SA38: Exercise Problem 2

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  1. Dr. Structure
  2. moment distribution method
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Комментарии
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Hi, if there were more than 2 segments and more than 3 points, do we do them 2 segment at a time (?)

VocaFanever
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There's a problem in this question. The joint moment 16 (clockwise) has been taken positive in the table. Then the fixed end moment at B, which is anticlockwise should be taken as negative but is taken here as positive. Similarly, the clockwise fixed end moment of 6 at joint C should be positive but is taken as negative. Hence, there is a contradiction in the sign convention taken, leading to different answer. Please help and reply soon!

Katharsisistic
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Dr structures, why did we ignore the overhang portion of the beam in the beginning to solve the problem? Should we not take into account of its stiffness coefficient?

raheelmalook
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Dr Structure, I have an example here from (Structural Analysis ) Textbook by hibbeler . Its a continuous beam ABCD Supports from left to right, Fixed, pin, pin, fixed with span lengths 12, 12, 8 respectively; Loads: distributed downward 20 kn/m at midspan (BC) and downward point load at mid point of third span (CD). The signs of FEM of third span contradict the sign of FEM of (BC) in this example?!! Aren't both cases similer to each other ( the example above and the one I just posted) ? Regards

ammaral-salami
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Dr structures, when do we use stiffness coefficient of 3/4 EI/L? I
have seen such problems in my text book which have been solved by using this value of stiffness coefficient.

raheelmalook