混凝土梁的断裂能及其尺寸效应的试验研究  

Experimental study on fracture energy and size effect of concrete based on three point bending tests

作　　者：赵艳兵[1] 陈红鸟[1] 陈嘉健[2] ZHAO Yanbing CHEN Hongniao CHEN Jiajian(Space Structures Research Center, Guizhou University, Guiyang, 550003, China Department of Civil Engineering, Foshan University, Foshan, Guangdong,528000 China)

机构地区：[1]贵州大学空间结构研究中心,贵州贵阳550003 [2]佛山科学技术学院土木工程系,广东佛山528000

出　　处：《贵州大学学报（自然科学版）》2016年第4期100-103,共4页Journal of Guizhou University:Natural Sciences

基　　金：混凝土的拉伸软化曲线及其尺寸效应研究(51408144);改性工业废弃石膏材料力学性能研究(X131001);蜂窝型钢空腹夹层板的刚度及其应用的研究(2016001)

摘　　要：为研究混凝土断裂性能及试件尺寸对其断裂能的影响,对含有预制切口的混凝土试件梁进行三点弯曲试验。试验采用线性位移传感器(Linear Variable Differential Transformers,LVDTs)测量试件梁跨中挠度δ,利用荷载-挠度曲线(P-δ)计算其断裂能。试验结果表明:同种尺寸试件梁的P-δ曲线会表现一定的差异性,但总体比较接近;不同尺寸试件梁的P-δ曲线性质相似,但是试件尺寸越大,P-δ曲线峰值越高。此外,混凝土断裂能表现出一定的尺寸效应,试件尺寸越大,断裂能越高。In order to study the fracture energy of concrete and its size effect,three point bending tests on prenotch concrete beams was carried out. Linear Variable Differential Transformers（ LVDTs） were used to measure mid-span deflection of the beam in the tests. Experimental results show that the P-δ curves of specimens with the same size are similar. The load-deflection（ P-δ） curves of specimens with different sizes have similar shape while the peak loads increase as the increase of the specimen sizes. In addition,the fracture energies of concrete show size effect and increase as the increase of specimens sizes.

关 键 词：混凝土梁 三点弯曲 断裂能 荷载-挠度曲线 尺寸效应 

分 类 号：TU528[建筑科学—建筑技术科学]