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Slope Deflection Method

Slope Deflection Method

Introduction of the slope deflection method

  • Presented by Prof. George A. Maney in 1915
  • Suitable for analysis of continuous beam (Statically indeterminate beam)and rigid jointed frame
  • Using this method basic unknowns like slopes and deflection of joints can be calculated
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Steps of slope deflection method

  • Moments at the ends of a member are first written in terms of unknown slopes and deflections of the end joints.
  • Considering joint equilibrium conditions, a set of the equation is formed and simultaneously solve to get unknown slopes and deflections.
  • Then end moments of individual members can be calculated.

Derivation for Slope deflection equation

  • Give AB an intermediate span about a continuous beam subjected to an external weight system.
  • Let ia and ib be the slopes at the ends of A and B.
  • Let δ be the transverse downward deflection of the right end B concerning the left end  A.
  • Let Mab and Mba be the end moments at A and B.
  1. Due to given loadings end moments MFAB or (? ̅??) and MFBA or(? ̅??) develop without end rotations at ends.
  2. In Fig. below Settlement, δ takes place without any rotations at the ends. The end moment developed is 6??δ/?2
  3. Moment M’AB and M’BA give final rotations ia and ib to the beam AB. Where in fig. below Release the fixity at A. Maintain the fixity at B. Apply a moment 4??/? ia at A to produce a slope at A. This will induce a moment 2??/? ia at B.
  4. In fig. Release the fixity at B. Maintain the fixity at A. Apply a moment 4??/? ib at B to produce a slope ib at B. This will induce a moment 2??/? ib at A.

The final moment at the end A

  • MAB= MFAB + 4??/? ia + 2??/? ia – 6??δ/?2
  • MAB= MFAB + ???/? (2ia +ib  -??/? )

A final moment at the end of B

  • MBA= MFBA + 4??/? ib + 2??/? ib – 6??δ/?2
  • MBA= MFBA + ???/? (2ib +ia  -??/? )

Equation 1 and 2 is called slope deflection equation.

Slope Deflection Method

Fortran ~ Bisection Method