多腔中空薄壁方钢管混凝土短柱轴压性能研究
作者:
作者单位:

西南石油大学 土木工程与测绘学院,成都 610500

作者简介:

张潇(1997—),男,硕士研究生,主要从事钢管混凝土力学性能方面的研究,(E-mail)289290215@qq.com。

通讯作者:

龚俊(1993—),男,博士,讲师,主要从事钢结构抗震和组合结构方面的研究,(E-mail)jun.gong@swpu.edu.cn。

中图分类号:

TU 398.9

基金项目:

四川省青年科技创新团队项目(2019JDTD0017);中国博士后科学基金(2022M722639);四川省自然科学基金(2023NSFSC0889)。


Axial compressive behavior of thin-walled multi-cavity concrete-filled double-skin (square inner and square outer) steel tubular stub columns
Author:
Affiliation:

School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, P. R. China

Fund Project:

Supported by the Scientific Innovation Group for Youths of Sichuan Province (2019JDTD0017), China Postdoctoral Science Foundation (2022M722639), and Natural Science Foundation of Sichuan Province, China (2023NSFSC0889).

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    摘要:

    为了提升中空夹层钢管混凝土(concrete-filled double-skin steel tubular,CFDST)短柱的轴压性能,提出并设计了薄壁方套方中空夹层多腔钢管混凝土(multi-cavity concrete-filled double-skin tubular,MCFDST)短柱,对其轴压力学性能进行了试验研究。试验试件包括15个方套方MCFDST短柱试件和3个方套方CFDST短柱试件。以混凝土抗压强度、外钢管宽厚比、空心率和是否设置拉肋为参数,通过分析试件的变形、荷载-位移曲线、破坏现象和延性系数,探究了各参数对试件的极限承载力、失效模式和延性的影响。试验结果显示:混凝土抗压强度从58 MPa提升至90 MPa,试件承载力提升46%,延性系数最高降低74%;外钢管宽厚比从39降低到29,试件承载力提升12.5%,延性系数明显增大;空心率从0.31增大到0.38,试件承载力提升了1.3%,延性系数仅提升1%;增设拉肋使构件承载力提升14.2%,延性系数最高提升282%。其次,利用试验数据验证了数值建模方法的有效性和模型的正确性,并开展了大量有限元参数分析,讨论了现行规范对该短柱轴压承载力的适用性,发现日本规范AIJ的预测公式可以精确估计MCFDST短柱轴压承载力。

    Abstract:

    To improve the axial performance of concrete-filled double-skin steel tubular(CFDST) stub columns, a novel thin-walled multi-cavity concrete-filled double-skin tubular(MCFDST) stub column was proposed. Experimental investigations were conducted to evaluate the axial compressive behavior of these columns. A total of fifteen MCFDST stub columns and three CFDST stub columns were designed and fabricated, with four key parameters examined: concrete compressive strength(CCS), width-to-thickness ratio(WTR) of the outer tube, hollow ratio(HR), and the presence of tensile ribs. The study assessed deformation, load-displacement behavior, damage patterns, and ductility coefficient to determine the ultimate bearing capacity, failure mode, and ductility performance of the columns. Experimental results show that increasing the CCS from 58 MPa to 90 MPa enhances the bearing capacity by 46%, while reducing the ductility coefficient by 74%. A decrease in WTR from 39 to 29 results in a 12.5% improvement in bearing capacity alongside a notable increase in ductility coefficient. The HR increase from 0.31 to 0.38 yields marginal improvements in bearing capacity(1.3%) and ductility coefficient(1.0%). Notably, the presence of tensile ribs significantly increases the bearing capacity and ductility coefficient by 14.2% and 282%, respectively. Moreover, the experimental data validated the effectiveness and accuracy of numerical modeling, which facilitated extensive finite element parameter analyses. The applicability of current design methods for predicting axial bearing capacity was also discussed, indicating that the prediction formula in Japanese standard AIJ is suitable for estimating the axial compressive bearing capacity of MCFDST stub columns.

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张潇,龚俊,邵永波,黄伟峰,李紫君.多腔中空薄壁方钢管混凝土短柱轴压性能研究[J].重庆大学学报,2025,48(2):86-101.

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  • 收稿日期:2024-01-25
  • 在线发布日期: 2025-03-04
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