石振明, 管圣功, 陈锡锋. 2011: 侧限条件对振弦式应力计在混凝土应力量测中的影响性研究. 工程地质学报, 19(4): 487-491.
    引用本文: 石振明, 管圣功, 陈锡锋. 2011: 侧限条件对振弦式应力计在混凝土应力量测中的影响性研究. 工程地质学报, 19(4): 487-491.
    SHI Zhenming, GUAN Shenggong, CHEN Xifeng. 2011: STUDY ON CONFINE CONDITIONS' INFLUENCE ON VIBRATING STRING STRESS METER MEASURING CONCRETE STRESS. JOURNAL OF ENGINEERING GEOLOGY, 19(4): 487-491.
    Citation: SHI Zhenming, GUAN Shenggong, CHEN Xifeng. 2011: STUDY ON CONFINE CONDITIONS' INFLUENCE ON VIBRATING STRING STRESS METER MEASURING CONCRETE STRESS. JOURNAL OF ENGINEERING GEOLOGY, 19(4): 487-491.

    侧限条件对振弦式应力计在混凝土应力量测中的影响性研究

    STUDY ON CONFINE CONDITIONS' INFLUENCE ON VIBRATING STRING STRESS METER MEASURING CONCRETE STRESS

    • 摘要: 通过在混凝土中直接埋设应力计和在量测区包裹橡皮泥后埋设应力计的对比试验,研究了振弦式钢筋应力计的侧限条件对混凝土应力测量结果的影响。试验结果表明:基于各截面上混凝土与应力计量测区钢筒的应变一致假定,振弦式应力计能较准确地测量混凝土的应力,但其测量值偏小; 采用橡皮泥包裹应力计量测区的柔性侧向约束条件与应力计标定时的自由边界条件更为相似,故其能更准确地测量混凝土的应力,但其准确度随荷载增加而有所减小; 将应力计直接埋设在混凝土里,由于受到混凝土的侧向约束作用,应力计钢筒的名义轴向刚度提高,故其测量值相应减小。

       

      Abstract: Through the comparison tests of embedding vibrating string stress meter in concrete,which is wrapped with and without plasticine at the measuring area,the confine conditions' influence on the outcomes of the stress meter was studied when it's measuring the stress of concrete.The results showed that: based on the assumption that on any cross section the strain of concrete and stress meter are the same,vibrating string stress meter can relatively accurately measure the stress of concrete,but the measured value is a little smaller than the real one; wrapped with plasticine at the measuring area,the stress meter's confine condition is laterally flexible which is more similar to the free boundary condition on which it's calibrated,thus it can measure the stress of concrete more accurately,but its accuracy decreases with the increase of load; when the stress meter is directly embedded in concrete,its nominal axial stiffness will be increased because of the lateral constraint of concrete,thus its measured value will be correspondingly smaller.

       

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