{"title":"An Improved Tie Force Method for Progressive Collapse Resistance of Precast Concrete Cross Wall Structures","authors":"M. Tohidi, J. Yang, C. Baniotopoulos ","volume":85,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":1,"pagesEnd":10,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/9997001","abstract":"
Progressive collapse of buildings typically occurs
\r\nwhen abnormal loading conditions cause local damages, which leads
\r\nto a chain reaction of failure and ultimately catastrophic collapse. The
\r\ntie force (TF) method is one of the main design approaches for
\r\nprogressive collapse. As the TF method is a simplified method, further
\r\ninvestigations on the reliability of the method is necessary. This study
\r\naims to develop an improved TF method to design the cross wall
\r\nstructures for progressive collapse. To this end, the pullout behavior of
\r\nstrands in grout was firstly analyzed; and then, by considering the tie
\r\nforce-slip relationship in the friction stage together with the catenary
\r\naction mechanism, a comprehensive analytical method was developed.
\r\nThe reliability of this approach is verified by the experimental results
\r\nof concrete block pullout tests and full scale floor-to-floor joints tests
\r\nundertaken by Portland Cement Association (PCA). Discrepancies in
\r\nthe tie force between the analytical results and codified specifications
\r\nhave suggested the deficiency of TF method, hence an improved
\r\nmodel based on the analytical results has been proposed to address this
\r\nconcern.<\/p>\r\n\r\n
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