圆锥形中空夹层钢管混凝土构件抗扭性能及承载力计算方法研究

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中图分类号：034；TU391 文献标志码：A

Abstract：Aiming at the demand for torsional capacity of high-power ofshore wind power supporting structure，the full-range torsional mechanism of tapered concrete-filled double skin steel tubular（TCFDST） members was examined under the large holow ratio，high taper degree，and out-of-code diameter-to-thickness （ D/t ）ratio.The characteristics of torque-angle curve could be divided into the elastic stage，elasticplastic，plastic strengthening stage，and failure stage.Influence of key parameters on ultimate bearing capacity and stiffness was revealed. The hollow ratio and strengths of steel and concrete were positively correlated with the ultimate torque and stiffness; D/t ratios of outer or inner tubes had negative relationship to it ；the axial compression ratios had positive relationship within the limited value，and inversely，it was negatively correlative.A method based on laminated tube theory was proposed to calculate the torque-angle curves of TCFDST members.Subsequently，the hierarchical integration method was established and verified based on the Chinese code and relevant literature，for calculating the ultimate torsional capacity of concrete-filled double skin steel tubular members，and the diffrence of various methods in determining N T curve was also analyzed.The research results in this paper can provide valuable reference for the application of TCFDST members with large hollow ratios，large taper degree，and out-of-code D/t ratios in wind power projects.

Key Words ：tapered concrete-filled double skin steel tubular member; numerical modelling;torque distribution mechanism;laminated tube method;N-T curve

大功率海上风电设备应用日趋广泛，海上风电主体结构体量显著增大以及风电塔架在海洋环境中承受压弯扭等复杂的受力工况，增加了风电塔架支撑柱的设计需求[1-3]。（剩余17484字）