Bar Grating - Continuous Spans and Negative Moments

[sundale]

Consider a bar grating installed as say a two span continous beam over three supports.

Is bucking of the bearing bars over the interior beam (due to negative moment) an issue, since the cross bars are welded to the top of the bearing bars?

Thanks in advance for any opinion offered.

 

[SlideRuleEra]

In my experience (heavy industry), bucking for any reason is not a problem if the grating is properly anchored and the grating manufacturer's load rating is (more or less) observed. The only failures witnessed has been local, permanent deflection where point loads (heavy machine parts, wheeled loads, etc.) were placed on the grating.

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[234eng]

The grating called out according to the chart. I assumed if size and span are within limited, then the grating should be OK.

Yes, the grating will act very funny, if the span of the bearing bars were placed or the drawing called out wrong direction.
I personally saw couple times that designer did not check the drawing or the contractor bought the grating that span in wrong direction. The grating that spans in wrong direction, it acts like a spider web.