预应力锚索框架是一种新型的坡体加固防护技术。它安全稳定、轻巧美观，经济效益明显优于传统的重型支挡结构，近年来已广泛地运用于铁路公路水利等工程实际中。目前，对框架梁内力计算方法还没有相关的规范做出统一规定。同时，现有的计算方法往往都忽略掉框架与坡面之间强大的摩擦力引起的框架梁内力变化。所以，有必要讨论基底摩擦力对框架梁内力的影响。本文主要做的工作是： （1）讨论最佳锚固角的选取对框架梁基底摩擦力作用形式的影响。根据Mohr-Coulomb准则、锚索抗滑力计算公式及锚索框架梁应用与施工要求，确定最佳锚固角的计算方法，认为最佳锚固角应为俯角，其取值与坡角和滑面倾角有关，锚索与水平面的夹角一般在 之间，并由此得出基底摩擦力为静摩擦力且沿坡面方向向下的结论； （2）选用Winkler弹性地基模型来计算框架梁内力，并在此基础上，对强大基底摩擦力引起的框架梁应力重分布现象进行评估。在考虑摩擦力对框架梁内力的影响时，将框架梁拆分成横梁和竖肋，对其分别建立力学模型，并利用弹性力学推导出摩擦力对框架梁内力的影响公式； （3）利用推导出的摩擦力对框架梁内力的影响公式，得出考虑摩擦力后框架梁内力的变化规律：横梁内力沿某一方向增加；竖肋内力在锚索两侧分别出现增加区和减小区，并在坡底方向的悬臂梁段锚索处增加幅度最大，且随着悬臂梁长度增加而增大；横梁内力的增加幅度大于竖肋的增加幅度；当梁截面高度一定时，摩擦力对梁内力的影响随梁宽增加而减小，并且横梁内力的变化幅度较大，竖肋内力的变化幅度较小； （4）分析摩擦力扭矩对横梁配筋的影响时，需先判断是否要进行抗扭和抗剪承载力的计算，进而选择配置箍筋和抗扭纵筋的方式。

Prestressed anchor cable frame beam is a new technique about slope reinforcing and defending .It safe and steady ,light and beautiful ,and the economic benefit is superior to the traditional heavy-duty supporting structures obviously , and popularly applied in railway、highway and water conservancy project .At present ,there is no unified standard to provide the calculating method of the internal forces of the frame beam ,and the existing methods ignore the change of the internal force of the beam caused by the huge friction between the frame and the slope frequently .So ,it is necessarily to discuss the influence of friction under the frame to the internal forces of the anchor cable frame beam .The main contents of this thesis are : (1)The influence of the selection of the optimal anchor cable-angle to the action form of the friction under the frame is discussed .The calculating method of the optimal anchor cable –angle is confirmed by considering Mohr-Coulomb rule ,the computing formula of the anchor power and the request of the use and construction of the anchor cable frame .The anchor cable –angle should be the angle of depression between and generally ,relate to the slope angle and the inclination of failure face .It shows that the friction under the frame is the breakout friction ,and points to the bottom of the slope. (2)Winkler elastic foundation model is selected to calculate the internal force about the frame beam ,and on the basis of it ,estimate the afresh distributing of the beam stress caused by the friction . Split the frame as transverse beam and upright beam when calculating the influence of the friction ,then establish the mechanical model respectively ,and use the elasticity’s technology to deduce a formula about the effect of the friction to anchor frame beam. (3)Using the formula about the effect of the friction to anchor frame beam which has deduced to analyze the influence rule of the friction :for the transverse beam ,the internal force increases in some direction ;for the upright beam , the internal force increased and reduced segments appear beside the anchor alternately .And the biggest increase is on the point where having the anchor cable of the cantilever beam at the direction of the bottom of the slope ,and increases as the elongation of the cantilever beam ;the increase of the internal force of the transverse beam is bigger than the upright beam’s ;when the height of the section of the beam is stated ,the influence of the friction reduces as the increasing of the width of the beam ,and the range of the change of the transverse beam is bigger than the upright beam’s; (4) For analyzing the influence of the torque produced by the friction to the design of the steel bar ,whether calculating the load of tweaking and shearing resistance must be judged by the formula .Then selecting the design mode of the stirrup and torsion longitudinal reinforcement.