Created
January 13, 2017 11:06
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clc | |
clear all | |
close all | |
syms x A E real; | |
p = [1 x]; | |
xs = [0 1.5 2.1 3.14]; | |
n = length(xs); | |
Kg = zeros(4, 4) | |
for i = 1:n-1 | |
Me = [1 xs(i); 1 xs(i+1)]; | |
L = det(Me); | |
N = p * inv(Me); | |
Be = diff(N, x); | |
K = L * Be' * A * E * Be; | |
Kl = sym(zeros(4, 4)); | |
Kl(i, i) = K(1, 1); | |
Kl(i, i+1) = K(1, 2); | |
Kl(i+1, i) = K(2, 1); | |
Kl(i+1, i+1) = K(2, 2); | |
Kl | |
% agregacja | |
Kg = Kg + Kl; | |
end | |
Kg | |
% utwierdzenie pierwszego węzła | |
Kg_utw = Kg(2:end, 2:end) | |
% wymuszenia | |
F = [10; 20; 0]; | |
% odkształcenia w węzłach | |
X = inv(Kg_utw) * F |
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