基于裂缝统计量的桥梁性能评估方法(英文)

Crack Statistic-Based Method for Bridge Performance Assessment

通过统计结构表面的裂缝总量,来推断结构的承载能力现状或者剩余承载力,从而提出了一种混凝土桥梁性能评估的新方法.该方法使用有限元数值分析程序来模拟混凝土的开裂过程,采用正交试验来研究性能与裂缝之间的多元关系.试验包括两部分:(1)筛选试验,该试验确定对性能与裂缝关系影响较大的因素集;(2)回归试验,该试验建立包含这些因素的性能-裂缝多元关系.试验结果表明,利用仅包含少数主要影响因素的回归模型,可以得到对性能的较为准确的推断.因此,这种方法是可行的,并且由于其经济性和便利性,可以作为桥梁管理系统中定期评估的有效手段.

This paper proposes a new method for the performance assessment of concrete bridge, in which the capacity or the residual capasity of a bridge is estimated according to the statistic quantities of all the cracks on the bridge surfaces. The finite element numerical analysis instead of ＂real experiments＂ is performed to simulate the concrete cracking process, and the simulated experiments are designed to be orthogonal to reveal the multivariate relationships between the bridge performance and the cracks. In these experiments, the importance of different factors affecting the multiple relationship is determined through a screening analysis, and the relationship between the performance and the cracks is illustrated by setting up a regression model. Experimental results show that the regression model with fewer factors can yield accurate and reliable assesment results. Thus, the proposed method can be used as an effective means for the periodic assessments in bridge management system due to its feasibility, convinience and low cost.