摘要
应用ANSYS有限元软件对1座钢筋混凝土5跨拱桥的拱肋拆除施工过程进行了分析。以龙门吊索力和千斤顶的预撑力作为设计变量,以拱肋截面应力、墩顶水平推力为控制变量,以拱肋切割截面的混凝土最小应力作为目标函数,应用ANSYS的优化分析方法确定拆除施工过程中的技术参数;同时对拆除过程中的冲击影响和环境因素进行了分析。结果表明:通过龙门吊索和拱下千斤顶的共同作用,在拱肋拆除过程中结构的应力、挠度变化量和墩顶水平推力都比较小,结构的拆除施工安全可靠;在拱肋拆除过程中,环境温度变化对拱肋及拱下支撑的受力有明显影响,应制定相应的技术措施以减少温度对结构的不利影响。
The rib disassembly of a RC multiple arch bridge with five spans was simulated using ANSYS finite element software. Defining the cable forces of gantry crane and support forces of jacks as design variables, adopting the rib stress on cross-section and horizontal thrusts at piers＂ top as control variables, and taking the minimum stress of rib on cross-section as objective function, the technical parameters needed in disassembly construction control were determined by using optimization analysis methods in ANSYS. The impact and environmental factors in disassembly were taken into account as well. The results show that through combining action of gantry crane and jacks, the rib＇s stress, deflection deformation and the horizontal thrusts at piers＇ top were quite small, which testified the structure was safe during the rib disassembly. The stress of rib and the support forces of jacks are obviously influenced by environmental temperature, and the effective technical measures should be taken to decrease the negative impact of temperature on structure.
出处
《建筑科学与工程学报》
CAS
2009年第4期114-119,共6页
Journal of Architecture and Civil Engineering
关键词
多跨钢筋混凝土拱桥
拱肋
拆除
仿真分析
环境因素
冲击影响
RC multi-span arch bridge
rib
disassembly
simulation analysis
environmental factor
impact influence
