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学者姓名：BRUNO BRISEGHLLA
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Abstract ：
It is well established that, for tuned mass dampers, a high mass ratio relative to the protected structure is essential for effective performance under seismic excitation inmost scenarios. This paper proposes a novel method to enhance the seismic effectiveness of a tuned mass damper without increasing the mass ratio. The proposed approach introduces an innovative device in which a tuned mass damper is serially coupled with a vibro-impacting mass that slides with negligible friction before impacting the boundaries of its runway. This system is then connected to the first storey of the frame structure via a Kelvin-Voigt visco-elastic device. The study employs a dynamically equivalent four-degree-of-freedom model, with its governing equations derived through a direct formulation approach. Initially, the coupled system is subjected to harmonic excitation, and the resulting behaviour is represented using frequency-response curves, which depict the maximum displacements of the structure in relation to the excitation frequency. Following this, a subsequent analysis involves subjecting the system to three distinct earthquake records to evaluate its performance under seismic excitation. To evaluate the effectiveness of the proposed protective device in reducing the displacements of the frame structure during seismic events, the displacements of the first storey and the drifts of the superstructure are compared to those of a frame structure without the external device. The findings indicate that the proposed device performs effectively across a wide range of system parameters, proving to be especially effective for low- and medium-rise frame structures.
Keyword ：
External structure External structure frame structure frame structure Inerter device Inerter device Partial connection Partial connection Seismic performances Seismic performances Visco-elastic coupling Visco-elastic coupling
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| GB/T 7714 | Di Egidio, Angelo , Briseghella, Bruno , Contento, Alessandro . Combined tuned mass damper and vibro-impacting nonlinear energy sink for the seismic protection of frame structures [J]. | STRUCTURES , 2024 , 70 . |
| MLA | Di Egidio, Angelo 等. "Combined tuned mass damper and vibro-impacting nonlinear energy sink for the seismic protection of frame structures" . | STRUCTURES 70 (2024) . |
| APA | Di Egidio, Angelo , Briseghella, Bruno , Contento, Alessandro . Combined tuned mass damper and vibro-impacting nonlinear energy sink for the seismic protection of frame structures . | STRUCTURES , 2024 , 70 . |
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In jointless bridges, a grade flat approach slab (GFAS) with the same elevation as the pavement can transfer the girder's longitudinal deformation to the backfill. However, any cracks and settlement of the pavement usually occur at the end of the GFAS. To address this shortcoming, the buried flat approach slab (BFAS) horizontally embedded at a depth in the backfill was proposed. The complicated flat approach slab-soil interaction (FASSI) of the BFAS has not been systemically investigated. To address this gap, the influence of the FASSI on the mechanical performance of the approach slab and the backfill deformation was investigated in this research to understand the mechanism of the FASSI in absorbing one part of the girder's longitudinal deformation and transferring the rest to the soil. Experimental tests on the FASSI with different embedded depths under longitudinal displacements were conducted. Numerical parametric analyses were carried out by considering the embedded depths and slab lengths as the parameters based on a finite element model verified using the test results. The results show that load-displacement curves of the FASSI comprise three stages: the elastic stage (approach slab's displacement was absorbed by sand), the elastoplastic stage (sand deformation was observed), and the failure stage (overall shear failure of the sand was found). The longitudinal displacement transfer mode and vertical deformation distribution mode of the sand were affected by the embedded depth and slab length. With an increase in the embedded depth or a decrease in the slab length, the sand deformation decreases, which is beneficial for avoiding pavement crack risks and improving the pavement evenness. Finally, a simplified calculation formula that can be used to predict the load-displacement curves of the FASSI was proposed. This research provides the theoretical basis for the design and construction of the flat approach slab in jointless bridges.
