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Bridges and Tunnels
A bridge is a link between two places, such as over a river, a road or a depression, that caters to pedestrians and/or vehicles. A tunnel is an underground link between two places, often underneath a riverbed, for pedestrians and/or vehicles.
4,393 Questions
What bridge can hold the most weight?
Tires with a 'Load Index' rating of 119 can carry 3,000 pounds each. This is the last set of numbers in your tire designation
I believe a bridge should be considered a simple machine. It saves work and gives mechanical advantage. It can also shorten distance, so unlike an inclined plane it can benefit without increasing distance. It can bypass the need to raise and lower massess into crevasses, it can bypass long journeys down then back up a hill. I could find no discussion anywhere.
A bridge is made of what metal?
The material of choice is stainless steel, because of its cost, abundance, strength, and reliability.
Is an arch bridge stronger than a suspension bridge?
Yes. An arch bridge is one of the more efficient ways of building and maintaining a bridge. Beam bridges are not as efficient. For a given span and height, an arch bridge will carry a greater load using less material. The beam structures of a beam bridge can be constructed of wood, reinforced concrete or steel (in increasing order of strength). The beams, however, must be supported by piers or an abutment at each end, which can be made out of concrete, masonry, stone, or steel (or combination thereof). The arch structure of an arch bridge can be constructed of wood, reinforced concrete, steel, or masonry, and the arch can be supported by abutments as described above, or the arch can extended down to the foundation itself. The primary advantage of an arch is that stresses caused by the load on the bridge are converted primarily into compressive stresses that are carried along the arch into the ground. Materials like stone, masonry and concrete are particularly good at carrying these compressive stresses. In contrast, loads on a typical beam-type bridge creates large tensile stresses on the bottom of the beams. Since stone, masonry and unreinforced concrete have very little capacity to withstand tension, none of these materials can be used to make a reliable and efficient beam-type bridge of any significant span.
Who designed the first truss bridge?
the first Truss bridge was built by Palmer in 1811 in Philidelphia
Which is stronger a plank bridge or a arch bridge?
An arch bridge. I think that may have been discovered quite some time ago !!!
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It was - the Romans used arches extensively, in buildings as a well as for bridges. However, the arch is indeed stronger than the plank, or simple beam, bridge because it transmits the loads to its abutments. You can stiffen a beam bridge by fitting it with vertical side-members, or in larger structures, frames (trusses).
Bleeding in concrete is sometimes referred as water gain. It is a particular form of segregation, in which some of the water from the concrete comes out to the surface of the concrete, being of the lowest specific gravity among all the ingredients of concrete. Bleeding is predominantly observed in a highly wet mix, badly proportioned and insufficiently mixed concrete. In thin members like roof slab or road slabs and when concrete is placed in sunny weather show excessive bleeding.
Due to bleeding, water comes up and accumulates at the surface. Sometimes, along with this water, certain quantity of cement also comes to the surface. When the surface is worked up with the trowel, the aggregate goes down and the cement and water come up to the top surface. This formation of cement paste at the surface is known as "Laitance". In such a case, the top surface of slabs and pavements will not have good wearing quality. This laitance formed on roads produces dust in summer and mud in rainy season.
What is done to stop bridges from rusting?
Metal comes in contact with oxygen. That's the main reason that many mechanics wipe down their older metal tools with oil (WD-40). The coat of oil prevents air from contacting the metal. That's why they spend much more than $100,000 to paint a bridge. The coat of paint saves them. H2O, water, has the same effect on metal.
Which are seminar topics in water resources engineering?
Seminar Topic in Structural Engineering are as under.
1. Fibre Reinforced Cements and Concretes: Recent Developments.
2. Techniques for the Seismic Rehabilitation of Existing Structures.
3. Seismic Assessment and Upgrading of Existing Structures.
4. Role of Building Codes in Seismic Assessment.
5.Seismic Retrofitting of RC Buildings Using Traditional Techniques.
