连续反拱底板结构水闸加固改造的有限元分析  

FEM analysis on retrofitted continuous inverted arch structure of sluice floor

作　　者：徐惠亮[1] 邵林[1] 王海俊[2] 周亚军[2] 

机构地区：[1]江苏省江都水利工程管理处,江苏江都225200 [2]江苏省水利勘测设计研究院有限公司,江苏扬州225127

出　　处：《排灌机械工程学报》2016年第7期615-619,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：江苏省水利科技项目(2015090)

摘　　要：以某连续反拱底板水闸加固改造工程为例,建立反拱底板水闸改造前后三维有限元仿真数值计算模型,利用有限元计算软件模拟公路桥拱圈、工作桥的拆建,底板填平,新建支撑结构以及墙后减载等施工过程,实现拆除部分与新建部分的替换.通过改造前、结构拆除、减载、改造后4种工况的分析对比,研究了拆除、减载、新建过程对闸室底板应力状态的影响.研究结果表明:采用有限元计算可直观、准确地反应施工过程中底板应力变化趋势,主拉应力极值主要位于边孔部位;施工过程中,采取减载措施有效减小了底板受力,与未减载工况相比,底板主拉、主压应力极值分别减小了40%和55%,避免了施工期应力突变;反拱底板填平能够改善底板受力状况,改造后底板主拉应力减小了10%左右,主压应力由于受新建结构加重的影响有所增大.Taking a retrofitting project of sluice floor as an example, the three-dimensional finite ele- ment model of the continuous inverted arch structure of a sluice floor is generated. Several construction processes, such as demolition and reconstruction of traffic and operating bridges, floor slab filling, new support structure, and load shedding after the walls are simulated by using FEM software to realize the transformation between old and new structures. Based on the analysis and comparison among four wor- king conditions, namely old structure, structure demolition, load shedding and structure reconstruction, the effects of working condition on the stress state in the floor are investigated. It is shown that FEM analysis can reflect the variation tendency of stress in the floor in a construction process intuitively and accurately, suggesting the maximum principal tensile stress is mainly located at the edges of holes. The load shedding means can reduce the stress level in the floor occurred in a construction process, as a re-suh, the maximum principal tensile and minimum compressive stresses are lowed by 40% and 55% , respectively, compared with the operating condition without load shedding; thus an abrupt change in the stress will be avoided during construction processes. The inverted arch floor slab filling relive the stress in the floor, resulting in a 10% reduction in the maximum principal tensile stress. Unfortunate- ly, the minimum principal compressive stress is increased due to the extra-weight of the new structure.

关 键 词：水闸 反拱底板 加固改造 应力分析 有限元法 减载 

分 类 号：TN914.3[电子电信—通信与信息系统]