基于钢筋性能退化的在役板桩码头承载能力研究

发布时间：2018-03-05 07:44

本文选题：板桩码头　切入点：锈蚀开裂　出处：《天津大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前我国现役板桩码头许多已服役数十年，存在着不同程度的病损，由此对剩余使用寿命期内的在役板桩码头的受力状态变化分析提出了需要。前人在关于旧损结构承载力退化及其有限元建模等方面的研究取得了丰硕的成果，根据已有的研究成果总结推导对应的材料损失及性能退化与时间之间的数学关系，即可对基于构件材料损失及性能退化速率下的板桩码头受力状态进行分析和探索。本文以单锚板桩码头简化模型为例，基于钢筋混凝土构件锈蚀开裂的相关理论，建立单锚板桩码头桩土接触二维有限元模型。从钢筋锈蚀截面损失随时间的变化率入手，推导出锈蚀钢筋性能退化模型，依据各钢筋性能的退化参数对板桩码头整体结构进行旧损处理，考察板桩墙的时变受力状态及其变化规律。得出了基于钢筋性能退化参数的板桩变形、钢筋应变、关键区域混凝土的应力、应变及其裂缝发展情况等随时间的变化规律，，为更全面地了解板桩码头旧损过程对码头整体承载力的影响提供了新的研究方法，并为板桩码头优化设计及旧损板桩码头的修复、降级使用等提供了依据。
[Abstract]:At present, many of the existing plate pile wharves in our country have been in service for decades, and there are varying degrees of disease and damage. Therefore, it is necessary to analyze the stress state of the in-service plate pile wharf during the remaining service life. The previous researches on the bearing capacity degradation and finite element modeling of the old damaged structure have achieved fruitful results. According to the existing research results, the mathematical relationship between material loss and performance degradation and time is deduced, and the stress state of sheet pile wharf based on component material loss and performance degradation rate is analyzed and explored. In this paper, the simplified model of single anchor plate pile wharf is taken as an example. Based on the theory of corrosion cracking of reinforced concrete member, a two-dimensional finite element model of pile-soil contact of single anchor plate pile wharf is established. The performance degradation model of corroded steel bar is derived. According to the degradation parameters of each reinforcing bar, the whole structure of sheet pile wharf is treated with old damage. The time-varying stress state and its variation law of slab pile wall are investigated. The time-varying law of plate pile deformation, reinforcement strain, concrete stress, strain and crack development in key area based on the parameters of steel bar performance degradation are obtained. This paper provides a new research method for understanding the influence of the old damage process on the overall bearing capacity of the sheet-pile wharf, and provides the basis for the optimization design of the sheet-pile wharf, the repair and downgrade use of the old damaged plank-pile wharf, etc.
【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】：U656.1

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