海洋環(huán)境下混凝土結(jié)構(gòu)腐蝕損傷及框架結(jié)構(gòu)地震響應(yīng)分析
發(fā)布時(shí)間：2019-04-11 11:00
【摘要】：我國是一個(gè)海洋大國,開發(fā)和利用海洋已成為國家實(shí)現(xiàn)國民經(jīng)濟(jì)可持續(xù)發(fā)展的一項(xiàng)基本國策,建設(shè)港口、海洋平臺等海洋基礎(chǔ)設(shè)施工程是實(shí)施海洋資源開發(fā)戰(zhàn)略的基本需要。然而,海洋環(huán)境下的工程結(jié)構(gòu)耐久性性能退化嚴(yán)重,特別是鋼筋混凝土結(jié)構(gòu)遭受氯鹽和硫酸鹽等侵蝕介質(zhì)的腐蝕作用,不僅引起混凝土結(jié)構(gòu)的耐久性退化,而且導(dǎo)致結(jié)構(gòu)的抗震性能降低,造成海洋混凝土結(jié)構(gòu)的服役壽命縮短和抗震安全性下降。為了評估海洋環(huán)境下混凝土結(jié)構(gòu)服役安全性和可靠性,本文在考慮腐蝕影響混凝土材料和鋼筋材料本構(gòu)關(guān)系的前提下,基于CANNY軟件的平臺,開展海洋環(huán)境下混凝土結(jié)構(gòu)的地震響應(yīng)與抗震性能隨時(shí)間的變化規(guī)律。主要內(nèi)容及結(jié)果如下： (1)首先以硫酸鹽侵蝕過程中腐蝕程度(侵蝕時(shí)間)對混凝土本構(gòu)關(guān)系的影響為例,根據(jù)化學(xué)腐蝕和應(yīng)力腐蝕過程中的強(qiáng)度退化規(guī)律,獲得了一定腐蝕程度下的混凝土強(qiáng)度,并以該強(qiáng)度為基本參數(shù),建立了不同腐蝕程度下混凝土強(qiáng)度與其應(yīng)力—應(yīng)變曲線特征值之間的關(guān)系,通過對混凝土三線性本構(gòu)模型特征參數(shù)進(jìn)行修正,獲得了硫酸鹽腐蝕過程中考慮腐蝕影響的混凝土本構(gòu)模型。 (2)然后以氯鹽侵蝕過程中腐蝕程度(侵蝕時(shí)間)對鋼筋本構(gòu)關(guān)系的影響為例,根據(jù)鋼筋在均勻腐蝕、坑蝕以及均勻腐蝕和坑蝕共同作用下的腐蝕速度模型,通過確定模型參數(shù)(鋼筋初始銹蝕時(shí)間),便可得到鋼筋的截面銹蝕率,并以其為基本參數(shù),建立了不同腐蝕程度下鋼筋截面銹蝕率與其本構(gòu)模型特征參數(shù)之間的關(guān)系,獲得了氯鹽腐蝕過程中考慮腐蝕引起截面銹蝕率影響的鋼筋本構(gòu)模型。 (3)運(yùn)用CANNY軟件,通過考慮腐蝕對混凝土與鋼筋材料本構(gòu)關(guān)系的影響,建立了腐蝕條件下混凝土結(jié)構(gòu)抗震分析的有限元分析模型,從而對腐蝕10年的某一五層框架結(jié)構(gòu)與未腐蝕結(jié)構(gòu)進(jìn)行多遇地震作用下的地震響應(yīng)對比分析,主要研究其頂層水平位移時(shí)程、各層最大水平位移、層剪力以及層間位移角的變化情況,同時(shí)研究了隨著腐蝕年限的增長,結(jié)構(gòu)地震響應(yīng)的變化情況。 (4)利用MS單元模型對某一五層三跨混凝土框架結(jié)構(gòu)在不同腐蝕年限下進(jìn)行罕遇地震作用下的能量時(shí)程分析,一方面研究不同腐蝕年限下結(jié)構(gòu)內(nèi)部構(gòu)件滯回耗能的分布情況；另一方面研究不同腐蝕年限下的結(jié)構(gòu),由塑性累積損傷引起的結(jié)構(gòu)內(nèi)部構(gòu)件能量轉(zhuǎn)移過程的變化情況,根據(jù)時(shí)程分析結(jié)果,得到結(jié)構(gòu)桿件兩端出現(xiàn)塑性鉸的時(shí)間和位置,研究不同腐蝕年限下結(jié)構(gòu)內(nèi)部能量分布隨局部構(gòu)件屈服后的變化情況。
[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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV33;TV312
本文編號：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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV33;TV312
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