huangyhg

beam stiffening steel plate calc
i am currently redesinging a beam that had been installed two feet longer that was origionally designed for. the problem is the beam cannot be replaced, an there is no room to add other beams adjacent to it to carry the load. i was planning on desinging steel plates to bolt on either side of the beam to help stiffen the beam. as constructed, the beam now fails under the recommended loads (for bending and deflection). how would i go about designing the thickness of the steel plates? any help would be great, as i am stuck right now.

determine the moment and shear on the beam. determine the required section modulus, area, and moment of inertia required to resist the loads. provide the additional steel required to meet the required section properties. you can limit the length of extra steel by providing it just where it is required as determined by the loading. if this is a steel beam, welding a channel or tube to the bottom flange is commonly done to increase the load carrying capacity of a beam. attention should be paid to detailing the required welding. this is easier than attaching plates to a web. if this is a wood beam, what you will be designing is a flitch beam. attention to boldt size and spacing and to deflection. the design of this has been answered in previous posts. structural renovations of buildings (alexander newman) provide examples for strengthening in place structural elements.
thanks for your help. i actually ended up figuring it out right after i wrote this. and my problem was for a wood beam.

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