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New shape functions for the lateral deflection of rectangular plate elements for the Idealized Structural Unit Method (ISUM) are developed. First, the collapse behaviour of rectangular plates under longitudinal and transverse thrust is studied by elastoplastic large deflection FEM and the characteristics of the collapse modes are highlighted. Based on these characteristic deflection modes, new lateral shape functions for the large ISUM elements are assumed and implemented. Comparisons with FEMdoi:10.2534/jjasnaoe1968.2000.209 fatcat:ydd57ac7qnfufofsa6b5fxceye