内置不同型钢的钢管混凝土组合构件横向冲击性能

在ABAQUS软件中建立了内置型钢的钢管混凝土组合构件横向冲击数值模型,通过已有横向冲击试验对模型的正确性进行了验证.对比了三种不同内置型钢对钢管混凝土构件横向冲击性能的影响,分析了组合构件冲击过程中的跨中挠度、冲击力和截面弯矩,讨论了型钢参数对构件抗冲击性能的影响.结果表明:内置型钢可以减小钢管混凝土构件在横向冲击荷载作用下的整体变形,提高其抗冲击性能;当型钢含钢率相同时,内置工字形型钢组合构件的抗冲击性能最好;内置型钢的截面形式对组合构件的弯矩分布影响显著;当型钢含钢率一定时,构件的抗冲击能力随着型钢腹板高度的增加逐渐提高,开展的型钢截面形式对抗冲击性能更有利;角钢的分布位置对构件的抗冲击性能有一定影响,构件的抗冲击性能随着型钢含钢率的增加而增强.

Performance of different steel-reinforced concrete filled steel tubular composite members under transverse impact load

The numerical model of steel-reinforced concrete-filled steel tubular composite members under transverse impact load was established in ABAQUS, and the correctness of the model was verified through previous transverse impact tests. The effect of three different profiled steel on the transverse impact performance of concrete-filled steel tubular (CFST) members were compared. The mid-span deflection, impact force and sectional moment of the composite members during impact were analyzed, and the influence of parameters of profiled steel on the impact resistance of specimens was discussed. The results demonstrate that the overall deformation of the CFST members under the transverse impact load can be reduced by reinforcing the section steel, and impact resistance of the membersincreases. When the profiled steel ratio is same, the composite specimens with I-shaped profiled steel have the best impact resistance. The profiled section form has a significant influence on the bending moment distribution of composite members. When the profiled steel ratio remains constant, the impact resistance of the specimen gradually increases with the increase of the profiled steel web height, and the outspread section form of the profiled steel is more favorable for impact resistance. The distribution position of the angle steel has a certain influence on the impact resistance of the specimen, and the impact resistance increase with the profiled steel ratio.