Stress simulation Problem

Greetings to allcommunity.
I am facing a problem with my construction simulation study. The construction i made consists of solids and a central beam. When i run the simulation study, i believe that something is going wrong with deformation.
Please due to i am junior to simulations, i need a good guidance and your opinions.
For a reason i ignore, there are no connection between weldment beam and solid beam.......
What am i doing wrong.

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