地震激勵下在役RC框架結(jié)構(gòu)力學行為研究
發(fā)布時間：2019-05-23 18:31
【摘要】：作為建筑結(jié)構(gòu)中的一種基本結(jié)構(gòu)體系，RC框架結(jié)構(gòu)以其結(jié)構(gòu)形式簡單、平面布置靈活、傳力路徑明確等優(yōu)點在我國乃至世界土木工程建設中扮演著重要角色。相對于其他新型結(jié)構(gòu)體系而言，大量的RC框架建筑已步入中、老齡甚至超齡階段，加之近年來我國及周邊鄰國的大區(qū)域地震活動預示中國大陸今后幾年發(fā)生7級左右地震的可能性較大，，對地震激勵下在役RC框架結(jié)構(gòu)多尺度損傷行為進行研究并給出最優(yōu)抗震設防建議迫在眉睫。 論文以多齡期RC框架結(jié)構(gòu)為研究對象，采用理論分析與數(shù)值模擬相結(jié)合的研究手段，探究了一般大氣環(huán)境下主要建筑材料力學性能劣化機理與時變規(guī)律，揭示了多尺度地震損傷演化規(guī)律，定量評價了結(jié)構(gòu)抗地震倒塌能力，最終獲取了抗震投入和震害損失間的最佳平衡。主要研究工作和研究結(jié)論有： （1）對RC結(jié)構(gòu)隨內(nèi)嵌鋼筋銹蝕而出現(xiàn)性能劣化的4個重要階段進行了界定，基于現(xiàn)場實測數(shù)據(jù)擬合得到了保護層混凝土碳化殘量的建議計算模型，并運用彈性力學理論推導出保護層混凝土開裂時鋼筋銹蝕率計算公式，揭示了混凝土抗拉強度、保護層厚度、縱筋直徑、鐵銹泊松比及銹脹率等主要因素的銹蝕敏感度，提出了內(nèi)嵌鋼筋未銹階段服役時間和保護層混凝土銹脹開裂時結(jié)構(gòu)服役時間的建議計算公式，最終給出了適用于多齡期RC框架結(jié)構(gòu)的鋼筋、混凝土及鋼筋與混凝土間粘結(jié)滑移時變本構(gòu)模型，為后續(xù)數(shù)值分析研究提供了基礎理論支持。 （2）基于ABAQUS軟件平臺，從單元選取與組合、混凝土破壞準則、材料時變本構(gòu)關(guān)系及模型可靠性驗證等方面探討了適用于在役RC框架結(jié)構(gòu)構(gòu)件尺度的數(shù)值建模理論，并根據(jù)建議的RC框架結(jié)構(gòu)諸類構(gòu)件損傷表征量選取規(guī)則，給出了兩類構(gòu)件的損傷評價指標，通過在未銹RC梁構(gòu)件抗彎剛度計算公式里引入粘結(jié)力修正函數(shù)以完成對受拉鋼筋位置處混凝土平均拉應變的調(diào)整，進而提出了銹蝕RC梁抗彎剛度建議計算公式，計算分析了截面尺寸、混凝土強度等級、混凝土保護層厚度及配筋率等設計參數(shù)的損傷敏感度，揭示了主要設計參數(shù)對構(gòu)件損傷演化的影響規(guī)律，為建立地震激勵下在役RC框架結(jié)構(gòu)損傷模型提供理論支撐。 （3）基于OpenSees軟件平臺，重點探討了RC構(gòu)件力學性能在纖維層面上的描述方法，建立了適用于在役RC框架結(jié)構(gòu)結(jié)構(gòu)尺度的非線性有限元數(shù)值建模理論，并給出了RC框架結(jié)構(gòu)宏觀尺度損傷評價指標，揭示了構(gòu)件類型和主要設計參數(shù)對樓層損傷的影響規(guī)律，提出了往復荷載作用下在役RC框架結(jié)構(gòu)樓層損傷模型，進一步考察了損傷樓層位置、損傷樓層數(shù)量、樓層損傷程度及結(jié)構(gòu)服役齡期對整體結(jié)構(gòu)地震損傷的影響，最終建立了適用于在役RC框架結(jié)構(gòu)的地震損傷模型。 （4）通過對地震動記錄和地震動強度指標選取準則的優(yōu)劣性進行評價，給出了用于RC框架結(jié)構(gòu)彈塑性地震響應數(shù)值分析的地震動記錄和地震動強度控制指標，并就借助IDA方法實現(xiàn)對結(jié)構(gòu)抗地震倒塌易損性分析所涉及的關(guān)鍵科學問題提供了解決方案，揭示了樓層高度、結(jié)構(gòu)高寬比、框架柱軸壓比及樓板約束強度等主要因素對典型銹蝕率下RC框架結(jié)構(gòu)抗地震倒塌能力的影響規(guī)律，最終完成了在役RC框架結(jié)構(gòu)抗地震倒塌能力的定量化評價。 （5）采用分部優(yōu)化法并借助復形法優(yōu)化思想獲取RC框架結(jié)構(gòu)在彈性階段的優(yōu)化方案，通過控制優(yōu)化結(jié)構(gòu)的最大層間位移角以實現(xiàn)彈塑性階段優(yōu)化設計，從而得到了指定設防烈度下RC框架結(jié)構(gòu)最小抗震投入的優(yōu)化設計，并基于簡化公式計算建筑結(jié)構(gòu)遭受諸級破壞的失效概率，與單體建筑震害損失量化結(jié)果形成了共力，最終獲得了指定設防烈度下框架結(jié)構(gòu)的損失期望，隨即將抗震投入最少和震害損失期望最小作為抗災結(jié)構(gòu)優(yōu)化設計的兩大優(yōu)化目標，取目標函數(shù)值達到最小時的設防烈度作為結(jié)構(gòu)最優(yōu)設防烈度，進而搜索得到最優(yōu)設防烈度下抗震投入與震害損失間的最佳平衡。
[Abstract]:As a basic structural system in the building structure, the RC frame structure plays an important role in the civil engineering construction of China and the world with the advantages of simple structure, flexible layout and clear force transmission path. With respect to other new structural systems, a large number of RC frame buildings have entered the middle, the aging and even the super-aging stage, and in recent years, the large-area seismic activity of our country and the surrounding neighboring countries indicates that the possibility of the earthquake in the Chinese mainland for the next few years is large, It is urgent to study the multi-scale damage behavior of the active RC frame structure under the earthquake excitation and give the optimal anti-seismic fortification. In this paper, a multi-age RC frame structure is used as the research object, and the research means of combining the theoretical analysis and the numerical simulation are adopted to explore the mechanism and time-varying law of the mechanical property degradation of the main building materials under the general atmospheric environment, and the evolution rules of the multi-scale earthquake damage are revealed. In this paper, the anti-seismic collapse capability of the structure is quantitatively evaluated, and the optimal level between the seismic input and the damage loss is finally obtained. Scale. Main research work and research conclusions The following results are as follows: (1)4 important stages of the performance degradation of RC structure with embedded steel bar corrosion are defined, and the suggestion of the residual amount of concrete carbonization of the protective layer is obtained based on the field-measured data fitting. The calculation formula of the corrosion rate of the steel bar in the crack of the protective layer concrete is derived by using the elastic mechanics theory, and the corrosion of the main factors such as the tensile strength of the concrete, the thickness of the protective layer, the diameter of the