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Abstract: This study aims to assess the comprehensive strengthening effect of a steel-ultra high performance concrete (UHPC) composite strengthening method. The axial force-moment interaction curve (N-M curve) was calculated in a novel way, using cross-sectional strains at ultimate states as well as real-time stress measurements for each material. The enclosed area of the N-M curve was defined as a comprehensive performance index for the system. We validate our approach with comparisons to numerical modeling and full-scale four-point bending experiments. Additionally, strengthening effects were compared for different sagging and hogging moments based on material stress responses, and the impact of various strengthening parameters was analyzed. We find that the N-‍M curve of the strengthened cross-section envelops that of the un-strengthened cross-section. Notably, improvements in flexural capacity are greater under sagging moments during the large eccentric failure stage, and greater under hogging moments during the small eccentric failure stage. This discrepancy is attributed to the strength utilization of strengthening materials. These findings provide a reference for understanding the strengthening effects and parameters of steel-UHPC composite.

钢-超高性能混凝土组合结构对盾构管片衬砌加固效果的分析

[1]ChangCT, WangMJ, ChangCT, et al., 2001. Repair of displaced shield tunnel of the Taipei rapid transit system. Tunnelling and Underground Space Technology, 16(3):167-173.

[2]ChenRP, TangLJ, YinXS, et al., 2015. An improved 3D wedge-prism model for the face stability analysis of the shield tunnel in cohesionless soils. Acta Geotechnica, 10(5):683-692.

[3]ChenRP, ChenS, WuHN, et al., 2020. Investigation on deformation behavior and failure mechanism of a segmental ring in shield tunnels based on elaborate numerical simulation. Engineering Failure Analysis, 117:104960.

[4]ChenRP, GaoBY, RuanSQ, et al., 2024. Experimental study on the mechanical behavior of segmental joints of shield tunnels strengthened by a steel plate-UHPC composite. Tunnelling and Underground Space Technology, 144:105536.

[5]ChengHZ, ChenRP, WuHN, et al., 2020. A simplified method for estimating the longitudinal and circumferential behaviors of the shield-driven tunnel adjacent to a braced excavation. Computers and Geotechnics, 123:103595.

[6]ChengHZ, ChenRP, WuHN, et al., 2021. General solutions for the longitudinal deformation of shield tunnels with multiple discontinuities in strata. Tunnelling and Underground Space Technology, 107:103652.

[7]HuangHW, ZhangDM, 2016. Resilience analysis of shield tunnel lining under extreme surcharge: characterization and field application. Tunnelling and Underground Space Technology, 51:301-312.

[8]HuangHW, ShaoH, ZhangDM, et al., 2017. Deformational responses of operated shield tunnel to extreme surcharge: a case study. Structure and Infrastructure Engineering, 13(3):345-360.

[9]HusseinHH, WalshKK, SargandSM, et al., 2016. Interfacial properties of ultrahigh-performance concrete and high-strength concrete bridge connections. Journal of Materials in Civil Engineering, 28(5):04015208.

[10]LeeKM, GeXW, 2001. The equivalence of a jointed shield-driven tunnel lining to a continuous ring structure. Canadian Geotechnical Journal, 38(3):461-483.

[11]LiMG, ChenJJ, WangJH, et al., 2018. Comparative study of construction methods for deep excavations above shield tunnels. Tunnelling and Underground Space Technology, 71:329-339.

[12]LiXJ, YanZG, WangZ, et al., 2015a. Experimental and analytical study on longitudinal joint opening of concrete segmental lining. Tunnelling and Underground Space Technology, 46:52-63.

[13]LiXJ, YanZG, WangZ, et al., 2015b. A progressive model to simulate the full mechanical behavior of concrete segmental lining longitudinal joints. Engineering Structures, 93:97-113.

[14]LiaoSM, LiuJH, WangRL, et al., 2009. Shield tunneling and environment protection in Shanghai soft ground. Tunnelling and Underground Space Technology, 24(4):454-465.

[15]LiaoSM, FanYY, ShiZH, et al., 2013. Optimization study on the reconstruction and expansion of an underground rail transit center in Shanghai soft ground. Tunnelling and Underground Space Technology, 38:435-446.

[16]LiaoSM, ChengCH, ChenLS, 2018. The planning and construction of a large underpass crossing urban expressway in Shanghai: an exemplary solution to the traffic congestions at dead end roads. Tunnelling and Underground Space Technology, 81:367-381.

