再生混凝土梁抗剪承载力的可靠指标分析

Reliability Index Analysis of Shear Capacity of Recycled Concrete Beams

基于《混凝土结构设计规范》(GB50010—2010)中混凝土梁抗剪承载力计算公式,考虑再生粗骨料的影响,采用验算点法对再生混凝土梁进行可靠指标分析,探究规范公式对再生混凝土梁的适用性,在此基础上主要研究再生混凝土取代率、剪跨比、配箍率对再生混凝土梁抗剪承载力可靠指标的影响。结果表明:再生混凝土梁的可靠指标随再生粗骨料取代率、剪跨比的增加而减小,随配箍率的增加而增加;在所选分析参数范围内,大部分再生混凝土梁可靠指标满足规范要求,将考虑再生粗骨料影响的规范公式应用于工程中是可行的。

Based on the calculation formula of shear capacity of concrete beams in Code for design of concrete structures(GB 50010—2010),the reliability index of recycled concrete beams was analyzed.In addition,the effect of recycled coarse aggregate was considered in the formula.The reliability index of recycled concrete beams was analyzed by checking calculation point method,and the applicability of the standard formula to recycled concrete beams is explored.On this basis,the influences of the replacement ratio,shear span ratio and stirrup ratio on the reliability index of shear capacity of recycled concrete beams were mainly discussed.The results show that the reliability index decreases with the increase of replacement ratio of recycled coarse aggregate and shear span ratio,and increases with the increase of stirrup ratio.Most of the reliability indexes of recycled concrete beams could meet the specification requirements within the range of selected analysis parameters.Therefore,it is feasible to apply the formula in engineering.