longitudinal bar, the Poisson's ratio of the rust and the scale of the rust and the like are revealed. In this paper, a formula for calculating the service time of the reinforced concrete and the structure service time of the concrete of the protective layer is proposed, and the time-varying time-varying between the reinforced concrete and the reinforced concrete and the concrete in the multi-age RC frame structure is finally given. The structure model provides the basis for the follow-up numerical analysis. On the basis of ABAQUS software platform, the number of component dimensions of RC frame structure is discussed from the aspects of unit selection and combination, concrete failure criterion, material time-varying constitutive relation and model reliability verification. The theory of value modeling is given, and according to the recommended RC frame structure, the damage evaluation index of the two types of components is given, and the cohesive force correction function is introduced in the calculation formula of the bending stiffness of the non-rust RC beam component to finish the average tensile force of the concrete at the position of the drawn steel bar. The calculation formula of the bending stiffness of the RC beam is proposed, and the damage sensitivity of the design parameters such as the cross-sectional dimension, the strength grade of the concrete, the thickness of the concrete protective layer and the reinforcement ratio is calculated and the damage evolution of the main design parameters to the component damage is revealed. The influence law of the structure of the RC frame structure in the service of the active RC frame under the earthquake excitation is proposed. For theoretical support, (3) Based on the OpenSees software platform, the paper mainly discusses the method of the description of the mechanical properties of the RC member on the fiber level, establishes the nonlinear finite element numerical modeling theory suitable for the structure scale of the in-service RC frame structure, and gives the macro scale of the RC frame structure. Based on the evaluation index of the degree of damage, the influence of the component type and the main design parameters on the floor damage is revealed, and the floor damage model of the active RC frame structure under the action of the reciprocating load is put forward, and the location of the damaged floor is further investigated. the effect of the number of the damaged floors, the degree of floor damage and the age of the structural service on the earthquake damage of the whole structure is finally established, The seismic damage model of RC frame structure is given in this paper. (4) The ground motion record of the elastic-plastic seismic response numerical analysis of RC frame structure is given by the evaluation of the good and bad of the ground motion record and the ground motion intensity index selection criterion. The ground motion intensity control index is used to provide a solution for the key scientific problems involved in the vulnerability analysis of the structural anti-seismic collapse by means of the IDA method, and the building is disclosed. The influence of the main factors, such as the height of the layer, the aspect ratio of the structure, the axial compression ratio of the frame column and the strength of the slab, on the anti-seismic collapse capability of the RC frame structure under the typical corrosion rate, and finally the anti-seismic inversion of the active RC frame structure (5) The optimization of the RC frame structure in the elastic phase is obtained by using the partial optimization method and the optimization of the structure of the RC frame structure by means of the complex method, and the maximum interlayer displacement angle of the RC frame structure is controlled by controlling the maximum interlayer displacement angle of the RC structure. The optimization design of the elastic-plastic phase is realized, and the optimal design of the minimum anti-seismic input of the RC frame structure with the specified fortification intensity is obtained, and the failure probability of the building structure subjected to the stage failure and the earthquake damage of the single building are calculated based on the simplified formula. The result of the loss quantification forms a common force, and finally obtains the loss expectation of the frame structure under the specified fortification intensity, and then the minimum of the seismic input and the expected minimum damage loss are the two optimization targets for the optimal design of the disaster-resistant structure, and the target function value is obtained for the most hour. As the optimal fortification intensity of the structure, the degree of seismic input of the optimal fortification intensity is further searched.
