（1 大连理工大学土木水利学院，大连 116024； 2 成都基准方中建筑设计事务所，成都 610015；3 沈阳大学，沈阳 110044）
［摘要］通过对4根三分点加载方式下加固梁的抗弯静力和疲劳试验,研究了钢纤维自应力混凝土叠合层对加固梁的正截面疲劳性能影响。通过分析梁的开裂弯矩、跨中挠度、拉区钢筋应变以及梁裂缝的发展规律，考察了钢纤维自应力加固梁在弯曲重复荷载作用下的疲劳损伤过程。试验结果表明, 钢纤维自应力混凝土叠合层可延缓加固梁的开裂，显著降低裂缝宽度，明显提高梁的疲劳性能，采用钢纤维自应力混凝土进行旧混凝土简支梁桥变连续体系加固是一种有效的方法。
［关键词］钢纤维自应力混凝土；加固梁；抗弯；疲劳性能
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
作者简介：陈小锋，硕士研究生，Email:cxfdyq@163.com。
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