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Bi-directional interaction of joint shear strength in non-seismically designed corner RC beam-column connections under seismic loading

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Earthquake engineering and engineering Vibration 2025年第1期24卷 135-153页

作者： Mohammad Amir Najafgholipour Negin Ahmadi rad Akanshu Sharma department of civil and environmental engineering Shiraz University of TechnologyShiraz ***Iran Lyles School of civil engineering Purdue UniversityWest LafayetteIN 47907-2050USA

Non-seismically designed(NSD)beam-column joints are susceptible to joint shear failure under seismic *** significant research is available on the seismic behavior of such joints of planar frames,the information on the seismic behavior of joints of space frames(3D joints)is *** 3D joints are subjected to bi-directional excitation,which results in an interaction between the shear strength obtained for the joint in the two orthogonal directions *** bi-directional seismic behavior of corner reinforced concrete(RC)joints is the focus of this ***,a detailed finite element(FE)model using the FE software Abaqus,is developed and validated using the test results from the *** validated modeling procedure is used to conduct a parametric study to investigate the influence of different parameters such as concrete strength,dimensions of main and transverse beams framing into the joint,presence or absence of a slab,axial load ratio and loading direction on the seismic behavior of *** subjecting the models to different combinations of loads on the beams along perpendicular directions,the interaction of the joint shear strength in two orthogonal directions is *** comparison of the interaction curves of the joints obtained from the numerical study with a quadratic(circular)interaction curve indicates that in a majority of cases,the quadratic interaction model can represent the strength interaction diagrams of RC beam to column connections with governing joint shear failure reasonably well.

关键词： beam-column joints joint shear failure bidirectional loading interaction curve finite element study

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Rainfall-induced wind erosion in soils stabilized with alkali-activated waste materials

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Journal of Rock Mechanics and Geotechnical engineering 2025年第1期17卷 465-480页

作者： Alireza Komaei Abbas Soroush Seyed Mohammad Fattahi Hesam Ghanbari department of civil and environmental engineering Amirkabir University of TechnologyTehran159163431Iran

This study evaluates the efficacy of sustainable erosion control using slag-based alkali-activated cement crusts under varying rainfall and wind conditions. The rainfall intensities ranged from 30 mm/h to 120 mm/h, with durations ranging from 15 min to 90 min, and crust slopes of ∼2° (gentle) and 30° (steep). Wind tunnel experiments were conducted at wind velocities of 14 m/s, 21 m/s, and 28 m/s to investigate post-rainfall wind erodibility, along with changes in crust strength and microstructure analysis. The findings show the development of hydrated cementitious phases in alkali-activated material, which form around and between the particles during the alkaline activation process. Alkali-activated cement crusts significantly reduced erosion caused by rainfall and subsequent wind by several orders of magnitude. At the highest rainfall intensity of 120 mm/h, rainfall erosion was measured to be 1654.81 kg/m2 for untreated samples and 0.89 kg/m2 for treated samples, demonstrating a substantial 99.95% reduction in erosion due to the treatment. Similarly, at the highest wind speed tested, wind erosion was 122.75 kg/m2 for untreated samples and 0.095 kg/m2 for treated samples, indicating a significant 99.92% reduction in erosion due to the formation of an alkali-activated cement crust on the soil surface. However, exposure of the samples to 120 mm/h rainfall for 90 min resulted in a 5.2-fold increase in wind erosion compared to pre-rainfall conditions. Similarly, penetrometer results indicated a 37%–54% reduction in post-rainfall surface strength.

关键词： Rainfall erosion Alkali-activated material Wind erosion Crust formation

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Vibration response of Euler-Bernoulli-damped beam with appendages subjected to a moving mass

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Earthquake engineering and engineering Vibration 2025年第1期24卷 223-234页

作者： Raed AlSaleh Ayman Nasir Nour Atieh civil and environmental engineering department German Jordanian UniversityAmman 11180Jordan department of Mechanical engineering Al-Zaytoonah University of JordanAmman 11733Jordan Luminus Technical University College Amman 11118Jordan

This paper addresses the problem of a viscoelastic Euler-Bernoulli beam under the influence of a constant velocity moving mass and different types of *** types of boundary conditions are considered:pinned-pinned,fixed-pinned,fixed-free(or cantilever),and *** considered include lumped masses,dampers,and *** modal decomposition method is employed to derive the equation of motion of the beam,for which an analytical closed-form expression of the dynamic vibration response is *** proposed method enables the study of the effect of a single appendage or a combination of the three types of appendages on the non-dimensional dynamic response of the *** examples are presented to illustrate the effects of these appendages and compare them to the reference cases of a beam with no *** results demonstrate the importance of considering these parameters in the design of *** proposed method is compared to other techniques in the literature and found to be advantageous due to its direct *** method also offers a versatile tool for investigating various configurations,aiding in engineering design and structural analysis for which establishing a precise prediction of beam vibrations is crucial.

