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clear;
clc;
%loading history
dt=0.01;
ti=0.0008;
te=12;
t=ti:dt:te;
pt=(10*t./1.5).*(t>=0 & t<=1.5)+(20-10*t./1.5).*(t>1.5 & t<=3)+0.*(t>3);
m=length(pt);
%load distribution in space
rp=0.1;
ri=0;
rc=0.1;
dr=0.001;
r=ri:dr:rc;
pr=1*(r<=rp)+0*(r>rp);
n=length(pr);
%load function with respect to t and r
p=pr.'*pt;
%green's function
G=1;
cs=1;
for i=1:1:m
for j=1:1:n
u(j,i)=heaviside(cs*t(i)-r(j))/(pi*G*sqrt(t(i)^2-(r(j)/cs)^2));
end
end
%convolution and response of displacement
for i=1:1:m
for j=1:1:n
v(j,i)=0;
for k=1:1:i
for g=1:1:j
v(j,i)=v(j,i)+p(g,k)*u(j-g+1,i-k+1)*dr*dt;
end;
end;
end;
end;
%plot the response history
plot(t,v(n, );
xlabel('t/s');
ylabel('v/m');
grid on;
title('response of point A or C');
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clear;
clc;
%loading history
dt=0.01;
ti=0.0008;
te=12;
t=ti:dt:te;
pt=(10*t./1.5).*(t>=0 & t<=1.5)+(20-10*t./1.5).*(t>1.5 & t<=3)+0.*(t>3);
m=length(pt);
%load distribution in space
rp=0.1;
ri=0;
rc=0.1;
dr=0.001;
r=ri:dr:rc;
pr=1*(r<=rp)+0*(r>rp);
n=length(pr);
%load function with respect to t and r
p=pr.'*pt;
%green function
G=1;
cs=1;
for i=1:1:m
for j=1:1:n
u(j,i)=heaviside(cs*t(i)-r(j))/(pi*G*sqrt(t(i)^2-(r(j)/cs)^2));
end
end
%convolution and response of displacement
v=conv2(u,p);
%plot the response history
rr=r(n);
[tpu,rpu]=meshgrid(ti:dt:2*te-dt,ri:dr:2*rc);
[X,Y,Z]=meshgrid(linspace(min(tpu( ),max(tpu( )),linspace(min(rpu( ),max(rpu( )),linspace(min(v( ),max(v( )));
V=Y;
h=contourslice(X,Y,Z,V,tpu,rpu,v,[0 0]+rr);
set(h,'edgecolor','k');
contourslice(X,Y,Z,V,tpu,rpu,v,[0 0]+rr);
xlabel('t/s');
ylabel('r/m');
zlabel('v/m');
axis([0 12 0 0.1 0 12e4]);
view(0,0);
grid on;
title('displacement response history of point A or C'); |