Solve Statics Problems: Finding Forces in Members AB, BH, OH"

[Idividebyzero]

1.find the force in members AB BH OH



2.

the forces at O is 3000 lb at O, 5000 lb downward on A and 1000 lb -x direction at A. and 7000 lb -y direction at C. reaction forces at D and E are statically indeterminant.



3. sorry for the crappy sketch. I've gotten AB correct taking method of joints cutting through members ab,hb,hg and taking the moment about H. also their is a pin at D and E that normally have external reaction forces in the x and y direction however the problem mentions that they are statically indeterminant. not sure where to go from here on the other members i thought about using the same method of joints cut and taking the moment about O.

 

[Idividebyzero]

and i meant method of sections not joints

 

[Idividebyzero]

scratch off force in member OH found it using method of joints at O

 

[Idividebyzero]

never mind i figured the rest of it out as well

 

[DeeNos]

I would approach this problem by first analyzing the given information and identifying the unknown forces. In this case, we are looking for the forces in members AB, BH, and OH.

To find the force in member AB, we can use the method of joints and cut through the members AB, HB, and HG. By taking the moment about point H, we can solve for the force in AB. This is a valid approach and it seems like you have already successfully solved for the force in AB using this method.

However, for the other members BH and OH, we cannot use the same method of joints since they do not have a joint at point H. Instead, we can use the method of sections. We can cut through members BH and OH and isolate them from the rest of the structure. By taking the moment about point O, we can solve for the force in BH and OH.

It is important to note that since the problem mentions that the reaction forces at D and E are statically indeterminate, we cannot solve for them using traditional methods. Instead, we may need to use more advanced techniques such as the method of virtual work or the slope-deflection method to solve for these reaction forces.

In summary, to find the forces in members AB, BH, and OH, we can use the method of joints for AB and the method of sections for BH and OH. However, we may need to use more advanced techniques for the reaction forces at D and E. It is also important to double check our calculations and ensure they are consistent with the given information and any applicable physical laws.