Introduction to Bridges Different Types of Bridges And

Introduction to Bridges Different Types of Bridges And Examples of Structural Loading 12/3/2020 1

Schedule for Bridge Building Monday Tuesday Wednesday Thursday Friday 26) Intro; No school Sketch 03) Design; Full scale 10) Build 05) 06) C-day Continue 12) Build 13) ER Build 17) Build; Certify 19) Break 20) Clean up 12/3/2020 (Liddle) 2

Forces on Bridges: 3

Example Truss Bridges: 4

Example Truss Bridges: 5

Example Truss Bridges: 6

Example Bridges: 7

Examples: Structural Loads (truss depth) 15 mm deep 30 mm deep 8

Examples: Structural Loads (load placement) Center Load Off-center Load 9

Virtual Bridge Designer: http: //www. jhu. edu/~virtlab/bridge/truss. htm West Point Bridge Design Contest: http: //bridgecontest. usma. edu/ 10

Winning Bridges from 2006 -07 State: 11

Bridges from 2007 -08 State: 12

Bridges from 2008 -09 State: 13

Specifications for 2013 -14: 14

Half-size Sketch for 2013 -14: 15

Full-size Drawing for 2013 -14: 16

Design Example: Truss-Arch; 100 mm tall 17

Design Example: Simple Truss— 100 mm tall 18

Design Example: 150 mm tall Hybrid 19

Building a Bridge: Gather Materials

Tape Drawing to Box

Cover with Wax Paper

Cut sticks per drawing

Pin 1 st layer of sticks

Glue next layer of sticks

Use pins to clamp sticks… Lap Joints much stronger

Carefully Position Each Side

Attach Sides to Angles

Glue Cross Members Top and Bottom

Simple Bridge Testing System

New Bridge Testing System