截面預(yù)裂的RC構(gòu)件直剪與斜剪承載力比較*
林峰，歐智星，盧海霞
- 摘 要
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（同濟(jì)大學(xué)土木工程學(xué)院建筑工程系， 上海 200092）［摘要］鋼筋混凝土構(gòu)件截面中若存在與剪力方向平行的裂縫，則構(gòu)件的直剪承載力顯著降低。目前我國(guó)規(guī)范未進(jìn)行直剪設(shè)計(jì)或驗(yàn)算，可能存在安全隱患。為說(shuō)明此問(wèn)題，進(jìn)行了試驗(yàn)和分析研究。設(shè)計(jì)22個(gè)具有不同的貫通裂縫長(zhǎng)度、直剪配筋率和直剪鋼筋位置的Z形試件，得到了其直剪極限承載力。結(jié)果顯示，直剪極限承載力隨裂縫長(zhǎng)度的增大而減小，但基本不受鋼筋布置位置的影響。采用分析的方法并考慮可靠度近似一致，獲得了與直剪面具有相同材料和幾何特征但不同配箍率的構(gòu)件斜剪極限承載力。在極限承載力和承載力設(shè)計(jì)值兩個(gè)層面上，比較直剪和斜剪承載力。研究發(fā)現(xiàn)，若截面存在貫通裂縫、箍筋配筋率較大（大于0.18%）而直剪鋼筋較少（小于0.60%）時(shí)，需要進(jìn)行直剪承載力驗(yàn)算以保證設(shè)計(jì)安全。［關(guān)鍵詞］直剪; 斜剪; 極限承載力; 試驗(yàn)研究; 設(shè)計(jì)方法中圖分類(lèi)號(hào)：TU375 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2014)19-0075-06Comparison on the ultimate bearing capacities of direct shear and oblique shear for RC members with pre-cracked sectionsLin Feng, Ou Zhixing, Lu Haixia(Department of Building Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China)Abstract: The ultimate bearing capacities (UBCs) of direct shear for reinforced concrete (RC) members can be remarkably reduced due to the presence of the cracks parallel to the shear force. The current design codes in China do not provide an appropriate approach to design or check the UBCs of direct shear, which may have hidden danger. To demonstrate this irrationality, experimental and analytical studies were conducted. Twenty-two Z-shaped specimens with different crack lengths, reinforcement ratios and direct reinforcement positions were tested to obtain their UBCs of direct shear. The results show that the UBCs decrease when the crack lengths increase, but the UBCs of direct shear are not affected by the reinforcement positions. Considering the approximately identical reliability with the method of analysis, the UBCs of oblique shear with various stirrup ratios were obtained with the same material and geometric features as the direct shear specimens. By comparing the UBCs of direct shear with those of oblique shear in two perspectives of the ultimate bearing capacity and the design value of bearing capacity, it is found that the failure of direct shear occurs prematurely in certain situations of throughout cracking, stirrup ratio more than 0.18% and longitudinal reinforcement ratio less than 0.60%.Keywords: direct shear; oblique shear; ultimate bearing capacity; experimental study; design method*同濟(jì)大學(xué)土木工程學(xué)院光華基金課題。作者簡(jiǎn)介：林峰，博士，副教授，Email: lin_feng@#edu.cn。參考文獻(xiàn)［1］ROSST J. Direct shear failure in reinforced concrete beams under impulsive loading ［R］. Air Force Weapon Laboratory, Kirtland Air Force Base, 1983.［2］The joint ASCE-ACI Task Committee 426. The shear strength of reinforced concrete members ［J］. Journal of the Structural Division, 1973, 99(6):1091-1187.［3］BIRKELAND P W, BIRKELAND H W. Connections in precast concrete construction ［J］. 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