摘要
以某立体通行环境下大跨混合梁桥为工程背景,为保证桥梁浮托顶推施工安全,运用有限元分析软件对钢箱梁线形、结构应力进行数值分析,以确保桥梁受力及变形在设计要求范围之内,满足设计要求;同时,对落梁阶段导梁整体受力进行分析验算,保证落梁时钢箱梁的安全稳定,并对顶推过程中箱梁横向偏移产生的影响进行分析。结果表明:顶推过程中钢箱梁在最不利荷载状态下应力为248 MPa,最大变形为19.73 mm,满足设计要求;施工过程箱梁发生横向偏移会对局部构件受力产生明显影响,建议横向位移偏差控制在15 mm以内。
This paper takes a long-span steel-concrete mixed continuous beam bridge in a three-dimensional traffic environment as the engineering background,in order to ensure the safety of bridge float tow and pushing construction,finite element analysis software is used to perform numerical analysis on the linear shape and structural stress of the steel box girder to ensure that the stress and deformation of the bridge are within the design requirements and meet the design requirements.At the same time,the overall force of the guide beam during the beam dropping stage is analyzed and checked to ensure the safety and stability of the steel box girder when the beam is dropped.The influence of lateral displacement in pushing process is analyzed.The results show that the stress of the steel box girder under the most unfavorable load state during pushing process is 248 MPa,and the maximum deformation is 19.73 mm,which meets the design requirements.The lateral displacement deviation of the box girder during the construction process has a significant impact on the stress of local components.It is recommended to control the lateral displacement deviation within 15 mm.
作者
汤兴
TANG Xing(China Railway 24th Bureau Group Road&Bridge Co.Ltd.,Shanghai 200072,China)
出处
《铁道建筑技术》
2024年第10期142-146,共5页
Railway Construction Technology
基金
中铁二十四局集团有限公司科技研发项目(2020-10)。
关键词
钢箱梁
浮托顶推
横向偏移
施工控制
数值分析
steel box girder
float tow and pushing
lateral displacement deviation
construction control
numerical analysis
