of;
Civil;
Engineering;
and;
Architecture,;
University;
of;
Technology;
Szczecin,;
Szezeein;
70-311,;
Poland;
of;
Civil;
Engineering,;
Warsaw;
University;
of;
Technology,;
Warszawa;
00-637,;
Poland;
of;
Civil;
Engineering;
and;
Geodesy,;
Military;
University;
of;
Technology,;
Warszawa;
00-908,;
Poland;