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（中國建筑科學(xué)研究院， 北京 100013）
［摘要］針對相關(guān)文獻(xiàn)提出的當(dāng)縱筋率較小且剪跨比較大的構(gòu)件，規(guī)范公式安全儲備較小甚至不足的情況，首先對我國規(guī)范抗剪計(jì)算公式的由來進(jìn)行了梳理，然后對規(guī)范公式基于的試驗(yàn)數(shù)據(jù)庫進(jìn)行了統(tǒng)計(jì)分析，最后采用拉壓桿理論推導(dǎo)出一個抗剪承載力計(jì)算公式?；谠囼?yàn)數(shù)據(jù)和理論驗(yàn)證了相關(guān)文獻(xiàn)的結(jié)論；得出了規(guī)范公式在計(jì)算縱筋率較小的梁抗剪承載力的安全儲備比計(jì)算縱筋率較大的梁要低，在計(jì)算剪跨比較大的梁的抗剪承載力的安全儲備比計(jì)算剪跨比較小的梁要低；提出了在抗剪公式中，縱筋配筋率對抗剪承載力影響明顯，應(yīng)顯式表達(dá)。
［關(guān)鍵詞］混凝土無腹筋梁； 抗剪承載力； 剪跨比； 縱筋配筋率； 安全儲備
中圖分類號：TU375-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)12-0094-04
Study on calculation of bearing capacity of oblique section of concrete beams without web reinforcement based on experimental data and theory
Zhang Dilong, Di Xiaotan
（China Academy of Building Research, Beijing 100013, China）
Abstract:According to the related papers, the safety reserve of the standard formula is small or even insufficient when the longitudinal reinforcement ratio is small and the shear span ratio is relatively large. Firstly, the origin of the shear calculation formula in China′s code was sorted out, and then the statistical analysis of the code formula based on the experimental database was carried out. Finally, a shear bearing capacity calculation formula was deduced by using the strut-and-tie theory. Based on the experimental data and theory, the conclusions of relevant literatures were verified. It is concluded that the safety reserve for calculating the shear capacity of beams with lower longitudinal reinforcement ratio is lower than that of beams with larger longitudinal reinforcement ratio, and the safety reserve for calculating the shear capacity of beams with larger shear span ratio is lower than that of beams with smaller shear span ratio. In the shear formula, the ratio of longitudinal reinforcement has obvious influence on shear capacity, which should be expressed explicitly.
Keywords:concrete beam without web reinforcement; shear bearing capacity; shear span ratio; longitudinal reinforcement ratio; safety reserve
作者簡介：張狄龍，博士研究生，高級工程師，Email:zhangdilong@163.com。
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