中空夹层金属管混凝土构件侧向冲击试验研究

Test Analysis of Concrete-Filled Double Skin Metal Tubular Members Under Lateral Impact

为提高海洋平台结构的抗冰能力,提出一种新型中空夹层金属管混凝土导管腿构件。通过理论分析、数值模拟和试验相结合,研究不同外钢管材料(Q345钢、奥氏体304级不锈钢和T6061铝合金)对中空夹层钢管混凝土构件的影响。通过单次冲击和连续冲击两种加载方式进行加载,并与钢质空心导管腿进行对比,试验结果发现:组合构件抗冲击性能优于空管构件,铝合金组合构件整体抗冲击能力较差,不锈钢单次冲击作用下极限承载能量高达18.83kJ以上,小能量连续冲击作用下承载冲击次数最多,不锈钢组合构件抗冲击力学性能最好。结合有限元ABAQUS软件,对单次冲击构件建模并得出计算结果,与试验结果基本吻合。

Based on the improvement of ice resistance of offshore platform structure,a new type of concrete-filled double skin metal tubular jacket leg members is proposed.The method of theoretical analysis,test and simulation is used to study its impact resistance under lateral impact load.The outside tube materials of the members are respectively Q345steel,grade 304austenitic stainless steel and T6061aluminum alloy.The single impact and continuous impact are adopted for the impact form.The time-history curve of impact load and time-history curve of mid-span deflection are recorded and compared with those of hollow pipe members.The results show that the impact resistance of combined members is better than that of hollow pipe members,and the overall impact resistance of aluminum alloy combined members is poor.The ultimate bearing energy of stainless steel under single impact is more than 18.83kJ,and the number of bearing impact times under the continuous impact of small energy is the most,so the impact resistance of stainless steel combined members is the best.In addition,combined with the finite element ABAQUS software,the single impact members are modeled and the calculation results are basically consistent with the test results.