基于静力变形的大跨连续刚构桥钢束状态反演识别与评估  

Inverse Identification and Evaluation of the State of Prestress of Continuous Rigid Bridge with Long Spans based on Static Deformation

作　　者：沈建良 马文朔 严兵 朱尧于 贾勤龙 SHEN Jian-liang;MA Wen-shuo;YAN Bing;ZHU Yao-yu;JIA Qin-long(Jiangsu Sutong Bridge Co.Ltd.,Nantong 226001,China;CCCC Highway Bridges National Engineering Research Centre Co.Ltd.,Beijing 100088,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]江苏苏通大桥有限责任公司,南通市226001 [2]中交公路长大桥建设国家工程研究中心有限公司,北京市100088 [3]同济大学土木工程学院,上海市200092

出　　处：《公路》2024年第10期80-87,共8页Highway

基　　金：国家自然科学基金项目,项目编号51178335。

摘　　要：由于大跨连续刚构桥的开裂—下挠病害频发,因此针对其结构状态的识别与评估至关重要。与可靠度评估和人工智能评估相比,结构参数反演具有更为明确的因果关联与物理含义。提出一种基于静力变形的大跨连续刚构钢束状态反演识别与评估方法,该方法的优势在于保留了梁体内部钢束沿程空间应力的分布规律,并综合考虑了材料特性、刚度修正等因素的影响。研究以主跨268 m的苏通大桥辅航道桥为对象,结合该桥15年静力变形监测数据开展了针对结构钢束状态的反演识别,验证了该方法的有效性,并基于识别结果分析了结构下挠大幅小于设计预期的原因。本研究提出的方法可用于大跨连续刚构的结构状态识别与评估。In light of the frequent occurrence of crack-deflection defects,the identification and evaluation of the structural state of continuous rigid bridges with long spans are of paramount importance.Compared to reliability assessment and artificial intelligence evaluation,structural parameter inversion has clearer causality and physical significance.However,research in the field of bridge engineering is still limited till now.Therefore,in this paper a novel method for inverse identification and evaluation of the prestress state in continuous rigid bridges with long spans is proposed based on static deformation.The advantages of this method lie in preserving the distribution law of stress along the strand in the beam's internal space and considering the influences of material properties and stiffness corrections.Taking the auxiliary navigation bridge of the Sutong Bridge with a main span of 260 m as the object,the proposed method is validated through inverse identification of the structural state of the prestress using 15 years of static deformation monitoring data from the bridge.Furthermore,the reasons for the significantly lower deflection than the design expectation are analyzed based on the identification results.The proposed method holds promise for the identification and evaluation of the structural state of continuous rigid bridges with long spans.

关 键 词：桥梁工程 苏通大桥辅航道桥 大跨连续刚构桥 结构开裂刚度 静力变形 结构钢束状态反演识别 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]