- 摘 要
-
(1 蘇交科集團股份有限公司在役長大橋梁安全與健康國家重點實驗室, 南京 211112;2 東南大學土木工程學院, 南京 211189; 3 河海大學土木工程學院, 南京 210024)
摘要: 為了驗證高強螺栓止裂對平板貫穿型疲勞裂紋的加固效果,基于有限元模擬探究了高強螺栓止裂加固機理,通過單邊裂紋鋼板和橫隔板足尺模型疲勞試驗,驗證了高強螺栓止裂加固的有效性,定量比較了高強螺栓規(guī)格對修復后鋼板疲勞壽命的影響. 試驗結果表明:單邊裂紋鋼板高強螺栓止裂加固后的疲勞壽命是傳統(tǒng)止裂孔加固的近 5 倍,螺栓規(guī)格(螺栓直徑、強度等級)對加固效果影響顯著,單邊裂紋鋼板用 10. 9 級 M14 高強螺栓止裂的疲勞壽命是 8. 8 級 M12 高強螺栓的 3 倍以上. 橫隔板足尺模型高強螺栓止裂加固后疲勞壽命達到 200 萬次以上,滿足規(guī)范疲勞強度等級要求. 單邊裂紋鋼板和橫隔板足尺模型疲勞試驗中,高強螺栓止裂后構件均表現(xiàn)出優(yōu)異的抗疲勞性能.
關鍵詞: 平板貫穿型疲勞裂紋; 高強螺栓; 止裂加固; 正交異性鋼橋面板; 維修加固; 疲勞壽命
中圖分類號:TU391,U441+.
4 文獻標志碼:A 文章編號: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
∗中國博士后 基 金 面 上 項 目 ( 2018M642300) ,江 蘇 省 博 士 后 科 研 資 助 計 劃 項 目 ( 2018K136C) ,江 蘇 省 交 通 運 輸 科 技 項 目(2018Y11,2019Y69-02) .
第一作者:王賢強,博士,高級工程師,主要從事橋梁結構損傷診斷、狀態(tài)評估與維修加固研究,Email: wangxianqiang1011@ 163. com.
[引用本文] 王賢強,楊羿,劉朵,等. 平板貫穿裂紋高強螺栓止裂加固試驗研究[ J] . 建筑結構,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.
