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| Experimental Research on the Bearing Capacity of Steel and Concrete Joint Section in Hybrid Tower |
| WANG Xue-feng, GUAN Da-yong, FENG Yu-long |
| China Highway Engineering Consultants Corporation, Beijing 100089, China |
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Abstract To investigate the bearing capacity and force mechanism of steel and concrete joint section in hybrid tower,on the basis of analyzing the stress of front bearing plate, rear bearing plate and plug-in joint section, finite element models concerning with back bearing plate based on a specified pylon joint section of Yuejiang bridge in Zhaoqing City were conducted to study mechanical behaviors of the joint section.According to the calculation results of the model, the shear force of shear studs in the back bearing plate joint section increases gradually from top to bottom. The farther away from the bearing plate, the greater the shear force borne by the shear studs, and the peak value was reached at the bottom of the joint section. The axial force transmitted by the bearing plate accounts for 68% of the total axial force, and the other axial forces are transmitted through shear nails, which has a good force transmission effect. An experimental specimen with back bearing plate, with a reduced scale at 1:4 of the single limb of a tower was conducted, and structural deformation and stress distribution were measured here. The results show that the existence of a bearing plate and its position in connection will lead to a totally different shear force distribution of the shear connectors. The joint section with back bearing plate has an excellent bearing capacity and can transfer force fluently from steel tower to concrete tower. The tested specimen basically kept a linear behavior in the whole loading process. The steel plates in the connection hold a gradually decreasing stress distribution downward, while the distribution of concrete is opposite. The maximum relative deformation between steel and concrete was about 0.1mm in this test. The hybrid connection with back bearing plate has a good application in engineering hopefully. In view of the test results that the stress level of the concrete under the bearing plate was slightly higher, the C60 concrete with steel fiber in the steel-concrete joint section was used to improve the compressive capacity of the structure. At the same time, in order to improve the stress concentration phenomenon of concrete at the corner of bearing plate and wall plate in steel-concrete joint section, trial mixing test and grouting were used to ensure the compactness between steel and concrete, and good use effect was achieved.
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Received: 10 September 2021
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[1] LIU Yu-qing. Development of Design Technique for Joint Parts of Hybrid Girder[J]. World Bridges, 2005, 4:9-12. (in Chinese)
[2] ZHANG Yong. Research on the Structural Characteristics of Steel-concrete Composite Segment in Pylon of Nanjing Yangzi River 3rd Bridge[D]. Chengdu:Southwest Jiaotong University, 2005. (in Chinese)
[3] CUI Bing, ZHAO Can-hui, DONG Meng, et al. Design of Main Pylon Steel-concrete Joint Section in Nanjing No. 3 Yangtze River Bridge Project[J]. Highway, 2009(5):100-107. (in Chinese)
[4] ZHANG De-ming. Design of Towers of Main Bridge of Fenghuang Yellow River Bridge in Jinan[J]. Bridge Construction, 2020, 50(5):84-89. (in Chinese)
[5] LIU R, LIU Y Q. Analysis of Auxiliary Ribs in Steel-concrete Joint of Hybrid Girder[J]. Journal of Constructional Steel Research, 2015, 112(9):363-372.
[6] CHEN Kai-li, WANG Jie-zao, AN Qun-hui. Model Tests on Steel-concrete Joining Section of Main Girder of a Cable-stayed Bridge[J]. China Civil Engineering Journal, 2006, 39(3):86-90. (in Chinese)
[7] HE J, LIU Y Q, PEI B Z. Experimental Study of the Steel-concrete Connection in Hybrid Cable-stayed Bridges[J]. Journal of Performance of Constructed Facilities, 2014, 28(3):559-570.
[8] XIN H H, LIU Y Q, HE J, et al. Experimental and Analytical Study on Stiffened Steel Segment of Hybrid Structure[J]. Journal of Constructional Steel Research, 2014, 100(9):237-258.
[9] ZHANG S. A Review and Study on Ultimate Strength of Steel Plates and Stiffened Panels in Axial Compression[J]. Ships & Offshore Structures, 2015, 11(1/2):81-91.
[10] XIAO Lin, YE Hua-wen, WEI Xing, et al. Study on Mechanical Behavior and Load Transfer Mechanism of Steel-concrete Composite Joint of Cable-stayed Bridge Pylon[J]. China Civil Engineering Journal, 2014, 47(3):88-96. (in Chinese)
[11] WEI Xing, QIANG Shi-zhong. Specimen Test For Mechanics Behavior of Steel-concrete Composite Joint in Pylon of Cable-stayed Bridge[J]. Engineering Mechanics, 2013, 30(1):255-260, 313. (in Chinese)
[12] ZHANG Guang-hui, ZHANG Qi-wei, LIU Yu-qing, et al. Model Test of Composite Joint for Tower of Cable-stayed Bridge[J]. Journal of Harbin Institute of Technology, 2017, 49(3):106-112. (in Chinese)
[13] SI Xiu-yong, XIAO Lin, ZHAO Jian-bo. Model Test Research on the Steel-concrete Joint Section of Cable-stayed Bridge Tower[J]. China Railway Science, 2011, 32(5):26-31. (in Chinese)
[14] ZHANG Qing-hua, LI Qiao, TANG Liang. Fracture Mechanism and Ultimate Carrying Capacity of Shear Connectors Applied for Steel-concrete Joint Segment of Bridge Pylon[J]. China Journal of Highway and Transport, 2007, 20(1):85-90. (in Chinese)
[15] ZHANG Xi-gang, WU Wen-ming, LIU Gao. Mechanical Model and Simplified Calculation Method of Steel-concrete Connection Joint with Full-connection Bearing-plates[J].Journal of Highway and Transportation Research and Development, 2013, 31(10):49-53. (in Chinese)
[16] HUO Xue-jin, CHENG Xi. Study on Ultimate Bearing Capacity of Steel-concrete Composite Segment[J]. Journal of Highway and Transportation Research and Development, 2017, 34(3):52-61. (in Chinese)
[17] HUANG Qiao, LI Jun-fang, LI Wen-xian, et al. FE Analysis on Confined Type Steel-concrete Joint Segment of Steel Pylon of Cable-stayed Bridge[J]. Journal of Highway and Transportation Research and Development, 2020, 37(1):50-57. (in Chinese)
[18] LIN Zhao-fei, LIU Yu-qing, Peak Slip and Load-Slip Relationship of Headed Stud Connectors[J]. Journal of Tongji University:Natural Science Edition, 2014, 42(7):1006-1010. (in Chinese) |
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2022, Vol. 16 
