- 摘 要
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（1 大連理工大學(xué)土木水利學(xué)院，大連 116024； 2 成都基準方中建筑設(shè)計事務(wù)所，成都 610015；3 沈陽大學(xué)，沈陽 110044）
［摘要］通過對4根三分點加載方式下加固梁的抗彎靜力和疲勞試驗,研究了鋼纖維自應(yīng)力混凝土疊合層對加固梁的正截面疲勞性能影響。通過分析梁的開裂彎矩、跨中撓度、拉區(qū)鋼筋應(yīng)變以及梁裂縫的發(fā)展規(guī)律，考察了鋼纖維自應(yīng)力加固梁在彎曲重復(fù)荷載作用下的疲勞損傷過程。試驗結(jié)果表明, 鋼纖維自應(yīng)力混凝土疊合層可延緩加固梁的開裂，顯著降低裂縫寬度，明顯提高梁的疲勞性能，采用鋼纖維自應(yīng)力混凝土進行舊混凝土簡支梁橋變連續(xù)體系加固是一種有效的方法。
［關(guān)鍵詞］鋼纖維自應(yīng)力混凝土；加固梁；抗彎；疲勞性能
Experimental research on bend fatigue behavior of steel fiber reinforced self stressing concrete beams
Chen Xiaofeng1，2, Hu Tieming1,3，Huang Chengkui1(1 Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China； 2 Jizhun Fangzhong Architectural Design Associates，Chengdu 610015, China; 3 Shenyang University, Shenyang 110044, China）
Abstract:Based on the experimental results of four reinforced beams under fatigue loading with constant amplitudes,the effect of fatigue behavior of reinforced beams by steel fiber reinforced self-stressing reinforced concrete layer is studied.The course of damage of the beams is investigated by the load-deflection curves and crack propagations,as well as the strain variation for reinforcing steel bars. The results show that steel fiber reinforced self-stressing reinforced concrete layer can effectively inhibit surface cracking development,reduce the crack width and obviously improve the fatigue property of composite beams.It is an effective method that steel fiber reinforced self-stressing concrete is used in strengthening old concrete bridges to convert simple support beams into continuous support system.
Keywords:steel fiber reinforced self-stressing concrete; strengthened beam bend; fatigue behavior
作者簡介：陳小鋒，碩士研究生，Email:cxfdyq@163.com。
參考文獻
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