Journal of Structural Engineering (BioMonthly): Vol.38 Issue.4 October-November'2011 - USA American Concrete Institute October-November'2011 - 403PP - 38 . ISSN: 0970-0137 Subjects--Topical Terms: Civil Subjects--Facted Index Terms: JournalStructuralEngineering(BioMonthly):Vol.38 Issue. October-November'2011Civil