【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU375.4;TU311.3
本文編號：2484123
[Abstract]:As a basic structural system in the building structure, the RC frame structure plays an important role in the civil engineering construction of China and the world with the advantages of simple structure, flexible layout and clear force transmission path. With respect to other new structural systems, a large number of RC frame buildings have entered the middle, the aging and even the super-aging stage, and in recent years, the large-area seismic activity of our country and the surrounding neighboring countries indicates that the possibility of the earthquake in the Chinese mainland for the next few years is large, It is urgent to study the multi-scale damage behavior of the active RC frame structure under the earthquake excitation and give the optimal anti-seismic fortification. In this paper, a multi-age RC frame structure is used as the research object, and the research means of combining the theoretical analysis and the numerical simulation are adopted to explore the mechanism and time-varying law of the mechanical property degradation of the main building materials under the general atmospheric environment, and the evolution rules of the multi-scale earthquake damage are revealed. In this paper, the anti-seismic collapse capability of the structure is quantitatively evaluated, and the optimal level between the seismic input and the damage loss is finally obtained. Scale. Main research work and research conclusions The following results are as follows: (1)4 important stages of the performance degradation of RC structure with embedded steel bar corrosion are defined, and the suggestion of the residual amount of concrete carbonization of the protective layer is obtained based on the field-measured data fitting. The calculation formula of the corrosion rate of the steel bar in the crack of the protective layer concrete is derived by using the elastic mechanics theory, and the corrosion of the main factors such as the tensile strength of the concrete, the thickness of the protective layer, the diameter of the longitudinal bar, the Poisson's ratio of the rust and the scale of the rust and the like are revealed. In this paper, a formula for calculating the service time of the reinforced concrete and the structure service time of the concrete of the protective layer is proposed, and the time-varying time-varying between the reinforced concrete and the reinforced concrete and the concrete in the multi-age RC frame structure is finally given. The structure model provides the basis for the follow-up numerical analysis. On the basis of ABAQUS software platform, the number of component dimensions of RC frame structure is discussed from the aspects of unit selection and combination, concrete failure criterion, material time-varying constitutive relation and model reliability verification. The theory of value modeling is given, and according to the recommended RC frame structure, the damage evaluation index of the two types of components is given, and the cohesive force correction function is introduced in the calculation formula of the bending stiffness of the non-rust RC beam component to finish the average tensile force of the concrete at the position of the drawn steel bar. The calculation formula of the bending stiffness of the RC beam is proposed, and the damage sensitivity of the design parameters such as the cross-sectional dimension, the strength grade of the concrete, the thickness of the concrete protective layer and the reinforcement ratio is calculated and the damage evolution of the main design parameters to the component damage is revealed. The influence law