在阐述振弦式压力盒组成结构和测试原理的基础上，结合江阴大桥(封面)南锚碇基底应力监测实践，分析了振弦式压力盒在刚性接触面应力监测中的可行性和存在的问题，推导出压力盒率定系数的表达式，提出基于有限元模拟分析的压力盒实测资料修正方法，建立了修正系数与被测介质刚度的关系式。研究成果表明，在刚性接触面应力监测中，振弦式压力盒的实测值普遍明显偏小，甚至仅为理论值的十几分之一，其原因是压力盒的实际受力条件与率定受力条件有明确而明显的不同，被测介质刚度对压力盒测值有重要影响。

In this paper, the structure and testing principle of vibrating wire pressure cell are presented firstly. Then, combined with the practice in the south anchorage of Jiangyin Yangtze Bridge, the feasibility and difficulty to monitor stress of rigid interface using vibrating wire pressure cell are analyzed. The expression of rating factor is deduced. And on the base of FEM, the method to modify observation data is introduced. Finally, the relationship between modification factor and medium rigidity is deduced. Study results indicate that, while monitoring the stress of rigid interface, the observed values are less than the actual stress values. Even, they are approximately one tenth of the theoretical value. The reason is that the real load condition of the pressure cell is obviously different from the rating load condition. The rigidity of medium affects observation results.