when to take fixed support and when to take pinned support.

Please someone clarify, when to take fixed support and hinged support. and please tell me what is the difference between both the supports.        

I know that fixed support will have the moment but pinned support doesn't have.

Parents
  • Following lines are being reproduced from SP43 {Handbook on structures with reinforced concrete portal frames (without craned)} for understanding the support conditions at foundation level: -In the case of isolated footing, the idealized support condition for the column can be
    fixed end condition or hinged end condition depending on the soil strata. If the isolated footing is resting on hard rock, it can be assumed as a fixed base because the rock will not deform much to allow the rotation of the foundation, and if it is resting on normal soil, it can be assumed as hinged because due to the compressibility of the soil, the foundation can undergo a rotation relieving off the moment. In the case of the columns supported by a pile foundation, the base of the column should be assumed as fixed.
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  • Following lines are being reproduced from SP43 {Handbook on structures with reinforced concrete portal frames (without craned)} for understanding the support conditions at foundation level: -In the case of isolated footing, the idealized support condition for the column can be
    fixed end condition or hinged end condition depending on the soil strata. If the isolated footing is resting on hard rock, it can be assumed as a fixed base because the rock will not deform much to allow the rotation of the foundation, and if it is resting on normal soil, it can be assumed as hinged because due to the compressibility of the soil, the foundation can undergo a rotation relieving off the moment. In the case of the columns supported by a pile foundation, the base of the column should be assumed as fixed.
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