# Recent content by wkh023002

1. ### Torsional checking for Steel angle member

Homework Statement I meet a problem below: To check if the angle :200x150x12 S275 Grade can take a twist of 30kNm (on plan ) with Span 3m fixed end connected. Homework Equations θ = T L / J G The Attempt at a Solution My question is that even I got the angle of twist for this...
2. ### Soil mechanics-Triaxial test

Soil mechanics--Triaxial test Homework Statement Generally, the triaxial tests can be classified as three types, i.e., UU, CU, and CD tests. The type of test to be adopted depends on how best we can simulate the field conditions. In other words, the purpose of carrying out a particular...
3. ### Structural mechanics-force diagram,shear stress,elastic curve

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...
4. ### Truss,zero force member

THANKS A LOT PHANTHOMJAY!Oh! i must have made a stupid mistake! i think the roller should be placed in such a way that it can slide vertically!
5. ### Truss,zero force member

nope the tutor showed that the wheels of the roller are placed in x-direction(horizontally) , under this condition can the moment still be balanced?If contradiction occurs , i think i' ve made a mistake!
6. ### Truss,zero force member

why is there a x-component of F_roller?The roller should be placed vertically as my tutor finally adjusted the question.(sorry! i missed to state in the question!)Doesn't the roller only act a y-direction force on G?i.e. Sum of Fy=F_roller+F_AG=0 and Sum of Fx=F_GF=0 i have tried to take a...
7. ### Truss,zero force member

i guess F(gf) should be equal to zero as there is no other force to balance it in x- direction.Am i right? However ,Joint G is applied with a reaction by the roller, i am not sure whether zero member can exist at the joint which is applied with reaction. Some textbooks state that zero force...
8. ### Truss,zero force member

One more? i cannot come up with any ideas pls give me some hints!
9. ### Truss,zero force member

let me explain my solution in detail in this way: consider FBD of joint D,take x-axis along bar CD, as there is no other force to balance F(cd) so F(cd)=0.And, F(de)sin\theta=0 ,=> F(de)=0 Thus , CD DE become zero force members which can be neglected in the structure Then, consider the...
10. ### Truss,zero force member

Homework Statement using joint method,indicate all the zero force members in the truss (Note that G is a roller, and A is a pin) Homework Equations \sumFx, Fy=0 The Attempt at a Solution my solution: consider D, by summation Fx,Fy=0, F(cd),F(de)=0 consider E since\sumFx=0,=>...