早龄期混凝土结构性能时变规律研究
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摘要
由于水泥水化过程在早龄期尚未完成,混凝土强度和粘结性能随混凝土龄期不断变化,混凝土结构性能也在不断变化,早龄期混凝土结构与正常使用阶段的混凝土结构有着本质的不同。系统研究早龄期混凝土结构的受力特征和结构性能的时变规律,对钢筋混凝土结构施工期的安全性分析与控制以及钢筋混凝土结构全寿命分析具有重要的理论意义和实际价值。
早龄期混凝土结构承载性能分析需要解决三个主要问题:混凝土强度随龄期的时变规律;早龄期钢筋与混凝土粘结—滑移本构关系的建立;早龄期钢筋混凝土结构构件承载力计算方法。论文围绕“材料性能—粘结性能—承载力性能”这一主线,采用现场调查、试验研究和数值模拟的方法,系统研究了早龄期钢筋混凝土受弯构件和偏压构件承载性能的时变规律。主要的研究工作如下:
对西安市、咸阳市及其周边县市近年来新建混凝土结构的抗力进行了调查测试,取得了混凝土强度和钢筋性能以及各类钢筋混凝土构件主要几何尺寸的实测数据,应用概率统计方法对进行了统计分析,给出了混凝土强度、钢筋性能和构件尺寸特征的统计参数。有针对性地调查分析了制备方式和浇筑工艺及施工水平对混凝土强度的影响、生产水平对钢筋性能的影响以及施工水平对构件几何参数的影响。
采用试验研究和现场调查相结合的方法,研究了粉煤灰混凝土早期强度的时变规律和影响因素,分析了养护时间对粉煤灰混凝土强度时变规律的影响,对比了28天标准养护、同条件养护和实际结构混凝土强度的异同,分析了实际结构中不同构件类型混凝土强度增长的差异。
通过试验研究了粉煤灰混凝土90天抗压强度与回弹值和碳化深度之间的关系,分析了粉煤灰混凝土300天内自然碳化的发展规律,建立了粉煤灰混凝土早龄期回弹法的测强曲线,为回弹法应用于早龄期粉煤灰混凝土的强度检测提供了科学依据。
对各种粘结性能试验方法进行了分析,确定了早龄期粉煤灰混凝土粘结性能的试验方案。采用拉拔试验和梁式试验方法,系统研究了粉煤灰混凝土粘结性能随龄期的时变规律和主要影响因素(混凝土强度、粉煤灰掺量、钢筋种类及直径、试验方法等),给出了早龄期粉煤灰混凝土极限粘结应力的计算公式,回归分析建立了早龄期粉煤灰混凝土的粘结滑移本构关系。对拉拔试验及梁式试验进行了数值模拟,有限元分析结果与试验结果吻合较好。
对早龄期受弯构件进行了承载力试验研究,分析了早龄期钢筋混凝土受弯构件的受力特征和破坏机理。建立了早龄期钢筋混凝土受弯和偏压构件的有限元分析模型,结合试验结果和有限元分析结果,运用极限平衡理论,建立了早龄期钢筋混凝土构件正截面承载力的计算方法,并分析了早龄期钢筋混凝土构件承载力的时变规律。
Because the cement hydration process has not been completed at early age, the concrete strength and bond properties with the changing age of concrete, concrete structure properties are constantly changing, early age concrete structure and concrete structure during normal use are essentially different. The force characteristics of early age concrete structural elements is systemly studied and time-varying resistance model is established, which has important theoretical and practical value to reinforced concrete construction security analysis and control and life cycle analysis of reinforced concrete structures.
