桥梁结构中E-GFRP单向板徐变性能与双尺度均匀化数值评估  

CREEP BEHAVIOR OF E-GFRP UNIDIRECTIONAL LAMINA FOR BRIDGE ENGINEERING USING TWO-SCALE NUMERICAL HOMOGENIZATION EVALUATION METHOD

作　　者：辛灏辉 高卿林 冯鹏[2] 刘玉擎[3] XIN Hao-hui;GAO Qing-lin;FENG Peng;LIU Yu-qing(Department of Civil Engineering,Xi’an Jiaotong University,Xi’an,Shaanxi 710049,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Department of Bridge Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]西安交通大学土木工程系,陕西西安710049 [2]清华大学土木工程系,北京100084 [3]同济大学桥梁工程系,上海200092

出　　处：《工程力学》2024年第8期93-106,共14页Engineering Mechanics

基　　金：国家自然科学基金项目(51808398,52078362);西安交通大学基本科研业务费项目(xzd012021029)。

摘　　要：由于玻璃纤维增强复合材料(GFRP)组分材料中的树脂属于高分子材料,桥梁工程界对GFRP结构的徐变性能十分担忧,阻碍了其推广应用。该文聚焦于桥梁工程E型玻璃纤维增强复合材料(E-GFRP)单向板,基于双尺度均匀化数值模拟方法,从纤维和树脂的徐变性能评估了E-GFRP单向板的徐变性能,并与试验结果进行比较验证了预测结果的准确性。在此基础上,分析了应力水平、纤维体积率及持荷形式对E-GFRP单层板徐变性能的影响,结果表明,应力水平越高、纤维体积率越小,单层板的徐变粘滞应变越大。在此基础上,提出了不同纤维体积率下E-GFRP单层板粘滞应变模型,准确表述了应力水平、持荷时间和徐变应变之间的关系。最后,提出了E-GFRP单层板徐变断裂时间预测公式,可为E-GFRP结构的长期性能预测提供参考。The creep performance of GFRP structures is concerned in the bridge engineering field because the resin in GFRP components belongs to the polymer material,which affects its promotion and application in the infrastructure engineering sector.This study focused on the E-GFRP lamina.The creep behavior of E-GFRP unidirectional lamina were predicted by using fiber and resin creep behavior through the two-scale numerical homogenization simulation method.The accuracy of the prediction was verified by comparing the experimental results with pertinent numerical simulation.The effects of stress level,the fiber volume fraction,and loading direction on the creep performance of E-GFRP lamina were analyzed.The results show that the higher the stress level or the smaller the fiber volume ratio is,the greater the creep strain of the lamina becomes.Then,a creep strain model of E-GFRP lamina with different fiber volume ratios was proposed to accurately describe the relationship between stress level and loading time and creep strain.Finally,the creep fracture time prediction equation of E-GFRP lamina was proposed,which may provide a reference for engineering design and long-term behavior prediction of E-GFRP structures.

关 键 词：E型玻璃纤维增强复合材料(E-GFRP) 双尺度数值模拟 徐变性能 粘滞应变模型 徐变断裂时间 

分 类 号：TU599[建筑科学—建筑技术科学] U444[建筑科学—桥梁与隧道工程]