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Practical Engineering
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Sometimes conventional reinforcement isn't enough. The basics of prestressed concrete. Prestressing reinforcement doesn't necessarily make concrete stronger. But, it does increase the serviceability of concrete members by reducing the amount of deflection under load. This video explains the two most common types of prestressed concrete: pre-tensioned and post-tensioned. Prestressed concrete is used in all kinds of structures from bridges to buildings to silos and tanks. It’s a great way to minimize cracking and take fuller advantage of the incredible strength of reinforced concrete.
- Subjects:
- Building and Real Estate
- Keywords:
- Prestressed concrete Reinforced concrete
- Resource Type:
- Video
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Video
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
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Video
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
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Video
This video shows a demonstration and brief explanation of air lock in fluid pipelines. If you assume that gasses don’t get into pipes or that they can’t constrict the flow, you might design a pipeline that doesn’t work. Luckily for engineers, this is a well-known phenomenon in pipe systems. It’s just one of the complexities that come with the job and we’ve come up a with a lot of creative ways to overcome it.
- Subjects:
- Building Services Engineering and Building and Real Estate
- Keywords:
- Fluid dynamics Pipelines
- Resource Type:
- Video
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Video
In general, and compared to other common building materials, metals have excellent mechanical properties. They are hard, tough, strong, and durable. As someone who occasionally works the wood, even I can admit that metals are a superior material in many regards. So you can see why it would be advantageous to have a way to connect them together, especially if you can do it in such a way that joint isn’t the weakest part of your assembly. That’s the goal of welding, and luckily, this is not something reserved for industrial factories and machine shops. From my own experiences so far, welding is something you might be able to do yourself as a hobby. And stay tuned till the end for some tips for getting started.
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Video
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
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Video
Dams serve a wide variety of purposes from hydropower to flood control to storage of water for municipal and industrials uses. But when a dam’s useful purpose fades away, the structure itself still remains. Dams come in all shapes and sizes, but contrary to what you might think, the most dangerous dams are often the smallest, also known as low head dams.
- Subjects:
- Hydraulic Engineering
- Keywords:
- Dam safety Dams Hydraulics
- Resource Type:
- Video
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Video
Almost everyone agrees that flooding is bad. Most years it’s the number one natural disaster in the US by dollars of damage. So being able to characterize flood risks is a crucial job of civil engineers. Engineering hydrology has equal parts statistics and understanding how society treats risks. Water is incredibly important to us, and it shapes almost every facet of our lives, but it’s almost never in the right place at the right time. Sometimes there’s not enough, like in a drought or just an arid region, but we also need to be prepared for the times when there’s too much water, a flood. Rainfall and streamflow have tremendous variability and it’s the engineer’s job to characterize that so that we can make rational and intelligent decisions about how we develop the world around us.
- Subjects:
- Hydraulic Engineering and Disaster Control and Management
- Keywords:
- Floods Hydrology Flood control -- Management
- Resource Type:
- Video
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Video
Dirt is probably the cheapest and simplest construction material out there, but it's not very strong compared to other choices. Luckily geotechnical engineers have developed a way to strengthen earthen materials with almost no additional effort - Mechanically Stabilized Earth (aka MSE or Reinforced Soil).
- Subjects:
- Building and Real Estate
- Keywords:
- Reinforced soils
- Resource Type:
- Video
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Video
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
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