基于尺寸效应的无腹筋高强混凝土梁抗剪承载力研究  

Prediction of Shear Capacity of High-strength Concrete Beams Without Web Reinforcement Considering Size Effect

作　　者：夏璐[1] XIA Lu

机构地区：[1]安徽水利水电职业技术学院建筑工程学院,安徽合肥231603

出　　处：《安徽职业技术学院学报》2022年第3期20-27,共8页Journal of Anhui Vocational & Technical College

基　　金：安徽省2020年度高校科学研究项目“港股混凝土组合结构梁柱节点抗震性能研究”(KJ2020A1050)。

摘　　要：文章从断裂力学的裂缝粘结模型出发,通过对参数的回归分析推导出无腹筋高强混凝土梁抗剪承载力尺寸效应折减系数、纵筋配筋率系数和拱作用系数,提出了考虑尺寸效应、纵筋配筋率和拱作用的抗剪承载力计算公式。收集整理了311根无腹筋高强混凝土梁抗剪试验数据,通过对比本文计算公式与其他公式的抗剪承载力预测值,本文抗剪承载力计算公式能够准确地预测无腹筋高强混凝土梁抗剪承载力,并具有较高的预测精度和稳定性。Starting from the crack bonding model of fracture mechanics,this paper deduces the calcula⁃tion of size effect reduction coefficient,longitudinal reinforcement ratio coefficient and arch action coefficient of shear capacity of high-strength concrete beams without web reinforcement through the regression analysis of parameters,and puts forward the calculation formulas considering size effect,the ratio of longitudinal rein⁃forcement and arch action.The shear test data of 311 high-strength concrete beams without web reinforce⁃ment are collected,and the proposed calculation formula,and other formulas are analyzed and compared based on the test data.The results show that the proposed calculation formula of shear capacity of high strength concrete beams without web reinforcement considering size effect is simpler than other calculation formulas,can accurately calculate the shear capacity of high-strength concrete beams without web reinforce⁃ment,and has a high prediction accuracy and stability.

关 键 词：高强混凝土梁 抗剪承载力 尺寸效应 纵筋配筋率 拱作用 

分 类 号：TU375.1[建筑科学—结构工程]