新型垂直升降式防洪（潮）堤技术研究

发布时间：2018-05-18 16:04

本文选题：城市防洪 + 垂直升降式　；参考：《天津大学》2014年硕士论文

【摘要】：随着城市发展进程的加快,沿海及滨河城市对于城市防洪安全的标准也将逐步提高,然而由于城市土地资源及城市景观建设的限制,传统城市防洪工程已经不能满足相应的使用要求。为此,本文提出新型垂直升降式防洪(潮)工程结构方案,既避免了对城市宝贵土地资源的占用,同时为城市景观建设提供宽阔的视野。该方案结构形式新颖,国内外没有工程应用先例,为确保该方案结构的可建设实施性,本文通过建立数值模型,借助大型有限元计算软件Ansys,对该结构的静力及动力响应进行数值模拟分析。具体包括以下内容:首先,系统地总结国内外城市防洪工程建设的现状,对目前区别于传统形式的城市防洪结构形式的优缺点进行对比分析,在此基础上提出新型垂直升降式防洪(潮)堤技术方案,并对该方案进行系统的介绍。其次,通过静力分析,对该方案所提出的结构在静力作用下的应力及变形挠度进行统计,数值模拟结果表明:在静力作用下结构的刚度及应力均满足规范设计要求,并且具有较高的安全储备系数,其相对挠度最大值为1/1630,小于规范允许值1/600。地基沉降微弱,结构沉降量在允许的范围之内,相邻结构之间可协调运行。再次,通过动力分析中的模态分析,对整体结构的固有频率进行探索。考虑到钢闸板前的水位是变化的,模态分析过程中分别计算结构的干、湿两种模态。计算结果表明,附加水质量对结构的固有频率影响很大,一阶固有频率的变化区间为12.72~18.91Hz,各阶频率最大降幅为37.5%,尽管如此,该结构的整体固有频率仍远高于外界激励荷载的频率,因此结构具有较高的抗共振破坏风险的能力。最后,根据该区域特征选取该区域波浪荷载的计算方式,并通过施加波浪荷载对结构进行动态响应分析。设计工况与校核工况下不同波浪荷载作用下,对钢闸板的应力及位移变化最大值进行统计对比分析。结果表明:在两种工况下结构振动微弱,并且强度足够。
[Abstract]:With the acceleration of urban development, coastal and riverside cities will gradually improve the safety of urban flood control standards, but due to urban land resources and urban landscape construction constraints, Traditional urban flood control projects can not meet the corresponding requirements. Therefore, this paper puts forward a new vertical lifting flood control (tide) engineering structure scheme, which can avoid the occupation of the precious land resources of the city and provide a broad view for the urban landscape construction at the same time. The structure of the scheme is novel and there is no engineering application precedent at home and abroad. In order to ensure the constructability of the scheme structure, a numerical model is established in this paper. The static and dynamic responses of the structure are simulated and analyzed by means of finite element software Ansys. The specific contents are as follows: first, systematically summarize the current situation of urban flood control engineering construction at home and abroad, and compare and analyze the advantages and disadvantages of the current form of urban flood control structure, which is different from the traditional form of urban flood control structure. On this basis, a new vertical lifting flood control (tide) embankment technical scheme is put forward, and the scheme is introduced systematically. Secondly, through static analysis, the stress and deformation deflection of the structure under static force are analyzed. The numerical simulation results show that the stiffness and stress of the structure under static force can meet the design requirements of the code. The maximum relative deflection is 1 / 1630, which is less than the allowable value of 1 / 600. The settlement of the foundation is weak, the settlement of the structure is within the allowable range, and the adjacent structures can operate harmoniously. Thirdly, the natural frequency of the whole structure is explored by modal analysis in dynamic analysis. Considering the variation of the water level in front of the steel gate, the dry and wet modes of the structure are calculated in the process of modal analysis. The calculation results show that the mass of additional water has a great influence on the natural frequency of the structure. The variation range of the first order natural frequency is 12.72 脳 18.91Hz. the maximum decrease of each order frequency is 37.5hz. however, the overall natural frequency of the structure is still much higher than the frequency of the external excitation load. Therefore, the structure has a higher ability to resist the risk of resonance damage. Finally, according to the characteristics of the region, the calculation method of the wave load in the region is selected, and the dynamic response of the structure is analyzed by applying the wave load. Under different wave loads under design and check conditions, the maximum stress and displacement variation of steel sluice plate are analyzed statistically and contrastively. The results show that the vibration of the structure is weak and the strength is enough under two conditions.
【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】：TU998.4;TV871

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