Chemical Anchor Pullout Force Modeling with Variation of Anchor Embedment Length in Concrete and Concrete Strength

A. Rosyidah, Jasun Widiana Putra, Jonathan Saputra
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Abstract

The embedment length influences the adhesion between the cast iron material and the concrete. The concrete's compression strength also contributes to an increase in bond strength. Therefore, this research aims to determine the maximum pullout force on each variation of the anchor and the optimal embedment length. A gauge is modeled as a rod-type with a diameter of 16 mm, and the embedment lengths used are 5D, 10D, and 15D, while the compressive strengths include fc’ 20, 30, 40, 50, and 60 MPa. Furthermore, a finite element-based application was utilized with the ANSYS Workbench student version. The result showed that the concrete with strengths of 20, 30, 40, 50, and 60 MPa has maximum pullout forces of 27.011, 53.536, 68.657, 68.970, and 84.407 kN, respectively at an embedment length of 15D. It was observed that the failure pattern obtained starts from the defect in the concrete cone and ends with the breakage of reinforcement or steel failure at each variation of concrete strength. A combination of two non-parametric techniques was used in this research, which includes Kruskal Wallis and U-Mann Whitney test. The first technique revealed that the chi-square value for strengths 20, 40, 50, and 60 MPa is 9.486, while that of 30 MPa is 9.881. The second test employed showed a significance value below 0.05. In conclusion, the embedment length affected the value of pullout force, and 15D was the optimum embedment length for each variation of concrete strength. The enhancement in tensile strength increases with the strength of the concrete.
考虑混凝土锚杆埋置长度和混凝土强度变化的化学锚杆拔出力模型
埋置长度影响铸铁材料与混凝土的粘结性。混凝土的抗压强度也有助于增加粘结强度。因此,本研究的目的是确定锚杆各变形时的最大拉拔力和最优埋置长度。表的模型为杆型,直径为16mm,采用的埋设长度为5D、10D和15D,抗压强度为20mpa、30mpa、40mpa、50mpa和60mpa。在此基础上,利用ANSYS Workbench学生版开发了基于有限元的应用程序。结果表明:强度为20、30、40、50、60 MPa的混凝土在埋置长度为15D时,最大拉拔力分别为27.011、53.536、68.657、68.970、84.407 kN;在混凝土强度的每一次变化中,所得到的破坏模式从混凝土锥体缺陷开始,以钢筋断裂或钢筋破坏结束。本研究采用了Kruskal Wallis检验和U-Mann Whitney检验两种非参数技术的结合。结果表明,20、40、50、60 MPa强度的卡方值为9.486,30 MPa强度的卡方值为9.881。第二次检验的显著性值小于0.05。综上所述,预埋长度影响拉拔力值,15D为各混凝土强度变化的最佳预埋长度。抗拉强度的提高随混凝土强度的增加而增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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