Keyword ：
approach slab-soil interaction approach slab-soil interaction flat approach slab flat approach slab jointless bridges jointless bridges load-displacement curve load-displacement curve sand deformation sand deformation simplified calculation formula simplified calculation formula
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| GB/T 7714 | Tang, Yufeng , Briseghella, Bruno , Xue, Junqing et al. Experimental and Numerical Investigations of Flat Approach Slab-Soil Interaction in Jointless Bridge [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (24) . |
| MLA | Tang, Yufeng et al. "Experimental and Numerical Investigations of Flat Approach Slab-Soil Interaction in Jointless Bridge" . | APPLIED SCIENCES-BASEL 14 . 24 (2024) . |
| APA | Tang, Yufeng , Briseghella, Bruno , Xue, Junqing , Nuti, Camillo , Huang, Fuyun . Experimental and Numerical Investigations of Flat Approach Slab-Soil Interaction in Jointless Bridge . | APPLIED SCIENCES-BASEL , 2024 , 14 (24) . |
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This paper investigates the mechanical performance of ultra-high-performance concrete (UHPC) beam-to-beam joints in steel–concrete composite bridges, proposing an alternative to conventional reinforced concrete (RC) joints in continuous beams. The authors employed UHPC with steel end-plates and studs to connect the UHPC crossbeam with the steel beams and RC slab. These connections provides advantages like eliminating the need for on-site welding, simplifying construction, and handling potential tolerance issues. The research includes full-scale experimental tests, a benchmark test on an RC joint, validation of finite element models, parametric analyses, and the development of analytical models to predict the joint's moment–rotation curve, initial stiffness, and ultimate bending capacity. Full-scale experiments revealed that the maximum longitudinal concrete stress in UHPC continuity joints occurs at the interface between the composite steel–concrete beam and the UHPC cross-beams, resulting in crack widths substantially below code limits. The parametric analyses identified critical factors affecting UHPC joint performance, such as concrete strength, steel yield strength, and horizontal stud dimensions. Additionally, the study validated existing formulations for predicting the capacity and stiffness of the joints against the results from the finite element (FE) parametric analyses. © 2024 The Author(s)
Keyword ：
Benchmarking Benchmarking Bending tests Bending tests Composite beams and girders Composite beams and girders Composite bridges Composite bridges Concrete beams and girders Concrete beams and girders Concrete testing Concrete testing Finite element method Finite element method High performance concrete High performance concrete Reinforced concrete Reinforced concrete Stiffness Stiffness Studs (fasteners) Studs (fasteners) Studs (structural members) Studs (structural members)
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| GB/T 7714 | Contento, Alessandro , Aloisio, Angelo , Xue, Junqing et al. Ultra-high performance concrete beam-to-beam connections in continuous bridges: Experimental full-scale tests, FE analyses and design [J]. | Engineering Structures , 2024 , 316 . |
| MLA | Contento, Alessandro et al. "Ultra-high performance concrete beam-to-beam connections in continuous bridges: Experimental full-scale tests, FE analyses and design" . | Engineering Structures 316 (2024) . |
| APA | Contento, Alessandro , Aloisio, Angelo , Xue, Junqing , He, Junping , Briseghella, Bruno . Ultra-high performance concrete beam-to-beam connections in continuous bridges: Experimental full-scale tests, FE analyses and design . | Engineering Structures , 2024 , 316 . |
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The compressive behavior of steel tube reinforced concrete (STRC) columns under eccentric loads was investigated experimentally and numerically in this paper. Primary parameters included the eccentricity ratio, the concrete-filled steel tube (CFST) area ratio, and the longitudinal rebar ratio. This paper analyzed the impacts of these parameters as well as the failure modes, the full-range compression process, and the strain development. Similar to the reinforced concrete (RC) column, the full-range compression process of STRC column under eccentric loads can be divided into three stages, i.e., elastic stage, elastic-plastic stage (cracking stage), and plastic stage (descent stage). The experimental findings showed that, on the near-load side of the STRC column, the outer concrete crushed, and the longitudinal rebars buckled in compression. Conversely, on the far-load side, the concrete exhibited cracking in tension, and the longitudinal rebars exhibited tension. Finite element (FE) analysis results demonstrated that, similar to a RC column, three distinct failure mechanisms can be identified for STRC columns under eccentric loads, i.e., compression-controlled, balanced, and tension-controlled failures. During the compression process, analyses were conducted on the contact stress between the steel tube and concrete, as well as on the load distribution between the inner CFST and the outer RC. The ultimate load of the STRC column decreased with an increase in the eccentricity ratio, while it increased with larger longitudinal rebar ratio and CFST area ratio. Based on the experimental and FE analysis results, a simplified calculation method was developed to determine the eccentricity reduction coefficient for STRC columns.
