混凝土振弦式应变计测试技术研究

Technique research of vibrational chord strain gauge to concrete

基于振弦式混凝土应变计的测试原理,在现场试验的基础上,对桥梁工程中应变测试的温度变化影响作了深入的探讨,分析了振弦式应变计的自由应变的温度影响以及约束温度应变的计算方法;提出了针对振弦式应变计的温度影响修正公式;同时对水化热影响的消除办法进行了分析探讨;提出了用测试应变反映混凝土应力的处理方法,并以荆州长江公路大桥为例介绍了这种消除办法和处理方法的应用效果。

Based on the principle of vibrational chord strain gauge to concrete, the temperature effect to concrete strain gauge is discussed in depth with the test on the building site. The free strain and restricted strain are analysed firstly. A method is developed to correct the temperature effect in the means of formula. The elimination measurement with regard to effect of concrete hydrate heat is also analyzed. The means which is to reveal the stress level according to strain value is presented. All those methods have been verified by the example of Jingzhou Yangtze River Bridge.