6. Recent Advances in Seismic Retrofitting of RC Frames.
7. Smart Material and Smart Structures.
8. Deep Foundations Case Histories: Innovations in Design, Methods and Equipment.
* Revised, improved and consistent notations throughout code * Effect of multiple edges on anchor capacity * Design of post-installed anchors used in cracked and uncracked concrete * Unified design provisions for reinforced and prestressed concrete flexural and compression members * Shear reinforcement at slab-column connections of slabs that are not part of the lateral-force-resisting system of a building in a high seismic design category * Development length requirements in seismic force-resisting members * Application of unified crack control criteria to flexural tension reinforcement as well as skin reinforcement in deep beams * Alternate torsion design procedure for L-shaped solid beams that have a large height-to-width ratio Also covered in this seminar are the following topics: * Adjustment of allowable tension reinforcement stresses for crack control * Shear in precast, prestressed concrete hollow-core units * Drop panels for enhanced punching shear resistance, or for reduction of the amount of negative reinforcement over a column or to satisfyminimum required slab thickness * Modified strength reduction factor for flexural sections within the development length of pretensioned members * Spiral reinforcement with yield strength up to 100,000 psi * Construction joint locations in continuous post-tensioned beams and slabs * Clarification of design procedure for pile caps * Reduced maximum allowable tensile stresses in the concrete of post-tensioned slabs * Documents applicable to non-structural, soil-supported slabs
Can you give us some idea of the size of bridge you're referring to? Firstly, how long is it? If it's a suspension bridge do you include all the shore anchorages in the weight? What is it made from - stone, brick, steel, wood, for example? Is the whole of the bridge made from the same thing? What sort of load is it meant to carry?
What is the minimum anchorage length on re-bars in concrete cantilever beams?
you can generally use 180 degree hooks, to provide enough anchorage in slabs with no edge beams. use the Ldh formula (12.5.2) of ACI 318-11
What are the benefits of bridges?
Tolls provide money for the government.
Bridge's also provide a passageway for transportations including automobiles, ferries, ships, and trains.
Efficient means of transportation vs taking a ship to the desired location.
Links to area's together.
Transportation time is much faster, and price of a toll is much less then a boat ticket.
What materials go into building a bridge?
Bridges are very complex structures that must be carefully engineered using long-lasting and strong materials. Some of the materials that are used for bridge building includes stones, cement, steel, wood, and composites.
What water does the largest bridge span?
I assume that you want the longest.
This is the Bang Na Expressway and it goes over land. It is not always on the list of bridges because it does not cross water. It has two tolls booths on it and covers 33.5 miles
The longest bridge over water is over Lake Pontchartrain. This causeway was a surprise to me when I first crossed it. I was almost out of fuel when I entered the bridge the first time. I learn quickly though! It covers roughly 24 miles. Not a great feeling on empty! (I made it!)
The largest suspension bridge is Akashi-Kaikyō Bridge in Japan. It crosses the strait of Akashi.
What is the minimum and maximum allowable percentage of reinforcement steel in concrete?
The amount of steel required in concrete as reinforcement is measured using a formula that calculates the amount of pressure that will be put on the concrete. There are different formulas to identify the minimum and the maximum amount of needed steel, depending on if you are making a beam, slab, or column.
Why is the warren truss bridge so strong?
- It involves a configuration the combines strength and productivity. The designing uses SAE steel grades (essentially an amalgamation of carbon and alloy steels) which renders the framework strong yet complex. It ensures that any beam, strut or tie ends only undergo tensional or compressional forces.
What devices are connected to the north bridge and south bridge?
They are the one who sends data to the processor...
The north bridge also the who controls video card,expansion cards or graphics cards and south bridge controls the drives and onboard devices.
What do you mean by M20 concrete?
In this M refer to Maximum compressive strength and 20 refer that concrete that with stand upto 20KN compressive strength.
Can you reuse the cement after it has crossed its setting time?
yes, if it is before the initial setting time...
Can you give you some different names for college symposium for civil department?
istanbul efendisi - civil magistrate
Would engineered fill improve the Safe bearing capacity of soil?
Yes, it can improve the bearing capacity but the extent has to be seen with other conditions like soil, mode of filling, treatment given. In fact this was done in delhi to counter site conditions.
What are some main disadvantages to nitrogen?
There are some disadvantages to nitrogen, especially in inflation. Two disadvantages include the expense of nitrogen, and the fact that more tire maintenance will be needed if nitrogen is used.
Is a bridge a mode of transportation?
A lot of stuff! You know.... like things! GO BRIDGES FOR CARRYING STUFF! (and things!)
