摘要
为研究装配式混凝土结构中灌浆套筒在长期服役后内壁发生锈蚀对其力学性能的影响,制作了10个灌浆套筒连接试件,采用电化学方法对套筒内壁进行加速锈蚀,并对锈蚀试件开展拉拔试验。试验结果表明:当锈蚀率为0%和3%时,灌浆套筒连接试件的破坏形式表现为钢筋断裂破坏;当锈蚀率达到6%及以上时,灌浆套筒连接试件的破坏形式表现为灌浆料拔出,极限拉拔力和极限滑移量均随锈蚀率的增大而降低。与未发生锈蚀的套筒相比,当实测锈蚀率达到12.74%时,锈蚀导致灌浆套筒连接试件的极限拉拔力损失将近50%。针对套筒锈蚀后灌浆料被拔出的情况,提出了灌浆套筒内壁锈蚀的断裂黏结滑移模型,为内壁发生锈蚀的灌浆套筒连接试件的数值精细化建模提供参考。
In order to study the corrosion effect on the inner walls of the grouting sleeves on the mechanical properties of prefabricated concrete structures after long-term service, 10 specimens connected with grouting sleeves were fabricated. The electrochemical method was used to accelerate corrosion on the inner walls of sleeves, and pull-out tests were conducted on specimens. The test results showed that when the corrosion rate was 0% and 3%, the failure modes of the specimens connected with the grouting sleeve were all shown as steel fracture failure. When the corrosion rate reached 6% and above, the failure mode of specimens in connection with grouting sleeves was the pull-out of grouting material, and the ultimate pull-out force and ultimate slip amount decreased with the increase of corrosion rate. Compared with the non-corroded sleeve, when the measured corrosion rate reached 12.74%, the loss of the ultimate pull-out resistance for grouting sleeves connected specimen by rust was by nearly 50%. Aiming at the case that the grouting material was pulled out after the sleeve was corroded, a fracture bond-slip model for the corrosion on the inner wall of the grout sleeve was proposed. It provided theoretical reference to the numerically refined modeling of grouting sleeves connected specimens with corroded inner walls.
作者
杜永峰
张天允
李虎
DU Yongfeng;ZHANG Tianyun;LI Hu(Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China;International Research Base on Seismic Mitigation and Isolation of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《工业建筑》
CSCD
北大核心
2021年第11期75-80,共6页
Industrial Construction
基金
国家自然科学基金项目(51778276)
甘肃省重点研发计划基金项目(18YF1FA067)。
关键词
灌浆套筒
灌浆料
锈蚀
黏结滑移
本构关系
grouting sleeve
grouting material
corrosion
bond-slip
constitutive relation
