基于梁柱扭转效应的框架预应力锚杆柔性支护结构内力计算

Calculation of internal forces of framed flexible supporting structure with prestressed anchors based on torsional effects among beams and columns

针对现有计算模型中对框架梁柱底部地基反力分布假设的不足,提出利用杆系有限元,采用能够考虑地基与岩土体相互作用的Winkler弹性地基梁模型,并考虑框架梁柱的扭转效应,对边坡加固中的框架预应力锚杆柔性支护结构的框架梁柱进行内力计算.并对某工程实例进行计算,结果表明框架梁柱扭转的相互影响可以忽略;只要计算单元选取合理,将框架梁柱体系拆分为单梁后按连续梁进行内力计算也是可行的.

Aimed at the deficiency in hypothesis about foundation reaction force distribution made by the calculation model available, a method was proposed to calculate the internal forces of framed beams-columns structure with prestressed anchors for slope reinforcement. In this method a bar-system finite element and linear elastic Winkler model were used, so that the interaction between foundation beams and soils as well as the torsional effect among beams and columns could be taken into consideration. An engineering example was given to show the calculation with this method, and its result showed that the torsional effect among beams and columns could be ignored in internal forces calculation of the frame. So long as the calculating element was reasonably selected, it would be feasible to separate the frame system into a series of independent single beam whose internal forces could be calculated according to the theory of continuous beam.