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  • Why Triangles

    maria flor

    maria flor

    @maria-flor-8cAkif
    Updated: Mar 18, 2011
    Views: 1.5K
    Why triangles not squares,rectangles or other geometric shapes are the strongest.
    The shape is commonly used to supports, trusses, etc. in buildings, but why triangle???
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Replies

  • CIVILPRINCESS

    Member • Mar 18, 2011

    i think it is so because triangle is the simplest structure and also is the strongest. i mean when a triangle is deformed it does so only by failure of a joint or lengthening of one side. in case of a rectangle it can fail by just changing the angles between its members. it is hence highly unstable. we can strengthen this rectangle by adding a single member connecting the opposite corners of a diagonal thus making it into two triangles.

    am i right?
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  • ISHAN TOPRE

    Member • Mar 18, 2011

    I think that a triangle has a flat base and two inclined sides. The top vertex when loaded, the load can be distributed in both horizontal and vertical directions.
    Where as a rectangle or square, has a direct and full impact of load, only on one side. Due to such high stress concentration on a single direction the square or rectangle break easily.

    I think that is the reason!
    What say people?
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  • maria flor

    Member • Mar 18, 2011

    Hey guys Check this out: <a href="https://www.pbs.org/wgbh/buildingbig/lab/shapes.html" target="_blank" rel="nofollow noopener noreferrer">BUILDING BIG: Shapes Lab</a>
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  • Ramani Aswath

    Member • Apr 3, 2011

    Because triangle is the only polygon that cannot be distorted. Three points completely define a plane.
    #-Link-Snipped-#
    #-Link-Snipped-#
    Bioramani
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  • akshay rathore

    Member • Mar 9, 2013

    But then why most of the bridge piers are rectangle , square , circular shaped ?........why can't they be triangular shaped ? which brings me to another doubt , why is not there A TRIANGULAR STIRRUP/TIE ? , why is there only rectangular 2/3/4- legged stirrups ?
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  • @n@nd

    Member • Jul 2, 2013

    if the stirrups have to be triangular, then the beams cant be rectagular or square.. even in a singly reinforced beam we give rods wer its not necessary too... for the stirrups to be stable... for a fixed beam der is no bending moment at d corners(supports). and for the negative B.M. it undergoes(sagging) we lay bottom rods. but just for the support we also provide a minimum of 2- 10 or 12 mm rods as top rods.. and stirrups to hold them. if they r triangle, then i think it ll lead to less percentage of steel ratio with concrete in d gross area.. i think 0.8 to 1% of steel in gross area.. not sure,,and i get a tot here... stirrups are shear rods ryt? is der possibility to link with shear plane here?
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  • Marvin Kalngan

    Member • Jul 31, 2013

    how about if we a try a circular in shape??
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  • Anand Tamariya

    Member • Jul 31, 2013

    marvin cute
    how about if we a try a circular in shape??
    Circular shape is costly to manufacture and triangle is cheapest - which serves the purpose.
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  • Marvin Kalngan

    Member • Jul 31, 2013

    Circular shape is costly to manufacture and triangle is cheapest - which serves the purpose.
    Circular shape is costly but view is very good.
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  • Anil Jain

    Member • Jul 31, 2013

    marvin cute
    Circular shape is costly but view is very good.
    Circular shape is costly to manufacture and triangle is cheapest - which serves the purpose.
    Circular shape structures are not very strong due to un-balanced forces (lots of efforts and money is invested to make that stable, that's why they are costly) and other aspect from designing.

    -CB
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  • Jeffrey Arulraj

    Member • Aug 1, 2013

    Balancing a structure is the prime concern given into while constructing a massive structure

    The wider the base the better The narrower the top even the more better That makes Trapezium and triangular design work marvels

    But Why triangle easy construction no special equipment and other considerations to be made here
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  • Marvin Kalngan

    Member • Aug 3, 2013

    circular is better than triangular
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  • Kaustubh Katdare

    Administrator • Aug 3, 2013

    marvin cute
    circular is better than triangular
    Maybe you should add some explanation 😀
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  • Sarathkumar Chandrasekaran

    Member • Aug 9, 2013

    marvin cute
    circular is better than triangular
    I dont think so.there are many type of sections such as triangular,circular,c shaped u shaped and each type serves its own purpose.In buildings,each section has its own advantage and helps in distribution of load .different types of sections have been used for cantilever,simply supported,continuously supported beams.
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