摘要
为控制粘贴钢板加固钢筋混凝土(RC)梁的裂缝宽度,对梁加固前、后受弯裂缝产生的机理进行了分析,并通过6根粘贴钢板加固RC简支梁加载的全过程试验,观察裂缝的扩展规律.在RC梁裂缝宽度现有计算方法的基础上,给出了分阶段计算RC梁受弯裂缝宽度的方法和表达式,并对不同受力阶段裂缝宽度的理论计算值与试验结果进行了比较.研究表明:RC梁在开裂状态下粘贴钢板加固后,由于加固前后截面几何性质和受力状态改变,在荷载作用下原有裂缝首先扩展;最大裂缝宽度应按加固前和加固后分别计算,然后迭加,才符合梁的实际受力情况;最大裂缝宽度发生在原钢筋重心附近梁侧面原有裂缝处,而非新裂缝处.
In order to control the bending crack width of reinforced concrete（RC） beams strengthened by bonding steel plate,the crack generation mechanism before and after reinforcement was analyzed.The developing behavior of cracks was investigated through the whole loading process of six simply-supported RC beams strengthened with steel plate.Based on the existing calculation methods for crack width of RC beams,a two-stage calculation method of crack width was proposed.Moreover,the theoretical calculating values were compared with the measured values of crack width of the test beams in different loading stages.The results show that after a RC beam with cracks is strengthened by bonding steel plate,the original cracks develop firstly because of the changes of its cross-section geometric properties and load condition due to reinforcement.The calculation of the maximum crack width under bending loading should be divided into two parts,and then the two separate calculation results are superimposed to accord with the actual loading state.The control position of the maximum crack width is at the original crack nearby the center of gravity of steel bars,while not at a new crack.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2010年第4期508-513,共6页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(50808085)
关键词
结构工程
受弯构件
粘贴钢板加固
裂缝宽度
计算方法
structural engineering
flexural member
strengthening by bonding steel plate
crack width
computational method
