混凝土弯曲疲劳累积损伤性能研究  

A Study on the Cumulative Damage to Plain Concrete due to Flexural Fatigue

作　　者：李永强[1,2] 车惠民[1,2] 

机构地区：[1]铁道部科学研究院 [2]西南交通大学

出　　处：《中国铁道科学》1998年第2期52-59,共8页China Railway Science

摘　　要：本文在室内混凝土试件弯曲疲劳试验的基础上，研究了素混凝土受弯试件在变幅重复荷载作用下的弯曲疲劳累积损伤性能。在对试验结果分析的基础上，证明了变幅疲劳荷载的大小和加载顺序对混凝土弯曲疲劳破坏有较大的影响，当疲劳荷载由小变大时，累积损伤量大于１，当疲劳荷载由大变小时，累积损伤量小于１，Ｐ—Ｍ线性累积损伤准则不适于混凝土弯曲疲劳破坏。This paper studied the fatigue properties of plain concrete under variable amplitude flexural cyclic loading.The present experimental study indicates that the fatigue failure of concrete is greatly influenced by the magnitude and sequence of applied variable amplitude fatigue loading.The sun of the cumulative damage is found to be greater than 1 when the magnitude of fatigue loading is gradually increased and less than 1 when the magnitude of fatigue loading is gradually decreased.It is seen that the linear damage theory proposed by Palmgren and Miner is not directly applicable to concrete under such loading cases.The proposed nonlinear damage theory allows experimental fatigue analysis of concrete specimens.

关 键 词：混凝土 弯曲疲劳 累积损伤 试验 

分 类 号：TU528.07[建筑科学—建筑技术科学]