1. Department of Civil Engineering and Engineering Mechanics, Columbia University, 500 West 120th Street, New York, New York 10027, USA, Telephone: 1/212-854-1203, Telefax: 1/212-854-6267,
2. Department of Civil Engineering and Engineering Mechanics, Columbia University, 500 West 120th Street, New York, New York 10027, USA
3. Langan Engineering and Environmental Service, Inc., Telephone: 1/203-562-5771, Telefax: 1/203-789-6142,
4. Department of Civil Engineering and Engineering Mechanics, Columbia University, 500 West 120th Street, New York, New York 10027, USA, Telephone: 1/212-854-4153, Telefax: 1/212-854-6267,
5. Construction Engineering Division, Public Works Research Institute, Ministry of Construction, Tsukuba, Japan, Telephone: 81/298-64-4703, Telefax: 81/298-64-0564,