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Investigation of a combined failure mode for screw anchors under tension
Advances in Structural Engineering ( IF 2.6 ) Pub Date : 2020-05-29 , DOI: 10.1177/1369433220924795
Zhao Chen 1 , Somayeh Nassiri 2 , Anthony Lamanna 3
Affiliation  

A modified concrete capacity design method is available to predict the ultimate tensile strength (Nu ) of screw anchors. Screw anchors commonly fail in a combination of concrete breakout and pullout modes. This combined mode is not distinguished from the breakout mode in the modified concrete capacity design method, which may cause confusions to designers. To investigate the Nu of the combined mode (Ncomb ), this study included 144 unconfined tension tests on screw anchors from three manufacturers in three diameters and two effective embedment depths (hef ) per diameter. Approximately 80% of the tested anchors failed in the combined mode. The differences in Ncomb among the three manufacturers were insignificant despite their varied thread design. Ncomb was found to be linearly correlated to the parameter hef 1.3 but was found independent of the anchor diameter. A regression model was developed to specifically predict Ncomb . The model showed a good fit with the test results.

中文翻译:

螺旋锚杆受拉复合破坏模式研究

一种改进的混凝土承载力设计方法可用于预测螺旋锚栓的极限抗拉强度 (Nu )。螺钉锚通常会在混凝土破裂和拉出模式的组合中失效。这种组合方式与改良混凝土容量设计方法中的分块方式没有区别,容易给设计者造成混淆。为了研究组合模式 (Ncomb) 的 Nu,本研究包括对来自三个制造商的螺钉锚栓进行 144 次无侧限拉伸试验,测试结果为三个直径和每个直径的两个有效嵌入深度 (hef)。大约 80% 的测试锚在组合模式下失败。尽管螺纹设计各异,但三个制造商的 Ncomb 差异并不显着。发现 Ncomb 与参数 hef 1 线性相关。3 但发现与锚直径无关。开发了一个回归模型来专门预测 Ncomb 。该模型显示出与测试结果的良好拟合。
更新日期:2020-05-29
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