预应力锚索框架梁内力计算简化方法

Simplified Method for Estimation Internal Force of Reinforced Concrete Frame with Prestressed Ground Anchors

预应力锚索框架梁支护体系在工程中的应用已经相当广泛,其具有许多独特的优点,但其设计计算过程复杂,计算工作量大,手算耗时费力,给设计人员带来了诸多不便。针对预应力锚索框架梁的内力计算,首先参照柱下十字交叉基础梁计算方法对纵、横梁节点力进行分配;然后在文克尔地基有限长梁解析解的基础上,利用叠加原理,得出了弹性地基梁在多个集中力作用下的内力及地基反力分布规律;最后,结合算例,探究了支护工程中的纵、横梁的位移分布特点,并总结了预应力锚索框架梁内力计算简化方法。以期为预应力锚索框架梁的计算提供参考。

Reinforced concrete frame with pre-stressed ground anchors has many advantages and therefore,it is widely used as the supporting structures in the engineering excavations.However,the design analysis of this system requires complicated hand calculations and is not efficient for the design engineers.This paper presents an improved hand calculation method for estimating of the internal force in the ground anchored reinforced concrete frame.The joint forces in the longitudinal and transverse beams are arbitrarily distributed;then based on the analytical solution for the finite beam on Winkler foundation and the superposition principles,the distribution of the internal force and the ground reaction of the beam on elastic foundation under the action of multiple concentrated forces is obtained.Finally,in the paper,the deformation characteristics of the ground anchored reinforced concrete frame system is evaluated and the simplified the internal force estimation method is summarized.