- 摘 要
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（1 湖南大學(xué)土木工程學(xué)院， 長沙 410082; 2 工程結(jié)構(gòu)損傷診斷湖南省重點實驗室， 長沙 410082）
［摘要］進(jìn)行了16根鋼筋混凝土無腹筋變截面懸臂梁試件集中荷載靜力試驗，實時量測了縱筋應(yīng)變、受壓區(qū)混凝土應(yīng)變和撓度，記錄了裂縫開展過程和破壞形態(tài)。結(jié)果表明，梁受剪承載力與受壓邊傾角、縱筋配筋率和懸挑端截面有效高度有明顯正相關(guān)性；受壓邊傾角越大，變截面梁受剪破壞截面的位置越靠近懸挑端。非線性有限元分析表明變截面梁抗剪機(jī)制可用拱效應(yīng)解釋?；谠囼灧治黾?7個試驗數(shù)據(jù)的統(tǒng)計分析，提出了反映受壓邊傾角對拱效應(yīng)影響的系數(shù)以及確定驗算截面位置的方法，建立了與中國規(guī)范公式銜接的變截面梁受剪承載力計算公式。
［關(guān)鍵詞］變截面梁； 受剪承載力； 拱效應(yīng)
中圖分類號：TU317-2, TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)02-0007-07
Experimental study on shear strength of haunched reinforced concrete cantilever beams without transverse reinforcement
Yu Dong1,2, Yi Weijian1,2
(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Engineering Structures Damage Diagnosis Key Laboratory of Hunan Province, Changsha 410082, China)
Abstract:Sixteen haunched reinforced concrete beams without transverse reinforcement were tested under concentrated load. Strain of longitudinal bars, strain of concrete in compression zone and deflection were measured, patterns of cracks and failure mode of the specimens were recorded. Test results show that shear capacity is positively correlated with the inclined angle of haunch, longitudinal reinforcement ratio and the effecitve height of cantiliever beam end; the larger the inclined angle of hauch is, the closer the cross section of the shear failure position is to the cantilever end. The nonlinear finite element analysis indicated that the shear mechanism of hauched beams can be explained by arch section. Based on analysis of tests and statistically analyzing 37 test results, a parameter considering the influence of inclined angle of haunch to arch action and a method of choosing the critical section were introduced. A new shear strength formula for haunched reinforced concrete beams was proposed which connect with Chinese code.
Keywords:haunched beam; shear capacity; arch action
*國家重點研發(fā)計劃重點專項（2016YFC0701400）,國家自然科學(xué)基金項目（51338004）。
作者簡介：余東，碩士，高級工程師，Email:nil_yu@126.com。
