摘要
半灌浆式套筒因采用了螺纹连接和粘结连接共同工作的方法,有效地减小了套筒长度并减少了灌浆用量。由有限元软件模型计算可知,在施加超过钢筋抗拉强度的外荷载作用后,钢筋会因局部应力过大而断裂,而套筒所受应力相对其屈服强度较小,仍可正常工作,所以半灌浆式套筒可保证连接强度达到并超过钢筋强度。通过对半灌浆式套筒进行单向拉伸试验、高应力反复拉压试验、大变形反复拉压试验,试验的结果表明半灌浆式套筒的强度和连接性能都符合相关标准的要求。
Semi-grouting coupler uses both threaded connection and bonding connection to effectively reduce the coupler length and grout consumption. Based on calculation by finite element software model, steel bar may break due to excessive local stress after applying external load larger than tensile strength of steel bar, while coupler could still work because its stress is smaller than its yielding strength, so semi-grouting coupler could ensure the connection strength reaches even exceeds the strength of steel reinforcement. After semi-grouting coupler went through one-way strengthing test, repeated high- stress tensioning and pressing test, repeated large-deformation tensioning and pressing test, it was found that strength and connection performance of semi-grouting coupler could meet the requirements of relevant standards.
出处
《建筑技术》
北大核心
2015年第10期937-940,共4页
Architecture Technology
关键词
半灌浆式套筒
连接技术
钢筋
连接性能试验
semi-grouting coupler
connection technique
steel reinforcement
connection performance test
