混凝土立方体与圆柱体劈裂抗拉强度尺寸效应研究  

Size effect on tensile splitting strength of concrete cubes and cylinders

作　　者：周红[1,2] 车轶[1,2] 陈庚 宋玉普[1,2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116023 [2]大连理工大学建设工程学部,辽宁大连116023

出　　处：《混凝土》2010年第8期13-15,20,共4页Concrete

基　　金：国家自然科学基金重点项目资助(50838001);国家自然科学基金资助项目(50778034)

摘　　要：进行了尺寸为150 mm至750 mm的立方体和尺寸为150 mm至550 mm的圆柱体试件劈裂抗拉试验,试验中保持垫条宽度与试件尺寸比值不变以消除垫条宽度对不同尺寸试件试验结果产生的影响差异。建立了基于Weibull统计强度理论的混凝土劈裂抗拉强度尺寸效应计算公式,并讨论了骨料粒径对尺寸效应的影响。研究表明:该公式与试验数据吻合良好,能较好地预测不同尺寸普通混凝土试件的劈裂抗拉强度,最大骨料粒径为150 mm的全集配混凝土的劈裂抗拉强度比普通混凝土表现出更明显的尺寸效应。Tensile splitting tests on cubic specimens with sizes ranging from 150 mm to 750 mm and cylindrical specimens with sizes ranging from 150 mm to 550 mm were conducted,and the effect of width of bearing strips on tensile splitting strength of specimens were normalized by keeping the ratios of strip width to specimen size constant.The size effect equation on concrete tensile splitting strength based on Weibull statistical strength theory was developed,and the influence of aggregate size on size effect was investigated.It is shown that the presented equation agrees well with test data and predicts the tensile strength of specimens with different sizes with a good accuracy.Full mix concrete with maximum aggregate size of 150 mm shows more noticeable size effect on tensile splitting strength than ordinary concrete.

关 键 词：混凝土 劈裂抗拉强度 尺寸效应 

分 类 号：TU528.01[建筑科学—建筑技术科学]