干湿循环腐蚀环境下混凝土墩柱的抗侧向冲击性能  

Lateral anti-impact performance of reinforced concrete pier under drying-wetting cycles and chloride-ion corrosion environment

作　　者：方从启[1] 杨帅[1] 薛文韬[1] 雷超[1] 

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《混凝土》2017年第6期67-71,79,共6页Concrete

基　　金：国家自然科学基金项目(51178264);铁道部科技研究开发计划项目(J2011G003)

摘　　要：为了研究受损混凝土墩柱在冲击作用下的动力响应及破坏形式,基于受损墩柱抗侧向冲击破坏试验进行了其抗冲击性能的数值模拟分析。通过修改关键字文件(.key文件)继承上一次冲击的损伤,实现对受腐蚀钢筋混凝土墩柱的连续多次冲击的模拟。分析表明:在几何模型上预设了顺筋初始锈胀裂纹,该几何模型能够较好反映混凝土墩柱由于氯离子腐蚀和干湿循环腐蚀造成的初始环境损伤;HJC本构模型、脆性损伤本构模型、盖帽本构模型和混凝土损伤本构模型等4种常用混凝土动态本构模型的数值模拟结果与试验结果基本吻合。In order to research the failure form and impact response of damaged concrete pier under impact, the numerical simulation analysis based on lateral impact was carried out on the anti-impact performance of damaged pier.Simulation of corroded reinforced con- crete pier under continuous impact was achieved by modifying the keyword file （ .key file ）.Results show that the longitudinal initial cor- rosion expansion cracks were preset in geometric model, the geometric model can better reflect the initial environmental damage caused by chlorine ion corrosion and drying-wetting cycles corrosion.The numerical simulation that use four common concrete dynamic damage con- stitutive models contain HJC constitutive model, the brittle damage the constitutive model,blocks constitutive model and concrete constitu- tive model results are basically consistent with experimental results.

关 键 词：受损墩柱 冲击 数值模拟 

分 类 号：TU528.01[建筑科学—建筑技术科学]