摘要
在细观层次上将全级配混凝土梁的跨中区域看作是由硬化水泥砂浆,粗骨料及两者间的粘结带构成的三相复合材料,采用位移控制的加载有限元程序对全级配混凝土梁的弯拉实验进行了数值模拟。数值试验结果表明:(1)对于同样尺寸的试件来说,三级配和四级配梁计算所得的极限荷载和抗弯强度基本接近。(2)对于同样级配的试件来说,截面尺寸大的梁计算所得的极限荷载远高于较小尺寸的极限荷载。(3)其它参数一定的情况下,粘结带抗拉强度每提高12.5%,全级配混凝土梁的极限荷载和抗弯强度提高约10%。
The mid-span area of fully-graded concrete beam is taken as a three-phase composite material composed of mortar, coarse aggregate and the interface between them on meso-level. The bending and rupturing tests of the fully-graded concrete beam are simulated using the displacement-controlled FEM. The test results show that： 1） the ultimate load and flexural strength of three-graded concrete beam is almost equal to that of four-graded concrete beam for the test sample with identical dimension; 2） the ultimate load of large size beam is higher than that of small size beam for the test sample with identical aggregate gradation; 3） under the constant condition of other parameters, the ultimate load and the flexural strength can be increased by about 10 % with the tensile strength of interface increasing by 12.5 %.
出处
《水利与建筑工程学报》
2008年第1期1-3,共3页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金资助项目(50325826
90510011)
北京市教育委员会科学技术与研究生建设项目资助(4700001401509)
北京市属市管高校人才强教计划资助项目(05004012200515)
关键词
全级配混凝土
弯拉试验
数值模拟
细观力学
fully-graded concrete
bending and rupturing test
numerical simulation
mesomechanics
作者简介
田瑞俊（1983-），男（汉族），内蒙古呼和浩特人，硕士研究生，主要从事大体积混凝土材料方面的研究。
