海洋环境下混凝土结构腐蚀损伤及框架结构地震响应分析
发布时间：2019-04-11 11:00
【摘要】：我国是一个海洋大国,开发和利用海洋已成为国家实现国民经济可持续发展的一项基本国策,建设港口、海洋平台等海洋基础设施工程是实施海洋资源开发战略的基本需要。然而,海洋环境下的工程结构耐久性性能退化严重,特别是钢筋混凝土结构遭受氯盐和硫酸盐等侵蚀介质的腐蚀作用,不仅引起混凝土结构的耐久性退化,而且导致结构的抗震性能降低,造成海洋混凝土结构的服役寿命缩短和抗震安全性下降。为了评估海洋环境下混凝土结构服役安全性和可靠性,本文在考虑腐蚀影响混凝土材料和钢筋材料本构关系的前提下,基于CANNY软件的平台,开展海洋环境下混凝土结构的地震响应与抗震性能随时间的变化规律。主要内容及结果如下： (1)首先以硫酸盐侵蚀过程中腐蚀程度(侵蚀时间)对混凝土本构关系的影响为例,根据化学腐蚀和应力腐蚀过程中的强度退化规律,获得了一定腐蚀程度下的混凝土强度,并以该强度为基本参数,建立了不同腐蚀程度下混凝土强度与其应力—应变曲线特征值之间的关系,通过对混凝土三线性本构模型特征参数进行修正,获得了硫酸盐腐蚀过程中考虑腐蚀影响的混凝土本构模型。 (2)然后以氯盐侵蚀过程中腐蚀程度(侵蚀时间)对钢筋本构关系的影响为例,根据钢筋在均匀腐蚀、坑蚀以及均匀腐蚀和坑蚀共同作用下的腐蚀速度模型,通过确定模型参数(钢筋初始锈蚀时间),便可得到钢筋的截面锈蚀率,并以其为基本参数,建立了不同腐蚀程度下钢筋截面锈蚀率与其本构模型特征参数之间的关系,获得了氯盐腐蚀过程中考虑腐蚀引起截面锈蚀率影响的钢筋本构模型。 (3)运用CANNY软件,通过考虑腐蚀对混凝土与钢筋材料本构关系的影响,建立了腐蚀条件下混凝土结构抗震分析的有限元分析模型,从而对腐蚀10年的某一五层框架结构与未腐蚀结构进行多遇地震作用下的地震响应对比分析,主要研究其顶层水平位移时程、各层最大水平位移、层剪力以及层间位移角的变化情况,同时研究了随着腐蚀年限的增长,结构地震响应的变化情况。 (4)利用MS单元模型对某一五层三跨混凝土框架结构在不同腐蚀年限下进行罕遇地震作用下的能量时程分析,一方面研究不同腐蚀年限下结构内部构件滞回耗能的分布情况；另一方面研究不同腐蚀年限下的结构,由塑性累积损伤引起的结构内部构件能量转移过程的变化情况,根据时程分析结果,得到结构杆件两端出现塑性铰的时间和位置,研究不同腐蚀年限下结构内部能量分布随局部构件屈服后的变化情况。
[Abstract]:China is a large marine country. The exploitation and utilization of the ocean has become a basic national policy to realize the sustainable development of the national economy. The construction of ports, offshore platforms and other marine infrastructure projects are the basic needs for the implementation of the marine resources development strategy. However, the durability of engineering structures in marine environment is seriously degraded, especially the corrosion of reinforced concrete structures by chloride and sulfate, which not only causes the durability degradation of concrete structures, but also decreases the durability of concrete structures. Moreover, the seismic performance of the structure is reduced, and the service life and the seismic safety of the marine concrete structure are shortened. In order to evaluate the safety and reliability of concrete structures in marine environment, this paper takes into account the influence of corrosion on the constitutive relationship of concrete materials and reinforcement materials, and based on the platform of CANNY software. The time-dependent variation of seismic response and seismic performance of concrete structures in marine environment is studied. The main contents and results are as follows: (1) taking the effect of corrosion degree (erosion time) on the constitutive relation of concrete during sulfate corrosion as an example, according to the law of strength degradation in the process of chemical corrosion and stress corrosion, The strength of concrete under certain degree of corrosion is obtained, and the relationship between the strength of concrete and the characteristic value of stress-strain curve under different corrosion degree is established with this strength as the basic parameter, and the relationship between the strength and the characteristic value of the stress-strain curve is established. By modifying the characteristic parameters of the trilinear constitutive model of concrete, the constitutive model of concrete considering the effect of corrosion in sulfate corrosion process is obtained. (2) taking the influence of corrosion degree (erosion time) on the constitutive relation of steel bar as an example, according to the corrosion velocity model of steel bar under uniform corrosion, pit corrosion and co-action of uniform corrosion and pit corrosion, the effect of corrosion degree (erosion time) on the constitutive relation of steel bar is taken as an example. By determining the parameters of the model (initial corrosion time of steel bar), the corrosion rate of steel bar section can be obtained, and the relationship between the corrosion rate of steel bar section and the characteristic parameters of constitutive model under different corrosion degree can be established by taking it as the basic parameter, and the relationship between the corrosion rate of steel bar section and the characteristic parameters of constitutive model can be established. A constitutive model of steel bars considering the effect of corrosion-induced cross-section corrosion rate in chloride corrosion process is obtained. (3) by using CANNY software and considering the influence of corrosion on the constitutive relationship between concrete and steel, a finite element analysis model for seismic analysis of concrete structures under corrosive conditions is established. Therefore, the seismic response of a five-story frame structure corroded for 10 years is compared with that of an uncorroded structure under multiple earthquakes, and the time history of horizontal displacement of the top floor and the maximum horizontal displacement of each layer are mainly studied. The changes of shear force and displacement angle between layers are studied. The seismic response of structures with the increase of corrosion life is also studied. (4) the energy time history analysis of a five-story three-span concrete frame structure under different corrosion life is carried out by using MS element model. On the one hand, the distribution of hysteretic energy dissipation of internal members of a five-story concrete frame structure under different corrosion life is studied. On the other hand, according to the results of time history analysis, the time and position of plastic hinge at both ends of structural member are obtained according to the change of energy transfer process caused by plastic cumulative damage. The variation of energy distribution in the structure with the yield of the local members under different corrosion ages is studied.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV33;TV312
