基于氯盐最不利侵蚀下锈蚀RC框架结构时变地震易损性研究

发布时间：2018-05-02 01:58

本文选题：氯离子 + RC框架结构　；参考：《振动与冲击》2015年07期

【摘要】：基于一维Fick第二定律,采用Dura Crete规范中钢筋锈蚀初始时刻的概率预测模型,并基于概率统计的钢筋直径预测模型,计算不同龄期下RC结构中钢筋的锈蚀深度。基于修正斜压场理论并以锈蚀深度为单变量,对不同龄期下受压区锈胀开裂混凝土峰值应力进行计算;根据锈蚀深度对钢筋本构和Mander约束混凝土本构模型中相关参数进行了修正。于地震易损性模型中引入时间参数,建立含时间参数的RC结构地震易损性模型。最后,基于上述材料力学性能退化模型,采用基于力的纤维塑性铰模型,建立三层RC平面框架结构数值模型,并结合本文所提出的时变地震易损性模型,给出了三层平面RC框架0、5、10和15年龄期的易损性曲线和曲面。所提研究方法可用于既有RC框架结构生命周期内的抗震性能及损失预测分析。
[Abstract]:Based on the second law of one-dimensional Fick, the probabilistic prediction model of the initial moment of steel corrosion in Dura Crete code and the prediction model of steel bar diameter based on probability statistics are used to calculate the corrosion depth of steel bars in RC structures at different ages. Based on the theory of modified baroclinic field and taking corrosion depth as a single variable, the peak stress of corroded cracked concrete in different ages was calculated. The parameters in the constitutive model of reinforced bar and Mander confined concrete were modified according to the corrosion depth. The seismic vulnerability model of RC structure with time parameter is established by introducing time parameter into seismic vulnerability model. Finally, based on the degradation model of mechanical properties of the material mentioned above, a numerical model of three-story RC plane frame structure is established by using the fiber plastic hinge model based on force, and combined with the time-varying seismic vulnerability model proposed in this paper. In this paper, the vulnerability curves and surfaces of the three-layer plane RC frame with 0 / 5 / 10 and 15 age periods are given. The proposed method can be used to predict seismic performance and loss of existing RC frame structures during their life cycle.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家科技支撑计划(2013BAJ08B03) 国家自然科学基金(50978218,51108376) 教育部高等学校博士学科点专项科研基金(20136120110003) 陕西省科研项目(2012K12-03-01,2011KTCQ03-05,2013JC16)
【分类号】：TU311.3;TU375.4

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