Assessing Dynamic Load Allowance of the Negative Bending Moment in Continuous Girder Bridges by Weighted Average Method
Assessing Dynamic Load Allowance of the Negative Bending Moment in Continuous Girder Bridges by Weighted Average Method
复制标题
DOI：
10.3390/coatings12091233
复制
发表时间：
2022-08
期刊：
影响因子：
3.4
通讯作者：
Yelu Wang;Jun Tian;Yongjun Zhou;Yu Zhao;W. Feng;Keqiang Mao
中科院分区：
文献类型：
--
作者：
Yelu Wang;Jun Tian;Yongjun Zhou;Yu Zhao;W. Feng;Keqiang Mao
基于实测数据准确获取桥梁动载裕度是桥梁安全评估的基础。当不能实现静态负载测试并且滤波失败时，由于选择左频带或右频带，来自实验方法的估计的DLA变化很大。本文提出的加权平均法（WAM）是用来解决上述问题的可能性在连续梁桥。首次以两跨和三跨预制混凝土箱梁桥为例，采用统计学中的标准差和变异系数法对预制混凝土箱梁的截取段进行优化。最后，以负弯矩的DLA测量为例，验证了WAM的有效性。结果表明，10 L/16 ~ L的截取段偏距较小，变异系数稳定，适合于WAM计算负弯矩的DLA。WAM对“坏数据”中的异常值过滤具有较强的抗干扰能力，与实验方法有显著差异。在场桥的三次测量中，由WAM获得的DLA比实验和低通滤波方法具有更小的色散。
Accurate acquisition of dynamic load allowance (DLA) based on measurement data is essential to the safety assessment of a bridge. When static load tests cannot be achieved, and filtering fails, the estimated DLAs from the experimental method vary widely due to the choice of a left or right band. In this paper, the proposed weighted average method (WAM) is used to possibly solve the above problem in continuous gird bridges. Two-span and three-span precast concrete box-gird bridges were selected to optimize intercepted segments of WAM for the first time with the assistance of standard deviation and coefficient of variation in statistics. Then, a DLA measurement case of the negative bending moment was utilized to verify the validity of the WAM. The results show that the intercepted segments of 10L/16 to L were suitable for the WAM to calculate the DLA of the negative bending moment due to small offset moments and stable variation coefficients. The WAM had a strong anti-interference ability of outliers filtering in “bad data,” which differed significantly from the experimental method. In three measurements of a field bridge, DLAs obtained by the WAM had less dispersion than the experimental and low-pass filtering methods.