内河架空墩式码头结构性能退化研究及可靠度分析

发布时间：2018-04-25 22:15

本文选题：架空墩式码头 + 性能退化　；参考：《重庆交通大学》2015年硕士论文

【摘要】：在设计基准期内,港口工程钢筋混凝土结构在自然环境和荷载等作用下,材料强度随时间的退化,导致受力构件的抗力随时间发生衰减,最终导致码头结构的承载能力的逐渐退化。本文以重钢石灰石运输系统扩能改造项目码头工程为依托,根据内河架空墩式码头在运营期间载荷环境的特点,结合水位的升降过程,分别以船舶撞击力、船舶系缆力、水流力为主导可变作用,分析各荷载模型下靠船墩桩基和立柱在不同荷载工况组合下的受力情况;将抗力基本参数经时变化规律和统计特征引入受力构件抗力计算公式,计算抗力的时变统计值;应用可靠度理论对受力构件承载能力进行可靠度分析。主要完成以下工作:首先,从构件强度退化为出发点,分析总结前人对于港口工程钢筋混凝土结构强度的退化理论,根据规范上的受力构件抗力计算公式,综合考虑抗力基本参数随时间变化规律和统计特征,分析计算抗力随时间的变化值。基于港口工程结构可靠度理论,对作用在港工结构上的荷载效应的分布参数进行统计分析,为下文进行可靠度分析做准备。然后,结合工程实例,利用有限元软件ANSYS对架空墩式码头靠船墩进行静力计算,分别以船舶系缆力、船舶撞击力、水流力为主导可变作用,对各不同工况组合下各受力构件的弯矩、剪力、轴力效应进行分析。最后,结合结构可靠度的理论,建立港口工程结构承载能力极限方程,根据JC法的迭代流程通过编程对各主要受力构件在结构使用期期内各代表时刻的时变可靠指标进行求解并分析。
[Abstract]:During the design reference period, under the action of natural environment and load, the material strength of the reinforced concrete structure of port engineering degenerates with time, which results in the resistance of the subjected members to decay with time. Finally, it leads to the gradual degradation of the bearing capacity of the wharf structure. Based on the project of capacity expansion and reconstruction of limestone transportation system of Chongqing Iron and Steel Company, according to the characteristics of loading environment of inland river piers during operation, combined with the rising and falling process of water level, the paper uses the impact force of ship and the cable force of ship respectively. The flow force is the dominant variable action, the stress of pile foundation and column under different load conditions under various load models is analyzed, and the basic parameters of resistance are introduced into the formula of resistance calculation. The time-varying statistical value of resistance is calculated, and the reliability analysis of the bearing capacity of the bearing member is carried out by using the reliability theory. The main works are as follows: firstly, from the point of view of strength degradation of members, this paper analyzes and summarizes the previous theories of strength degradation of reinforced concrete structures in port engineering. Considering the variation of basic parameters of resistance with time and statistical characteristics, the variation value of resistance with time is analyzed and calculated. Based on the reliability theory of port engineering structure, the distribution parameters of load effect on port structure are statistically analyzed, and the reliability analysis is made for the following analysis. Then, combined with the engineering example, the static calculation of the pier of the overhead pier is carried out by using the finite element software ANSYS. The main variable functions are the ship cable force, the ship impact force and the water current force, respectively. The effects of bending moment, shear force and axial force on the members under different working conditions are analyzed. Finally, combined with the theory of structural reliability, the limit equation of loading capacity of port engineering structure is established. According to the iterative procedure of JC method, the time-varying reliability indexes of each main force member during the life of the structure are solved and analyzed by programming.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U656.1

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