残余应力对碳纤维增强压弯H型钢弹塑性稳定性的影响研究  

INFLUENCE OF THE RESIDUAL STRESS ON THE ELASTIC-PLASTIC STABILITY OF H-SHAPED STEEL MEMBERS WRAPPED BY CFRP UNEDER AXIAL COMPRESSIVE LOAD AND BENDING MOMENT

作　　者：钮鹏[1,2] 丁静姝 金春福[3] 杨刚[4] 郭强 NIU Peng;DING Jing-shu;JIN Chun-fu;YANG Gang;GUO Qiang(Institute of Architectural Engineering, Shenyang University, Shenyang, Liaoning 110044, China;Key Laboratory of Geoenvironmental Engineering of Liaoning Province, Shenyang University, Shenyang, Liaoning 110044, China;Highway Engineering Quality Inspection Center of Liaoning Provincial Communications College, Shenyang, Liaoning 110122, China;Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian, Liaoning 116026, China)

机构地区：[1]沈阳大学建筑工程学院,辽宁沈阳110044 [2]沈阳大学辽宁省环境岩土工程重点实验室,辽宁沈阳110044 [3]辽宁省交通高等专科学校公路工程质量检测中心,辽宁沈阳110122 [4]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《工程力学》2019年第B06期31-36,共6页Engineering Mechanics

基　　金：辽宁省高等学校优秀人才支持计划项目(LJQ2015076);辽宁省自然科学基金指导计划项目(20180550502,20180550332)

摘　　要：建立轴压和弯矩共同作用下碳纤维增强H形截面构件绕强轴失稳时极限荷载的计算公式。通过弹塑性有限元法并结合非线性屈曲理论,进行了压弯荷载共同作用时碳纤维增强钢构件和考虑残余应力影响下钢构件的屈曲分析。当给定弯矩仅在某一范围内时,考虑残余应力的CFRP增强钢构件的极限承载力相比CFRP增强完善条件下的钢构件极限承载力相比要低很多。当给定弯矩超出此范围时,前者要略高于后者。受残余应力影响的碳纤维增强压弯构件极限承载力始终比未增强完善钢构件的限承载力高,表明构件可以通过碳纤维增强来弥补残余应力所导致的构件承载力损失,充分体现了碳纤维良好的增强效果。The analytical expressions of the ultimate buckling load about the neutral axis of the maximum moment of inertia for an H-shaped member wrapped by carbon fiber are derived.Using the elastic-plastic finite element method and the theory of nonlinear buckling,the impact of residual stress and non-residual stress in an H-shaped steel member wrapped by carbon fiber reinforced polymer(CFRP)under axial compressive load and bending moment is analyzed.When the given bending moment is within a certain range,the ultimate strength of CFRP reinforced steel members considering residual stress is much lower than that of CFRP reinforced steel members.However,when the given bending moment exceeds this range,the former is slightly higher than the latter.The ultimate strength of a CFRP reinforced compression-bending member affected by residual stress is always higher than that of steel members that is not reinforced and perfected.It also shows that CFRP wrapping can reduce the loss of strength caused by residual stress,which fully demonstrates the good strengthening effect of carbon fiber.

关 键 词：结构工程 碳纤维 弹塑性稳定 残余应力 Jezek法 

分 类 号：O344.7[理学—固体力学] TU391[理学—力学]