Keyword ：
CFST area ratio CFST area ratio Eccentricity reduction coefficient Eccentricity reduction coefficient Failure mechanism Failure mechanism Finite element analysis Finite element analysis STRC column STRC column
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| GB/T 7714 | He, Fuyun , Li, Cong , Shen, Wei et al. Compressive behavior of steel tube reinforced concrete column under eccentric loads [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 . |
| MLA | He, Fuyun et al. "Compressive behavior of steel tube reinforced concrete column under eccentric loads" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 219 (2024) . |
| APA | He, Fuyun , Li, Cong , Shen, Wei , Chen, Baochun , Briseghella, Bruno . Compressive behavior of steel tube reinforced concrete column under eccentric loads . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 . |
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This study presents the structural design and lifecycle analysis of an orthotropic steel deck (OSD) bascule bridge in Viareggio (Italy), considering various operational states and constraints. The analysis varied the bridge's opening angle in 15-degree increments from 0 to 90 degrees, using two steel grades, S355 and S450, by comparing hydraulic or electro-mechanically driven activation mechanisms. The findings reveal that as the static model transitions from pinned-pinned to cantilevered when the bridge is opened, the structural demand for bending moment and shear force increases, with a maximum of nearly 15°–30°. At the same time, axial forces shift from tensile to compressive. Structural design has been carried out using higher grade steel (S450), which has led to a 17.17% mass reduction, cost savings of 3.4%, and a notable decrease in CO2 emissions by 16%. This proves that despite using higher-grade steel characterized by more significant CO2 emissions, the mass reduction associated with the refined design leads to an overall lower environmental footprint. This fact underscores the importance of selecting proper steel grades for steel to achieve an optimal trade-off between CO2 emissions and mass reduction. © 2024 The Author(s)
Keyword ：
Activation analysis Activation analysis Bascule bridges Bascule bridges Bridge decks Bridge decks Carbon dioxide Carbon dioxide Chemical activation Chemical activation Economic and social effects Economic and social effects Life cycle Life cycle Structural analysis Structural analysis
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| GB/T 7714 | Maiorana, Emanuele , Aloisio, Angelo , Fofou, Adrian Bognou et al. Structural design and lifecycle analysis of an orthotropic steel deck bascule bridge [J]. | Structures , 2024 , 63 . |
| MLA | Maiorana, Emanuele et al. "Structural design and lifecycle analysis of an orthotropic steel deck bascule bridge" . | Structures 63 (2024) . |
| APA | Maiorana, Emanuele , Aloisio, Angelo , Fofou, Adrian Bognou , Briseghella, Bruno . Structural design and lifecycle analysis of an orthotropic steel deck bascule bridge . | Structures , 2024 , 63 . |
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In this paper, three alkaline activators, namely sodium hydroxide (SH), calcium oxide and sodium carbonate (COSC), calcium hydroxide and sodium sulfate (CHSS), and the influence of different alkali equivalents on the carbonation resistance of alkali -activated slag concrete (AASC) were investigated. By testing the mechanical properties at different carbonation ages of AASC with three types of activators at varying alkali equivalents (4%, 6%, and 8%), along with the changes in carbonation depth, this study aims to characterize hydration products and porosity through microstructural analysis. The objective is to explain the mechanism by which carbonation affects the AASC structure. The findings showed that the carbonation rate (i.e., the growth rate of the carbonation depth) of AASC was CHSS > COSC > SH when the exciter dosages were the same, and the carbonation rate of all samples tended to slow down as the alkali components increased. Calcite and spherulite were the calcium carbonate morphologies after SH, COSC, and CHSS carbonation according to XRD, TG/DSC, and pore structure tests; the calcium carbonate content decreased with increasing alkali equivalent after carbonation. Since the pore -increasing effect of carbonation due to the destruction of C -S -H is weaker than the filling effect produced by calcium carbonate, the total pore volume of SH, COSC, and CHSS decreased due to the activator effect after carbonation. Specifically, the calcium carbonate created by carbonation repairs pores and cracks of matrix, but its presence also reduces the calcium hydroxide concentration, leading to a decrease in the alkalinity of the pore solution, which disrupts the structure of the hydration products and loosens the matrix. The focus is on which aspect is more decisive. Interestingly, small pores however decreased, while there was an increase in larger pore sizes resulting in a change in pore size distribution. However, this negative impact on pore distribution decreased with increasing alkali dosage.
