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

王淑红 ,  刘向宏 ,  王建涛 ,  孙清 ,  张琳琳 ,  李国强

应用力学学报 ›› 2025, Vol. 42 ›› Issue (6) : 1270 -1283.

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应用力学学报 ›› 2025, Vol. 42 ›› Issue (6) : 1270 -1283. DOI: 10.11776/j.issn.1000-4939.2025.06.007
固体力学

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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Study on torsional behavior and bearing capacity of tapered concrete-filled double skin steel tubular members

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摘要

面向大功率海上风电支撑结构抗扭承载力需求,研究了大空心率、大锥度和超限径厚比圆锥形中空夹层钢管混凝土(tapered concrete-filled double skin steel tubular,TCFDST)构件的扭转受力全过程机理,该类构件扭矩-转角曲线可划分弹性、弹塑性、塑性强化和破坏4个受力阶段;阐明了关键因素对TCFDST构件极限扭矩和刚度的影响规律,其中空心率、钢材和混凝土强度与扭矩和刚度呈正相关,内、外钢管径厚比对扭矩和刚度呈负相关,轴压比小于界限值时与承载力和刚度呈正相关,反之呈负相关;提出了“双薄壁分层筒”理论用于计算TCFDST构件扭矩-转角全过程曲线;结合我国规范和文献有关扭转承载力计算公式,建立并验证了适用于圆锥形和直筒形中空夹层钢管混凝土构件抗扭承载力计算的分层积分法,分析了不同方法计算压扭相关性(N-T)曲线的差异性。研究结果可对大空心率、大锥度及超限径厚比的圆锥形中空夹层钢管混凝土构件在风电工程的工程应用提供有益参考依据。

Abstract

Aiming at the demand for torsional capacity of high-power offshore wind power supporting structure,the full-range torsional mechanism of tapered concrete-filled double skin steel tubular (TCFDST) members was examined under the large hollow 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,elastic-plastic,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 difference 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.

关键词

圆锥形中空夹层钢管混凝土构件 / 数值模拟 / 扭矩分配机制 / 分层积分法 / N-T曲线

Key words

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

引用本文

引用格式 ▾
王淑红,刘向宏,王建涛,孙清,张琳琳,李国强. 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[J]. 应用力学学报, 2025, 42(6): 1270-1283 DOI:10.11776/j.issn.1000-4939.2025.06.007

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基金资助

国家自然科学基金资助项目(51978570)

国网浙江省电力有限公司科技资助项目(5211JY220003)

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