关键词： Euler-Bernoulli beam modal decomposition vibration response appendages

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Undrained bearing capacity of obliquely-eccentrically loaded shallow foundations overlying a heterogeneous and inherently anisotropic clay deposit

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Journal of Rock Mechanics and Geotechnical engineering 2025年第1期17卷 586-613页

作者： Maedeh Nasiri Pishvari Hessam Fathipour Suraparb Keawsawasvong Boonchai Ukritchon Meghdad Payan Reza Jamshidi Chenari department of civil engineering Faculty of EngineeringUniversity of GuilanRashtIran Research Unit in Sciences and Innovative Technologies for civil engineering Infrastructures Department of Civil EngineeringThammasat School of EngineeringThammasat UniversityThailand department of civil engineering.Chulalongkorn University BangkokThailand department of civil engineering GeoEngineering Centre at Queen's RMCRoyal Military College of CanadaKingstonCanada

Clay deposits typically exhibit significant degrees of heterogeneity and anisotropy in their strength and stiffness *** non-monotonic responses can significantly impact the stability analysis and design of overlying shallow *** this study,the undrained bearing capacity of shallow foundations resting on inhomogeneous and anisotropic clay layers subjected to oblique-eccentric combined loading is investigated through a comprehensive series of finite element limit analysis(FELA)based on the well-established lower-bound theorem and second-order cone programming(SOCP).The heterogeneity of normally consolidated(NC)clays is simulated by adopting a well-known general model of undrained shear strength increasing linearly with *** contrast,for overconsolidated(OC)clays,the variation of undrained shear strength with depth is considered to follow a bilinear ***,the inherent anisotropy is accounted for by adopting different values of undrained shear strength along different directions within the soil medium,employing an iterative-based *** results of numerical simulations are utilized to investigate the influences of natural soil heterogeneity and inherent anisotropy on the ultimate bearing capacity,failure envelope,and failure mechanism of shallow foundations subjected to the various combinations of vertical-horizontal(V-H)and vertical-moment(V-M)loads.

关键词： Shallow foundation Bearing capacity Combined loading Undrained shear strength Inherent anisotropy Heterogeneity

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Anammox-based technologies:A review of recent advances,mechanism,and bottlenecks

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Journal of environmental Sciences 2025年第2期148卷 151-173页

作者： Mabruk Adams Eliasu Issaka Chongjun Chen School of environmental Science and engineering Suzhou University of Science and TechnologySuzhou 2155009China civil engineering School of EngineeringCollege of Science and EngineeringUniversity of GalwayGalway H91 TK33Ireland School of environmental and Safety engineering Institute of Environmental Health and Ecological SecurityJiangsu UniversityZhenjiang 212013China

The removal of nitrogen via the ANAMMOX process is a promising green wastewater treatment technology,with numerous *** incessant studies on the ANAMMOX process over the years due to its long start-up and high operational cost has positively influenced its technological advancement,even though at a rather slow *** the moment,relatively newANAMMOX technologies are being developedwith the goal of treating lowcarbon wastewater at low temperatures,tackling nitrite and nitrate accumulation and methane utilization from digestates while also recovering resources(phosphorus)in a sustainable *** review compares and contrasts the handful of ANAMMOX-based processes developed thus far with plausible solutions for addressing their respective bottlenecks hindering full-scale ***,future prospects for advancing understanding of mechanisms and engineering application of ANAMMOX process are *** a whole,technological advances in process design and patents have greatly contributed to better understanding of the ANAMMOX process,which has greatly aided in the optimization and industrialization of the ANAMMOX *** review is intended to provide researchers with an overview of the present state of research and technological development of the ANAMMOX process,thus serving as a guide for realizing energy autarkic future practical applications.

