长期荷载作用对内配工字型钢方钢管混凝土轴压短柱力学性能影响

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (6): 122-130.

长期荷载作用对内配工字型钢方钢管混凝土轴压短柱力学性能影响

赵萌萌,史艳莉^*

兰州理工大学土木工程学院, 甘肃兰州 730050

收稿日期:2019-05-09 出版日期:2021-12-28 发布日期:2021-12-28
通讯作者: 史艳莉(1977-),女,河北涿州人,教授. Email:ceshiyl@163.com
基金资助:
国家自然科学基金(51768038),甘肃省高等学校协同创新团队项目(2018C-08)

Effect of long-term loading on mechanical behavior of square CFST columns with inner profiled I-shaped steel subjected to axial loading

ZHAO Meng-meng, SHI Yan-li

College of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2019-05-09 Online:2021-12-28 Published:2021-12-28

摘要/Abstract

摘要： 利用ABAQUS建立考虑长期荷载作用的内配工字型钢方钢管混凝土轴压短柱数值分析模型.通过与已有试验数据对比,验证建模方法的可行性.在此基础上对该类新型组合柱进行力学性能分析,同时与不考虑长期荷载作用的结果进行对比.最后,分析长期荷载比、混凝土强度、钢管含钢率、型钢含钢率等对长期荷载作用下构件变形和承载力的影响规律.结果表明:长期荷载使组合柱中钢管和型钢提前进入塑性屈服,增大组合柱达到极限承载力时二者与混凝土的接触应力,改善其对混凝土的约束作用,使组合柱极限承载力提高,对应应变增大.参数分析表明:混凝土强度提高增大了长期荷载对组合柱的影响,钢管含钢率和型钢含钢率的增加使长期荷载影响减弱.

关键词: 长期荷载, 方钢管混凝土柱, 内配工字型钢, 轴压, 力学性能

Abstract: A numerical analysis model of the CFST columns with inner profiled I-shaped steel subjected to long-term axial loadingwas established by ABAQUS. The model was verified by experimental results. Based on the model, the mechanical property of composite columns was analyzed and compared with those of the composite column without long-term loading. Finally, the effect of parameters on the creep deformation and bearing capacity of members was analyzed in terms of long-term load ratio, concrete strength, steel-bearing steel rate and steel-containing steel ratio. The results show that long-term loading causes the steel tube and inter profiled steel to enter plastic yield in advance, increases the contact stress between them and concrete when the composite column reaches the ultimate bearing capacity, and improves its restraint on concrete. The ultimate bearing capacity of composite columns increases under long-term loading and the corresponding strain increases. The parametric analysis shows that the increase of concrete strength increases the influence of long-term load on composite columns, while the increase of steel content of steel pipe and section steel reduces the influence of long-term loading.

Key words: long-term loading, concrete-filled square steel tubular columns, inner profiled I-shaped steel, axial loading, mechanical property

中图分类号:

TU398

赵萌萌,史艳莉. 长期荷载作用对内配工字型钢方钢管混凝土轴压短柱力学性能影响[J]. 兰州理工大学学报, 2021, 47(6): 122-130.

ZHAO Meng-meng, SHI Yan-li. Effect of long-term loading on mechanical behavior of square CFST columns with inner profiled I-shaped steel subjected to axial loading[J]. Journal of Lanzhou University of Technology, 2021, 47(6): 122-130.

参考文献

[1] 陈明杰.钢骨-钢管高强混凝土柱力学性能研究 [D].广州:华南理工大学,2014.
[2] 毛文婧,史艳莉,王文达.内配型钢圆钢管混凝土轴压短柱在不同含钢率下承载力分析 [J].工程力学,2017,34(S1):63-70.
[3] 王连广,赵同峰,李宏男.方钢管-钢骨高强混凝土偏压柱试验研究与理论分析 [J].建筑结构学报,2010,31(7):64-71.
[4] 王金鑫,翁尚斌,刘瑶,等.钢骨-方钢管混凝土偏压短柱力学性能的试验研究 [J].兰州理工大学学报,2011,37(4):139-144.
[5] 朱美春,刘建新,王清湘.钢骨-方钢管高强混凝土柱抗震性能试验研究 [J].土木工程学报,2011,44(7):55-63.
[6] 韩祎,王景玄.相邻两面受火的内配型钢钢管混凝土柱的耐火极限 [J].兰州理工大学学报,2018,44(4):142-147.
[7] 韩林海.钢管混凝土结构-理论与实践 [M].3版.北京:科学出版社,2016.
[8] 王文达,邹爱华,张鹏鹏.长期荷载作用下矩形钢管混凝土轴压短柱力学性能 [J].公路交通科技,2011,28(7):73-78.
[9] WANG Y Y,GENG Y,GIANLUCA R,et al.Time-dependent behavior of expansive concrete-filled steel tubular columns [J]. Journal of Constructional Steel Research,2011,67:471-483.
[10] MA Y S,WANG Y F.Creep of high strength concrete filled steel tube columns [J].Thin-Walled Structures,2012,53:91-98.
[11] HAN L H,HOU C,WANG Q L.Square concrete filled steel tubular (CFST) members under loading and chloride corrosion:Experiments [J].Journal of Constructional Steel Research,2012,71:11-25.
[12] LIU H,WANG Y X,HE M H,et al.Strength and ductility performance of concrete-filled steel tubular columns after long-term service loading [J].Engineering Structures,2015,100:308-325.
[13] 丁敏,汪友弟,代春辉,等.钢管混凝土轴心受压构件的徐变预测模型及其徐变性能分析 [J].工程力学,2017,34(6):166-177.
[14] 潘鑫,史艳莉,王文达.圆钢管混凝土偏压柱全寿命周期力学性能研究 [J].钢结构,2018,33(4):32-38.
[15] 李永进.考虑长期荷载作用影响时钢管混凝土柱的力学性能研究 [D].福州:福州大学,2009.
[16] ACI209R-92.Prediction of creep,shrinkage and temperature effects in concrete structures [S].Farmington Hills(MI),American Concrete Institute,Detroit,USA,1992.
[17] 李永进,廖宇飞.钢管混凝土中核心混凝土的徐变系数终值研究 [J].华东交通大学学报,2012,29(5):7-12.
[18] 林挺伟.脱空缺陷对长期荷载作用下圆钢管混凝土构件静力性能的影响研究 [J].建筑钢结构进展,2018,20(2):74-78.