Presentation on theme: "April 22, 2010 DRILL What is structural technology?"— Presentation transcript:
1April 22, 2010 DRILL What is structural technology? U3i - L1April 22, 2010DRILLWhat is structural technology?What comes to mind when you hear the word “structure”?
2Structural Technology U3i - L1Structural TechnologyThe technology of putting mechanical parts and materials together to create supports, containers, shelters, connectors, and functional shapes.Example applications:Legs on a chair,City water tower,Swimming pool,Roadways and Bridges,Bicycle spokesAirplane wing,Satellite antenna disc.
3UNIT 3 – Engineering Design U3i - L1UNIT 3 – Engineering DesignEngineering, the systematic application of mathematical, scientific, and technical principles, produces tangible end products that meet our needs and desires.
4UNIT 3 – Engineering Design U3i - L1UNIT 3 – Engineering DesignGetting familiar with the Big IdeaThe Design ProcessCore TechnologiesMechanical TechnologyElectrical TechnologyFluid TechnologyThermal TechnologyOptical TechnologyMaterials TechnologyBiotechnologyStructural Technology
5Structural Technology U3i - L1Structural TechnologyPURPOSE OF SUB-UNITTo familiarize students with the functioning and applications of structural technology systems.
6Technology What is technology? U3i - L1TechnologyWhat is technology?The application of knowledge, tools, and skills to solve problems and extend human capabilities.What is a technology system?A Technology System is a group of subsystems working together to solve problems and extend human capabilities.
7Structural Technology U3i - L1Structural TechnologyThe “building blocks” of all technology systemsCORE TECHNOLOGIESCore TechnologiesMechanicalStructuralElectricalElectronicThermalFluidOpticalBio-TechMaterial
8Structural Technology U3i - L1Structural TechnologyStructural engineers are responsible for structural integrity.Structural failures do not occur very often, but when they do, we hear about it:Tacoma Narrows bridge (1940)Challenger Space Shuttle (1986)Columbia Space Shuttle (2003)Chernobyl Nuclear Reactor (1986)2007 Missouri bridge collapseAs late as 1870’s and 1880’s, 25 bridges a year collapsed on the American roadways.Many people can be killed when engineered structures fail.
9Structural Technology U3i - L1Structural TechnologyAlmost everything is a structure of some kind:HumansPlantsAnimalsHousesVehiclesTablesBottles
10The “First Modern Engineer” U3i - L1The “First Modern Engineer”Galileo Galilei (1564 – 1642)The “Father of Modern Physics”The “Father of Modern Science”Research into the strengths of materialsPrior to Galileo, the size and shape of most structures was determined by the traditions and rules of highly skilled craftsmen.
11Structural Technology U3i - L1Structural TechnologyStructural designs advanced by trial and error until modern engineers were able to anticipate the characteristics of new buildings, bridges, and other structures.Engineers apply science and mathematics to the problem of designing safe structures.Many engineering principles are based on common sense.
12Structural Technology U3i - L1Structural TechnologyNewton’s 3 Laws of Motion:Inertia: objects at rest stay at rest;objects in motion stay in motionF = maAction/Reaction: for every action there is an equal and opposite reaction
13Structural Technology U3i - L1Structural TechnologyAnother way to look at it:How much do you weigh?You are pushing down on the earth that amount of force.The earth is pushing up on you with an equal amount.What would happen if the earth were pushing up with more force?Less force?
14U3i - L1Strength of MaterialsStrength of a construction material is the capacity to support loads by resisting the 4 structural forces.Strength depends on materials’:TypeSizeShapePlacement
15U3i - L1Structural ForcesFour types of force exert stress on building materials:Compression – push; tends to flatten/buckleTension – pull; tends to stretchShear – slide; material fracturesTorsion – twist; twist out of shape or fracture
21Strength of Materials Is bending one of the structural forces? U3i - L1Strength of MaterialsIs bending one of the structural forces?Deflection – bending that results from both tension and compression acting on a member at the same time.VerticalHorizontalCOMPRESSIONTENSIONCOMPRESSIONTENSION
23The total weight or mass of all live and dead loads is the Total Load. U3i - L1Structural ForcesA structure must contend with two types of loads:Dead Loads: permanent loads that do not change.The weight of building materials and permanently installed components:Lumber, brick, glass, nails, steel beams, concreteLive Loads: the weight of all moveable objects, such as people and furniture in a house, vehicles on a bridge.Includes weight of snow, ice, dead leaves, and force of winds.The total weight or mass of all live and dead loads is the Total Load.
24U3i - L1Structural ForcesA building supports the following loads in the middle of winter:10,000 lbs of lumber1000 lbs. of snow and ice40,000 lbs of brick300 lbs of wind600 lbs of glass200 lbs of nailsCalculate the Live Load.Calculate the Dead Load.Live Load:1000 lbs.+ 300 lbs.1,300 lbs.Dead Load:10,000 lbs.40,000 lbs.600 lbs.+ 200 lbs.50,800 lbs.
25Structural Forces Live Load = 1,300 lbs. Dead Load = 50,800 lbs. U3i - L1Structural ForcesLive Load = 1,300 lbs.Dead Load = 50,800 lbs.Calculate the Total Load:Total Load = Live + Dead Load= 1,300 lbs. + 50,800 lbs.Total Load = 52,100 lbs.
26Work on your Research Project U3i - L1Work on your Research ProjectRough draft sketch of poster and information due Thursday