Research on the dynamic response of open-web girders in new floor structures under near-blast load based on the CEL method

The study utilized the CEL method, which combines the Eulerian finite element and the Lagrangian finite element methods, to analyze the displacement and dynamic response of Open-web girders within a new floor structural Open-web sandwich plate under close-range blast loading. By comparing simulation results with existing literature experiments, the study confirmed the reliability of the CEL method and the effectiveness of the constitutive parameters of the materials employed. 3D solid models were created using Abaqus software, comprising explosives, air, Open-web girders, dense ribbed beams, and solid web girders in the Eulerian region, with the simulation results being compared and analyzed. The research outcomes reveal: (1) The dynamic response of Open-web girders to close-range blast loading closely resembles that of dense ribbed beams and solid web girders, with a small amount of concrete dislodged from both sides of the beam nearest to the blast point and the shear keys of Open-web girders being more susceptible to damage. (2) The local bending moments of the top and bottom ribs and shear keys of the Open-web girder significantly influence the overall displacement response. These beams exhibit distinct stress characteristics when utilizing the same reinforcement without increasing the shear key width; however, increasing the shear key width aligns the dynamic response of Open-web girders more closely with that of dense ribbed beams and solid web girders. (3) There is a noticeable difference in the Mises stresses of the reinforcement among Open-web girders, dense ribbed beams, and solid web girders when using the same reinforcement.