Question on moment distrobution with sway

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SUMMARY

The discussion focuses on calculating the vertical and horizontal components of forces at point D in a frame subjected to sway. The user references the principle of total moments, specifically the equation: total moments = moments before sway + a(moments after sway). The challenge arises from the applied forces acting on the joints and the inclination of members AB and CD, complicating the determination of the origin of rotation. Visual aids are provided to clarify the cutting of frame members at joint locations to analyze forces effectively.

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  • Understanding of static equilibrium principles in structural analysis
  • Familiarity with moment distribution methods in frame analysis
  • Knowledge of internal forces such as shear and bending moments
  • Ability to interpret structural diagrams and free-body diagrams
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  • Study the method of sections for analyzing forces in trusses
  • Learn about the moment distribution method in structural engineering
  • Explore the concept of cutting members to analyze internal forces
  • Investigate the effects of sway on frame stability and design
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Civil engineers, structural analysts, and students studying mechanics of materials who are looking to deepen their understanding of force distribution in frames under sway conditions.

nemesis24
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hello there i have this question that seems quite compilcated, i was hoping some one could help me into solving it.

basically i have a frame that can be seen in the diagram, i have to work out the vertical and horizontal components at point D. i was curious as to how i can do it.

i know it works on the principles of useing total moments = moments before sway + a(moments after sway) but i am a little concerned with the applied forces being on the joints themselves, along with the incline of both AB and CD - which makes it harder to find the orgin of rotation.

any help would be appricated thanks
 

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anyone?
 
if you are confused to disintegrate your frame member where a force on it you can cut your pins(joints) locations like in this http://img221.imageshack.us/img221/4594/problem1gq1.jpg
http://g.imageshack.us/img221/problem1gq1.jpg/1/

and consider as these cuts are so close to joints and then cont. as you solve cut in any point of member where there are normal, shear and internal moments are exist
 
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