侧限条件对振弦式应力计在混凝土应力量测中的影响
性研究术 ．
石振明①② 管圣功① 陈锡锋③
(① 同济大学地下建筑与工程系上海200092)
(② 同济大学岩土及地下工程教育部重点实验室上海200092)
(③杭州市公路管理局杭州310014)
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。
关键词振弦式应力计混凝土侧限条件应力
中图分类号：TV642 文献标识码：A ‘
STUDY oN CoNFINE CoNDITIoNS’ INFLUENCE oN VIBRATING
STRING STRESS M ETER M EASUR G CoNCRETE STRESS
SHI Zhenming~ GUAN Shenggong① CHEN Xifeng~
(①Department ofGeotechnical Engineering，Tongfi University，Shanghai 200092)
(~Key Laboratory ofGeotechnical and Underground Engineering ofMin~try ofEducation，Ton~i University，Shanghai 200092)
((~)Hangzhou Expressway Administration Bureau，Hangzhou 3 10014)
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 me—
ter 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 ac—
curately measure the stress of concrete，but the measured value is a little smaller than the real one；wrapped tll
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 corre—
spondingly smaller．
Key words Vibrating string stress meter，Concrete，Confine condition，Stress
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