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anonymous
 one year ago
Help me please
anonymous
 one year ago
Help me please

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mathmate
 one year ago
Best ResponseYou've already chosen the best response.1@jacalneaila Need to clarify a few things before starting to work on the problems. 1. Are these frames or trusses? If they are frames, there should be hinges only at the supports, and the other \(joints \) should not have a black dot (meaning hinge) shown. 2. If they are trusses, I don't believe they are stable. 3. Also, please clarify the support condition at support A of the second frame, is it an ordinary hinge, or is the member BA resting on a roller (meaning the reaction is perpendicular to the tangent BA). 4. Or, is it a normal roller support with reaction vertically upwards?

mathmate
 one year ago
Best ResponseYou've already chosen the best response.1What about the support condition of the second frame at A? dw:1440932090078:dw

mathmate
 one year ago
Best ResponseYou've already chosen the best response.1Did you calculate the reactions?

mathmate
 one year ago
Best ResponseYou've already chosen the best response.1For the first one, I have Ray+Rfy=0, Rax+Rfx+100=0 Substitute Rfy and Rfx into following (so system of 2 equations) Ma: 100(9)Rfx(4)+Rfy(12)=0 Mf: 100(5)Rax(4)+Rfy(12)=0 Solving gives Rax=0,Ray=125/3,Rfx=100,Rfy=125/3
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