含表面裂纹受弯钢板表贴增强板材疲劳试验研究  

Experimental Research on Fatigue Performance of Bent Steel Plates with Surface Cracks Using Externally Bonded Reinforcing Plates

作　　者：邓扬 王彤 李本新 杜同鑫 曹宝雅 DENG Yang;WANG Tong;LI Benxin;DU Tongxin;CAO Baoya(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Infrastructure Property Management Center of the National Development and Reform Commission,Beijing 100045,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]国家发展和改革委员会基建物业管理中心,北京100045

出　　处：《工业建筑》2024年第6期91-99,共9页Industrial Construction

基　　金：国家自然科学基金项目(51878027,52108108);北京建筑大学金字塔人才工程培养计划项目(JDYC20220809);北京建筑大学基本科研业务费项(X24024)。

摘　　要：为探究不同补强材料对含表面裂纹受弯钢板的疲劳加固性能,分别采用碳纤维增强复合材料(CFRP)板和钢板加固方案,对含表面裂纹的Q345钢板进行疲劳加载试验。分析了初始裂纹尺寸、加固板厚度及粘贴方式对钢板加固性能的影响,试验过程中采用超声波探伤仪对裂纹扩展的深度和长度进行了测试,最后采用扩展有限元法(XFEM)对钢板裂纹的扩展过程进行了模拟分析。结果表明:在含表面裂纹受弯钢板上粘贴CFRP板和钢板均能有效延长损伤钢板的疲劳寿命,抑制裂纹扩展;粘贴双层加固板时试件发生脱胶破坏,影响加固效果,故建议采用单层粘贴加固的方式;CFRP板的疲劳加固效果优于钢板,增加加固板的厚度可进一步提升加固效果,对含较大初始裂纹的受损钢板加固效果要明显优于含较小初始裂纹的;XFEM模拟裂纹扩展所得疲劳寿命与疲劳裂纹长度均与试验吻合。To explore the fatigue performance of surface-cracked bent steel plates with different reinforcing materials,fatigue loading tests were conducted on Q345 steel plates with surface cracks using Carbon Fiber Reinforced Polymer(CFRP)plates and steel plates as reinforcement schemes.The effects of initial crack size,reinforcing plate thickness,and bonding methods on the reinforcement performance were analyzed.During the tests,the depth and length of crack propagation were measured using an ultrasonic flaw detector,and the crack propagation process in the steel plates was simulated by using the Extended Finite Element Method(XFEM).The results showed that both CFRP plates and steel plates could effectively extend the fatigue life of the damaged steel plates and suppress crack propagation.When double-layered reinforcing plates were used,delamination failure occurred,affecting the reinforcement effect.Therefore,it was recommended to use a single-layer bonding method for reinforcement.The reinforcement effect of CFRP plates was superior to that of steel plates,and increasing the thickness of the reinforcing plates further enhanced the reinforcement effect.Reinforcement was significantly more effective on damaged steel plates with larger initial cracks compared to those with smaller initial cracks.The fatigue life and crack length obtained from XFEM simulation of crack propagation were consistent with the experimental results.

关 键 词：表面裂纹 钢板加固 CFRP板加固 疲劳加载 疲劳寿命 裂纹扩展 

分 类 号：TU392.4[建筑科学—结构工程]