严寒地区冻融混凝土内钢筋应力滑移模型及OpenSEES有限元模拟

硅酸盐通报 ›› 2020, Vol. 39 ›› Issue (12): 3844-3850.

严寒地区冻融混凝土内钢筋应力滑移模型及OpenSEES有限元模拟

吴伟^1,2, 冯虎³

1.黄河水利职业技术学院水利工程学院,开封 475004;
2.小流域水利河南省高校工程技术研究中心,开封 475004;
3.郑州大学土木工程学院,郑州 450001

发布日期:2021-02-01
作者简介:吴伟(1983—),男,讲师。主要从事土木工程施工技术、水利工程施工技术的研究。E-mail:wuwei1911@163.com
基金资助:
国家自然科学基金(51709125);西藏重点研发计划(XZ201901-GB-15);黄河水利职业技术学院青年骨干教师培养计划(2019HYGG07)

Stress-Slip Model of Steel Bar for Freeze-Thaw Concrete in Severe Cold Regions and OpenSEES Finite Element Simulation

WU Wei^1,2, FENG Hu³

1. College of Hydraulic Engineering, Yellow River Conservancy Technical Institute, Kaifeng 475004, China;
2. Engineering Technology Research Center of Small Watershed ConservancyUniversity of Henan Province, Kaifeng 475004, China;
3. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Published:2021-02-01

摘要/Abstract

摘要： 在严寒地区冻融混凝土与钢筋局部粘结滑移模型的基础上,基于冻融混凝土内钢筋沿锚固长度的受力机理分析及迭代过程分析,建立了冻融混凝土内钢筋应力滑移计算方法,提出了冻融混凝土内钢筋的应力滑移关系骨架曲线。基于有限元计算软件OpenSEES,将推导的冻融混凝土内钢筋应力滑移关系曲线嵌套于零长度截面单元,并将该单元应用于梁柱纤维模型,对3根既有的冻融钢筋混凝土框架柱进行模拟,与试验结果进行对比分析。结果表明,冻融钢筋混凝土柱有限元模型的模拟结果与试验结果的符合程度良好,从构件层次验证了推导的冻融混凝土内钢筋应力滑移关系曲线具有较好的精度和可靠性。研究成果可为严寒地区冻融混凝土内钢筋应力滑移推导及有限元模拟提供理论参考。

关键词: 冻融混凝土, 有限元模拟, 钢筋应力滑移, 零长度截面单元, 框架柱, 骨架曲线

Abstract: On the basis of the local bond-slip model of freeze-thaw concrete and steel bar in severe cold regions, based on the analysis of the force mechanism of steel bar along anchorage length in the freeze-thaw concrete and the analysis of the iterative process, a calculation method for the steel bar stress-slip in the freeze-thaw concrete was established. The skeleton curve of stress slip relationship for steel bar in freeze-thaw concrete was proposed. Then, based on the finite element calculation software OpenSEES, the deduced stress-slip curve of steel bar in the freeze-thaw concrete was nested in the zero-length section element, and the element was applied to the beam column fiber model. The three existing freeze-thaw reinforced concrete frame columns were simulated and then compared with the test results. The results show that the numerical results of the freeze-thaw reinforced concrete column finite element model are in good agreement with the test results. It is verified from the component level that the deduced stress-slip curve of steel bar in the freeze-thaw concrete has good accuracy and reliability. The research results provide a theoretical reference for the derivation and finite element simulation for the stress slip of steel bar in freeze-thaw concrete in severe cold regions.

Key words: freeze-thaw concrete, finite element simulation, steel bar stress slip, zero-length section element, frame column, skeleton curve

中图分类号:

TU375

吴伟, 冯虎. 严寒地区冻融混凝土内钢筋应力滑移模型及OpenSEES有限元模拟[J]. 硅酸盐通报, 2020, 39(12): 3844-3850.

WU Wei, FENG Hu. Stress-Slip Model of Steel Bar for Freeze-Thaw Concrete in Severe Cold Regions and OpenSEES Finite Element Simulation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3844-3850.

