Mechanical Engineering

# Statics help

## Recommended Posts

Can someone help find the reactions at A and B thx

##### Share on other sites

Ra+Rb=4×4.2+2

Rb×3.2=4×4.2×2.1+2×4.2

Solve these two equations and get the answer.?

##### Share on other sites

There is a Hinge at C, The answers should be  Ax  = 0 ,  Ay = 7,1 kN (UP) , By = 11,7 kN (UP), MomentA = 6,24 kNm (Counterclokwise )

I dont get these answers when i solve ur equations.

##### Share on other sites

Thx Hugo. But as I said there is a Hinge at C. The answers should be.AX= 0 ,  Ay = 7,1 kN (UP) , By = 11,7 kN (UP), MomentA = 6,24 kNm (Counterclokwise )

##### Share on other sites

There is a joint at C so we have an additional equation that if we make section at that point we will have the sum of moment at C=0;

By=11.7;

Ay=7.1;

Ma=6.24;

Ax=0;

##### Share on other sites

This is a statically indeterminate problem. There are 4 unknowns. Three unknowns at A (horizontal reaction, vertical reaction and a moment) and one vertical reaction at B. We have only 3 equations from Statics. We need one additional condition - Deflection is zero at A.

##### Share on other sites
15 hours ago, Hnat Lesiv said:

There is a joint at C so we have an additional equation that if we make section at that point we will have the sum of moment at C=0;

By=11.7;

Ay=7.1;

Ma=6.24;

Ax=0;

You get the right answers, but i dont understand you get it.

##### Share on other sites
4 minutes ago, Straanger said:

You get the right answers, but i dont understand you get it.

Just using the equations of statics plus one additional equation at joint C

##### Share on other sites
1 minute ago, Hnat Lesiv said:

Just using the equations of statics plus one additional equation at joint C

I get it now thx alot. the matrix system confused me.

##### Share on other sites

Great help for me

## Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

Only 75 emoji are allowed.