Experimental study on the ultimate bearing capacity of deck grillage structure with multiple openings

  Objectives  In order to study the impact of the multi-opening structure on the ultimate bearing capacity of deck grillage structure,

  Methods  the ultimate bearing capacity of the double deck frame model with two different opening types was studied experimentally under the uniaxial compression load. This paper identified the stress change pattern of deck grillage with multiple openings, by analyzing the buckling failure mode and ultimate bearing capacity of double-opening deck structure and broadside opening structure in the process of gradual collapse.

  Results  The experiment results show that the stress concentration is obvious at the corner of the opening. With the gradual increase of axial compression load, the stress of the middle deck of the opening increases sharply, and the multi-opening structure eventually suffers buckling failure in the middle of the biggest opening. The deck opening size has a significant impact on the initial axial stiffness of the structure, while the side opening structure has a dominant influence on the ultimate bearing capacity in the elastoplastic deformation stage.

  Conclusions  The experimental research methods and results can provide reference for the design of such deck structures.