摘要
对6根铝合金配筋新型混凝土梁试件进行了单调静载试验,研究该类新型混凝土梁的破坏机理,分析铝合金配筋混凝土梁的破坏过程、荷载-跨中挠度曲线以及纵筋应变和弯曲裂缝等的变化规律。研究结果表明:铝合金配筋新型混凝土梁发生弯曲破坏和粘结破坏2种典型模式,其中受弯破坏模式表现为铝合金纵筋拉断失效或受压区混凝土压溃失效,粘结破坏模式主要由"拱机理"导致,表现为试件在支座处锚固破坏或斜截面混凝土剪压破坏;该类新型混凝土梁的极限荷载和名义屈服荷载非常接近,二者之比均小于1.15;发生弯曲破坏的铝合金配筋混凝土梁试件的荷载-跨中挠度曲线可分为弹性阶段、带裂缝工作阶段和破坏失效阶段。
According to the experiment investigation on six new type concrete beams reinforced with aluminum alloy bars under monotonic static loading , the failure mechanism of new type concrete beams was researched .The failure process ,load‐deflection curve ,longitudinal strain distribution and flexural crack development were analyzed .The study results indicate that there are two typical failure patterns of new type concrete beams reinforced with aluminum alloy bars ：flexural failure and bond failure .The flexural failure pattern always occurs with tensile rupture of aluminum alloy bars or crushing failure of concrete .Owing to the“arch action” ,the bond failure pattern always occurs with anchor failure of aluminum alloy bars at the supports or shear‐compression failure of concrete in shear‐compression zone .Moreover ,the ultimate load is quite near with the nominal yielding load of new type concrete beams reinforced with aluminum alloy bars ,the average ratio between the ultimate loads and the nominal yielding loads is less than 1 .15 .In addition ,the load‐deflection curves of flexural failure specimen can be divided into three stages：elastic stage ,crack stage and failure stage .
出处
《建筑科学与工程学报》
CAS
北大核心
2015年第1期35-41,共7页
Journal of Architecture and Civil Engineering
基金
国家杰出青年科学基金项目(50725824)
陕西省自然科学基础研究计划项目(2013JQ7023)
中国博士后科学基金项目(20110491651)
关键词
混凝土梁
铝合金
受弯性能
承载力
拱机理
破坏模式
静载试验
concrete beam
aluminum alloy
flexural behavior
bearing capacity
arch action
failure pattern
static experiment
