Recent content by Ekaterina Wiktorski

Hi! Is anyone experienced With T&D calculations using above mentioned model: ? I have a trouble to understand what exactly F1 is and how to calculate it. I know it is an axial force, so it is drag? And once you calculate drag for one element, you use it as F1 to calculate drag in 2ns element...

OK, it became a bit more clear, thank you very much for your input.

Right, I see now. I want to calculate displacement in pipe using dynamic eq. [M]{U''}+[C]{U'}+[K]{U}={F}, where U is displacement, and U' and U'' are its derivateves. M, C, K are matrices of mass, damping and stiffness. Matrices are defined, and some of the expressions contain Ixy and Iz (area...

OK, thank you! I understand that it is a confusing question, let's say z in the vertical axis. I wanted to see your opinions on this one, as I didn't see the difference between body's moment of inertia in different axes...

Hi, I've been always using eq. I=Pi*(D^4-d^4)/64 to find moment of inertia of a pipe. Recently I've seen that moment can be in different directions, and then it is expressed differently. So what is the difference between Ixy and Iz?