海水海砂混凝土双K断裂参数的确定  

Determination of double K fracture parameters of seawater sea sand concrete

作　　者：臧朝会 杨树桐[1] 金亮亮 ZANG Chaohui;YANG Shutong;JIN Liangliang(Department of Civil Engineering, College of Engineering, Ocean University of China, Qingdao 266100, China)

机构地区：[1]中国海洋大学工程学院土木工程系

出　　处：《海洋工程》2019年第4期142-150,共9页The Ocean Engineering

基　　金：国家自然科学基金项目(51778591)

摘　　要：采用尺寸为515mm×100mm×100mm初始缝高比从0.1变化至0.8的三点弯曲梁试件,利用试验测得起裂荷载Pini、最大荷载Pmax及对应的裂缝口张开位移CMODc等参数,研究了缝高比a0/h对海水海砂混凝土双K断裂参数的影响。并以相同配合比的淡水河砂梁作为对照组,进一步研究了海砂海水混凝土双K断裂参数与普通混凝土之间的关系。结果发现海水海砂混凝土断裂参数在a0/h=0.25~0.7范围内时可以认为是一常数;海水海砂混凝土梁断裂参数比相同配合比情况下的淡水河砂梁大且对边界影响更加敏感。In this study, three-point bending tests are carried out on notched seawater sea sand concrete (SSC) beams with sizes of 100 mm × 100 mm×515 mm and initial notch-to-depth ratios a0 / h from 0.1 to 0.8.The initial cracking load P ini , maximum load P max and corresponding crack mouth opening displacement CMOD c are obtained from the tests.The effect of a0 / h on the double-K fracture parameters is analyzed.Moreover, tests on ordinary concrete (OPC) with the same mix proportion are performed for comparison.Results show that the fracture parameters of SSC almost keep constant when the a0 / h is from 0.25 to 0.7 and they are more sensitive to the boundary effects compared to those of OPC.

关 键 词：海水海砂混凝土 双K断裂参数 缝高比 配合比 断裂韧度 

分 类 号：P752[天文地球—海洋科学]