Displacement Methods of Analysis - Examples & Applications

  1. Slope-Deflection Example

Example

Analyze a continuous beam ABC. Span AB is 6 m6\text{ m} long with a point load of 30 kN30\text{ kN} at midspan. Span BC is 4 m4\text{ m} long with no load. The beam is fixed at A, has a roller at B, and a roller at C. Constant EIEI.

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Example

A continuous beam has two spans: AB (L1=4 mL_1 = 4\text{ m}) and BC (L2=6 mL_2 = 6\text{ m}). The beam is fixed at A and C, and continuous over a roller support at B. Both spans have the same EIEI. Span AB carries a uniform load of 12 kN/m12\text{ kN/m}. Span BC carries a uniform load of 8 kN/m8\text{ kN/m}. Determine the internal moments at the supports using the Moment Distribution Method.

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Example

Determine the kinematic indeterminacy (degrees of freedom, DOF) for a single-story, single-bay portal frame. The frame has two columns fixed at their bases and a rigid horizontal beam connecting them. Axial deformations of all members are assumed to be zero (members are axially rigid).

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Example

Analyze a portal frame with sidesway using the Slope-Deflection Method. The frame consists of two columns AB and CD (height h=4 mh=4\text{ m}) and a beam BC (length L=5 mL=5\text{ m}). Supports A and D are fixed. A horizontal point load P=50 kNP = 50\text{ kN} is applied at Joint B directed to the right. EIEI is constant for all members. Set up the basic slope-deflection equations.

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