混凝土用建筑锚栓(膨胀型)拉伸性能分析

Analysis on the tension performance of anchors (expansion anchors) in concrete

对埋置于混凝土中的膨胀摩擦型锚栓进行拉伸试验，利用加设虚拟力的方法和叠加法，对混凝土体内受集中力作用时的应力状态进行弹性分析，得出半无限体体内受集中力作用时应力分布的极坐标近似解析解及主应力的方向。通过弹性分析结合修正的莫尔库仑材料破坏准则，确定了埋置于混凝土中的膨胀摩擦型锚栓在轴向拉力作用下的弹性极限荷载，利用极限平衡得出拉伸极限荷载的计算公式。

In this article, the expansion anchors embedded in the concrete and subjected to the concentrated tension load are studied. By means of adding and applying virtual force, we derived the stress distribution in polar coordinates with a concentrated tensile force in a semi-infinite body, and got the direction of principal stresses. We also obtained the elastic ultimate load of the expansion anchors embedded in concrete under tensile axial load and by using Modified Mohr-Coulomb material failure criterion and ultimate equilibrium equation.