(1 苏交科集团股份有限公司在役长大桥梁安全与健康国家重点实验室, 南京 211112;2 东南大学土木工程学院, 南京 211189; 3 河海大学土木工程学院, 南京 210024)

摘要: 为了验证高强螺栓止裂对平板贯穿型疲劳裂纹的加固效果,基于有限元模拟探究了高强螺栓止裂加固机理,通过单边裂纹钢板和横隔板足尺模型疲劳试验,验证了高强螺栓止裂加固的有效性,定量比较了高强螺栓规格对修复后钢板疲劳寿命的影响. 试验结果表明:单边裂纹钢板高强螺栓止裂加固后的疲劳寿命是传统止裂孔加固的近 5 倍,螺栓规格(螺栓直径、强度等级)对加固效果影响显著,单边裂纹钢板用 10. 9 级 M14 高强螺栓止裂的疲劳寿命是 8. 8 级 M12 高强螺栓的 3 倍以上. 横隔板足尺模型高强螺栓止裂加固后疲劳寿命达到 200 万次以上,满足规范疲劳强度等级要求. 单边裂纹钢板和横隔板足尺模型疲劳试验中,高强螺栓止裂后构件均表现出优异的抗疲劳性能.

关键词: 平板贯穿型疲劳裂纹; 高强螺栓; 止裂加固; 正交异性钢桥面板; 维修加固; 疲劳寿命

中图分类号:TU391,U441+.

 4 文献标志码:A 文章编号:1002-848X(2022)03-0104-06

DOI:10. 19701 / j. jzjg. LS210272

Experimental research on crack prevention and reinforcement with high-strength bolts forflat plate through cracks

WANG Xianqiang1,2, YANG Yi1, LIU Duo1, ZHANG Jiandong1, CHEN Chunlin3

(1 The State Key Laboratory on Safety and Health of In-service Long-span Bridges, JSTI Group, Nanjing 211112, China;2 School of Civil Engineering, Southeast University, Nanjing 211189, China;3 School of Civil Engineering, Hohai University, Nanjing 210024, China)

Abstract: In order to verify the reinforcement effect of high-strength bolts on flat plate through-type fatigue cracks, themechanism of crack prevention and reinforcement of high-strength bolts was explored based on finite element simulation.The effectiveness of crack prevention and reinforcement with high-strength bolts was verified through the fatigue tests ofsingle-side cracked steel plate and the diaphragm plate full-scale model. The influence of high-strength bolt size on thefatigue life of repaired steel plate was quantitatively compared. The test results show that the fatigue life of single-sidecracked steel plate after crack prevention and reinforcement with high-strength bolts is nearly 5 times as much as that oftraditional crack prevention hole reinforcement. Bolt specifications ( bolt diameter, strength grade ) have a significantimpact on the reinforcement effect. The fatigue life of single-side crack steel plate repaired by 10. 9 grade M14 highstrength bolt is more than 3 times of that repaired by 8. 8 grade M12 high-strength bolt. The fatigue life of transversediaphragm full-scale model after crack prevention and reinforcement with high-strength bolts reaches more than 2 milliontimes, which meets the requirements of fatigue strength level in the specification. In the fatigue test of the single-sidedcracked steel plate and diaphragm plate full-scale model, the components after the crack prevention with high-strength boltsall showed excellent fatigue resistance.

Keywords:flat plate through-type fatigue crack; high-strength bolt; crack prevention and reinforcement; orthotropic steelbridge deck; maintenance and reinforcement; fatigue life

∗中国博士后 基 金 面 上 项 目 ( 2018M642300) ,江 苏 省 博 士 后 科 研 资 助 计 划 项 目 ( 2018K136C) ,江 苏 省 交 通 运 输 科 技 项 目(2018Y11,2019Y69-02) .

第一作者:王贤强,博士,高级工程师,主要从事桥梁结构损伤诊断、状态评估与维修加固研究,Email: wangxianqiang1011@ 163. com.

[引用本文] 王贤强,杨羿,刘朵,等. 平板贯穿裂纹高强螺栓止裂加固试验研究[ J] . 建筑结构,2022,52( 3) :104-109. WANG Xianqiang,YANG Yi,LIU Duo, et al. Experimental research on crack prevention and reinforcement withhigh-strength bolts for flat plate through cracks[ J] . Building Structure,2022,52(3) :104-109.