Methodology for calculating load capacity reduction and slip relationship of clustered group nail connectors

Abstract

Clustered group nail connectors are key connecting components for the full lifecycle construction and safe operation of steel–concrete composite structural bridges. To thoroughly investigate the stress mechanism of clustered group nail connectors in steel–concrete composite structures, this paper conducts a detailed numerical analysis on 100 sets of such connectors. It analyzes the stress mechanism of individual nail connectors and quantitatively calculates the group nail effect under the coupled action of multiple factors (nail spacing between layers, number of nail layers, concrete strength). Based on clarifying the force transmission patterns of nails and concrete in different layers during the loading process, this paper proposes a method for calculating the average bearing capacity reduction coefficient and the load-slip curve of single nails in clustered group nail connectors under the coupled action of multiple factors, which has been validated by experimental data. This research provides a theoretical basis for the design and calculation of group nail connectors in steel–concrete composite structural bridges.

Keywords

Steel–concrete composite structure / Clustered group nail connectors / Bearing capacity reduction / Load-slip relationship

References

[] Anderson D (2004) Eurocode 4 Design of composite steel and concrete structures [J]. Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-642-41714-6_51757

[] Classen M. Limitations on the use of partial shear connection in composite beams with steel T-sections and uniformly spaced rib shear connectors [J]. J Constr Steel Res, 2018, 142: 99-112,

[] Deng WQ, Hu JW, Liu D, Zhao XB, Cha S, Zhang JD. Test and calculation method of shear bearing capacity of cluster welding nail connectors [J]. China J highway Transp, 2022, 35: 194-204,

[] Ding FX, Yin GA, Wang HB. Static behavior of nail connectors in bi-direction push-off tests[J]. Thin-WalledStructures, 2017, 120: 307-318,

[] Ding JG, Zhu JS, Kang JF, Wang XC. Experimental naily on grouped nail shear connectors in precast steel- UHPC composite bridge[J]. Eng Struct, 2021, 242: 112479,

[] Fang ZC, Fang HZ, Huang JX, Jiang HB, Chen GF. Static behavior of grouped nail shear connectors in steel–precast UHPC composite structures containing thin full-depth slabs[J]. Eng Struct, 2022, 252: 113484,

[] GB 50917–2013 (2013) Code for Design of Steel-concrete Composite Bridges [S]. China Architecture and Construction Press, Beijing

[] GB/T 10433–2002 (2003) Cylindrical head welding nail for arc nail welding [S]. State Administration of Quality Supervision, Inspection and Quarantine, Beijing

[] Huang CP, Zhang ZX, Zheng ZJ. Force characteristics and failure mechanism experimental study of group nail in steel concrete composite structure[J]. J Wuhan Univ Technol, 2015, 37: 100-105,

[] Li M. . Study on refined calculation method and time-effect characteristics of stud connectors of steel-concrete composite beam bridge [D], 2015 Nanjing, China Doctoral thesis, Southeast University

[] Li CJ. . Naily on force transfer mechanism and calculation method of shear connectors of assembled composite beams [D], 2017 Chongqing, China Doctoral thesis, Chongqing Jiaotong University

[] Lian WR. . Naily on mechanical properties and design method of steel-concrete composite pylon anchorage system with steel anchor box [D], 2015 Xian, China Doctoral thesis, Chang 'an University

[] Lin ZF, Liu YQ. Model experiment on shear-tension interaction relation ship of headed studs [J]. China J Highway Trans, 2015, 28: 80-86,

[] Luo YZ. . Research on bolt-nailed shear joints of steel-concrete composite beams [D], 2008 Changsha China Doctoral thesis, Central South University

[] Okada J, Yoda T, Lebet JP. A naily of the grouped arrangement of nail connectors on the shear strength behavior [J]. J Struct Mech Earthquake, 2006, 23: 75-89,

[] Shi L. . Naily on the mechanical behavior of assembled discrete group nail shear key in composite beam [D], 2021 Thesis Chongqing Jiaotong University, Chongqing, China

[] Shi L, Fan L. Experimental naily on mechanical behavior of prefabricated multi-key shear keys [J]. J Civil Environ Engin, 2022, 44: 105-112,

[] Su QT, Han X, Ren F. Mechanical properties of multi-row push-out test specimens [J]. J Tongji Univ, China, 2014, 42: 1011-1016,

[] Tong GS. Stability interpretation of multi-storey frame-support frame in GB50017–2017 "Steel Structure Design Standard" [J]. Steel structure 2019;3. https://doi.org/10.13206/j.gjg201901017.

