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What is difference between pre tension and post tension precast girders of bridge?
A simple explanation:
PRE tensioned- cables are tensioned, and the concrete is cast around it. The tensioning is done BEFORE casting the concrete (PRE = before).
POST tensioned- cables are placed inside of ducts or are greased to prevent bonding to the concrete, the concrete is cast around the cables, and then the cables are tensioned after the concrete has reached a desired strength. The tensioning is done AFTER the concrete is cast (POST = after).
In pre-tensioned girders, reinforcement is stressed with the help of a jack before pouring the concrete.
In post-tensioned girders, a duct is inserted into the concrete during the pouring, and after drying of the concrete the tendons or cables are inserted into the duct, and tension is provided from both ends.
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Locations of compression and tension in footing rebars?
Compression and tension occur in opposite side of the footing relative to position. So, at a spread ftg or pile cap, the top reinforcing will be in tension and the bottom compression. At the midspan, between spread ftgs or pile caps, the tension will occur in the bottom and compression in the top. Rebar lap splices usually occur in the compression points, so bottom lap at spread ftgs and top at midspans. Also, details will typical have additional rebar at the points of maximum tension so at the top over supports and bottom at midspans. This though should be confirmed with the Engineer of Record on any project, as assumptions can change project to project. But this is the general concept.
How do you demolish a post tension slab?
you can't
What is the difference Between under reinforced section and over reinforced section?
When the maximum stresses in steel and concrete simultaniously reaches allowable value the section is called balanced section when the %of steel in a section is less than that required for a balanced section it is under reinforced section when the %of steel in a section is more than that required for a balanced section it is over reinforced sectionover reinforcement is as per section design I.e Ast1+Ast2>Ast Ast1+Ast2
What is tension in building?
Wondering if the building project is going to finish on time.
How is snug tight defined for direct tension indicators?
Snug tight for direct tension indicators means tight but not binding. It would be like tightening something with the hand as much as a person can without a wrench.
What is the difference between force and tension?
[object Object]
What is the difference between tension and compression structures?
compression zone is an positive zone,tension zone is an negative zone..
What is the difference between tension pneumothorax and spontaneous pneumothorax?
tracheal deviation
What is the difference between voltage and Celsius?
Voltage measures electrical tension, Celsius measures temperature.
What was the main difference between Khrushchev and Brezhnev?
There was some relaxation of tension and animosity between the two countries, but not really enough to make much of a difference. The Cold War continued.
What is the difference between tension span and attention span?
A tension span is the amount of suppressed temper someone has and an attention span is the amount of concentration one has on a certain subject or activity.
How does the difference between the character's spoken words and internal thoughts affect the story?
It creates dramatic tension.
What is the difference between tension and pressure in physics?
In physics, tension refers to the pulling force applied to an object, often through a rope or cable. Pressure, on the other hand, is the force applied perpendicular to the surface of an object, typically measured as force per unit area. In summary, tension acts along the length of an object, while pressure acts perpendicular to the surface of an object.
What is thermal tension?
Thermal tension occurs when there is a difference in temperature between two adjacent materials or components, causing them to expand or contract at different rates. This difference in expansion and contraction can lead to stress and potential damage within the materials. Managing thermal tension is important in engineering to prevent issues like warping or cracking.
What is the difference between compression and tension?
Compression occurs when an object is squeezed or pressed together, causing it to shorten or compact. Tension, on the other hand, happens when an object is stretched or pulled apart, causing it to elongate or expand. Both compression and tension are types of forces that can act on materials.
How does the difference between the characters spoken words and internal thoughts affects the story?
The difference between a character's spoken words and internal thoughts can create tension and complexity in the story. It allows readers to see the contrast between what a character presents to others and their true feelings or intentions, adding depth to their characterization. This disconnect often reveals inner conflicts, secrets, or personal growth that drive the narrative forward.
What is the difference between surface tension and interfacial tension?
interfacial tensions are similar to surface tensions in which cohesive forces are also involved but the major forces are adhesive forces (tension) between liquid phase of one substance and either solid liquid or gas phase of another substance and interaction occurs at their surfaces
