 60k 60k 60k 60k 60k 60k 60k 120k 120k 60k Column FBD’s

Now, Adding Lateral Force 60k 60k 60k 60k 60k 60k 0k 0k 0k 60k 120k 120k 60k Column FBD’s

Now, Adding Lateral Force 60k 60k 60k 60k 60k 60k 0k 0k 6k 0k 60k 120k 120k 60k Column FBD’s