Contents
What is stiffness factor of beam?
(b) Stiffness Factor (i) It is the moment that must be applied at one end of a constant section member (which is unyielding supports at both ends) to produce a unit rotation of that end when the other end is fixed, i.e. k = 4EI/l.
What is relative stiffness factor?
The term stiffness is the extent of the rigidity of any material. Relative stiffness can also be defined as ratio of second moment of area and member length. It can be said that the relative stiffness is ratio of stiffness of a member to total stiffness of the all members that are meeting at joint.
What is the difference between stiffness and relative stiffness?
How is the stiffness of a beam determined?
1. Member Pin (or Roller) Supported at Far End if the far end was fixed supported, the stiffness factor K = 4EI/L would have to be modified by 3/4 to model the case of having the far end pin supported 2. Symmetric Beam and Loading the center span’s stiffness factor will be one half that usually determined using K = 4EI/L 3.
What is the carry over factor for beams?
For the other member connected to node B, member BC, the opposite end at node C is a pin that cannot take any moment. Therefore, the carry-over factor for that member C O = 0 as shown in the table. This carry-over process is also shown for the two members in Figure 10.6 part (d).
How to determine the distribution factor of a beam?
Determine the distribution factors for each member at each node based on relative stiffness of the members using equation (3). Use a distribution factor of zero for a fixed support and 1.0 for a pinned support with only one connected member. Determine the fixed end moments for all members that have external loads applied between the end nodes.
What should stiffness factor k = 4ei / L be?
if the far end was fixed supported, the stiffness factor K = 4EI/L would have to be modified by 3/4 to model the case of having the far end pin supported.