参考文献

[1] Berredjem L, Arabi N, Molez L.Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete[J].Construction and Building Materials, 2020, 246: 118421.
[2] 焦隽隽,朱俊锋.再生混凝土冻融损伤可靠性分析[J].硅酸盐通报,2020,39(4):1145-1152.
[3] 尹志刚,张恺,范巍,等.不同冻融介质作用下再生骨料透水混凝土耐久性试验研究[J].硅酸盐通报,2019,38(7):2137-2143.
[4] 李北星,钱兴,王凯.酸雨-冻融耦合侵蚀作用下混凝土性能劣化规律[J].硅酸盐通报,2019,38(11):3559-3564.
[5] Xu S H, Li A B, Wang H. Bond properties for deformed steel bar in frost-damaged concrete under monotonic and reversed cyclic loading[J]. Construction and Building Materials, 2017, 148: 344-358.
[6] 肖前惠,曹志远,关虓,等.冻融与硫酸盐侵蚀耦合作用下再生混凝土劣化规律[J].硅酸盐通报,2020,39(2):352-358.
[7] 刘传辉,吴婷.冻融条件下再生自密实混凝土力学性能试验研究[J].硅酸盐通报,2018,37(8):2640-2645.
[8] 曹芙波,尹润平,王晨霞.冻融损伤后再生混凝土与钢筋黏结滑移性能梁式试验研究[J].建筑结构学报,2017,38(4):141-148.
[9] Liu K H, Yan J C, Meng X X, et al. Bond behavior between deformed steel bars and recycled aggregate concrete after freeze-thaw cycles[J]. Construction and Building Materials, 2020, 232: 117236.
[10] Wang B X, Pan J J, Fang R C, et al. Damage model of concrete subjected to coupling chemical attacks and freeze-thaw cycles in saline soil area[J]. Construction and Building Materials, 2020, 242: 118205.
[11] Qiu W L, Teng F, Pan S S. Damage constitutive model of concrete under repeated load after seawater freeze-thaw cycles[J]. Construction and Building Materials, 2020, 236: 117560.
[12] 苏有彪,胡大琳,张航,等.碳化-冻融作用下钢筋混凝土梁承载力衰减分析[J].硅酸盐通报,2019,38(4):948-956.
[13] 郑捷,董立国,秦卿,等.冻融循环下钢筋混凝土框架梁柱中节点抗震性能试验研究[J].建筑结构学报,2016,37(10):73-81.
[14] Shang H S, Song Y P. Experimental study of strength and deformation of plain concrete under biaxial compression after freezing and thawing cycles[J]. Cement and Concrete Research, 2006, 36(10): 1857-1864.
[15] Duan A, Jin W L, Qian J R. Effect of freeze-thaw cycles on the stress-strain curves of unconfined and confined concrete[J]. Materials and Structures, 2011, 44(7): 1309-1324.
[16] Hasan M, Ueda T, Sato Y. Stress-strain relationship of frost-damaged concrete subjected to fatigue loading[J]. Journal of Materials in Civil Engineering, 2008, 20(1): 37-45.
[17] Yang W, Zheng S S, Zhang D Y, et al. Seismic behaviors of squat reinforced concrete shear walls under freeze-thaw cycles: a pilot experimental study[J]. Engineering Structures, 2016, 124: 49-63.
[18] Xu S H, Li A B, Ji Z Y, et al. Seismic performance of reinforced concrete columns after freeze-thaw cycles[J]. Construction and Building Materials, 2016, 102: 861-871.
[19] Liu K H, Yan J C, Alam M S, et al. Seismic fragility analysis of deteriorating recycled aggregate concrete bridge columns subjected to freeze-thaw cycles[J]. Engineering Structures, 2019, 187: 1-15.
[20] Seif Eldin H M, Galal K. Effect of reinforcement anchorage end detail and spacing on seismic performance of masonry shear walls[J]. Engineering Structures, 2018, 157: 268-279.
[21] Petersen L, Lohaus L, Polak M A, et al. Influence of freezing-and-thawing damage on behavior of reinforced concrete elements[J]. ACI Materials Journal, 2007, 104(4): 369-378.
[22] CEB-FIB Model-Code: Part I-III. Design code[M]. London: Thomas Telford, 1991.
[23] Zhao J, Sritharan S. Modeling of strain penetration effects in fiber based analysis of reinforced concrete structures[J]. ACI Structural Journal, 2007, 104(2): 133-141.
[24] Qin Q, Zheng S S, LI L, et al. Experimental study and numerical simulation of seismic behavior for RC columns subjected to freeze-thaw cycles[J]. Advances in Materials Science and Engineering, 2017, 2017: 1-13.