新型悬挂式钢板活动防洪堤技术研究

发布时间：2018-09-01 12:45

【摘要】：水是人类发展和生存的必需条件,我国城市建设沿江河湖海岸边布置较多。城市地理位置的特殊性,使得城市面临着洪水的威胁,因此在城市安全防护中,城市防洪显得非常重要。近年来热岛效应越来越明显,导致城市降雨量显著增加,而城市下垫面的改变,加快了雨水汇流,导致洪峰流量增大,同时,气候条件的逐年恶化,极端气候条件频繁出现,城市防洪问题更加严峻。而随着经济发展和社会的不断进步,人们的防洪理念逐渐从传统水利向现代水利过渡,城市防洪逐步向与生态环境相结合,与城市建设规划相配套的多功能方向转变。文章针对城市防洪和城市滨水区景观相矛盾的问题,设计开发了新型悬挂式钢板活动防洪堤,在国内外均为首创,其能够在保证防洪安全的条件下,满足城市景观的要求。同时本文依据安全性原则、景观性原则、实用性原则详细介绍了新型悬挂式钢板活动防洪堤结构单元方案,以及运行管理方案。利用三维有限元软件,结合有限元强度折减理论,模拟分析了新型悬挂式钢板活动防洪堤与基础间的变形协调。同时仿真模拟了悬挂式钢板活动防洪堤在校核洪水位工况、设计洪水位工况、常水位工况、完建工况下的工作性能,对其应力及位移结果进行了总结分析,为悬挂式钢板活动防洪堤能够运用于实际工程中提供了理论依据。利用三维有限元软件模态分析功能对悬挂式钢板活动防洪堤进行模态分析,同时考虑到附连水质量的影响,对其进行了干、湿模态分析,求解出结构干、湿模态下的固有频率及其振型,说明其自振频率范围;利用三维有限元软件瞬态动力分析的功能,结合Airy波波浪理论,模拟了悬挂式钢板活动防洪堤在校核洪水位及设计洪水位工况波浪荷载作用下的结构动力响应,总结分析了结构的位移和应力响应过程线。综上分析,本文提出了一种新型悬挂式钢板活动防洪堤,不仅能够满足防洪的要求,同时能够兼顾城市景观,并利用数值分析的方法模拟了该结构的工作性能,说明了其理论合理性,对实际工程有较大的指导意义。
[Abstract]:Water is a necessary condition for human development and survival. Because of the particularity of the city location, the city is facing the threat of flood, so the city flood control is very important in the city safety protection. In recent years, the heat island effect has become more and more obvious, leading to a marked increase in urban rainfall, while the change of the urban underlying surface has accelerated Rain Water's confluence, resulting in an increase in traffic volume of Hong Feng. At the same time, the climatic conditions have deteriorated year by year, and extreme climatic conditions have frequently appeared. The problem of urban flood control is even more serious. With the development of economy and society, the concept of flood control is gradually changing from traditional water conservancy to modern water conservancy. Aiming at the contradiction between urban flood control and urban waterfront landscape, this paper designs and develops a new type of suspended steel plate active flood prevention embankment, which is the first at home and abroad, which can meet the requirements of urban landscape under the condition of ensuring flood control safety. At the same time, according to safety principle, landscape principle and practicability principle, this paper introduces the structure unit scheme of new type suspended steel plate movable flood prevention embankment in detail, as well as the operation management scheme. By using 3D finite element software and finite element strength reduction theory, the deformation coordination between the new suspended steel plate movable flood prevention embankment and foundation is simulated and analyzed. At the same time, the working performance of suspended steel plate active flood prevention embankment under the conditions of nuclear flood level at school, design flood water level, constant water level and finished construction is simulated, and the results of stress and displacement are summarized and analyzed. It provides a theoretical basis for the application of suspended steel plate movable flood prevention embankment in practical engineering. Using the modal analysis function of 3D finite element software, the modal analysis of suspended steel plate movable flood prevention embankment is carried out, and considering the influence of attached water quality, the dry and wet modal analysis is carried out, and the structure dry is solved. The natural frequencies and their modes in the wet mode show the range of their natural frequencies, using the function of transient dynamic analysis of 3D finite element software, combined with the theory of Airy wave, The dynamic response of the structure under wave load under the condition of the suspended steel plate active flood prevention embankment is simulated, and the displacement and stress response process of the structure is summarized and analyzed. Based on the above analysis, a new type of suspended steel plate active flood prevention embankment is proposed, which can not only meet the requirements of flood control, but also take into account the urban landscape. The working performance of the structure is simulated by numerical analysis. The rationality of the theory is explained, which is of great guiding significance to the practical engineering.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV871

【参考文献】