长细比对全长灌浆锚固系统抗拔性能的影响分析

Analysis of the Influence of Slenderness Ratio on the Pullout Resistance of Fully Grouted Anchorage System

随着我国经济的飞速发展,国家对节能减排、低碳环保提出了更高的要求。工程经验表明,长细比对细长受力构件的承载性能有较为明显的影响。本文基于经济、节能的目的,提出了单位体积极限抗拔力和最优长细比等概念,采用PFC软件建立了全长灌浆锚固系统计算分析模型,从锚固长度和锚固宽度两个维度的变化,系统地研究了长细比对全长灌浆锚固系统抗拔性能的影响。研究表明:(1)长细比直接影响着全长灌浆锚固系统的抗拔性能;(2)对于特定条件下的全长灌浆锚固系统来说,存在一个最优长细比,能够达到使用最少的材料来发挥最大承载力的目的;(3)二维模型下有关长细比对全长灌浆锚固系统抗拔性能的影响研究结论,同样适用于三维模型或真实工况下。

With the rapid development of China's economy,the country has put forward higher requirements for energy conservation,emission reduction,and low-carbon environmental protection.Engineering experience has shown that the slenderness ratio has a significant impact on the load-bearing performance of slender load-bearing components.For the purpose of economy and energy conservation,concepts such as the ultimate pull-out force per unit volume and the optimal slenderness ratio were proposed.A calculation and analysis model for the fully grouted anchorage system was established using PFC software.The influence of slenderness ratio on the pull-out performance of the fully grouted anchorage system was systematically studied from the changes in anchorage length and anchorage width dimensions.Research has shown that:(ⅰ)The slenderness ratio directly affects the pull-out performance of the fully grouted anchorage system;(ⅱ)For a fully grouted anchorage system under specific conditions,there exists an optimal slenderness ratio that can achieve the goal of using the least amount of material to maximize bearing capacity;(ⅲ)The research conclusion on the influence of slenderness ratio on the pull-out performance of the fully grouted anchorage system under two-dimensional models is also applicable to three-dimensional models or real working conditions.