There are three main problems to be solved for the bearing capacity calculation of early age reinforced concrete structures: the time-varying law of concrete strength changing with age; the establishment of bond - slip constitutive of early age fly ash concrete; the calculation method of the early age reinforced concrete structures bearing. Thesis, this paper around the "material properties - bond performance - capacity performance" of the main line, using on-site investigations, experimental research and numerical simulation method, the system of the early age of reinforced concrete beam and the bearing capacity of eccentrically compressed time-varying law. The main research work are as follows:
Taking the typical multi-storey and high-rise residential buildings in Xi’an and Xianyang city and their periphery county city as research objects, more than 1000 residences built in recent four years are investigated, the actual data measured are obtained such date as concrete and steel strength as well as the dimension parameters of all kinds of RC members. According to the statistics analysis, probability distributions and statistics parameters of the resistance of building materials and structural members are studied. At the same time, some influencing factor of material function and dimension parameters are analyzed.
Adopting combine methods of experimental studies and field investigations, the increase of the early strength of fly ash concrete and the impact of curing time on the increase law is studied, the increase law differences of the cubic concrete compressive strength, the same condition curing strength and the actual structural strength is compared, and the increase law differences of the different type component strength is compared.
The relationship among compressive strength, rebound values and the carbonation depth within 90 days after pouring is analyzed, the carbonization development law of the fly ash concretes in early 300 days under the natural condition is established through the experiment, the rebound regression equation of different fly ash content is established, which provided a scientific basis for the rebound method used in early age fly ash concrete strength testing.
According to various advantages and disadvantages of bonding performance test method to determine the early age properties of fly ash concrete bond test program. Through the pull-out test on bonding properties of fly ash concrete time-varying with the age rule is analyzed, combined with fly ash concrete beam test of the main factors affecting bond behavior (strength of concrete, fly ash, steel type and diameter, test methods, etc.) were systematically studied to establish the early age of fly ash concrete ultimate bond stress formula, regression analysis, the early age of fly ash concrete bond-slip constitutive relation. The finite element analysis model built on the pullout test and beam test carried out numerical simulation, finite element analysis and experimental results agree well.
On the basis of finite element analysis of early age flexural members, the force characteristics of early age reinforced concrete flexural member and compression members are analyzed. For the force characteristics of early age reinforced concrete beam, the use of limit equilibrium theory, the capacity calculation model of early age RC flexural member is established. Through the test verification, the calculation model is in good agreement with the experimental results. On this basis, the bearing capacity time-varying law of early age reinforced concrete flexural strength and compression members is analyzed.
早龄期混凝土结构承载性能分析需要解决三个主要问题:混凝土强度随龄期的时变规律;早龄期钢筋与混凝土粘结—滑移本构关系的建立;早龄期钢筋混凝土结构构件承载力计算方法。论文围绕“材料性能—粘结性能—承载力性能”这一主线,采用现场调查、试验研究和数值模拟的方法,系统研究了早龄期钢筋混凝土受弯构件和偏压构件承载性能的时变规律。主要的研究工作如下:
对西安市、咸阳市及其周边县市近年来新建混凝土结构的抗力进行了调查测试,取得了混凝土强度和钢筋性能以及各类钢筋混凝土构件主要几何尺寸的实测数据,应用概率统计方法对进行了统计分析,给出了混凝土强度、钢筋性能和构件尺寸特征的统计参数。有针对性地调查分析了制备方式和浇筑工艺及施工水平对混凝土强度的影响、生产水平对钢筋性能的影响以及施工水平对构件几何参数的影响。
采用试验研究和现场调查相结合的方法,研究了粉煤灰混凝土早期强度的时变规律和影响因素,分析了养护时间对粉煤灰混凝土强度时变规律的影响,对比了28天标准养护、同条件养护和实际结构混凝土强度的异同,分析了实际结构中不同构件类型混凝土强度增长的差异。
通过试验研究了粉煤灰混凝土90天抗压强度与回弹值和碳化深度之间的关系,分析了粉煤灰混凝土300天内自然碳化的发展规律,建立了粉煤灰混凝土早龄期回弹法的测强曲线,为回弹法应用于早龄期粉煤灰混凝土的强度检测提供了科学依据。
对各种粘结性能试验方法进行了分析,确定了早龄期粉煤灰混凝土粘结性能的试验方案。采用拉拔试验和梁式试验方法,系统研究了粉煤灰混凝土粘结性能随龄期的时变规律和主要影响因素(混凝土强度、粉煤灰掺量、钢筋种类及直径、试验方法等),给出了早龄期粉煤灰混凝土极限粘结应力的计算公式,回归分析建立了早龄期粉煤灰混凝土的粘结滑移本构关系。对拉拔试验及梁式试验进行了数值模拟,有限元分析结果与试验结果吻合较好。
