Theory of Beam Columns: In-Plane Behavior and Design, Volume 1

3.4: GENERAL SOLUTION OF ELASTIC BEAM-COLUMN (DEFLECTION PROBLEM)

3.4 GENERAL SOLUTION OF ELASTIC BEAM-COLUMN (DEFLECTION PROBLEM)

Consider a member which is subjected to a thrust P, end moments M A and M B, and partly distributed uniform load q within x 1 ? x ? x 2 as shown in Fig. 3.11. The governing equations for this elastic beam-column problem are given in the three portions separately.

(3.46)

Figure 3.11: General beam-column

where the subscripts 1, 2 and 3 indicate the three portions. The general solutions are obtained in the following forms:

(3.47)

where f i( x) are particular solutions of the above differential equations and

(3.48)

The twelve integration constants A i, B i, C i, D i are solved from the following twelve boundary conditions:

(3.49)

The constants are solved from the twelve simultaneous equations (3.51) in next page.

(3.50)
(3.51)

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