Behaviour of girder webs subjected to patch loading

Imperfections in steel girder webs with and without perforations under patch loading

“…6), a reduction of about 5% due to imperfections occurs for s s /a = 0.08. Therefore, the elastic critical stress becomes about 49% of the ultimate strength value, obtained with non-linear analysis, confirming experimental estimation of Granath and Lagerqvist [11].…”

“…According to Granath et al [12] the load corresponding to the end of the ''reversible'' behaviour of the panel without accumulation of plastic strains was here considered as the load to be compared with the elastic critical load obtained with the eigenvalue analysis. Granath and Lagerqvist [11] showed, through FEM analyses verified by tests, that yielding in the web plate started at 49%-78% of the ultimate load carrying capacity. The lower value is for a ''stocky'' web while more slender webs yielded at higher load ratios.…”

Integrated investigation of an incremental launching method for the construction of long-span bridges

“…Although researchers and engineers have investigated the incremental launching method for concrete and steel girders [1,2,[6][7][8][9][10][11][12], the stability and stress concentration issues raised by long-span hybrid archgirder bridges when the integrated incremental launching technology is used are more prominent than those exhibited by routine girders during the launching process because of their thin plates, slender structural components, and complicated structural systems. Previous studies on the incremental launching method usually focused on isolated structural members such as slender plate girders [8], I-shaped steel girders [9,13], and others [10,11], conducting parametric analysis on the non-uniform distribution of support reaction of slide shoes and the ultimate loadbearing capacity [1,3,5,6,8,9,12,13].…”

“…Previous studies on the incremental launching method usually focused on isolated structural members such as slender plate girders [8], I-shaped steel girders [9,13], and others [10,11], conducting parametric analysis on the non-uniform distribution of support reaction of slide shoes and the ultimate loadbearing capacity [1,3,5,6,8,9,12,13]. However, few efforts have been made to apply incremental launching construction processes to largescale hybrid structures that use long cantilever spans and that raise potentially complex questions of stress concentration and stability.…”

Influence of longitudinal stiffeners on elastic stability of girder webs

“…In particular the use of the finite element method allowed the study of any geometry, initial imperfections [2,3], particular configurations of the load, like patch loading or localised symmetrical loads [4][5][6][7][8], and a wide range of constitutive laws for the material in non-linear range [9,8,24,10].…”