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  • Video 
    How to Collapse a Pipe by Closing a Valve

    How to Collapse a Pipe by Closing a Valve

    Water hammer can work in both directions, and I only discussed one of those in the previous video (https://youtu.be/xoLmVFAFjn4). This episode revisits that demonstration to show how water hammer can form a vacuum pressure in a pipe. Momentum carrying fluid away from a valve wants to keep going even after the valve is closed. This generates a negative pressure than can cause major damage!

    Subjects:
    Building Services Engineering
    Keywords:
    Valves Water hammer Hydraulic control Hydraulic transients Relief valves Fluid mechanics
    Resource Type:
    Video
     
  • Video 
    What is Water Hammer?

    What is Water Hammer?

    Hydraulic transients (also known as water hammer) can seem innocuous in a residential setting, but these spikes in pressure can cause major damage to large pipelines and industrial pipe networks. In this video, we briefly discuss how water hammer occurs and how engineers mitigate the effect.

    Subjects:
    Building Services Engineering
    Keywords:
    Water hammer Hydraulic transients Fluid mechanics
    Resource Type:
    Video
     
  • Video 
    Why Bridges Move...

    Why Bridges Move...

    This video explains why ridges move, and other musings on thermal movement of large civil works. Most people have a certain intuition about thermal expansion, but you may not have considered how engineers design to accommodate it on large civil structures. The video gives a quick overview on this important consideration that engineers must account for when designing infrastructure like pipelines, bridges, and even sidewalks.

    Subjects:
    Structural Engineering
    Keywords:
    Structural analysis (Engineering) Expansion (Heat)
    Resource Type:
    Video
     
  • Video 
    What is Cavitation?

    What is Cavitation?

    This video shows the basics of fluid cavitation, including demonstration from AvE. If you subject a fluid to a sudden change in pressure, some interesting things can happen. You can cause tremendous damage to moving parts, or you can harness this destructive power in many beneficial ways.

    Keywords:
    Hydrodynamics Cavitation Fluid mechanics
    Resource Type:
    Video
     
  • Video 
    Why Tunnels Don't Collapse

    Why Tunnels Don't Collapse

    This video shows how simple reinforcement is used to prevent collapse of rock tunnels. Tunnels play an important role in our constructed environment as passageways for mines, conveyance for utilities, and routes for transportation. Rock bolts are a type of reinforcement for stabilizing rock excavations, usually made from steel bars or bolts. This simple construction method dramatically reduces the cost of making tunnels through rock safe from collapse.

    Subjects:
    Structural Engineering
    Keywords:
    Underground construction Rock bolts Tunneling Tunnels
    Resource Type:
    Video
     
  • Video 
    Why the Tacoma Narrows Bridge Collapsed

    Why the Tacoma Narrows Bridge Collapsed

    Wind can be one of the most critical and complicated loads on civil structures. The case of the Tacoma Narrows bridge is a well-known cautionary tale that’s discussed in engineering and physics classrooms across the world. Both resonance from vortex shedding and aeroelastic flutter contributed to the failure. When you push the envelope, you have to be vigilant because things that didn’t matter before start to become important (e.g. wind loads on lighter structures). Unanticipated challenges are a cost of innovation and that’s something that we can all keep in mind.

    Subjects:
    Structural Engineering
    Keywords:
    Washington (State) -- Tacoma -- Tacoma Narrows Bridge (1940) Suspension bridges Wind-pressure
    Resource Type:
    Video
     
  • Video 
    What is Concrete?

    What is Concrete?

    What's the difference between concrete and cement? Concrete is the most important construction material on earth and foundation of our modern society. At first glance it seems rudimentary, but there is a tremendous amount of complexity involved in every part of designing and placing concrete. This video is meant to be a bare-bones introduction to the topic, with a cool demonstration of concrete strength using a hydraulic press.

    Subjects:
    Building and Real Estate
    Keywords:
    Concrete Cement
    Resource Type:
    Video
     
  • Video 
    Why Concrete Needs Reinforcement

    Why Concrete Needs Reinforcement

    This video shows more destructive testing to answer your questions about concrete. Concrete's greatest weakness is its tensile strength, which can be less than 10% of its compressive strength. So, we often reinforce it to create a composite material strong against all types of stress. This video briefly touches on conventional rebar and prestressed/post-tensioned reinforcement.

    Subjects:
    Building and Real Estate
    Keywords:
    Reinforced concrete Concrete
    Resource Type:
    Video
     
  • Video 
    Does Rebar Rust?

    Does Rebar Rust?

    While steel reinforcement solves one of concrete’s greatest limitations, it creates an entirely new problem: Corrosion of embedded steel rebar is the most common form of concrete deterioration. There are lots of ways to combat this problem, a few of which we discuss/demonstrate in this video, including fiber reinforced concrete, adequate protective cover, and fiber reinforced polymer bars.

    Subjects:
    Building and Real Estate
    Keywords:
    Protective coatings Reinforced concrete -- Corrosion -- Prevention Reinforcing bars -- Corrosion Fiber-reinforced concrete
    Resource Type:
    Video
     
  • Video 
    Was Roman Concrete Better?

    Was Roman Concrete Better?

    This video discusses a few modern techniques that help improve design life of concrete, including roller compacted concrete (RCC) and water reducing admixtures (superplasticizers). There are a whole host of differences between modern concrete and that of the western Roman empire that I didn’t have time to go into, including freeze/thaw damage.

    Subjects:
    Building and Real Estate
    Keywords:
    Concrete construction Roller compacted concrete Concrete -- Additives Concrete
    Resource Type:
    Video