of the structure of the RC frame structure in the service of the active RC frame under the earthquake excitation is proposed. For theoretical support, (3) Based on the OpenSees software platform, the paper mainly discusses the method of the description of the mechanical properties of the RC member on the fiber level, establishes the nonlinear finite element numerical modeling theory suitable for the structure scale of the in-service RC frame structure, and gives the macro scale of the RC frame structure. Based on the evaluation index of the degree of damage, the influence of the component type and the main design parameters on the floor damage is revealed, and the floor damage model of the active RC frame structure under the action of the reciprocating load is put forward, and the location of the damaged floor is further investigated. the effect of the number of the damaged floors, the degree of floor damage and the age of the structural service on the earthquake damage of the whole structure is finally established, The seismic damage model of RC frame structure is given in this paper. (4) The ground motion record of the elastic-plastic seismic response numerical analysis of RC frame structure is given by the evaluation of the good and bad of the ground motion record and the ground motion intensity index selection criterion. The ground motion intensity control index is used to provide a solution for the key scientific problems involved in the vulnerability analysis of the structural anti-seismic collapse by means of the IDA method, and the building is disclosed. The influence of the main factors, such as the height of the layer, the aspect ratio of the structure, the axial compression ratio of the frame column and the strength of the slab, on the anti-seismic collapse capability of the RC frame structure under the typical corrosion rate, and finally the anti-seismic inversion of the active RC frame structure (5) The optimization of the RC frame structure in the elastic phase is obtained by using the partial optimization method and the optimization of the structure of the RC frame structure by means of the complex method, and the maximum interlayer displacement angle of the RC frame structure is controlled by controlling the maximum interlayer displacement angle of the RC structure. The optimization design of the elastic-plastic phase is realized, and the optimal design of the minimum anti-seismic input of the RC frame structure with the specified fortification intensity is obtained, and the failure probability of the building structure subjected to the stage failure and the earthquake damage of the single building are calculated based on the simplified formula. The result of the loss quantification forms a common force, and finally obtains the loss expectation of the frame structure under the specified fortification intensity, and then the minimum of the seismic input and the expected minimum damage loss are the two optimization targets for the optimal design of the disaster-resistant structure, and the target function value is obtained for the most hour. As the optimal fortification intensity of the structure, the degree of seismic input of the optimal fortification intensity is further searched.
【學位授予單位】：西安建筑科技大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU375.4;TU311.3
【參考文獻】
相關(guān)期刊論文 前10條
1 梁益;陸新征;李易;葉列平;江見鯨;;樓板對結(jié)構(gòu)抗連續(xù)倒塌能力的影響[J];四川建筑科學研究;2010年02期
2 李笑然;王元豐;;含水率和腐蝕因素對鋼筋混凝土柱抗震性能的影響[J];北京交通大學學報;2011年01期
3 杜修力;韓強;李忠獻;李立云;陳少峰;趙建鋒;;5．12汶川地震中山區(qū)公路橋梁震害及啟示[J];北京工業(yè)大學學報;2008年12期
4 江近仁,孫景江;磚結(jié)構(gòu)的地震破壞模型[J];地震工程與工程振動;1987年01期
5 吳波,李藝華;RC框架結(jié)構(gòu)薄弱層的層間位移可靠度水平考察[J];地震工程與工程振動;2003年06期
6 葉列平;馬千里;繆志偉;;結(jié)構(gòu)抗震分析用地震動強度指標的研究[J];地震工程與工程振動;2009年04期
7 呂大剛;于曉輝;宋鵬彥;張鵬;王光遠;;抗震結(jié)構(gòu)最優(yōu)設防水平?jīng)Q策與全壽命優(yōu)化設計的簡化易損性分析方法[J];地震工程與工程振動;2009年04期
8 呂大剛;于曉輝;王光遠;;基于單地震動記錄IDA方法的結(jié)構(gòu)倒塌分析[J];地震工程與工程振動;2009年06期
9 牛荻濤，任利杰;改進的鋼筋混凝土結(jié)構(gòu)雙參數(shù)地震破壞模型[J];地震工程與工程振動;1996年04期
10 劉伯權(quán),白紹良,劉鳴;抗震結(jié)構(gòu)的等效延性破壞準則及其子結(jié)構(gòu)試驗驗證[J];地震工程與工程振動;1997年03期
相關(guān)博士學位論文 前2條
1 李磊;混合結(jié)構(gòu)的數(shù)值建模理論及在地震工程中的應用[D];西安建筑科技大學;2011年
2 王斌;型鋼高強高性能混凝土構(gòu)件及其框架結(jié)構(gòu)的地震損傷研究[D];西安建筑科技大學;2010年
本文編號：2484123
本文鏈接：http://sikaile.net/kejilunwen/sgjslw/2484123.html