关键词： Anammox Commamox Denitrification Full-scale Partial nitrification

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Analysis of Nuclear Structure Properties and Stellar β-decay Rates of Even–Even 106–120Zr Isotopes

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Research in Astronomy and Astrophysics 2025年第1期25卷 162-174页

作者： Abdul Kabir Jameel-Un Nabi Syeda Anmol Rida Izzah Anwaar Noor-Ul Ain Raza Hamad Almujibah department of Space Science Institute of Space Technology University of Wah department of civil engineering College of EngineeringTaif University

The nuclear ground state properties of even–even106–120Zr nuclei have been investigated within the framework of the relativistic mean field （RMF） *** RMF model with density-dependent DDME2 and DDPC1interactions is utilized for the calculation of potential energy curves,the nuclear ground-state deformation parameters （β2）,neutron separation energies (S_nand S2n) and neutron skin thickness (rnp) of selected Zr ***,the β-decay properties of Zr isotopes were studied using the proton-neutron quasi-particle random phase approximation （pn-QRPA） *** include Gamow–Teller strength distributions,β-decay half-lives and stellar electron emission/positron capture *** β2values computed from the RMF model were employed in the pn-QRPA model as an input parameter for the calculations of β-decay properties for even–even106–120Zr *** stellar rates were computed using the pn-QRPA framework with three different types of deformation *** at high temperature （T9≥2） and low density (ρYe≤10～7g cm-3) values,the sum of electron emission and positron capture rates has a sizeable contribution （with positive exponents） to the stellar rates.

关键词： (stars:) supernovae: individual (r-process) abundances astroparticle physics elementary particles nuclear reactions nucleosynthesis

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Effects of spatial heterogeneity on pseudo-static stability of coal mine overburden dump slope,using random limit equilibrium and random finite element methods:A comparative study

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Earthquake engineering and engineering Vibration 2025年第1期24卷 83-99页

作者： Madhumita Mohanty Rajib Sarkar Sarat Kumar Das department of civil engineering Indian Institute of Technology(ISM)DhanbadDhanbad 826004India

Sudden and unforeseen seismic failures of coal mine overburden(OB)dump slopes interrupt mining operations,cause loss of lives and delay the production of *** of the spatial heterogeneity of OB dump materials is imperative for an adequate evaluation of the seismic stability of OB dump *** this study,pseudo-static seismic stability analyses are carried out for an OB dump slope by considering the material parameters obtained from an insitu field *** heterogeneity is simulated through use of the random finite element method(RFEM)and the random limit equilibrium method(RLEM)and a comparative study is *** of horizontal and vertical spatial correlation lengths were considered for simulating isotropic and anisotropic random fields within the OB dump *** performances of the slope have been reported through the probability of failure and reliability *** was observed that the RLEM approach overestimates failure probability(P_(f))by considering seismic stability with spatial *** P_(f)was observed to increase with an increase in the coefficient of variation of friction angle of the dump ***,it was inferred that the RLEM approach may not be adequately applicable for assessing the seismic stability of an OB dump slope for a horizontal seismic coefficient that is more than or equal to 0.1.

关键词： coal mine overburden dump slope random limit equilibrium method random finite element method seismic slope stability spatial heterogeneity

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Efficient photocatalytic reduction of CO_(2)to formate by a molecular noble metal-free system

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Science China Chemistry 2025年第1期68卷 152-156页

作者： Lihua Zhang Lingjing Chen Huatian Shi Yue Wei Gui Chen Tai-Chu Lau School of Environment and civil engineering Research Center for Eco-environmental EngineeringDongguan University of TechnologyDongguan 523808China department of Chemistry and Institute of Molecular Functional Materials City University of Hong KongHong Kong 999077China

Reducing CO_(2)to carbon-neutral solar fuels can not only alleviate the energy demand but also mitigate the greenhouse *** present,developing an efficient non-noble metal photo/electrocatalytic system for converting CO_(2)to a specific product beyond CO is still a big ***,we report a new cobalt complex bearing 2,2′-bi-1,10-phenanthroline ligand that can photocatalytically reduce CO_(2)to formate(HCOO^(-)).Turnover number(TON)for HCOO^(-)up to 677 with 99%selectivity can be achieved using organic dyes purpurin as photosensitizer and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole(BIH)as sacrificial reductant in a CO_(2)-saturated NMP/TEA(v/v,3:1)solution under visible light *** potential electrolysis at-1.41 V(***/Ag Cl)in the presence of 12 mM Et_(3)NHBF_(4)also produced HCOO^(-)with Faradaic efficiency of 39%.Spectroscopic and electrochemical studies suggest that a[CoI-H]species is the key intermediate for CO_(2)reduction.

