Chapter 14 : Analysis of Perfect Frames (Graphical Method) „„„„„ 289

Analysis of

Perfect Frames

(Graphical Method)

Contents

1. Introduction.


2. Construction of Space
   Diagram.


3. Construction of Vector
   Diagram.


4. Force Table.


5. Magnitude of Force.


6. Nature of Force.


7. Cantilever Trusses.


8. Structures with One End
   Hinged (or Pin-jointed) and
   the Other Freely Supported
   on Rollers and Carrying
   Horizontal Loads.


9. Structures with One End
   Hinged (or Pin-jointed) and
   the Other Freely Supported
   on Rollers and Carrying
   Inclined Loads.


10. Frames with Both Ends
    Fixed.


11. Method of Substitution.

14.1. INTRODUCTION

In the previous chapter, we have discussed the

analytical methods for determining the forces in perfect

frames. We have seen that the method of joints involves

a long process, whereas the method of sections is a

tedious one. Moreover, there is a possibility of

committing some mathematical mistake, while finding

out the forces in the various members of truss. The

graphical method, for determining the forces in the

members of a perfect frame, is a simple and

comparatively fool-proof method. The graphical

solution of a frame is done in the following steps:

1. Construction of space diagram,


2. Construction of vector diagram and


3. Preparation of the table.

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