内河架空直立式码头水上施工平台的有限元受力分析及监控预警研究

发布时间：2018-06-24 03:24

本文选题：钢管桩 + 施工平台　；参考：《重庆交通大学》2014年硕士论文

【摘要】：伴随着长江水运行业的发展，内河架空直立式框架码头得到广泛应用。作为施工码头基础桩基的作业平台，水上施工平台由于其平台稳固安全，使用方便等优点得到充分的发展和应用。由于施工平台为施工临时结构，它区别于永久性的构筑物，施工平台在施工期和营运期还受到荷载众多，因此保障施工平台安全的运营，对后期码头施工极其重要。本文重庆果园港码头二期项目为依托，对水上施工平台展开受力分析，并研究其失稳破坏形式和营运期的监控方案，这对水上施工平台的科学设计以及保证建成后的营运安全非常重要。本文主要研究内容和结论如下：（1）阐述了重庆果园港码头二期施工平台的施工方法和技术要点；在此基础上通过运用MIDAS/Civil有限元软件建立合理简化的施工平台三维有限元模型。并对施工平台的荷载进行了详细的说明，介绍其加载方式。（2）分别分析了施工平台在竖向荷载和水平荷载下的受力和变形规律，结果表明：在竖向荷载下，钢管桩承担了施工平台的主要荷载和变形，竖向荷载短暂状况下作用效应组合值不满足钢管桩压杆稳定性要求的临界值；在水平荷载下，施工平台整体产生侧移、扭转变形，钢管桩桩底产生最大弯矩、剪力、扭矩、应力，，以及随着水流力的增大，弯矩、剪力、扭矩、应力呈现线性增长到快速增长的趋势。对钢管桩截面特性对施工平台的受力影响进行了计算分析，结果表明弯曲截面系数是影响平台最大应力的关键参数，断面惯性矩是影响平台最大水平位移的关键参数。（3）研究施工平台的稳定性问题，分析了施工平台的4种主要破坏模式，并探讨其破坏机理。针对施工平台的破坏模式，提出了4种在洪水期或极限荷载下施工平台的安全保障措施，这对实际工程有极大的帮助作用。（4）制定施工平台的监控方案，介绍了监控内容、监控方法、监控仪器和监控频率等，并分析了监控的误差和影响因素。对施工平台的监控提出了预警系统，确定其预警值，编制施工平台的应急响应预案。
[Abstract]:With the development of the Yangtze River water transportation industry, the inland river vertical frame wharf is widely used. As the working platform of the foundation pile foundation of the construction wharf, the water construction platform has been fully developed and applied because of its advantages of stable, safe and easy to use. Because the construction platform is a temporary construction structure, it is different from the permanent structure, the construction platform is also subjected to many loads during the construction period and the operation period, so it is very important to ensure the safe operation of the construction platform, which is very important for the later construction of the wharf. Based on the second phase project of Chongqing Orchard Port, this paper analyzes the stress on the water construction platform, and studies its failure form and monitoring scheme in operation period. This is very important for the scientific design of the platform and the safety of operation after completion. The main contents and conclusions of this paper are as follows: (1) the construction method and technical essentials of the second stage construction platform of Chongqing Orchard Port are expounded; On this basis, a reasonable and simplified 3D finite element model of construction platform is established by using Midas / Civil finite element software. The load of construction platform is explained in detail, and its loading mode is introduced. (2) the law of stress and deformation of construction platform under vertical load and horizontal load are analyzed respectively. The results show that: under vertical load, The steel pipe pile bears the main load and deformation of the construction platform, the combined value of the action effect under the temporary vertical load does not meet the critical value of the stability requirement of the steel pipe pile, and under the horizontal load, the whole construction platform produces lateral displacement and torsional deformation. The maximum bending moment, shear force, torque, stress, and with the increase of flow force, bending moment, shear force, torque and stress increase linearly. The influence of the cross-section characteristics of steel pipe pile on the stress of the construction platform is calculated and analyzed. The results show that the bending section coefficient is the key parameter affecting the maximum stress of the platform. The moment of inertia of the section is the key parameter affecting the maximum horizontal displacement of the platform. (3) the stability of the construction platform is studied and the four main failure modes of the platform are analyzed and the failure mechanism is discussed. In view of the failure mode of the construction platform, four kinds of safety and security measures for the construction platform under flood period or ultimate load are put forward, which are of great help to the actual engineering. (4) the monitoring scheme of the construction platform is formulated. The contents, methods, instruments and frequency of monitoring are introduced, and the error and influencing factors are analyzed. An early warning system is put forward to monitor and control the construction platform, and its early warning value is determined, and the emergency response plan of the construction platform is worked out.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U656.1

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