邻近铁路钢-混混合梁转体施工监控及受力性能分析  

Construction Monitoring and Mechanical Performance Analysis of Adjacent Railway Steel-Concrete Hybrid Beam Rotation

作　　者：罗利[1] LUO Li(China Railway 18th Bureau Group No.2 Engineering Co.,Ltd.,Tangshan 064000,China)

机构地区：[1]中铁十八局集团第二工程有限公司,河北唐山064000

出　　处：《国防交通工程与技术》2023年第4期52-56,共5页Traffic Engineering and Technology for National Defence

摘　　要：为保证钢-混混合梁转体施工过程中桥梁结构的安全与稳定性,以邢台市龙泉大街邻近铁路钢-混混合梁转体桥梁为背景,采用数值模拟计算与实桥现场测试相结合的方法,开展对邻近铁路钢-混混合梁转体施工监控。研究结果表明:在转体施工全过程中主梁整体受力性能良好,但在拆架后转体施工阶段混凝土顶板出现了0.88 MPa的拉应力,表明拆架后转体施工阶段是施工全过程中最不利的施工阶段;该桥在施工过程中结构关键部位应力、线形的实测数据与数值模拟计算数据基本一致,且实测梁端横、竖向振幅与加速度分别未超过1 mm、0.15 m·s^(-2),梁端振动响应在可控范围内,充分说明了该施工方案的适用性与合理性。In order to ensure the safety and stability of the bridge structure during the swivel construction of the steel-concrete hybrid beam,taking the steel-concrete hybrid beam swivel bridge near Longquan Street in Xingtai City as the background,the numerical simulation calculation and the actual bridge field test are combined to carry out the research on the monitoring technology and mechanical performance of the swivel construction of the steel-concrete hybrid beam of the adjacent railway.The results show that the overall mechanical performance of the main girder is good in the whole process of swivel construction.However,the tensile stress of 0.88 MPa appears in the concrete roof during the stage of swivel construction after removing the frame,indicating that the swivel construction stage after removing the frame is the most unfavorable construction stage in the whole process of construction.The measured data of the stress and alignment of the key parts of the bridge during the construction process are basically consistent with the numerical simulation data,and the measured transverse vertical amplitude and acceleration of the beam end are less than 1 mm and 0.15 m·s~(-2),respectively.The vibration response of the beam end is within the controllable range,which fully demonstrates the applicability and rationality of the construction scheme.

关 键 词：钢-混混合梁 水平转体 施工监控 受力分析 

分 类 号：U445.465[建筑科学—桥梁与隧道工程] U446.2[交通运输工程—道路与铁道工程]