关键词： photocatalysis noble metal-free CO_(2)reduction formate cobalt hydride

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Hybrid and enhanced electrokinetic system for soil remediation from heavy metals and organic matter

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Journal of environmental Sciences 2025年第1期147卷 424-450页

作者： Faris M.Hamdi Namuun Ganbat Ali Altaee Akshaya K.Samal Ibrar Ibrar John L.Zhou Adel O.Sharif Centre for Green Technology School of Civil and Environmental EngineeringThe University of Technology Sydney15 BroadwayNSW 2007Australia department of civil engineering Jazan UniversityJazan 82822Saudi Arabia Centre for Nano and Material Sciences Jain UniversityRamanagaraBangaloreKarnataka 562112India School of Mechanical Sciences Faculty of Engineering and Physical SciencesUniversity of SurreyAustralia

The electrokinetic(EK)process has been proposed for soil decontamination from heavy metals and organic *** advantages of the EK process include the low operating energy,suitability for fine-grained soil decontamination,and no need for *** the last three decades,enhanced and hybrid EK systems were developed and tested for improving the efficiency of contaminants removal from *** enhanced-EK processes exhibited excellent efficiency in removing contaminants by controlling the soil pH or the chemical reaction of *** hybrid systems were tested to overcome environmental hurdles or technical drawbacks of decontamination *** of the EK process with phytoremediation,bioremediation,or reactive filtermedia(RFM)improved the remediation process performance by capturing contaminants or facilitating biological agents’movement in the ***,EK process coupling with solar energy was proposed to treat off-grid contaminated soils or reduce the EK energy *** study reviews recent advancements in the enhancement and hybrid EK systems for soil remediation and the type of contaminants targeted by the *** study also covered the impact of operating parameters,imperfect pollution separation,and differences in the physicochemical characteristics and microstructure of soil/sediment on the EK ***,a comparison between various remediation processes was presented to highlight the pros and cons of these technologies.

关键词： Electrokinetic Soil remediation Reactive filter media Enhanced electrokinetic Contaminants

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Kinked Rebar and engineering Structures Applying Kinked Materials:State-ofthe-Art Review

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Structural Durability & Health Monitoring 2025年第2期19卷 233-263页

作者： Chengquan Wang Lei Xu Xinquan Wang Yun Zou Kangyu Wang Boyan Ping Xiao Li department of civil engineering Hangzhou City UniversityHangzhou310015China Zhejiang engineering Research Center of Intelligent Urban Infrastructure Hangzhou310015China department of civil engineering Jiangnan UniversityWuxi214122China School of civil engineering Zhejiang University of TechnologyHangzhou310014China department of civil engineering Tongji UniversityShanghai200092China

Kinked rebar is a special type of steel material,which is installed in beam column nodes and frame *** effectively enhances the blast resilience,seismic collapse resistance,and progressive collapse resistance of reinforced concrete(RC)structures without imposing substantial cost burdens,thereby emerging as a focal point of recent research *** the basis of explaining the working principle of kinked rebars,this paper reviews the research status of kinked rebars at home and abroad from three core domains:the tensile mechanical properties of kinked rebars,beam column nodes with kinked rebars,and concrete frame structures with kinked *** analysis underscores that the straightening process of kinked rebars does not compromise their ultimate strength but significantly bolsters structural ductility and enhances energy dissipation *** beam-column joints,the incorporation of kinked rebars facilitates the seamless transfer of plastic hinges,adhering to the design principle of“strong columns and weak beams.”In addition,kinked rebars can greatly improve the resistance of the beam;The seismic resistance,internal explosion resistance,and progressive collapse resistance of reinforced concrete frame structures with kinked rebar have significantly *** its primary application,the principle of kinked rebar was extended to other applications of kinked materials such as corrugated steel plates and origami structures,and the stress characteristics of related components and structures were ***,this paper also proposes the application of kinked rebars in bridge engineering,aiming to address the challenges of localized damage concentration and excessive residual displacement in RC bridge *** introduction of kinked rebars in piers is envisioned to mitigate these issues,with the paper outlining its advantages and feasibility,thereby offering valuable insights for future research on kinked reinforcement and seismic design strat

关键词： Structural engineering kinked rebar seismic performance explosion-resistant performance progressive collapse

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