含直裂缝混凝土梁断裂过程区试验研究与分析  

Experimental study and analysis on fracture process zone of concrete beams with straight cracks

作　　者：童谷生[1] 鲁艳超 涂远鑫 TONG Gusheng;LU Yanchao;TU Yuanxin(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013

出　　处：《混凝土》2018年第9期45-49,共5页Concrete

基　　金：国家自科学基金项目(A020302;A020316);江西省教育厅科学技术研究项目(GJJ160474)

摘　　要：为了研究带预制裂缝的素混凝土梁在荷载作用下裂缝尖端微裂区扩展规律,采用三点弯曲梁试验方法借助于数字图像相关法观测混凝土的损伤、断裂过程。采用有限断裂力学模型和修正最大切应力准则分析不同缝高比及梁高对含裂缝的混凝土起裂荷载、极限荷载、断裂过程区及裂缝尖端名义应力的影响。试验结果与理论分析对比表明:两种理论模型预测的断裂过程区长度比较接近且与试验值有较好的相关性。In order to study the concrete beam with crack under the load of crack tip micro crack propagation zone,damage and fracture process of the test method of three point bending beam by means of digital image correlation method of observation of concrete.The effects of the ratio of the crack height and the height of the beam on the cracking load,the ultimate load,the fracture process zone and the nominal stress at the crack tip are analyzed by using the finite fracture mechanics model and the modified maximum shear stress criterion.The comparison between the experimental results and the theoretical analysis shows that the length of the fracture process zone predicted by the two theoretical models is close to that of the experimental values.

关 键 词：数字图像法 断裂过程区 有限断裂力学模型 修正最大切应力准则 名义应力 

分 类 号：TU528.01[建筑科学—建筑技术科学]