This project incorporates elements of the following engineering disciplines:

Transcription

1 EGR 1200/1205

2 This project incorporates elements of the following engineering disciplines: Civil Engineering Mechanical Engineering Electrical Engineering and Computer Programming

3 Smart Structures Sensors allow engineers to better understand real world structural behavior and can be used to ensure that designs function properly. Smart structures utilize remote monitoring of structural behavior by incorporating electronic sensors on existing structures. For example, over 500 sensors on the I-35W St. Anthony Falls bridge monitor: Strain Load distribution Vibrations Temperature Potential for corrosion Overall bridge movement Bridge s security Automatic anti-icing Lighting systems I-35W St. Anthony Falls Bridge

4 Structural Behavior This project is about the ability to design structures and monitor their behavior when subjected to externally applied loads such as: TRAFFIC WIND and WATER SEISMIC

5 Design Design is an iterative process requiring knowledge of materials and mechanics. Concrete, wood, steel, and many other materials are available to the engineer which material is best for a given application? Box beams, I-beams, bar joists, wood joists, concrete girders which shape is the best design for a given application?

6 Structural Element Behavior To understand structural behavior, we will first perform hands on activities to understand a structural element s ability to resist deformation when subject to: Axial loads loads that cause a structural element to elongate (tension) or compress (compression) Flexural loads loads that cause elongation (tension) on one side of the structural element and compression on the other side tension compression tension

7 Structural Element Behavior A structural element s stiffness and strength is related to both it s geometry and its material behavior. We ll also perform hands on activities to understand a material s response under load, and how it relates to the geometry of the structural member. Strain is defined as the change in length, DL, divided by the initial length, L o : ε = DL / L o Stress is defined as a force, F, divided by an area, A σ = P/A And the material stiffness is defined as its Modulus of Elasticity, E E = σ/ε

8 Electronic Sensors Electronic sensors will be used to in the lab to measure structural response. In real world applications, these instruments can be monitored on-site and remotely using data acquisition systems. You ll learn about these types of sensors and systems. Strain gauges Accelerometers Data Acquisition System Linear Potentiometers

9 Instrumentation You will learn how to build and program a working sensor system consisting of single-board microcontrollers and microcontroller kits for building digital devices and interactive objects.

10 Final Project As a final project, teams will: -Design and construct a flexural element (structural beam) to support a load. -Design and build an electronic sensor to monitor the flexural element while it is loaded. -Program the data acquisition system to alert the user when a design limit is reached. Arduino Sensor(s)