一种可考虑形状效应的浅埋板锚极限抗拔力计算方法

现有的板锚极限抗拔力计算方法只考虑了常规形状锚板的情况,不适用于特殊形状的锚板。为了更好地指导工程实践,在总结已有研究的基础上,研究了圆形、方形、正三角形和风筝形锚板,假定锚板的破坏面从锚板的侧面以膨胀角向上延伸,形成与锚板自身具有相同横截面形状的棱台,结合数学和力学理论分析,提出了一种可以考虑形状效应的浅埋板锚极限抗拔承载力计算方法,并将简化方法计算所得承载力和公开试验结果进行对比。结果表明,简化计算方法适用于埋深与板宽之比小于5的浅埋情况,且具有较高的精度,可以在初步工程设计中加以应用。研究结果为多种形态的浅埋锚板极限抗拔力计算提供了新的方法,可为类似工程项目的设计提供参考,具有一定的工程借鉴价值。

A calculation method of ultimate pull-out force of shallow-buried plate anchors considering shape effect

The existing calculation method of the ultimate pull-out force of plate anchors only considers the regular shapes, which is not applicable to the special shapes. In order to better guide the engineering practice, the circular, square, equilateral triangle and kite-shaped anchor plates were studied based on the previous research, assuming that the failure surface extended upward from the side of the anchor plate at a specific expansion angle, which resulted in the same shape as the cross-section of the anchor plate. Combining with the particular mathematical and mechanical theoretical analysis,a calculation method taking the shape effects into account was proposed to analyze the ultimate pull-out force of shallow-buried plate anchors, from which the results were compared with the publicly available experimental data. The results show that this method has high accuracy when the ratio of the buried depth to the board width is less than 5, and can be applied in preliminary engineering design. The research results provide a new way for the calculation of the ultimate pull-out force of various shapes of shallow buried anchor plates, which can also offer a reference for the design of similar projects.