混合监测方法在桥梁静载试验中的应用

Application of hybrid monitoring method in bridge static load test

为了缓解桥梁健康监测系统成本与测点数量之间的矛盾,获得更加全面的监测信息,探索了一种将实测数据与数值模型相结合的混合监测方法。首先通过适当假设将经典的结构平衡方程进行简化,再从有限元模型中提取结构柔度矩阵,并由实测数据反算出等效荷载,最后将其带回原方程计算所需的结构响应。研究结果表明:该方法实现了从部分响应数据到全局响应数据的扩展,且计算效率较高,可避免反复的有限元分析。混合监测技术对结构响应的计算有较高的精度,计算得到的响应与实际响应误差均在10%以内。

In order to alleviate the contradiction between the cost of bridge monitoring systems and the number of measurement points,and obtain more comprehensive monitoring information,a hybrid monitoring method combining measured data and numerical models was explored.Firstly,the classical structural equilibrium equation was simplified through appropriate assumptions,then the structural flexibility matrix was extracted from the finite element model,and the equivalent load was calculated from the measured data.Finally,it was brought back to the original equation to calculate the required structural response.The research results show that this method realizes the expansion from partial response data to global response data,and has high computational efficiency,which can avoid repeated finite element analysis.the hybrid monitoring technology has a high accuracy in calculating the structural response,and the error between the calculated response and the actual response is within 10%.