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Civil Engineering
Civil Engineering is a profession of designing and executing structural works that serve the general public, like houses, buildings, roads, etc. A Civil Engineer is an engineer trained in the design and construction of public works, such as bridges or dams, and other large facilities.
4,921 Questions
What are superstitions about bridges?
I think there's some weird attachment about bridges within the Legend of Sleepy Hollow, right? Like the Headless Horsemen cannot cross the specific bridge or something right?
Also I think there's something about vampires being unable to cross running water (ie run across a bridge and your safe if the water is running)
Answer- If you say goodbye to a friend on a bridge, you will never see them again.More Information
The superstitions about bridges seem to stem from bridges being symbolic of the "crossing over" from life to death.
It was believed that the "Devil" would claim the soul of the first one to cross a newly constructed bridge. This resulted in an animal being herded across the bridge first.
Many people in Europe will not cross a bridge nor go through a tunnel when a train is passing above or below them.
Many people will not cross a bridge behind a coffin or hearse.
Bridge builders have been know to add wine, a coin or a bit of iron to the mortar used in placing the keystone to ensure the future good fortune of the bridge.
What are the Stress-strain characteristics of ductile materials?
initially there is the linear elastic region which obeys the hooks law :stress is directly proportional to the strain.
at the end of the linear elastic region the ductile material reaches the yield point beyond which any change in dimensions become permanent. the material goes through a yield plateau in which stress is constant and the strain changes.
after crossing the yield plateau the ductile material goes through the strain hardening region in which the deformation is permanent but as the region goes on the stress increases with the strain. here the strength of the ductile material increases as it is strain hardened. at a point it reaches the ultimate load point. This is the maximum load taken by the material. after which further deformation causes decrease in strength or the stress goes on decreasing finally breaking at the breaking load point. this region is called the post-ultimate region.
Is it more expensive to order prefabricated trusses and get a crane or build the trusses on site?
prefabricated trusses and typically less expensive when they are fabricated for repetitive use in housing project with similarly designed roofs. If the roof is a standard Gable this helps in cost reduction. A Hip roof or a roof with numerous offsets with try or coffered ceilings it is more cost effective to stick frame or conventionally frame this roof. (answered by a framing contractor of 33 years)
How do you design a piling wall reinforced concrete type retaining wall to hold soil?
First off- account for drainage. I worked on a crew adding re-bar-reinforced concrete pilings to a concrete retaining wall in an Atlanta neighborhood filled with million dollar homes. The soil went right up against the retaining wall without any rock or other aggregate to help drain away any rainfall. We had to come in and drill a series of forty foot holes with about a foot diameter at an angle of 30 below horizontal. We then inserted threaded re-bar to the bottom of each hole and filled with concrete until it overflowed. After the concrete would set, we used a hydraulic jack and nut and pulled the re-bar tight against an iron plate on the outside of the wall; alternating tightening the nut, extending the jack, tightening the nut, and so on. Then we filled the holes to the top with more concrete.
Lesson- build it right the first time or it's going to be a pain in the rear later on.
Account for the type of soil and how it drains/retains water in order to determine the proper method and amount of aggregate necessary for the wall in question.
Then, depending on the size of the wall, use a re-bar reinforcement grid as a skeleton. Reference a structural engineering manual for the needed qualities.
Why the partial safety factor of concrete is higher than that for steel?
because concrete is unpredictable than steel
How deep is the frost line is Rapid City SD?
i dont know whho cares
Most concrete foundations are buried 4' to get below the frost line which is around 3'.
Why is the Mackinac Bridge the biggest bridge in the world?
Sorry- it is about #12 on the list of the biggest bridges- depending on how you define biggest. See link below for list of BIG bridges.
Brick can be cut with a water cooled saw, they can usually be rented from a rental shop or builder's supply store. Most mason's are good enough with a mason's hammer to split a brick to the appropriate size for laying brick on the side of a building. With a brick cutter.
What happened to the ultimate tensile and yield strength of most of the metals when temp falls?
building will collapse due to steel failure
A cantilever beam is a structural element that is fixed at one end and free at the other, allowing it to extend horizontally without additional support. This design enables the beam to carry loads applied to the free end, distributing stress and deflection along its length. Commonly used in bridges, buildings, and overhangs, cantilever beams are essential in engineering due to their efficiency in supporting loads while minimizing material use. The fixed end must be robust enough to withstand the bending moments created by the applied loads.
How much will it cost for raw materials of a causeway bridge?
It depends on the specifications required. No monatery value can be given without further details.
What are the factors which creates camber in thin slab caster?
Uneven spray cooling, not correct segment gap preparatio
It's a symmetrical sloping flat surface at a 90 degree edge or corner.
