波形钢腹板PC预制箱梁桥结构力学特性分析

Structural Mechanical Performance Analysis of PC Precast Box Girder Bridges with Corrugated Steel Webs

为研究波形钢腹板PC预制箱梁桥结构力学特性,以一座波形钢腹板预应力混凝土预制箱梁桥为例,借助大型专用有限元软件,建立了结构数字孪生模型,进行波形钢腹板验算分析,开展了静动载试验,对主梁挠度、应变和动力性能的实测值与理论值进行对比验证。结果表明,装配式预应力混凝土波形钢腹板先简支后连续箱梁具有优良的受力性能,桥梁结构在静力荷载作用下工作良好,实测的振动时域曲线与连续梁桥的振动规律一致,具有合理的振动时域、频域曲线、阻尼比及冲击系数,说明该桥的理论刚度小于整体刚度,满足设计要求。此研究有助于剖析波形钢腹板PC预制箱梁桥的实际受力性能并进行承载能力评价,对于波形钢腹板PC预制箱梁桥的建造与应用具有工程参考价值。

To study the mechanical characteristics of PC prefabricated box girder bridges with corrugated steel webs,the study takes a prestressed concrete precast box girder bridge with corrugated steel webs as an example,establishes a structural digital twin model with large-scale specialized finite element software,conducts verification analysis of corrugated steel webs,does static and dynamic load tests,and compares and verifies the measured values and theoretical values of the main beam deflection,strain,and dynamic performance.The results show that the prefabricated prestressed concrete corrugated steel web with simply supported.Continuous box girder has excellent mechanical performance.The bridge structure has a good working state under static load.The measured vibration time domain curve conforms to the vibration law of a continuous beam bridge.The vibration time domain,frequency domain curve,damping ratio,and impact coefficient are reasonable,which indicates that the overall stiffness of the bridge is greater than the theoretical stiffness.Therefore,the design requirements are fulfilled.The research helps to analyze the actual mechanical performance of PC prefabricated box girder bridges with corrugated steel webs and evaluate their bearing capacity.It has engineering reference value for the construction and application of PC prefabricated box girder bridges with corrugated steel webs.