Structural mechanics-force diagram,shear stress,elastic curve

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The discussion focuses on solving structural mechanics problems related to force diagrams, shear stress, and elastic curves. The user struggles with calculating reactions Ax, Ay, Dx, and Dy using four equations, including static equilibrium conditions. Additionally, the user seeks clarification on the meaning of G=80 kN/mm² and the application of Bredt-Batho theory. The conversation emphasizes the importance of understanding internal moments to derive necessary equations for solving the system.

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  • Understanding of static equilibrium equations in structural mechanics
  • Familiarity with shear force calculations
  • Knowledge of Bredt-Batho theory in structural analysis
  • Concept of elastic curves in beam theory
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Students and professionals in civil engineering, structural engineering, and mechanics who are dealing with force diagrams, shear stress, and elastic curves in structural analysis.

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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
505-2Ax-5Ay=0

For Question 2:
i don't know what is the meaning of G=80kN/mm^2 and how to calculate the shear force?
also, what is Bredt-Batho theory? My professor haven't mentioned it so far.

For Question 4:
The first load from left P=WL/5 is outside the Y-axis, 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?
 

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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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