循环弯曲荷载作用下钢筋混凝土梁碳化深度预测  

Prediction of Carbonation Depth of Reinforced Concrete Beams Under Cyclic Flexural Loads

作　　者：朱林楦 张铭驿 陈超然 周志军[1] 王苗苗[1] ZHU Linxuan;ZHANG Mingyi;CHEN Chaoran;ZHOU Zhijun;WANG Miaomiao(School of Highway,Chang’an University,Xi’an 710064,China;Yunnan Science Research Institute of Communication Co.,Ltd.,Kunming 650011,China;Gansu Province Transport Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]长安大学公路学院,西安710064 [2]云南省交通科学研究院有限公司,昆明650011 [3]甘肃省交通规划勘察设计院股份有限公司,兰州730030

出　　处：《工业建筑》2022年第11期139-143,212,共6页Industrial Construction

基　　金：陕西省交通运输厅科研项目(20-13K)。

摘　　要：为研究循环弯曲荷载与碳化耦合作用下混凝土的劣化规律,开展了循环弯曲荷载作用下的钢筋混凝土梁的快速碳化试验,同时结合试验数据及理论分析,提出了循环弯曲荷载作用下的混凝土碳化深度预测模型,定量分析了应力水平及循环次数对混凝土碳化深度的影响,最后通过现有试验结果对模型进行验证。结果表明:碳化时间越长,混凝土碳化深度越大,但碳化速率逐渐减慢;应力水平越高,循环加载次数越多,混凝土疲劳损伤越严重,且疲劳损伤会加速混凝土的碳化;碳化模型的预测值与试验值吻合较好,相对误差小于5%,该模型可用于预测反复荷载作用下混凝土的碳化深度。In order to study deterioration laws of concrete under combined action of cyclic flexural loads and carbonation, the accelerated carbonation test for RC beams under cyclic flexural loads was conducted. Simultaneously, based on theoretical analysis and experiment results, a prediction model for carbonation depth was proposed, which could quantitatively analyze the influence of stress levels and loading cycles on carbonation depths of concrete. Finally, the model was verified by existing test results. The results showed that carbonation depths of concrete increased with increase of carbonation time, but the carbonation rate slowed down gradually;the higher the stress level and the more loading cycles, the more serious the fatigue damage of concrete, which would accelerate carbonation of concrete;the predicted values by the carbonation depth model were in good agreement with the experimental results, and the relative errors were less than 5%. The model could be used to predict the carbonation depth of concrete under repeated loading.

关 键 词：混凝土 循环弯曲荷载 疲劳损伤 碳化模型 

分 类 号：TU375.1[建筑科学—结构工程]