基于钢护筒的钢筋混凝土桩大水位差码头横向排架可靠度分析

发布时间：2018-03-31 09:01

本文选题：三峡库区　切入点：大水位差码头　出处：《重庆交通大学》2014年硕士论文

【摘要】：三峡成库蓄水后，库区的水文条件发生了很大变化以及库区独特的地质情况，内河大水位差架空直立框架码头建设时可考虑利用桩基钢护筒来实现施工水位下的联系构件的高效、快速焊接。针对重庆果园码头二期工程钢护筒与钢筋混凝土联合受力结构水工码头结构，建立考虑钢护筒和钢筋混凝土联合受力的数值模型进行力学性能分析，然后探讨基于钢护筒的钢筋混凝土桩大水位差码头横向排架可靠度。研究成果对三峡库区的码头设计建设具有一定的参考价值。本文主要完成了以下研究工作：首先，利用ANSYS对内河大水位差架空直立框架码头进行静力分析，探讨了码头横向排架码头的力学传递特性以及码头的薄弱环节。为下面进行可靠度的分析奠定了基础。然后，，结合Monte Carlo法与ANSYS中的概率计算模块PDS，对内河大水位差架空直立框架码头的横向排架各个构件进行可靠度分析、灵敏度分析、散点图分析。分析了横向排架的各构件在不同工况组合作用下的可靠指标。同时通过灵敏度分析探讨各个随机输入变量对构件可靠指标的影响程度。鉴于可靠度分析得到的结论，码头横向排架的各构件的可靠指标均大于规范要求的3.5且部分构件远远大于规范要求的3.5。从而有必要对码头结构进行优化设计以达到减少经济投资与资源浪费的目的。最后，利用ANSYS中的优化设计模块Opt对码头的横向排架进行优化设计，分析了码头各个构件在承载能力极限状态下的最优尺寸，再重新计算构件的抗力，并通过ANSYS中的概率模块PDS重新分析了码头各个构件的可靠指标。研究得到各个构件可靠指标在达到规范要求的基础上，较原来的可靠指标均有所下降，部分构件接近安全与经济的平衡点，达到了节约资源与减少投资的目的。
[Abstract]:After the three Gorges reservoir was impounded, the hydrological conditions of the reservoir area have changed greatly and the unique geological conditions of the reservoir area have taken place. In the construction of the vertical frame wharf with large water level difference of inland river, the use of steel retaining tube of pile foundation can be considered to realize the high efficiency of the connecting member under the construction water level. Rapid welding. In view of the structure of hydraulic wharf under combined stress of steel retaining tube and reinforced concrete in Chongqing Orchard Wharf Phase II Project, a numerical model considering the combined force of steel retaining tube and reinforced concrete is established for mechanical performance analysis. Then, the reliability of the reinforced concrete pile with large water level difference wharf is discussed. The research results have some reference value for the design and construction of the wharf in the three Gorges reservoir area. Firstly, the static analysis of the vertical frame wharf with large water level difference in the inner river is carried out by using ANSYS, and the mechanical transfer characteristics and the weak links of the wharf are discussed, which lays a foundation for the reliability analysis below. Then, combining the Monte Carlo method with the probability calculation module in ANSYS, the reliability analysis and sensitivity analysis of each component of the vertical frame wharf with large water level difference in the inner river are carried out. In this paper, the reliability index of each component of the transverse bent frame under different working conditions is analyzed. The influence of each random input variable on the reliability index of the component is discussed through sensitivity analysis. In view of the reliability, the reliability of the component is analyzed. The conclusions of the analysis, The reliability index of each component of the pier is greater than 3.5 of the specification and some of the components are far larger than the 3.5 required by the code. Therefore, it is necessary to optimize the design of the wharf structure to reduce the economic investment and waste of resources. Finally, the optimal design of the transverse bent structure of the wharf is carried out by using the optimization design module Opt in ANSYS, and the optimum dimensions of each member of the wharf under the limit state of bearing capacity are analyzed, and then the resistance of the member is re-calculated. The reliability index of each member of wharf is reanalyzed by the probability module PDS in ANSYS. The reliability index of each component is lower than that of the original reliability index on the basis of meeting the requirements of the specification. Some components are close to the balance point of safety and economy, and achieve the purpose of saving resources and reducing investment.
【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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