Keyword ：
Alkali equivalent Alkali equivalent Anti-carbonation Anti-carbonation Carbonation depth Carbonation depth Compressive strength Compressive strength Porosity Porosity
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| GB/T 7714 | Shi, Peng , Falliano, Devid , Yang, Zhengxian et al. Investigation on the anti-carbonation properties of alkali-activated slag concrete: Effect of activator types and dosages [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 91 . |
| MLA | Shi, Peng et al. "Investigation on the anti-carbonation properties of alkali-activated slag concrete: Effect of activator types and dosages" . | JOURNAL OF BUILDING ENGINEERING 91 (2024) . |
| APA | Shi, Peng , Falliano, Devid , Yang, Zhengxian , Marano, Giuseppe Carlo , Briseghella, Bruno . Investigation on the anti-carbonation properties of alkali-activated slag concrete: Effect of activator types and dosages . | JOURNAL OF BUILDING ENGINEERING , 2024 , 91 . |
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Integral abutment bridges (IABs) have been widely applied in bridge engineering because of their excellent seismic performance, long service life, and low maintenance cost. The superstructure and substructure of an IAB are integrally connected to reduce the possibility of collapse or girders falling during an earthquake. The soil behind the abutment can provide a damping effect to reduce the deformation of the structure under a seismic load. Girders have not been considered in some of the existing published experimental tests on integral abutment-reinforced-concrete (RC) pile (IAP)-soil systems, which may not accurately represent real conditions. A pseudo-static low-cycle test on a girder-integral abutment-RC pile (GIAP)-soil system was conducted for an IAB in China. The experiment's results for the GIAP specimen were compared with those of the IAP specimen, including the failure mode, hysteretic curve, energy dissipation capacity, skeleton curve, stiffness degradation, and displacement ductility. The test results indicate that the failure modes of both specimens were different. For the IAP specimen, the pile cracked at a displacement of +2 mm, while the abutment did not crack during the test. For the GIAP specimen, the pile cracked at a displacement of -8 mm, and the abutment cracked at a displacement of 50 mm. The failure mode of the specimen changed from severe damage to the pile top under a small displacement to damage to both the abutment and pile top under a large displacement. Compared with the IAP specimen, the initial stiffness under positive horizontal displacement (39.2%), residual force accumulation (22.6%), residual deformation (12.6%), range of the elastoplastic stage in the skeleton curve, and stiffness degradation of the GIAP specimen were smaller; however, the initial stiffness under negative horizontal displacement (112.6%), displacement ductility coefficient (67.2%), average equivalent viscous damping ratio (30.8%), yield load (20.4%), ultimate load (7.8%), and range of the elastic stage in the skeleton curve of the GIAP specimen were larger. In summary, the seismic performance of the GIAP-soil system was better than that of the IAP-soil system. Therefore, to accurately reflect the seismic performance of GIAP-soil systems in IABs, it is suggested to consider the influence of the girder.
