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在深基坑支护结构设计中,经常需要设置锚杆以抵抗支护结构受到的侧向压力作用。锚杆多数与水平线呈一定夹角而成斜锚杆,在分析中一般只考虑锚杆的水平作用。若对锚杆进行张拉,该预张拉力在水平方向的分力是不难求得的。然而,为了解决锚杆与支护结构的变形协调问题,则必须考虑锚杆的水平向刚度系数。 如图1所示,锚杆1与水平线夹角为α,其弹性模量、横截面积和计算长度分别是E、A及L,则由下式可以求得锚杆1的轴向
In the design of supporting structures for deep foundation pits, anchor rods are often required to resist the lateral pressure exerted by the supporting structures. Most of the anchor bolts are inclined angles with the horizontal line. In the analysis, only the horizontal action of the bolts is generally considered. If the anchor rod is tensioned, the component force of the pretensioning force in the horizontal direction is easily obtained. However, in order to solve the problem of deformation coordination between the bolt and the supporting structure, the horizontal stiffness coefficient of the bolt must be considered. As shown in Fig. 1, the angle between the anchor rod 1 and the horizontal line is α, and the elastic modulus, cross-sectional area, and calculated length are E, A, and L, respectively. From the following formula, the axial direction of the anchor rod 1 can be obtained.