Prestressed Concrete

       Prestressed Concrete

  - prestressing can be defined as the application of a predetermined force.

  - In prestressed concrete section is in compression , so it is free from tensile cracks.

  - it is used in bridges and large span roofs.

  - It's disadvantage is its labour cost may be higher..

   - In prestressed concrete steel is used to apply force of prestress..

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Earthquake and plate tectonics

        Earthquake and plate tectonics

 As you are aware of the axial rotation of the earth but you cant feel it. 
Same way there are plates in earth crust and they continuously moving but we cant feel it.
They are moving too slowly but their contribution in geography of earth is very high as earthquakes and volcanoes are due to it.

                                       


The Earth’s crust is divided into 12 major plates which are moved in various directions.
This plate motion causes them to collide, pull apart, or scrape against each other.
Each type of interaction causes a characteristic set of Earth structures or “tectonic” features.
The word, tectonic, refers to the deformation of the crust as a consequence of plate interaction.                 

      

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Worlds longest bridge

                   Worlds Longest Bridge
    - Danyang-Kunshan Grand Bridge

      
 * This is worlds longest bridge.
*  It is a 164.8 km long bridge in china.
* Construction was started in 2006.
* Opened date is June 30,2011.
*Bridge type is Viaduct



 Once again china proved their best try.

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Types of rocks ..

                     Types of rocks .

 1 - sedimentary

 * sedimentary rocks formed from particles of sand,pebbles and other fragments of material.
example:limestone
 






2 -Igneous

 * Due to volcanoes. it called lava.
    examples : basalt and obsidian.
when lava cools quickly its formed into rocks.

 

 3 Metamorphic
   * metamorphic rocks formed under the earth surface of the earth . due to intense of heat and pressure.
 example: Marbles.

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Top Three Tallest Structure

            Top Three Tallest Structure

(1) Burj khalifa
     its address is 1  Sheikh Mohammed bin Rashid Blvd - Dubai - United Arab Emirates

       Height : 828 m
    
       floors:  163
     
      Opened by:   
    
   January 4, 2010

     





  (2) Tokyo SkyTree


  Adress:1-1-2 Oshiage, Sumida, Tokyo 131-0045, Japan


  Height:  634 m

  Floor : 29


  opened:May 22, 2012













  (3) Kvly-tv mast North Dakota
     
     address: traill country CTBUH

     Height : 629 m
     
     opened: Auguest 13 1963
     

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