超高性能混凝土中钢纤维锈蚀的细观力学分析  

Micromechanical Analysis of Steel Fiber Corrosion in Ultra-high Performance Concrete

作　　者：舒刚 张清华[2] 黄云[2] 卜一之[2] SHU Gang;ZHANG Qinghua;HUANG Yun;BU Yizhi(Sichuan Zhitong Luqiao Engineering and Technology Co.Ltd.,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]四川智通路桥工程技术有限责任公司,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2019年第6期1268-1276,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51578455,51378431,51178394);国家科技支撑计划(2011BAG07B03);中央高校基本科研业务费专项资金资助项目(2682014CX078);湖北省交通运输厅科技项目(2017-538-2-4)

摘　　要：为了研究钢纤维体积含量和锈蚀程度对结构强度和变形的影响,通过自行编写Python脚本文件,对ABAQUS软件进行二次开发,实现了钢纤维在超高性能混凝土(UHPC)基体中的大批量随机乱向均匀分布;在此基础上研究了UHPC带缺陷锈蚀模拟方法,进而探索了钢纤维锈蚀的等效方法;最后以UHPC梁四点抗弯试验为例,对UHPC细观力学分析方法、锈蚀的模拟方法和等效手段进行了验证.研究结果表明:当纤维体积含量为2%时,UHPC梁的抗弯曲性能最佳;影响锈蚀效应的关键因素为锈蚀造成纤维截面削弱、锈坑附近产生应力集中、界面粘结遭到破坏;采用随机材料属性分配的方式,仅局限于模拟UHPC梁的宏观变形,无法准确模拟应力场分布情况.In order to study the influence of the volume content and corrosion degree of the steel fiber on the strength and deformation of the structure, the large-volume randomization of the steel fiber in ultra-high performance concrete(UHPC) matrix was realized by the ABAQUS software redeveloped by self-compiling Python script file. Based on this, the UHPC defect corrosion simulation method was developed and the equivalent method of the steel fiber corrosion was explored. Finally, the UHPC beam four-point bending test was taked as an example to verify the UHPC micromechanics analysis method, corrosion simulation method, and equivalent means. The results show that when the fiber volume content is 2%, the UHPC beam has the best bending resistance;corrosion weakens the cross-section of fibers, stress concentration near the corrosion pits and the destroyed interfacial bonding are the key factors affecting the corrosion effect. The random material property distribution method is limited to simulate the macroscopic deformation of UHPC beams, and can’t accurately simulate the distribution of stress field.

关 键 词：超高性能混凝土(UHPC) 细观力学分析 钢纤维锈蚀模拟 ABAQUS二次开发 PYTHON算法 模型试验 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]