本文编号：2456357
[Abstract]:China is a large marine country. The exploitation and utilization of the ocean has become a basic national policy to realize the sustainable development of the national economy. The construction of ports, offshore platforms and other marine infrastructure projects are the basic needs for the implementation of the marine resources development strategy. However, the durability of engineering structures in marine environment is seriously degraded, especially the corrosion of reinforced concrete structures by chloride and sulfate, which not only causes the durability degradation of concrete structures, but also decreases the durability of concrete structures. Moreover, the seismic performance of the structure is reduced, and the service life and the seismic safety of the marine concrete structure are shortened. In order to evaluate the safety and reliability of concrete structures in marine environment, this paper takes into account the influence of corrosion on the constitutive relationship of concrete materials and reinforcement materials, and based on the platform of CANNY software. The time-dependent variation of seismic response and seismic performance of concrete structures in marine environment is studied. The main contents and results are as follows: (1) taking the effect of corrosion degree (erosion time) on the constitutive relation of concrete during sulfate corrosion as an example, according to the law of strength degradation in the process of chemical corrosion and stress corrosion, The strength of concrete under certain degree of corrosion is obtained, and the relationship between the strength of concrete and the characteristic value of stress-strain curve under different corrosion degree is established with this strength as the basic parameter, and the relationship between the strength and the characteristic value of the stress-strain curve is established. By modifying the characteristic parameters of the trilinear constitutive model of concrete, the constitutive model of concrete considering the effect of corrosion in sulfate corrosion process is obtained. (2) taking the influence of corrosion degree (erosion time) on the constitutive relation of steel bar as an example, according to the corrosion velocity model of steel bar under uniform corrosion, pit corrosion and co-action of uniform corrosion and pit corrosion, the effect of corrosion degree (erosion time) on the constitutive relation of steel bar is taken as an example. By determining the parameters of the model (initial corrosion time of steel bar), the corrosion rate of steel bar section can be obtained, and the relationship between the corrosion rate of steel bar section and the characteristic parameters of constitutive model under different corrosion degree can be established by taking it as the basic parameter, and the relationship between the corrosion rate of steel bar section and the characteristic parameters of constitutive model can be established. A constitutive model of steel bars considering the effect of corrosion-induced cross-section corrosion rate in chloride corrosion process is obtained. (3) by using CANNY software and considering the influence of corrosion on the constitutive relationship between concrete and steel, a finite element analysis model for seismic analysis of concrete structures under corrosive conditions is established. Therefore, the seismic response of a five-story frame structure corroded for 10 years is compared with that of an uncorroded structure under multiple earthquakes, and the time history of horizontal displacement of the top floor and the maximum horizontal displacement of each layer are mainly studied. The changes of shear force and displacement angle between layers are studied. The seismic response of structures with the increase of corrosion life is also studied. (4) the energy time history analysis of a five-story three-span concrete frame structure under different corrosion life is carried out by using MS element model. On the one hand, the distribution of hysteretic energy dissipation of internal members of a five-story concrete frame structure under different corrosion life is studied. On the other hand, according to the results of time history analysis, the time and position of plastic hinge at both ends of structural member are obtained according to the change of energy transfer process caused by plastic cumulative damage. The variation of energy distribution in the structure with the yield of the local members under different corrosion ages is studied.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV33;TV312
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