基于有限元模型修正的悬臂梁桥长期挠度研究分析

RESEARCH AND ANALYSIS OF LONG-TERM DEFLECTION OF CANTILEVER BEAM BRIDGE BASED ON FINITE ELEMENT MODEL MODIFICATION

采用悬臂法施工的现浇节段桥的长期挠度通常大于设计的预期挠度。因此对此类桥梁进行详细的结构分析和健康监测具有重要意义。本研究对大跨度预应力混凝土桥梁挠度超出预期的常见现象进行了综合分析。为了揭示和量化桥梁产生过度挠度的原因,进行了详细的有限元分析。研究结果与自施工初期就定期进行的现场测量结果进行了比较。将挠度增量、预应力增量和混凝土应变增量的理论值与实测数据进行了比较。

The long-term deflection of cast-in-place segmental bridge constructed by cantilever method is often greater than the expected deflection.Therefore,the detailed structural analysis and health monitoring of this kind of bridge is of great significance.This paper makes a comprehensive analysis of the common phenomenon that the deflection of long-span prestressed concrete bridge exceeds the expectation.In order to reveal and quantify the causes of excessive deflection,a detailed finite element analysis is carried out.The research results are compared with the field measurement results which have been carried out regularly since the initial stage of construction.The theoretical values of deflection increment,prestress increment and concrete strain increment are compared with the measured data.