FEM analysis on retrofitted continuous inverted arch structure of sluice floor
XU Huiliang1, SHAO Lin1, WANG Haijun2, ZHOU Yajun2
1.Jiangsu Water Conservancy Engineering Administration Division, Jiangdu, Jiangsu 225200, China; 2. Jiangsu Surveying and Design Institute of Water Resources Co. Ltd., Yangzhou, Jiangsu 225127, China
Abstract：Taking a retrofitting project of sluice floor as an example, the three-dimensional finite element 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, load shedding after the walls are simulated by using FEM software to realize the transformation between old and new structures. Based on analysis and comparison among four working 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 result, 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 can relive the stress in the floor, resulting in a 10% reduction in the maximum principal tensile stress. Unfortunately, the minimum principal compressive stress is increased a bit due to the extra-weight of the new structure.
[1]陈伟. 基于三维有限元法的太平闸反拱底板裂缝安全分析[J]. 水利技术与经济, 2010,16(7):755-756,759. CHEN Wei. Safety analysis of Taiping sluice′s anti-arched floor cracks based on 3D FEM [J]. Water conservancy science and technology and economy, 2010,16(7):755-756,759.(in Chinese)[2]周灿华,樊旭,蔡平. 大型水闸连续反拱底板加固技术研究[J].中国水利, 2012(12):18-20. ZHOU Canhua, FAN Xu, CAI Ping. Strengthening of continuous counter-arched base plate of large water gate[J]. China water resources, 2012(12):18-20.(in Chinese)[3]吴昊. 平板型钢围堰在反拱底板维修中的应用[J]. 江苏水利, 2012(5):33-34. WU Hao. Application of flat-plate steel cofferdam in anti-arched floor repair[J]. Jiangsu water resources, 2012(5):33-34.(in Chinese)[4]余解民,蔡洪卿. 黄沙港闸反拱底板水下修补加固技术[J].水利水电科技进展, 2002,22(3):41-43,58. YU Jieming, CAI Hongqing. Underwater mending and reinforcing techniques for inverted-arched bottom plate of Huangshagang sluice[J]. Advances in science and technology of water resources, 2002,22(3):41-43,58.(in Chinese)[5]吴发红. 挡潮闸水下反拱底板的加固技术研究[J]. 混凝土, 2007(9):88-90. WU Fahong. Reinforcement and repair investigation of reinforced concrete structures in a marine environment[J]. Concrete, 2007(9):88-90.(in Chinese)[6]江苏省水利勘测设计研究院有限公司. 宜陵北闸加固改造工程初步设计报告[R]. 江都: 江苏省江都水利工程管理处,2012.[7]罗人纲. 等效梁法解反拱底板问题[J]. 江苏水利, 1981(2): 18-34. LUO Rengang. The problem of solving inverted-arch floor by using the method of equivalent beam[J]. Jiangsu water resources, 1981(2): 18-34.(in Chinese)[8]管冰.弹性地基上反拱基础底板的计算[J]. 江苏水利, 1980(2): 88-102. GUAN Bing. Calculation of inverted-arch floor on elastic foundation[J]. Jiangsu water resources,1980(2): 88-102.(in Chinese)[9]葛孝椿.反拱底板内力分析[J]. 岩土工程学报, 1993,15(2):46-58. GE Xiaochun. Analysis of internal forces in inverted-arch floor[J]. Chinese journal of geotechnical engineering, 1993,15(2):46-58.(in Chinese)[10]孔庆阳,曹邱林. 基于有限元的反拱底板结构应力分析[J]. 水利与建筑工程学报, 2011,9(4):46-49. KONG Qingyang, CAO Qiulin. Analysis on stress of anti-arched floor structure by using FEM[J]. Journal of water resources and architectural engineering, 2011,9(4):46-49.(in Chinese)[11]苏超,戴丽媛. 三维有限元法在病险水闸整治工程中的应用研究[J]. 水力发电, 2015,41(3):41-44. SU Chao, DAI Liyuan. Application research of three dimensional finite element method on defective sluice engineering[J]. Water power, 2015,41(3):41-44.(in Chinese)
