Suppose there is a vertical reaction. What do the force and moment sums tell you?fonseh said:
what do you mean ? Can you please explain further?haruspex said:
You can determine the horizontal force at A easily. Take moments about D. What do you deduce about the vertical reaction at A?fonseh said:
what do you mean ? Can you please explain further?haruspex said:
what do you mean ? Can you please explain further?haruspex said:
what do you mean ? Can you please explain further?haruspex said:
The vertical reaction at A create clockwise moment about Dharuspex said:
Yes, but write the equations. First, find the horizontal force at A. Then take moments about D to find the vertical force.fonseh said:
HA = 20kN to the left . moment about D = VA(2) -20(1) = 0 , VA = 10kN(upwards) , is it correct ?haruspex said:
The equation must include moments due to all the forces, including those at B.fonseh said:
moment about D = -20(1) +VA(2) -20(1)+20(2) = 0 , Thus VA = 0 ?haruspex said:
Right.fonseh said:
A pinned support is a type of structural support that allows for rotation but restricts translation. This means that the support can rotate around a pin or hinge, but cannot move horizontally or vertically.
A pinned support can only provide a reaction force in the direction perpendicular to the pin or hinge. This means that the support can only resist forces that try to push or pull the structure away from the pin, but cannot resist forces that try to move the structure horizontally or vertically.
Some examples of structures that use pinned supports include bridges, cranes, and truss systems. These structures often require the ability to rotate at certain points while still maintaining stability and support.
The reactions at pinned supports can be calculated using the principles of statics. By analyzing the forces and moments acting on the structure, the reactions at the support can be determined. This calculation is important in designing and analyzing the stability and safety of a structure.
If a pinned support is replaced with a fixed support, the reactions at that support will change. A fixed support restricts both translation and rotation, meaning it can resist forces in all directions. This can significantly affect the overall stability and strength of the structure.
