Ⅰ型裂纹的高强混凝土梁断裂性能试验研究  

Experimental Study on Fracture Behavior of High-strength Concrete Beams with ModeⅠCracks

作　　者：徐玉萍[1] 杨丽娟 鲁艳超 XU Yu-ping;YANG Li-juan;LU Yan-chao(Transportation College,East China Jiaotong University, Nanchang 330013, China;Economics and Management College,East China Jiaotong University, Nanchang 330013, China;Qingdao Branch of Shangdong Provincial Architectural Design Institute, Qingdao 266000, China)

机构地区：[1]华东交通大学交通运输学院,南昌330013 [2]华东交通大学经济管理学院,南昌330013 [3]山东省建筑设计研究院青岛分院,青岛266000

出　　处：《科学技术与工程》2020年第12期4846-4852,共7页Science Technology and Engineering

基　　金：江西省高校人文社会科学规划基金(18J16);南昌市高校人文社会科学规划基金(JJ201802)。

摘　　要：为了研究Ⅰ型裂纹高强混凝土梁在静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。结合双K、双G理论模型分析不同初始缝高比对高强混凝土起裂荷载、失稳荷载、断裂韧度及应力强度因子的影响。试验结果表明:缝高比对起裂荷载与失稳荷载有较大的影响;双K、双G模型得出的起裂韧度理论值很接近且初始缝高比对断裂韧度无明显影响。In order to study the propagation law of crack tip micro-crack area under static load of mode I crack high strength concrete beam,a three-point bending beam test method was adopted.The effects of different initial height ratios on crack load,instability load,fracture toughness and stress intensity factors of high strength concrete were analyzed.The test results show that the ratio of seam height has a great influence on the crack load and the instability load.The theoretical values of crack toughness obtained by the double K and double G models are very close,and the initial seam height ratio has no significant effect on fracture toughness.

关 键 词：断裂模型 高强混凝土 断裂韧度 应力强度因子 

分 类 号：TU528[建筑科学—建筑技术科学]