（1 湖南大学土木工程学院， 长沙 410082； 2 湖南大学风工程与桥梁工程湖南省重点实验室， 长沙 410082）

［摘要］为了考虑多参数耦合效应对无腹筋梁抗剪承载力的影响，并量化相应的计算公式，收集了美国混凝土协会（ACI）数据库和国内的一些试验数据，对数据进行筛选和处理。通过统计分析，确定了尺寸效应和纵筋配筋率对抗剪强度的影响规律。基于试验现象，提出了一种混凝土抗压强度和剪跨比符合的指数形式。采用这种指数形式，通过回归分析得到了考虑多参数耦合效应的抗剪承载力计算公式。该公式形式简单，可以反映混凝土强度、剪跨比、纵筋配筋率、有效高度的影响。与其他计算模型对比，该公式预测精度较好。

［关键词］无腹筋； 简支梁； 抗剪承载力； 尺寸效应； 统计分析

中图分类号：TU318， TU375文献标识码：A文章编号：1002-848X(2019)06-0086-06

Analysis of shear capacity of beams without web reinforcement considering multiple factors coupling

Li Lifeng1,2， Xu Kaiduo1， Hu Sicong1， Li Huihui1

（1 College of Civil Engineering， Hunan University， Changsha 410082， China；2 Provincial Key Laboratory of Wind Engineering and Bridge Engineering， Hunan University， Changsha 410082， China）

Abstract:In order to consider the coupling effect of multiple factors on shear  capacity of beams without web reinforcement, as well as to quantitate the corresponding prediction equation,  American Concrete Institute (ACI) experimental database and some domestic experimental datas were collected and then filtered and handled. Through statistical analysis, the influences of size effect and reinforcement ratio on shear strength were quantitated. Based on experimental observation, an exponential form of concrete compressive strength and shear span ratio was proposed. A related equation of shear  capacity, able to account for the coupling effect of multiple parameters, was derived via regression analysis with the exponential form. This equation, with a simple form, can account for the effects of concrete strength, shear span ratio, reinforcement ratio and effective depth. Compared with other calculation models, this equation shows a superior prediction accuracy.

Keywords:without web reinforcement; simply supported beam; shear  capacity; size effect; statistical analysis