折线配筋先张梁疲劳性能试验  

Fatigue behavior of pretensioned prestressed concrete beams with inclined strands

作　　者：汪小林[1] 刘立新[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]郑州大学土木工程学院,河南郑州450002

出　　处：《华中科技大学学报（自然科学版）》2010年第5期113-116,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

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

摘　　要：为研究折线配筋先张梁的疲劳受力性能,对2根折线配筋先张梁和1根后张有粘结预应力混凝土梁进行了等幅疲劳试验,并对未发生疲劳破坏的试验梁进行了静载试验,探讨疲劳加载对其剩余静载承载力的影响.试验结果表明,折线配筋先张梁疲劳破坏始于底部受拉非预应力钢筋的脆性断裂;疲劳加载过程中钢筋应变、混凝土应变、裂缝宽度、挠度均有不同程度的增长,呈现'三阶段'变化规律;前期的疲劳加载对试验梁受力性能影响较小,试验梁正截面受弯破坏,有明显的延性破坏特征,其承载力与现行规范计算值相比有一定的安全储备.Two pieces of pretensioned prestressed concrete beams with inclined strands were tested un- der the constant amplitude fatigue loading to investigate the fatigue behavior of pretensioned prestressed concrete beams with inclined strands. Aslo, by the static flexural experiment on two beams not fractured under fatigue loading, the effects of fatigue loading on the residual static bearing capaci- ty and corresponding performance were examined. Fatigue failure of the pretensioned prestressed con- crete beam started from the fracture of the tensile ordinary steel bars at the bottom of the beam, and the increment of reinforcement strain, concrete strain, crack width and deflection of the testing beams versus number of cycles basically conformed to the law of three-stages. Meanwhile, the static experi- mental results show that the early fatigue loading has little effect on the testing beams, which are sub- jected to the normal section flexural failure with significantly ductility, and the test bearing capacities have certain safety stock compared with the calculated results according to the current code.

关 键 词：预应力混凝土梁 先张法 折线配筋 疲劳 剩余静载承载力 

分 类 号：TU375.1[建筑科学—结构工程]