[17]LiuDJ, ZhangY, ZuoJP, et al., 2023. Strengthening evaluation and evolution law of the bearing capacity of the normal section of the shield tunnel based on N-M curve. Journal of China University of Mining & Technology, 52(1):76-85 (in Chinese).

[18]LiuX, JiangZJ, YuanY, et al., 2018. Experimental investigation of the ultimate bearing capacity of deformed segmental tunnel linings strengthened by epoxy-bonded steel plates. Structure and Infrastructure Engineering, 14(6):685-700.

[19]MaQL, 2021. Research on Mechanical Properties of Shield Tunnel Segments Strengthened by Ultra High Performance Concrete. MS Thesis, Hunan University, Changsha, China(in Chinese).

[20]MengFY, ChenRP, WuHN, et al., 2020. Observed behaviors of a long and deep excavation and collinear underlying tunnels in Shenzhen granite residual soil. Tunnelling and Underground Space Technology, 103:103504.

[21]MOHURD (Ministry of Housing and Urban-Rural Development of the People’s Republic of China), 2011. Code for Design of Concrete Structures, GB/T 50010-2010. National Standards of the People’s Republic of China(in Chinese).

[22]MoradlooAJ, AdibA, PiroozniaA, 2019. Damage analysis of arch concrete dams subjected to underwater explosion. Applied Mathematical Modelling, 75:709-734.

[23]QuSQ, ZhangY, ZhuYP, et al., 2020. Prediction of tensile response of UHPC with aligned and ZnPh treated steel fibers based on a spatial stochastic process. Cement and Concrete Research, 136:106165.

[24]SemendaryAA, SvecovaD, 2020. Interfacial parameters for bridge connections at high-strength concrete‍–‍ultrahigh-performance concrete interface. Journal of Materials in Civil Engineering, 32(4):04020060.

[25]ShaoXD, YiDT, HuangZY, et al., 2013. Basic performance of the composite deck system composed of orthotropic steel deck and ultrathin RPC layer. Journal of Bridge Engineering, 18(5):417-428.

[26]ShaoXD, HeG, ShenXJ, et al., 2021. Conceptual design of 1000 m scale steel-UHPFRC composite truss arch bridge. Engineering Structures, 226:111430.

[27]ShaoXD, ZengHQ, CaoJH, 2023. Flexural behavior of fully prefabricated large-cantilevered high strength steel-UHPC composite bent caps. Journal of Constructional Steel Research, 204:107856.

[28]SAMR (State Administration for Market Regulation), 2022. Test Methods of Steel for Reinforcement of Concrete, GB/T 28900-2022. National Standards of the People’s Republic of China(in Chinese).

[29]YinH, TeoW, ShiraiK, 2017. Experimental investigation on the behaviour of reinforced concrete slabs strengthened with ultra-high performance concrete. Construction and Building Materials, 155:463-474.

[30]ZhangJF, ChenJJ, WangJH, et al., 2013. Prediction of tunnel displacement induced by adjacent excavation in soft soil. Tunnelling and Underground Space Technology, 36:24-33.

[31]ZhangJL, LiuX, RenTY, et al., 2019. Structural behavior of reinforced concrete segments of tunnel linings strengthened by a steel-concrete composite. Composites Part B: Engineering, 178:107444.

[32]ZhangXH, LinZR, ZhangKP, et al., 2023. Full-scale experimental test for load–bearing behavior of the carbon fiber shell reinforced stagger–jointed shield tunnel. Composite Structures, 311:116773.

[33]ZhangY, ZhuYP, YesetaM, et al., 2019. Flexural behaviors and capacity prediction on damaged reinforcement concrete (RC) bridge deck strengthened by ultra-high performance concrete (UHPC) layer. Construction and Building Materials, 215:347-359.

[34]ZhangY, LiXL, ZhuYP, et al., 2020. Experimental study on flexural behavior of damaged reinforced concrete (RC) beam strengthened by toughness-improved ultra-high performance concrete (UHPC) layer. Composites Part B: Engineering, 186:107834.

[35]ZhuYP, ZhangY, HusseinHH, et al., 2020a. Flexural strengthening of reinforced concrete beams or slabs using ultra-high performance concrete (UHPC): a state of the art review. Engineering Structures, 205:110035.

[36]ZhuYP, ZhangY, HusseinHH, et al., 2020b. Numerical modeling for damaged reinforced concrete slab strengthened by ultra-high performance concrete (UHPC) layer. Engineering Structures, 209:110031.

[37]ZhuYP, HusseinH, KumarA, et al., 2021. A review: material and structural properties of UHPC at elevated temperatures or fire conditions. Cement and Concrete Composites, 123:104212.