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一、前言: 南京水电仪表厂从1961年开始仿制卡尔逊型混凝土应力计样品并在北京水电科学院结构材料所进行试验。在25厘米,30厘米直经混凝土试件中埋设应力计进行徐变试验时发现应力计不仅感受应力,而且感受非应力变形。应力计在恒载下随混凝土徐变而增加的应力读数为瞬时弹性应力的一倍以上。进口应力计也有类似情况。因此怀疑应力计原理存在问题。为了搞清混凝土非应力应变对卡尔逊应力计的影响,我们遵照毛主席教导:“只有在亲身参加变革现实的斗争中,才能暴露那种或那些事物的本质而理解它们。”进行了大型试件埋设混凝土应力计的徐变试验,研究混凝土徐变对应力计测值的影响。
First, the foreword: Nanjing Hydrometer Factory from 1961 imitation Carlson concrete stress meter samples and the Beijing Institute of Hydropower Science and Engineering Materials for testing. In 25 cm, 30 cm straight concrete specimens buried in the stress gauge creep test found that the stress gauge not only feel the stress, but also feel non-stress deformation. Stress readings increase with creep of concrete at constant load more than double the instantaneous elastic stress. Imported stress gauges have similar situations. Therefore, there are problems with the stress gauge theory. In order to find out the effect of non-stress-strain of concrete on the Carlson stress meter, we follow Chairman Mao’s teachings: “Only by participating in the real struggle for change can we understand the nature of those things or things.” Piece creep test of embedded concrete stress meter to study the effect of concrete creep on the stress measurement.