疲劳加载后预应力混凝土梁受力性能试验研究  

Experimental Study on Performance of Prestressed Concrete Beams after Fatigue Loading

作　　者：汪小林[1] 刘立新[2] 于秋波[3] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]郑州大学土木工程学院,河南郑州450002 [3]郑州大学综合设计研究院,河南郑州450002

出　　处：《昆明理工大学学报（理工版）》2010年第1期52-55,共4页Journal of Kunming University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(项目编号:50578148);河南省交通厅计划资助项目(项目编号:2005P338)

摘　　要：通过对2根经250万次疲劳加载而未破坏的预应力混凝土梁进行静载受弯试验,研究疲劳加载对其剩余静载承载力、钢筋应力、刚度及裂缝等影响.试验结果表明,前期的疲劳加载对试验梁受力性能影响较小,各试验梁均发生正截面受弯破坏,破坏时有明显的延性破坏特征,并且其承载力与现行规范计算值相比有一定的安全储备.为评估既有预应力混凝土桥梁的受力性能及寿命提供一定的参考.By the static flexural experiment on the two prestressed concrete beams, which have not fractured under 2.5 million times of fatigue loading, the effects of fatigue loading on the residual static bearing capacity, re- inforcement stress, rigidity and crack width are studied. The experimental results show that the early fatigue loading has little effect on the testing beams, which fits in with the flexural failure model with significantly ductil- ity, and the test bearing capacities have certain safety stock compared with the calculated results according to the current code. The experimental results also provide some references for the performance and fatigue residual life estimation of the existing prestressed concrete bridges.

关 键 词：疲劳荷载 预应力混凝土梁 受力性能 静载 

分 类 号：TU375.1[建筑科学—结构工程]