School;
of;
Municipal;
and;
Environmental;
Engineering,;
Harbin;
Institute;
of;
Technology,;
Harbin;
150090,;
China.;
Department;
of;
Civil;
and;
Structural;
Engineering,;
The;
Hong;
Kong;
Polytechnic;
of;
University,;
Hunghom,;
Kowloon,;
Hong;
Kong,;
China;