Keyword ：
bridge engineering bridge engineering displacement ductility displacement ductility equivalent viscous damping ratio equivalent viscous damping ratio integral abutment bridge integral abutment bridge pseudo-static test pseudo-static test seismic performance seismic performance
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| GB/T 7714 | Guo, Weiqiang , Briseghella, Bruno , Xue, Junqing et al. Experimental Investigations of Seismic Performance of Girder-Integral Abutment-Reinforced-Concrete Pile-Soil Systems [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (22) . |
| MLA | Guo, Weiqiang et al. "Experimental Investigations of Seismic Performance of Girder-Integral Abutment-Reinforced-Concrete Pile-Soil Systems" . | APPLIED SCIENCES-BASEL 14 . 22 (2024) . |
| APA | Guo, Weiqiang , Briseghella, Bruno , Xue, Junqing , Nuti, Camillo , Huang, Fuyun . Experimental Investigations of Seismic Performance of Girder-Integral Abutment-Reinforced-Concrete Pile-Soil Systems . | APPLIED SCIENCES-BASEL , 2024 , 14 (22) . |
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Cow dung possesses potential agricultural and energy value but is often regarded as waste and underutilized in most cases. This wastage of resources not only poses a challenge to agricultural sustainability but also limits economic development in rural areas. Cow dung contains natural cellulose components like cellulose and lignin that are derived and used to prepare fiber materials. This paper explores a potential value-added application of agricultural waste, i.e., cow dung fibers to reinforce the alkali-activated slag composites (AASC), which are fabricated based on an industrial by-product slag. The raw and alkali treated cow dung fibers were characterized using scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), thermo-gravimetric analysis (TGA) and X-ray diffraction (XRD). The porosity, density, water absorption, strength and drying shrinkage of AASC were tested and used to evaluate the effect of alkali treated fibers on the properties of AASC. The results showed that subjecting cow dung fibers to alkali treatment improved their surface roughness and thermal stability. The addition of cow dung fibers led to an augmentation in the splitting tensile strength of AASC, primarily due to the bridging action of these fibers. In particular, the 28-day splitting tensile strength of AASC containing 1 wt% of untreated cow dung fibers increased by 17.1% over the reference sample, and this increase was more pronounced in the alkali treated fiber sample. Moreover, the alkali treatment effectively reduced the effects of loss of compressive strength and increased drying shrinkage caused by fiber incorporation. The findings of this paper are helpful to solve the management problems of cow dung waste, reduce the environmental burden and realize the value utilization of resources.
Keyword ：
Alkali-activated slag composites Alkali-activated slag composites Cow dung fibers Cow dung fibers Microstructure Microstructure Strength Strength Treatment Treatment
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| GB/T 7714 | Yang, Zhengxian , Li, Kang , Yan, Xueyuan et al. Characterization and value-added applications of natural cellulose fibers derived from cow dung in cementitious composites [J]. | CELLULOSE , 2024 , 31 (9) : 5575-5589 . |
| MLA | Yang, Zhengxian et al. "Characterization and value-added applications of natural cellulose fibers derived from cow dung in cementitious composites" . | CELLULOSE 31 . 9 (2024) : 5575-5589 . |
| APA | Yang, Zhengxian , Li, Kang , Yan, Xueyuan , Wu, Wenda , Briseghella, Bruno , Marano, Giuseppe Carlo . Characterization and value-added applications of natural cellulose fibers derived from cow dung in cementitious composites . | CELLULOSE , 2024 , 31 (9) , 5575-5589 . |
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A new nanocomposite g-C3N4/CoAl-LDH was synthesized and implemented to make alkali-activated steel slagbased photocatalytic pervious concrete (ASSPPC). The water permeability, compressive strength, microstructure, and NOx degradation ability of ASSPPC were investigated. The results show that at lower dosages (1 wt% and 3 wt%), the spherical structure facilitates excellent dispersion of g-C3N4/CoAl-LDH within the matrix, which leads to reduced matrix porosity, resulting in improved compressive strength and reduced water permeability in ASSPPC. Compared to control previous concrete, the compressive strength of ASSPPC with 1 wt% g-C3N4/CoAl- LDH increased by 6.3%, and water permeability of which decreased by 15.4%, respectively. However, at higher dosages (5 wt%), g-C3N4/CoAl-LDH tends to agglomerate, causing lower hydration degree and higher matrix porosity. Moreover, owing to the remarkable alkali resistance of g-C3N4/CoAl-LDH, ASSPPC with this photocatalyst only marginally decreases its NOx degradation ability as the curing age increases. When considering water permeability, compressive strength, and NOx degradation ability, ASSPPC with 3 wt% g-C3N4/CoAl-LDH demonstrates optimal performance, which gives both compressive strength and water permeability equivalent to pervious concrete without photocatalyst while exhibiting a NOx degradation rate 0.58 times higher than that of ASSPPC with 3 wt% g-C3N4.
