基于监测数据桥梁结构状态评估实用方法研究

监测系统测得的信号经处理后,以各指标的变化量为基准,提出一种围绕指标变化量这一新型评判参数的状态评估理论。从各指标变化量的近似统计分布规律着手,依据置信度和置信区间的概念,提出一种新的状态等级划分方法。由于监测数据与状态等级划分的标准均为区间数,采用区间可拓评价理论建立桥梁结构状态评估模型。引入集值统计和重心决策理论将权重分为主观权重和客观权重来分别计算。最后,以菜园坝长江大桥主桥作为工程实例,利用理论及相应监测数据进行评估分析,结果表明菜园坝大桥整体运营状态良好,评定结果与实际情况吻合较好,故可认为此种评定理论较为合理,具有较好的工程实用性。

RESEARCH ON PRACTICAL METHOD OF BRIDGE STRUCTURE CONDITION EVALUATION BASED ON MONITORING DATA

After processed the signals obtained from monitoring system,one theory of condition evaluation was proposed on the basis of a new evaluation parameter—index variation. One new condition grade division method was proposed from approximate statistic distribution of index variation,and as per the concept of confidence degree and confidence interval. Because the monitoring data and the standard of condition grade division were all interval numbers,interval extension evaluation theory was adopted to establish the model of condition evaluation. Set-valued statistics and gravity center based decision theory were introduced to divide weight into subjective weight and objective weight to make calculation. Finally,the main bridge of Caiyuanba Yangtze River Bridge was taken for example to do evaluation and analysis by the monitoring data and the theory,and the result showed that the operation condition of main bridge of Caiyuanba Yangtze River Bridge was good,and the result agreed well with the bridge's actual condition,so this evaluation method was found to be reasonable and had good project practicability.