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为完善大体积混凝土仿真应力计算以及确切了解混凝土徐变性质 ,设计研制了机电伺服混凝土双轴徐变仪 ,采用高精度位移传感器测量徐变变形 ,和传统的混凝土徐变测量仪器及方法做了对比 ;获得了混凝土双轴压缩徐变实验曲线 ,与单轴徐变曲线相比 ,早龄期混凝土双轴压缩徐变比单轴徐变小 30 %左右 ;测定了多轴徐变试件的强度 ,并比较了同龄期未受力的强度 ,研究了微观切片混凝土双轴压缩应力下裂缝发展情况 ,认为低应力水平下压缩徐变试件强度并不降低 ,低应力下压缩徐变变形并非以试件损伤为代价
In order to improve the simulation stress calculation of mass concrete and to know the concrete creep property exactly, the electromechanical servo concrete biaxial creep instrument was designed and developed, and the creep deformation was measured by high precision displacement sensor, which was compared with the traditional concrete creep measuring instrument and method. Compared with the uniaxial creep curves, the biaxial compressive creep of the early aged concrete is about 30% smaller than that of the uniaxial creep. The strength of the multiaxial creep specimen is measured, The strength of unstressed specimens under the same age was compared and the development of cracks under the biaxial compressive stress of micro-sectioned concrete was studied. It is concluded that the compressive and creep specimens under low stress level did not decrease in strength and the compressive and creep deformation under low stress was not tested At the expense of damage