Stainless steel core pipe is an important force transmission component of stainless steel deck core plate,and its flat pressure performance is closely related to the bearing capacity of bridge deck.Due to the requirements of brazing process,the wall of the stainless steel core pipe is provided with a double ventilation round hole.In order to study the effect of double ventilation circular holes on the flat compression performance of stainless steel core pipe,two groups of stainless steel core tubes with different thicknesses were tested for flat compression performance and nonlinear buckling analysis by finite element method.The test results could verify the correctness of the nonlinear buckling analysis method of stainless steel core pipe by Riks arc length method.The factors such as the diameter d of circular hole,the eccentricity e and the wall thickness t of core tube were considered.The stainless steel core pipe models with different specifications were established.The nonlinear buckling analysis was carried out.The influence of multi-parameter synergy on the flat compression performance of stainless steel core pipe was explored.The research results are drawn as follows.The flat pressure test curve of stainless steel core tube can show obvious nonlinear characteristics.It can be divided into elastic stage,elastic-plastic stage and plastic failure stage.The local buckling failure is easy to occur preferentially at the corner of vent hole,pipe end trimming and 10 mm pin.The ultimate load Pu of stainless steel core tube and its corresponding compression displacement δu decrease with the increase of aperture d and eccentricity e,increases with the increase of wall thickness t.The ultimate load Pu of the core tube is more influenced by the aperture d than by the eccentricity e,the ultimate load Pu decreases by 6.00%～15.51%by increasing the aperture.However,the increase eccentricity can reduce the ultimate load Pu of the core tube by 0.64%～9.22%.The core tube can avoid opening holes in the middle of the tube body(e/H=0.5).When aperture ratio d/D≯0.04 and eccentricity ratio e/H≯0.3,vent hole has little influence on the ultimate bearing capacity of the core tube,having no influence on the compression displacement δu under the ultimate load.It is suggested that it should be taken as the design value of vent hole.The critical value and variation law obtained in the study can be used for structural design and optimization of new stainless steel deck core plate.
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