自密实混凝土双轴试验研究与强度准则分析  

Experimental Study and Strength Criterion Analysis of Self-compacting Concrete under Biaxial Loading

作　　者：张军[1] 曹大富[2] ZHANG Jun;CAO Da-fu(College of Civil Engineering and Architecture,Yangzhou Polytechnic Institute,Yangzhou 225009,China;College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]扬州工业职业技术学院建筑工程学院,扬州225009 [2]扬州大学建筑科学与工程学院,扬州225127

出　　处：《硅酸盐通报》2019年第11期3654-3662,共9页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51578478)

摘　　要：为探究自密实混凝土双轴力学性能,考虑不同侧向应力影响,应用岩石真三轴仪对自密实混凝土开展双轴压-压和双轴拉-压试验研究,通过试验得到不同加载工况自密实混凝土破坏形态和应力-应变曲线,同时引用普通混凝土双轴受力试验数据对比分析,通过研究主要得到以下结论:自密实混凝土双轴受力破坏形态和破坏机理与普通混凝土相类似,主应力方向应力-应变曲线发展趋势与侧向应力没有关系;受侧向压应力影响,双轴压-压作用下,自密实混凝土主压应力从36.62 MPa提高至59.17 MPa,平均提高幅度为55.78%,双轴拉-压作用下,自密实混凝土主拉应力从2.45 MPa降低至0.91 MPa,最大降低幅度为62.79%,与普通混凝土双轴受力试验数据对比,自密实混凝土双轴加载主应力受侧向压应力影响更为明显。同时,基于主应力空间和八面体空间应力提出了自密实混凝土双轴受力强度准则方程,所提出的强度准则方程具有较好的适用性。In order to explore the biaxial mechanical properties of self-compacting concrete,the biaxial compression-compression test and biaxial tension-compression test of self-compacting concrete were carried out considering different lateral stresses.The failure modes and stress-strain curves of self-compacting concrete under different loading conditions were obtained through the test.At the same time,the biaxial compression test data of ordinary concrete were used for comparative analysis.The main conclusions are as follows.Under the influence of lateral compressive stress,the main compressive stress of self-compacting concrete increases from 36.62 MPa to 59.17 MPa under the action of biaxial compression-compression,with an average increase of 55.78%.Under the action of biaxial tension-compression,the main tensile stress of self-compacting concrete decreases from 2.45 MPa to 0.91 MPa,with a maximum decrease of 62.79%.Compared with ordinary concrete,the principal stress of self-compacting concrete under biaxial loading is more obviously affected by lateral compressive stress.At the same time,based on the principal stress space and octahedron space stress,the strength criterion equation of self-compacting concrete under biaxial loading is proposed,which has good applicability.

关 键 词：自密实混凝土 双轴压-压 双轴拉-压 强度准则 

分 类 号：TU501[建筑科学—建筑技术科学]