【作者】 张大伟；

【导师】 顾祥林；

【作者基本信息】 同济大学 ， 结构工程， 2007， 硕士

【摘要】 在系统总结碳纤维布约束混凝土柱轴心受压性能和不同环境下纤维加固混凝土结构耐久性研究现状的基础上，对不同环境作用下碳纤维布约束混凝土轴心受压性能进行了试验研究和理论分析。设计包括对比试件在内的670个混凝土轴心受压圆柱试件，选取标准养护、自然淋雨、自然不淋雨、淡水浸泡和硫酸盐浸泡5种环境，进行环境作用，希望通过长期的试验(设计的试验时间约10年)建立不同环境下碳纤维布约束混凝土力学性能变化规律。其中环境作用时间以90天为一个周期，统一采用100吨压力试验机试件进行单轴受压试验。截至当前，已对270个试件进行单轴受压试验，根据试验结果，分析了不同环境影响下约束混凝土试件强度随时间的变化规律并对变化机理作了探讨，提出了考虑时间因素的环境影响下碳纤维约束混凝土的本构模型。同时，结合所做的耐久性试验的特性，对耐久性试验的试验方法做了初步探讨。利用数值模拟的方法研究了偏压约束钢筋混凝土柱的荷载、位移随时间的变化规律，同时探讨了偏心率和混凝土强度等级对偏压约束混凝土柱的承载能力的影响。更多还原

【Abstract】 Based on the state of the art of the compressive performance of concrete confined with carbon fiber composite sheets and the durability of structures strengthened with FRP, the behaviors of concrete confined with CFRP sheets under different environmental conditions are studied by experimental investigation and theoretical analysis. : . .Axially compressive tests of 670 concrete cylinders under different environments, which include standard curing, outdoor-with-rain, outdoor-without-rain, water and sulfate solution environment, were planned to study the long term performance of concrete confined with carbon fiber composite sheets. 270 Specimens were axially compressed after they have been processed for every 90 days. The environment influence on the strength of concrete wrapped with CFRP sheets is studied and the reasons for strength changing are discussed. Constitutive models of concrete wrapped with CFRP sheets under different environmental conditions are proposed based on the experiment results up to now. A numerical simulation method to calculate the response of eccentrically compressed reinforced concrete columns confined with CFRP sheets is developed, and the changes of bearing and deforming capacity of columus with the time are investigated considering the influence of the environment. The basic relationship between the ultimate bearing capacity of the columns and the eccentric ratio or concrete strength is studied through numerical simulation tests.更多还原