摘要
为研究桥面板施工方案对无砟轨道钢桁结合梁斜拉桥结构受力性能的影响,以某在建主跨400 m的无砟轨道钢桁结合梁斜拉桥为背景,结合施工条件,提出桥面板与钢梁同步施工、滞后二节间施工以及滞后三节间施工3种典型的桥面板施工方案,采用MIDAS Civil软件建立全桥施工全过程有限元模型,采用一种新的桥面板架设与浇筑的模拟方法(虚拟桥面板法),分析不同桥面板施工方案对成桥合龙线形、桥面板应力分布及钢梁应力的影响。结果表明:相较于传统梁单元荷载法,虚拟桥面板法不仅能精准地模拟桥面板架设与浇筑过程,且显著提高了施工模拟效率;不同桥面板施工方案对成桥合龙线形和桥面板应力分布具有重要影响,滞后三节间施工方案在优化成桥合龙线形、降低桥面板拉应力以及改善钢梁受力分布方面综合表现最佳,且施工可行性与组织优势明显,可为该类桥梁设计与施工提供参考。
This study investigates the effects of upper deck panel construction schemes on the load bearing behavior of the cable-stayed bridge with superstructure featuring steel trusses and orthotropic deck plates,and accommodating ballastless tracks.An under-construction cable-stayed bridge with a main span of 400 m is used as a case.Given the construction conditions at the bridge site,three deck panel construction schemes were considered,including constructing the deck panels and the steel trusses simultaneously(SchemeⅠ),installing the deck panels two segments behind the steel trusses(SchemeⅡ),and installing the deck panels three segments behind the steel trusses(SchemeⅢ).The full construction process was numerically simulated in MIDAS Civil,to analyze the effects of different deck panel construction schemes on the as-built geometry of the bridge,stress distribution in the deck panels as well as stresses in the steel trusses(virtual deck panel method).It is demonstrated that compared with the conventional beam-element method,the virtual deck panel method can not only simulate the erection and casting process,but also lead to improved construction simulation efficiency.Different deck panel construction schemes exert different influence on the geometry of the as-built bridge as well as the stress distribution in the deck panels.When the deck panels were installed three segments behind the steel trusses,the geometry of the as-built bridge,tensile stress in the deck panels and the load-bearing performance of the superstructure are the best,at the same time,easier to be implemented and organized.This study provides further insight into the design and construction of the cable-stayed bridge accommodating ballastless tracks and featuring the superstructure of combined orthotropic deck plates and steel trusses.
作者
李潜
毛明伟
贺志启
LI Qian;MAO Mingwei;HE Zhiqi(China Railway Wuhan Bridge Engineering Consulting and Supervision Co.,Ltd.,Wuhan 430056,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)
出处
《世界桥梁》
北大核心
2025年第4期103-109,共7页
World Bridges
基金
国家自然科学基金项目(52178116)
江苏省自然科学基金项目(BK20220072)。
关键词
斜拉桥
钢桁结合梁
桥面板
施工方案
受力性能
成桥线形
有限元法
cable-stayed bridge
composite steel truss
deck panel
construction scheme
load-bearing performance
as-built bridge geometry
finite element method