对早龄期受弯构件进行了承载力试验研究,分析了早龄期钢筋混凝土受弯构件的受力特征和破坏机理。建立了早龄期钢筋混凝土受弯和偏压构件的有限元分析模型,结合试验结果和有限元分析结果,运用极限平衡理论,建立了早龄期钢筋混凝土构件正截面承载力的计算方法,并分析了早龄期钢筋混凝土构件承载力的时变规律。
Because the cement hydration process has not been completed at early age, the concrete strength and bond properties with the changing age of concrete, concrete structure properties are constantly changing, early age concrete structure and concrete structure during normal use are essentially different. The force characteristics of early age concrete structural elements is systemly studied and time-varying resistance model is established, which has important theoretical and practical value to reinforced concrete construction security analysis and control and life cycle analysis of reinforced concrete structures.
There are three main problems to be solved for the bearing capacity calculation of early age reinforced concrete structures: the time-varying law of concrete strength changing with age; the establishment of bond - slip constitutive of early age fly ash concrete; the calculation method of the early age reinforced concrete structures bearing. Thesis, this paper around the "material properties - bond performance - capacity performance" of the main line, using on-site investigations, experimental research and numerical simulation method, the system of the early age of reinforced concrete beam and the bearing capacity of eccentrically compressed time-varying law. The main research work are as follows:
Taking the typical multi-storey and high-rise residential buildings in Xi’an and Xianyang city and their periphery county city as research objects, more than 1000 residences built in recent four years are investigated, the actual data measured are obtained such date as concrete and steel strength as well as the dimension parameters of all kinds of RC members. According to the statistics analysis, probability distributions and statistics parameters of the resistance of building materials and structural members are studied. At the same time, some influencing factor of material function and dimension parameters are analyzed.
Adopting combine methods of experimental studies and field investigations, the increase of the early strength of fly ash concrete and the impact of curing time on the increase law is studied, the increase law differences of the cubic concrete compressive strength, the same condition curing strength and the actual structural strength is compared, and the increase law differences of the different type component strength is compared.
The relationship among compressive strength, rebound values and the carbonation depth within 90 days after pouring is analyzed, the carbonization development law of the fly ash concretes in early 300 days under the natural condition is established through the experiment, the rebound regression equation of different fly ash content is established, which provided a scientific basis for the rebound method used in early age fly ash concrete strength testing.
According to various advantages and disadvantages of bonding performance test method to determine the early age properties of fly ash concrete bond test program. Through the pull-out test on bonding properties of fly ash concrete time-varying with the age rule is analyzed, combined with fly ash concrete beam test of the main factors affecting bond behavior (strength of concrete, fly ash, steel type and diameter, test methods, etc.) were systematically studied to establish the early age of fly ash concrete ultimate bond stress formula, regression analysis, the early age of fly ash concrete bond-slip constitutive relation. The finite element analysis model built on the pullout test and beam test carried out numerical simulation, finite element analysis and experimental results agree well.
On the basis of finite element analysis of early age flexural members, the force characteristics of early age reinforced concrete flexural member and compression members are analyzed. For the force characteristics of early age reinforced concrete beam, the use of limit equilibrium theory, the capacity calculation model of early age RC flexural member is established. Through the test verification, the calculation model is in good agreement with the experimental results. On this basis, the bearing capacity time-varying law of early age reinforced concrete flexural strength and compression members is analyzed.
引文
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