Keyword ：
Alkali-activation Alkali-activation Ground granulated blast furnace slag Ground granulated blast furnace slag NOx degradation NOx degradation Pervious concrete Pervious concrete Steel slag Steel slag
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| GB/T 7714 | Chen, Shanghong , Xiong, Xiaoli , Yang, Zhengxian et al. The microstructure and NOx degradation ability of alkali-activated steel slag-based pervious concrete doped with g-C3N4/CoAl-LDH [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 419 . |
| MLA | Chen, Shanghong et al. "The microstructure and NOx degradation ability of alkali-activated steel slag-based pervious concrete doped with g-C3N4/CoAl-LDH" . | CONSTRUCTION AND BUILDING MATERIALS 419 (2024) . |
| APA | Chen, Shanghong , Xiong, Xiaoli , Yang, Zhengxian , Lin, Jiafu , Zhang, Jianfu , Briseghella, Bruno et al. The microstructure and NOx degradation ability of alkali-activated steel slag-based pervious concrete doped with g-C3N4/CoAl-LDH . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 419 . |
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The research focused on the design of a curved shell-supported footbridge using a form-finding algorithm and genetic optimization. The bridge was shaped through a parametric design code, which also allows optimization based on finite element structural analysis. The constrained optimization involved a mono-objective approach aided by penalty functions to control the maximum tension utilization of the concrete material. The objective was to find the optimal bridge shape in terms of minimizing displacement under vertical and horizontal loads, with both the topological optimization of the positions of the bridge supports and the optimization of the control points of the Bezier curve describing the form of the curved deck as key parameters. The results provide insights into effective techniques for optimizing the design of curved shell-supported footbridges subjected to earthquake loads. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.
Keyword ：
Conceptual design Conceptual design Constrained optimization Constrained optimization Curve fitting Curve fitting Footbridges Footbridges Seismic design Seismic design Shape optimization Shape optimization Shells (structures) Shells (structures) Structural optimization Structural optimization Topology Topology
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| GB/T 7714 | Fenu, Luigi , Hosseini, Alireza , Punzo, Stefano et al. Form-finding with Restraint Topology Optimization of a Curved Shell-Supported Footbridge under Vertical and Horizontal Loads [C] . 2024 : 867-876 . |
| MLA | Fenu, Luigi et al. "Form-finding with Restraint Topology Optimization of a Curved Shell-Supported Footbridge under Vertical and Horizontal Loads" . (2024) : 867-876 . |
| APA | Fenu, Luigi , Hosseini, Alireza , Punzo, Stefano , Briseghella, Bruno , Giaccu, Gian Felice . Form-finding with Restraint Topology Optimization of a Curved Shell-Supported Footbridge under Vertical and Horizontal Loads . (2024) : 867-876 . |
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