The stud connectors of steel-concrete composite bridges in corrosive environments may deteriorate due to corrosion-fatigue coupling effect. Three groups of 10 stud push-out specimens were designed and fabricated, and the static and fatigue performance tests and corrosion-fatigue coupling tests were carried out respectively to study the corrosion-fatigue failure and mechanical property degradation mechanism of stud. The results show that corrosion significantly degrades the shear stiffness of the stud; the fatigue life of stud under corrosion-fatigue coupling effect is significantly lower than that after corrosion; the fatigue crack of the stud originates from the stud rod section near the weld toe section on the shear action side, and mainly propagates as a shear crack. When the fatigue crack or corrosion-fatigue crack develops to about 1/2 of the stud diameter, the stud fractures under the combined tensile-shear stress; the main factors affecting stud's damage evolution rate are load ratio, corrosion rate, and corrosion-fatigue coupling effect; the degradation rate of shear stiffness of the stud under the corrosion-fatigue coupling effect is greater than that of the fatigue alone, and the degradation of the shear stiffness includes two stages: rapid degradation and slow degradation, and the former stage accounts for about 20% of the corrosion fatigue life of the stud.
LIYongcan. Study on the Shear Resistance of Ceramsite Concrete Composite Shear Connector after Chlorine Ion Corroded [D]. Wuhan: Wuhan University of Science and Technology, 2021. in Chinese
[3]
石卫华.考虑耐久性的钢-混凝土组合梁结构力学性能研究及可靠性分析[D].长沙:中南大学,2013.
[4]
SHIWeihua. Mechanical Behavior and Reliability of Steel-Concrete Composite Beams Considering Durability [D]. Changsha: Central South University, 2013. in Chinese
WANGLiqiang, WANGYuanzhuan, CAIJingtao. A Combined Model for Calculating Chloride Ion Concentration in Concrete under Marine Environment [J]. Port and Waterway Engineering, 2009 (12): 32-35. in Chinese
[7]
陈丽芝.干湿循环作用下氯离子对钢-混凝土组合梁的侵蚀及损伤演变[D].长沙:中南大学,2011.
[8]
CHENLizhi. Erosion and Damage Evolution of Steel-Concrete Composite Beams Induced by Chloride Ions under Dry-Wet Cycling [D]. Changsha: Central South University, 2011. in Chinese
[9]
吴建高.复合溶液干湿循环作用下钢-混凝土组合梁的耐久性研究[D].长沙:中南大学, 2011.
[10]
WUJiangao. Study on Durability of Steel-Concrete Composite Beams under Dry-Wet Circulation of Composite Solution [D]. Changsha: Central South University, 2011. in Chinese
[11]
XUEW, CHENJ, XUF, et al. Corrosion Development of Carbon Steel Grids and Shear Connectors in Cracked Composite Beams Exposed to Wet-Dry Cycles in Chloride Environment [J]. Materials, 2018, 11 (4): 479.
YUZhiwu, KUANGYachuan, GONGKuanghui, et al. Structrual Behavior of Steel-Concrete Composite Beam with Accelerated Deterioration Using a Galvanstatic Method [J]. Journal of Railway Science and Engineering, 2010, 7 (3): 1-5. in Chinese
[14]
YUL, FRANÇOISR, GAGNÉR. Influence of Steel-Concrete Interface Defects Induced by Top-Casting on Development of Chloride-Induced Corrosion in RC Beams under Sustained Loading [J]. Materials and Structures, 2016, 49 (12): 5169-5181.
[15]
陈堤.锈蚀栓钉连接件静力性能研究[D].湘潭:湖南科技大学,2018.
[16]
CHENDi. Study on Static Properties of Corroded Stud Connectors [D]. Xiangtan: Hunan University of Science and Technology, 2018. in Chinese
XUEWen, CHENJu, WULin, et al. Experimental Investigation of Composite Steel-Concrete Beams with Corroded Studs [J]. Journal of Building Structures, 2013, 34 (): 222-226. in Chinese
WANGLibin, QIUJie, HUANGLiu, et al. A Calculation Method of the Ultimate Bearing Capacity of Steel-Concrete Composite Beam under the Condition of Stud Corrosion [J]. Journal of Hunan City University: Natural Science, 2021, 30 (3): 17-20. in Chinese
[21]
金大帅.考虑结构性能退化的钢-混组合梁桥疲劳性能研究[D].合肥:合肥工业大学,2021.
[22]
JINDashuai. Fatigue Study of Steel-Concrete Composite Girder Bridges Considering the Performance Degradation [D]. Hefei: Hefei University of Technology, 2021. in Chinese
[23]
彭鹏.腐蚀与荷载共同作用下钢-混凝土组合梁长期性能研究[D].湘潭:湘潭大学,2020.
[24]
PENGPeng. Long-Term Mechanical Properties of Steel-Concrete Composite Beam Subjected to Corrosion and Loading [D]. Xiangtan: Xiangtan University, 2020. in Chinese
ZHANGHaipeng, CHENJu, JINWeiliang, et al. Fatigue Behavior of Steel-Concrete Composite Beams with Corroded Stud [J]. Journal of Building Structures, 2019, 40 (5): 89-95. in Chinese
RONGXueliang, HuangQiao. Experimental Study on Mechanical Properties of Corroded Stud Shear Connectors [J]. Journal of Civil and Environmental Engineering, 2012, 34 (2): 15-20. in Chinese
[29]
CHENJ, ZHANGH, YUQ Q. Monotonic and Fatigue Behavior of Steel-Concrete Composite Beams Subjected to Corrosion [C]// Structures. Elsevier, 2021, 34: 1973-1984.
[30]
CHENJ, ZHANGH, YUQ Q. Static and Fatigue Behavior of Steel-Concrete Composite Beams with Corroded Studs [J]. Journal of Constructional Steel Research, 2019, 156: 18-27.
[31]
侯崛.腐蚀钢-混凝土组合梁疲劳性能研究[D].湘潭:湖南科技大学,2019.
[32]
HOUJue. Study on Fatigue Properties of Corroded Steel-Concrete Composite Beams [D]. Xiangtan: Hunan University of Science and Technology, 2019. in Chinese
Ministry of Transport of the People's Republic of China. JST/T 236—2019 Technical Specification for Concrete Testing of Port and Waterway Engineering [S]. Beijing: China Communication Press, 2019. in Chinese )
[35]
XUX, HED, ZENGS, et al. Effect of Concrete Cracks on the Corrosion of Headed Studs in Steel and Concrete Composite Structures [J]. Construction and Building Materials, 2021, 293: 123440.
LINZhaofei, LIUYuqing, HEJun. Research on Calculation Method of Shear Stiffness for Headed Stud Connectors [J]. Engineering Mechanics, 2014, 31 (7): 85-90. in Chinese
XIAOLin, LIXiaozhen, WEIXing, et al. Experimental Study on the Fatigue Behavior of PBL Shear Connectors [J]. Journal of Civil Engineering, 2015, 48 (7): 93-101. in Chinese
[40]
HANSWILLEG, PORSCHM, USTUNDAGC. Resistance of Headed Studs Subjected to Fatigue Loading: Part I: Experimental Study [J]. Journal of Constructional Steel Research, 2007, 63 (4): 475-484.
[41]
HALLAMM W. The Behaviour of Stud Shear Connectors under Repeated Loading [R]. Sydney: The Uneversity of Sydney, 1976: 54-55.