I'm currently trying to extend the shock-absorbing capabilities of a welded steel structure that is shown in the following image. It is a structure that supports a slat conveyor. A load is to fall approximately in the middle half of the structure. The base of the structure rests in a concrete foundation.
I need to expand the shock-absorbing capabilities because I'm worried about the structure failing due to pure impact forces. I'm not as worried by vibrations as by the maximum force exerted on it due to the impact. The load impact is difficult to quantify, even for a worst case scenario, but it is safe to say that the structure has resisted an impact force that is 25% lower than the one that is to fall now.
I would prefer not to change all the beam sizes, since the slat conveyor that rests on top of it is already assembled, but I could add some supports if needed.
According to Design of Welded Structures, however, making the beam span between supports shorter raises the impact stresses suffered by the structure, even if it lowers the static stresses (once the load is in place).Is there anything I can do to minimize these impact stresses?