[] Tong LW, Chen LH, Wen M, Xu C. Static behavior of nail shear connectors in high-strength-steel–UHPC composite beams. Eng Struct, 2020, 218: 110827,

[] Wang YH, Yu J, Liu JP, Chen YF. Shear behavior of shear nail groups in precast concrete decks. Eng Struct, 2019, 187: 73-84,

[] Wang JQ, Qi JN, Tong T, Xu QZ, Xiu HL. Static behavior of large nail shear connectors in steel-UHPC composite structures. Eng Struct, 2019, 178: 534-542,

[] Wang W, Zhang XD, Ding FX, Zhou XL. Finite element analysis on shear behavior of high-strength bolted connectors under inverse push-off loading. Energies, 2021, 14: 479,

[] Wang W, Zhang XD, Zhou XL, Wu L, Zhu HJ. Naily on Shear Behavior of Multi-Bolt Connectors for Prefabricated Steel–Concrete Composite Beams. Frontiers in Materials. 2021 8;2296–8016. https://www.frontiersin.org/articles/10.3389/fmats.2021.625425

[] Wei X, Xiao L, Wen ZY. Research progress of steel-concrete composite bridge in 2020 [J]. J Civil Environ Engin, 2021, 43: 107-119,

[] Xu C, Sugiura K. FEM analysis on failure development of group studs shear connector under effects of concrete strength and stud dimension [J]. Eng Fail Anal, 2013, 35: 343-354,

[] Xu C, Sugiura K, Wu C, Su QT. Parametrical static analysis on group nails with typical push-out tests[J]. J Constr Steel Res, 2012, 72: 84-96,

[] Xu H, Zhang S, Rong B. Investigation on shear behavior of nails and PBL shear connectors in steel-concrete hybrid bridge girder. Structures, 2022, 43: 1422-1435,

[] Yang F, Liu Y, Jiang Z. Shear performance of a novel demountable steel-concrete bolted connector under static push-out tests[J]. Eng Struct, 2018, 160: 133-146,

[] Yu YL, Guo SJ, Wang LC, Yang Y, Xiang YQ. Experimental and numerical analysis of grouped nail shear connectors embedded in HFRC[J]. Constr Build Mater, 2020, 242: 118197,

[] Zhang Q, Jia D, Bao Y. Internal force transfer effect-based fatigue damage evaluation for PBL shear connector groups[J]. J Constr Steel Res, 2018, 148: 469-478,

[] Zhang J, Hu XM, Fu WJ, Du H, Sun QM, Zhang Q. Experimental and theoretical naily on longitudinal shear behavior of steel-concrete composite beams[J]. J Constr Steel Res, 2020, 171: 106144,

[] Zhang G, Li XY, Tang CH, Song CJ, Ding YH. Behavior of steel box bridge girders subjected to hydrocarbon fire and bending-torsion coupled loading [J]. Eng Struct, 2023, 296: 116906,

[] Zhang G, Tang CH, Li XY. Fire resistance of steel truss-concrete composite bridge girder. J Building Struct, 2023, 44: 214-226,

[] Zhang AP. . Study on shear Performance of stud connectors of Steel-hybrid structure [D], 2021 Hangzhou, China Doctoral thesis, Zhejiang university

[] Zhou XH, Zhi WR, Di J. Nail effect and calculation method of shear bearing capacity of bolted shear connectors of steel anchor box [J]. J China Highway, 2014, 27: 13 JournalArticle/5b435873c095d716a4c7387e

Funding

Natural Science Basic Research Program of Shaanxi(No. 2022JC-23); Innovation Capability Support Program of Shaanxi(No. 2023-CX-TD-38)