Typically there are no restrictions on the location of fences at residential locations. Most cities, or other jurisdictions, are more concerned about the height and materials the fence is composed of (if it is over 6′ and how flammable it may be).
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Why are some concrete posts of elevated rail systems not aligned at the center of the girder which will hold the 2 rails of the train?
Trains have very specific requirements for how much they can rise/fall or turn. As such, the available locations to place a support can easily not line up with the track. So they place the support as near as possible and provide a secondary member to support the rails. You often see this with freeway interchanges …
In flexural design for concrete, is steel reinforcement required? Why?
Strictly speaking, no. Without reinforcement, steel or otherwise, you are looking at gravity structures that mostly rely on compressive strength. Any modern application of concrete pretty much calls for reinforcement. In different terms, once your concrete object (this is a solid concrete object) gets a dimension that is around three times more than the shortest, …
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Say I’m in a fair-sized city. How far down would I have to dig to no longer be in that city?
Legally, you’re still in the city at any depth this side of the center of earth. If you’re looking for undisturbed soil: Suburban – houses: 5′. Suburban – streets: 20′ in most cases, but at low as 60′ for large deep utilities. Suburban – commercial buildings: 20′ in most cases, but as low as 40′. …
How many circular steps are needed for a 10 ft height?
First, we would need to know if you are talking about a circular or spiral staircase. Circular stair curve gradually and spirals are a tight space. Given the question, you haven’t designed stairs before. If you are thinking about a spiral stair just go with a pre-manufactured solution. Things can change with the width and …
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What is the minimum thickness of a wall in stone masonry?
It is generally considered to be 6″. You can get thinner but stone size, shape orientation, and reinforcement quickly become predominant issues. In other words, the wall starts behaving more like concrete bellow 6″ in thickness and like a shell structure below 4″ in thickness. Keep in mind when I say they behave in a …
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What do you call the property of a material to deform strongly plastically under overload?
I think you’re looking for the “modulus of elasticity”.
Can buildings be built using Tensegrity, such as skyscrapers?
Yes, but… If you look at most examples you will notice strictly a framework. A few examples will suspend a bridge or solid form using it or them, as a compression strut. So you become limited to structures so big the occupied portions look like the struts or a large mass supported by a couple …
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If you dug a tunnel from one place on Earth to its antipode, how long would it take you to walk that tunnel at an average walking speed?
Ok. Earth is between 7,899.8 (pole to pole) to 7,926.4 (equator through the center to equator) miles. People comfortably walk at about 3mph. This gets you between 2,633 to 2,642 hours. That would be basically 110 days or just less than 4 months. Of course, this assumes you never stopped walking and kept at the …
How much weight can a 4-thick concrete slab withstand?
Typically we like to limit the weight to about 40 lb/sqft on an unknown 4″ slab. In most cases you can go to 80 lb/sqft in isolated spots, but unless you know roughly what the soil bearing and reinforcing is for that slab you might be looking at cracking. Keep in mind that 40lb/sqft is …
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