DRILL: list 2 examples of what live loads are in the house below

STRUCTURAL ENGINEERING: forces and structures APPLICATIONS OF TECHNOLOGY

WHAT IS A STRUCTURAL ENGINEER? A Structural Engineer analyzes and designs the gravity support and lateral force resistance of buildings, bridges, and other structures. Create drawings and specifications Perform calculations Review work of other engineers Write reports and evaluations Observe construction sites

Using vocabulary from chapter 21 tell me What happened???

A load is any force that impacts a structural member. WHAT IS A LOAD? A load is any force that impacts a structural member. Live Loads Earthquakes Wind People Furnishings and Equipment Snow & Rain Dead Loads Weight of Structure Weight of permanent building fixtures

WHAT IS A LOAD? Settlement Load Ground pressure Water pressure A load is any force that impacts a structural member. Settlement Load Ground pressure Water pressure Impact Loads Moving Vehicles Equipment Machinery Will all of these loads be applied to a building at once? No. Structural Engineers may be more concerned about earthquake loads in California than in Maryland. Structural Engineers in Maryland must account for snow loads instead.

FORCES A force is any action that maintains or changes the shape or position of a structural member. Compression Tension Gravity

FORCES A force is any action that maintains or changes the shape or position of a structural member. Torsion Moment (Torque) Shear The forces acting on a structural member must be balanced and the members must be able to support all loads applied to them. Unbalanced members may fail and cause injury if these factors are not taken into consideration. M=fd Moment = Force x Distance(Perpendicular)

STRUCTURAL ELEMENTS/MEMBERS A structural element/member is a piece of the building that does work in holding up the structure. Columns and Beams Span: Distance between two structural members Cantilevers

STRUCTURAL ELEMENTS/MEMBERS Trusses

STRUCTURAL ELEMENTS/MEMBERS Arch Dome Vault

Exit ticket Write down each Question and answer in complete sentences What forces are at work in a typical residential building? What structural members are used in typical wall and floor construction? How, why, and where are these structural members used in a building?

NEWTONS LAWS OF MOTION #1- An object at rest, stays at rest unless acted on by an outside force. An object in motion, stays in motion unless acted on by an outside force. #2- The sum of the forces on an object is equal to that object’s mass multiplied by its acceleration. #3- Every action has an equal and opposite reaction.