Dr. Ashish VermaAssistant ProfessorDepartment of Civil EngineeringIndian Institute of Technology (IIT) GuwahatiNorth Guwahati, Guwahati-781039Assam, IndiaPh: 91-361-2582421, Fax: 91-361-2690762E-mail: ashishv@iitg.ernet.in, rsashu@yahoo.com