RC受弯构件正截面极限承载力尺寸效应研究  

Study on Size Effect of Normal Section Ultimate Bearing Capacity of RC Flexural Members

作　　者：周宏宇[1] 李振宝[1] 杜修力[1] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《武汉理工大学学报》2011年第10期83-87,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金重点项目(50838001);科研基地-科技创新平台-青年科学研究创新平台项目(X1004012201001)

摘　　要：对13根共5个截面尺寸的钢筋混凝土梁开展尺寸效应试验研究,详细观察记录不同阶段的破坏过程,并采集相应截面弯矩、挠度、截面应变等试验数据。在研究尺度内,评价了混凝土材料抗压性能尺寸效应对极限承载力的影响,实测并推导了相关特征参数随试件尺寸的变化规律,基本验证了现阶段受弯构件正截面极限承载力计算理论的安全性。同时也发现,对于大尺寸受弯构件而言,规范对混凝土非均匀受压极限压应变的取值偏大;试件受压区混凝土材料的极限变形能力随试件尺寸增大而减小,鉴于承载能力极限状态下的破坏特征与之联系紧密,应该引起充分重视。This paper carries out experimental research on size effect of five different section size free beams. The total number of reinforced concrete specimens is 13. According to observing failure process in different phases and analyzing test date including section bending moment, deflection and sectional strain etc. In research scale, evaluating size effect on mechanical properties of concrete materials under compression zone in beams. Characteristic parameters are measured and derived with size changing, and safety of calculation theory about ultimate strength of flexural members is basically veri- fied. It is also found that code value of ultimate strain under non-uniform compression is bigger than test value in large- size flexural members. Ultimate deformation capacity of concrete materials under compression zone is becoming smaller with specimen size increasing. Due to failure characteristics in the state of ultimate bearing capacity have a closely link with it, this should been paid much attention.

关 键 词：受弯构件 抗弯性能 尺寸效应 试验研究 承载力计算 

分 类 号：TU375[建筑科学—结构工程]