现役桥梁承载能力的灰靶理论评价

Grey target theory evaluation of bearing capacity for bridges in use

为能形象直观反应桥梁的承载能力状况,保证公路桥梁运行安全,并更加科学地对桥梁进行养护管理,提出了现役桥梁承载能力的灰靶理论分级评价方法.通过实际采集沈阳市(铁西区横跨卫公明渠的)8座旧桥的荷载试验数据,合理选取挠度比、应变比、相对残余挠度、相对残余应变、振动频率比和阻尼比这6个状态指标建立灰靶,选取标准模式作为靶心,利用灰靶理论计算各桥梁的靶心度进行分级评价,结果显示八座桥梁分为3个等级,与现行的公路桥涵技术评定等级相吻合,证明了桥梁承载能力的灰靶理论评价方法的可行性和有效性.

In order to vividly represent the carrying capacity of bridge, ensure the safety of the highway bridges, and have a more scientific and reasonable maintenance management for bridges, this paper put forward an evaluation method of grey target theory to classify the carrying capacity of bridges. By collecting the actual load tentative data from eight old bridges in of Shenyang（Tiexi District stretches across Wei open canal）, and selecting the six status indicators（deflection ratio, strain ratio, relative residual deflection ratio, the relative residual strain ratio and vibrational frequency）, this study established the grey target, selected the standard mode as the bull＇s eye, and calculated the bull＇s eyes of various bridges using the grey target theory to carry on the graduation appraisal. The results show that eight bridges are divided into three ranks, which matches with the present road arch of bridge technology evaluation rank. The grey target theory assessment method for evaluation the bridge bearing capacity is proven to be valid and feasible, which provides reference for the carrying capacity appraisal for other engineering project.