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Structural mechanicsforce diagram,shear stress,elastic curve 
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#1
Nov2507, 09:33 AM

P: 10

There are totally 4 questions .i struggled for a whole day and i still cannot solve it.Please help me!
For Question 1: My problem is that i cannot find out the reaction Ax,Ay,Dx,Dy though i establish 4 eqt: 1:Ax+Dx=90 kN 2:Ay+Dy=90 kN 3:summation Ma=0 ,anticlockwise positve 125+2Dx+5Dy=0 4:summation Md=0 ,anticlockwise +ve 5052Ax5Ay=0 For Question 2: i dunno what is the meaning of G=80kN/mm^2 and how to calculate the shear force? also, what is BredtBatho theory? My professor haven't mentioned it so far. For Question 4: The first load from left P=WL/5 is outside the Yaxis, does it mean that i can neglect it? to find the equation of elastic curve, do i need to establish the Moment equation for each section? 


#2
Nov2507, 02:34 PM

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P: 6,036

For question 1, in 2 dimensional frames, there are only 3 equations of statics external to the system that you can use in solving for external reactions...sum of Fx=0, sum of Fy=0, and sum of moments about any point = 0. The 4th equation you list is redundant. Since there are 4 unknowns, you must look at what is going on internal to the system to get your 4th equation. What do you know about the moment at the hinged joint C?



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