- 摘 要
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(1 蘇交科集團(tuán)股份有限公司 在役長大橋梁安全與健康國家重點(diǎn)實(shí)驗(yàn)室， 南京 211112；2 東南大學(xué)土木工程學(xué)院， 南京 211189； 3 河海大學(xué)土木工程學(xué)院， 南京 210024)
［摘要］橫隔板疲勞裂紋是正交異性鋼橋面板的主要疲勞失效模式，為提高傳統(tǒng)止裂孔處的疲勞壽命，提出了將止裂孔作為預(yù)處理措施與高強(qiáng)螺栓、粘貼碳纖維增強(qiáng)復(fù)合材料（CFRP）、粘貼鋼板相結(jié)合的復(fù)合加固方法。為了研究止裂孔復(fù)合加固方法的修復(fù)效果，以含單邊初始裂紋的鋼板為研究對象，對止裂孔加固和復(fù)合加固鋼板進(jìn)行了疲勞測試，對比分析了復(fù)合加固方法的失效模式、裂紋擴(kuò)展規(guī)律和疲勞性能，并基于有限元分析揭示了栓接止裂孔復(fù)合加固機(jī)理。試驗(yàn)結(jié)果表明，粘貼CFRP和粘貼鋼板由結(jié)構(gòu)樹脂膠剝離引起失效，栓接止裂孔失效以墊片疲勞破壞為主；復(fù)合加固有效延緩了疲勞裂紋擴(kuò)展速率，疲勞壽命達(dá)到止裂孔加固的3.6~15.8倍，粘貼鋼板和栓接止裂孔的加固效果優(yōu)于粘貼CFRP的加固效果。綜合對比來看，栓接止裂孔加固墊片先于母材破壞起到失效預(yù)警作用，并可更換高強(qiáng)螺栓周期性提高疲勞性能，是理想的“微損傷”加固方法。
［關(guān)鍵詞］橫隔板；疲勞裂紋；止裂孔；復(fù)合加固；栓接止裂孔；疲勞壽命
中圖分類號：U441+.4 文獻(xiàn)標(biāo)識(shí)碼：A文章編號：1002-848X(2021)21-0100-06
Study on fatigue performance of single-edge cracked steel plates strengthened by combination methods using stop holes
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: Fatigue crack in diaphragm plate is the main fatigue failure mode of orthotropic steel bridge deck. In order to improve the fatigue life of traditional stop-hole treatment method, a composite reinforcement method was proposed combining high strength bolt, carbon fiber reinforced polymer (CFRP) and steel plate with stop-hole as a pretreatment measure. In order to study the effectiveness of the composite reinforcement method using stop holes, the fatigue test was carried out on the steel plate with single side initial crack, and the failure mode, crack propagation law and fatigue performance of steel plate strengthened by composite reinforcement methods were compared. Based on the Finite Element Analysis (FEA), the internal mechanism of composite reinforcement by using stop holes and high-strength bolts was revealed. Test results show that the failure of bonded CFRP and steel plate is caused by the stripping of resin adhesive, and the failure of bolted stop hole is mainly caused by the fatigue failure of gasket. Composite reinforcement can effectively delay the fatigue crack growth rate, and the fatigue life can reach 3.6~15.8 times of that reinforced by the stop hole. The reinforcement effect of the bonded steel plate and the bolted stop hole is better than that of the bonded CFRP. In a comprehensive comparison, the gasket plays a failure warning role before the parent material failure, and high-strength bolt can be replaced to periodically improve fatigue performance. Therefore, the method of stop hole improved by high-strength bolt is an ideal “micro damage” reinforcement method.
Keywords:diaphragm plate； fatigue crack； stop hole； composite reinforcement； bolted stop hole； fatigue life
*中國博士后基金面上項(xiàng)目（2018M642300），江蘇省博士后科研資助計(jì)劃項(xiàng)目（2018K136C），江蘇省交通運(yùn)輸科技項(xiàng)目（2018Y11，2019Y69-02）。
作者簡介：王賢強(qiáng)，博士，高級工程師，Email: wangxianqiang1011@163.com； 通信作者：張建東，博士，研究員級工程師，博士生導(dǎo)師，Email：1165334241@qq.com。
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