考虑损伤效应的弯曲破坏型腐蚀RC柱恢复力模型  

Restoring force model of corroded RC columns with bending failure considering damage effects

作　　者：尚志刚 郑山锁[1,2] 郑淏 姜叶子 董晋琦 SHANG Zhi‑gang;ZHENG Shan‑suo;ZHENG Hao;JIANG Ye‑zi;DONG Jin‑qi(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China;School of Combat Support,Rocket Force University of Engineering,Xi’an 710025,China;China Qiyuan Engineering Corporation,Xi’an 710018,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]火箭军工程大学作战保障学院,陕西西安710025 [4]中国启源工程设计研究院有限公司,陕西西安710018

出　　处：《振动工程学报》2023年第2期369-378,共10页Journal of Vibration Engineering

基　　金：国家重点研发计划资助项目(2019YFC1509302);陕西省重点研发计划资助项目(2021ZDLSF06-10);西安市科技计划资助项目(2019113813CXSF016SF026)。

摘　　要：出于氯盐腐蚀钢筋混凝土(reinforced concrete,RC)结构弹塑性分析的需要,对6根RC框架柱试件进行加速腐蚀试验,而后进行拟静力试验,观察人工气候环境下锈蚀钢筋的表观损伤,并分析不同腐蚀程度和轴压比对RC框架柱破坏形态和抗震性能的影响。在此基础上,引入双参数损伤模型,确定模型参数取值,进而定量化揭示腐蚀RC框架柱损伤发展规律。此外,通过理论分析与试验回归相结合的方法,建立考虑腐蚀与轴压比影响的RC框架柱骨架曲线模型。引入基于损伤的循环退化指数,提出能够反映加载、卸载、再加载、下降四阶段性能退化的滞回规则,进而建立弯曲破坏型腐蚀RC框架柱恢复力模型,并验证其有效性。结果表明,骨架曲线计算值与试验值误差总体在10%以内,累积耗能计算值与试验值误差总体不超过20%;由于计算再加载曲线线性特征,再加载阶段与试验结果存在一定误差,但滞回曲线整体上吻合较好、误差较小,说明建立的恢复力模型能够较为准确地反映弯曲破坏型腐蚀RC框架柱抗震性能。To meet the needs of elastic-plastic analysis of reinforced concrete(RC)structures induced by chloride erosion,an accel⁃erated corrosion test is conduct on six RC frame column specimens.Then,quasi-static tests are carried out.The apparent damage of corroded steel bars is observed under artificial climate environment.The influence of corrosion level and axial compression ratio on failure pattern and seismic behavior of the specimens is analyzed.Based on the test results,a double parameter damage model is used,and the value of the model parameters is defined.Then,the damage development law of corroded RC frame columns is quan⁃titatively disclosed.Furthermore,a skeleton curve model of the RC frame columns is established by combining theoretical analysis with experimental regression.The model considered the influence of corrosion and axial compression ratio.The cyclic degradation index based on damage is introduced.The hysteresis rules reflecting the performance degradation in four stages of loading,unload⁃ing,reloading and declining are proposed.Then a restoring force model of corroded RC frame columns with bending failure is es⁃tablished and the accuracy is verified.The error of the calculated skeleton curve and the test skeleton curve is less than 10%,and the error of the calculated and test energy dissipation is within 20%.Since the linear characteristic of the calculated reloading curve,there is an obvious error of the reloading stage.However,the calculated hysteretic curves are in good agreement and have small errors on the whole with the experimental results,indicating that the established restoring force model can accurately reflect the seismic behavior of corroded RC frame column with bending failure.

关 键 词：钢筋混凝土框架柱 抗震性能 损伤模型 氯盐腐蚀 恢复力模型 

分 类 号：TU375.3[建筑科学—结构工程] TU317.1