Strength and rotational behaviour of composite beam-column connections KARL VAN DALEN A N D HERNAN G o~o y Qlreer~'\ U~~i\vzr.\ity. Kit~g\tori, Ol~t., Crrrrrrrlrr K7L 3N6 Rcccived Octobcr 5, I98 1 Rcviscd manuscript acceptcd Fcbruury 18. 1982Thc rcsults of an cxpcrimcntal study of thc strength and rotational ch:uactcristics of colnpositc stccl-concrctc bcam-column conncctions arc reported. Thrcc typcs ofconncction. flexible, scmi-rigid, and rigid. wcrc studictl. Spccimcns in which thc stecl clcments wcrc conncctcd in identical fashion wcrc tcstcd with no concrctc slab ant1 with a hcavily ant1 a lightly rcinforcctl compositc slab that was continuous around thc column.It was found that provision.of as littlc as 0.46% of the concrctc slab arca. as slab rcinforccmcnt continuing arountl the column, cnablcd a bcam-column conncction to dcvclop a rnomcnt of rcsistancc at lcast cclual to thc ultirnatc moment capacity of the associated compositc bc:um, cvcn whcn thc conncction bctwccn thc stccl clcmc~its thcmsclvcs had no significant moment carrying capacity. The rotational capacity of the composite beam-column conncctions was at lcast equal to that of a conventional nonconipositc rigid stccl conncction.Can. J. Civ. Eng.. 9, 313-322 (1982)

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There is a large body of literature on both the techniques for bulge testing and experimental results for various metallic materials (see the book of Banabic [1]). Generally, the experimental data for isotropic materials are interpreted using the von Mises yield criterion [2]. In this paper, we investigate the role played by the third invariant of the stress deviator, on the response under bulging of isotropic materials that have the same mechanical response in tension and compression. To this end, we use the yield criterion developed by Cazacu [3] and our implementation of this model in the F.E. code Abaqus [4]. For isotropic materials, this yield criterion involves a unique parameter, denoted ; in the case when it reduces to the von Mises yield criterion while for it involves dependence on . The results of F.E. simulations of bulge tests for isotropic materials characterized by various values of the parameterput into evidence new aspects concerning the stress states experienced by the respective materials under bulging.