摘要
对7根不同加固方式和预加载程度的钢筋混凝土梁进行四点弯曲对称加载试验及相应数值模拟.结果表明:铝合金材料粘贴在梁表面可实现钢筋混凝土梁的抗剪加固,铝合金与混凝土之间的黏结应力最大为3.2 MPa.混凝土梁加固后,抗剪承载力增强25.83%~46.60%,挠度减小5.7%~30.1%,铝合金的强度利用率为54%~84%.侧面45°倾斜粘贴对实现混凝土梁的抗剪加固效果最佳,且适合结构物下方存在管线穿过的情况.随损伤程度增加,铝合金对混凝土梁的抗剪加固效果减弱且强度利用率下降.工程应用中,损伤的混凝土梁须及时采用铝合金片材加固.
The bonding performance between aluminum alloy and concrete were carried out on seven reinforced concrete beams by using the four-point bending test and finally verified by numerical simulation.The test results show that aluminum alloy can be well bonded to the surface of concrete beam for shear reinforcement.The bond stress between aluminum alloy and concrete can reach up to 3.2 MPa.The shear capacity of concrete beams can be increased by 25.83%~46.60%,the deflection can be improved by 5.7%~30.1%,and the strength utilization of aluminum alloy can reach 54%~84%.The 45°side slanting paste is optimistic for the shear reinforcement effect of the concrete beam,especially for the case where there is a large pipeline passing under the structure;as the damage degree increases,the shear reinforcement effect of the aluminum alloy is weaker.The strength utilization rate of aluminum alloys also began to decline.Therefore,in the actual reinforcement process,the aluminum alloy reinforced concrete beams need to be timely,so that the safety can be better protected.
作者
许颖
王青原
谢明
韦其颖
XU Ying;WANG Qingyuan;XIE Ming;WEI Qiying(Shenzhen Key Lab of Urban&Civil Engineering Disaster Prevention&Reduction,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,Guangdong China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第2期47-53,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金面上项目(51778191)
深圳市科技计划资助项目(JCYJ20170307145853300).
关键词
铝合金抗剪加固
抗剪承载力
有限元模拟
损伤程度
黏结-滑移本构模型
shear reinforcement of aluminum alloy
shear bearing capacity
finite element simulation
damage degree
bond-slip constitutive model
