- 摘 要
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（1 湖南大學土木工程學院， 長沙 410082； 2 湖南大學風工程與橋梁工程湖南省重點實驗室， 長沙 410082）
［摘要］為了考慮多參數(shù)耦合效應(yīng)對無腹筋梁抗剪承載力的影響，并量化相應(yīng)的計算公式，收集了美國混凝土協(xié)會（ACI）數(shù)據(jù)庫和國內(nèi)的一些試驗數(shù)據(jù)，對數(shù)據(jù)進行篩選和處理。通過統(tǒng)計分析，確定了尺寸效應(yīng)和縱筋配筋率對抗剪強度的影響規(guī)律。基于試驗現(xiàn)象，提出了一種混凝土抗壓強度和剪跨比符合的指數(shù)形式。采用這種指數(shù)形式，通過回歸分析得到了考慮多參數(shù)耦合效應(yīng)的抗剪承載力計算公式。該公式形式簡單，可以反映混凝土強度、剪跨比、縱筋配筋率、有效高度的影響。與其他計算模型對比，該公式預測精度較好。
［關(guān)鍵詞］無腹筋； 簡支梁； 抗剪承載力； 尺寸效應(yīng)； 統(tǒng)計分析
中圖分類號：TU318， TU375文獻標識碼：A文章編號：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
*交通運輸部科技項目（2013318798320），湖南省交通廳科技項目（201123，201219），陜西省交通廳科技項目（NO.12-21K）。作者簡介：李立峰，博士，教授，Email: lilifeng@hnu.edu.cn。
