project bridge lift

[Marco Ramagini]

Hello everyone,
I must carry out the project of a lift bridge for motorcycles of the type in figure (1). I already know that the discussion has been started several times but I have not found answer to my doubts. to start, I tried to schematize the machine with beams but already at this point I got stuck. According to my knowledge of construction science, I have come to conclude that the system is three times that are not determined (see figure (2)). I wondered if this first schematization was correct.
I thank everyone who wants to answer me.

 

[Matteo]

before you worry about the answer, worry about having formulated the question well: the picture pattern is not represented correctly (there are at least 2 errors: one related to the use of classical sdc constraints, the other substantial).

You should also turn the photo and provide a cleaner design: are you an engineering student or not?

 

[Matteo]

If you rewrite pattern and question correctly I give you the answer, but at that point you won't need it anymore.

 

[meccanicamg]

precisely for these reasons, if you go to look at the discussions with the development of the beams with the reactions you have everything explained.
If you don't have any basics, you better let it go. if for any reason you have to build it, I would say it is better to rely on experts.

the locking system is definitely isostatic.
the hydraulic cylinder is an internal force, so when it is in the date position it is a rigid element.
If you remove the system you can get the reactions.
If you look good in google you will find several dispensers that treat the pantograph, since in these years you are all fixed with this object.