TITLE: STATIC AND CINEMATIC BEHAVIOUR FOR A CANDU FUEL CHANNEL
             WITH INTERMEDIATE  SUPPORTS, SUBMITTED TO THE ACTION OF
             CONCENTRATED FORCES

 AUTHORS:   dr.fiz. Cezar DOCA- mcdoca@cc.nuclear.ro, cezar-doca@home.ro
                        ing. Luminita BEDREAGA

                      Institutul de Cercetari Nucleare Pitesti

ABSTRACT:

According to most of the opinions in literature, solving of questions related to static bending of the beams presupposes a long-range survey of more or less unitary computing algorithms. The dominant role is played by the way in which the beam-ends are supported and by the intermediate supports.

The algorithms complicate very much (depending also on the author) when the assessed beam is submitted to the action of concentrated forces: more complex and entirely computed examples are hardly found in reference literature.

The present paper suggests a unitary method for solving the problem of static and cinematic bending of beams, that might also undertake the action of single forces; to the latter, a set of four equations is assigned, similar to those used in the case of intermediate supports.

Consistent with the utilized algorithm, the authors also indicate an immediate computing formula for the reactions in supports.

With the purpose to check and validate this new approach, three computing examples (taken from literature) are discussed comparatively.

Finally, the paper briefly presents two software products (computer programs) developed by the authors and dedicated to the solving of problems related to the static and cinematic bending of beams with two or more supports in the presence of concentrated forces and/or of an axial force, with an immediate application in the study of the CANDU fuel channel.

Starting from the remark that such theoretical results are not to be found - at least explicitly - in specialized literature, the authors venture to believe that the computing formula of reactions in supports as well as the equations describing the concentrated forces represent an original contribution in the study of beams bending.