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Seismic fragility assessment of revised MRT buildings considering typical construction changes

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 241-266页

作者： Rakesh DUMARU Hugo RODRIGUES Humberto VARUM construct-LESE Faculty of Engineering(FEUP)University of PortoPorto 4200-465Portugal RISCO School of Technology and ManagementPolytechnic Institute of LeiriaLeiria 2411-901Portugal

The present study investigates the vulnerability assessment of the prototype revised Mandatory Rule of Thumb(MRT)buildings initially designed and detailed for three storeys bare frame building;later modified through variable number of storeys(three,four,and five)and different arrangement of infill walls(bare frame,soft-storey,irregular infilled,and fully infilled).The application of infill walls increases the fundamental frequencies,stiffness,and maximum strength capacity,but reduces the deformation capability than the bare frame *** vulnerability was also reduced through infill walls,where the probability of exceeding partial-collapse and collapse damage reduced by 80% and 50%,***,the increased in storeys(three to five)also increases the failure probability,such that partial-collapse and collapse for fully infilled increases by almost 55% and 80%,*** obtained results and discussions concluded that the structural sections and details assigned for MRT building is not sufficient if considered as bare frame and *** increase in number of storeys causes building highly vulnerable although the infill walls were considered.

关键词： mid-rise buildings revised NBC 205:2012 masonry infill walls configurations of infill walls vulnerability assessment and inter-storey drift

Simulation analysis of construction process of high rock slope's stabilization

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Journal of Harbin institute of Technology(New Series) 2008年第2期15卷 188-193页

作者：朱占元凌贤长王宣青邹祖银 School of Civil Engineering Harbin Institute of Technology Zhengyuan construct Company of Shandong Province Information and Engineering Technology College Sichuan Agricultural University

A self-developed elasto-plastic finite element program was used to analyze the construction sequence of high rock slope's stabilization in a coal-coking plant, and the result was compared with that employing the ultimate equilibrium method. Based on the results of finite element analysis, the stress contour graphs and displacement vector graphs at different construction steps were obtained, and the behavior of the slope during stabilization construction process was analyzed quantitatively. Based on the analysis of safety factors of three different schemes of stabilization and two different construction schemes, the assessment of stability and bracing design of the construction process were performed. The results show that the original reinforcement design is improper; the stability of the rock slope is controlled by a developed structural plane, the stability factor after excavation is less than 1, and the free surface should be braced in time; for stability, the construction sequence should adopt that bracing follows excavation step by step up to down; the local slide occurred during the construction process agrees with the dangerous slide determined by the numerical analysis, which proves the validity and rationality of the adopted method.

关键词： high rock slope stability stabilization construction process simulation elasto-plastic FEM method

Seismic safety assessment of existing masonry infill structures in Nepal

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Earthquake Engineering and Engineering Vibration 2016年第2期15卷 251-268页

作者： Hemchandra Chaulagain Hugo Rodrigues Enrico Spacone Humberto Varum Civil Engineering Department University of Aveiro RISCO School of Technology and ManagementPolytechnic Institute of Leiria University of Chieti-Pescara Department PRICOS–Architettura construct-LESE Faculty of Engineering (FEUP)University of Porto

Reinforced concrete（RC） buildings in Nepal are constructed with RC frames and masonry infill panels. These structures exhibit a highly non-linear inelastic behavior resulting from the interaction between the panels and frames. This paper presents an extensive case study of existing RC buildings in Nepal. Non-linear analyses were performed on structural models of the buildings considered as a bare frame and with masonry infill, in order to evaluate the influence of infill walls on the failure mechanisms. Five three-storey buildings with different structural configurations and detailing were selected. The effect of masonry infill panels on structural response was delineated by comparing the bare-framed response with the infill response. Seismic performance is evaluated with regard to global strength, stiffness, energy dissipation, inter-storey drift, and total deflection of the structure. A parametric analysis of structures with masonry infill is also performed. For this, the influence of different material properties is studied, namely diagonal compressive stress, modulus of elasticity and tensile stress of masonry infill panels. Study results show that masonry infill increases the global strength and stiffness of the structures; it decreases the inter-storey drift and hence the total displacement of the structure. The results quantify the influence of the infill panels on structural response and, in particular, the effect of the diagonal compressive strength of the masonry wall.

关键词： frames diagonal panels compressive drift hence quantify tensile stiffness rotation

Mechanical properties characterization of different types of masonry infill walls

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Frontiers of Structural and Civil Engineering 2020年第2期14卷 411-434页

作者： Andre FURTADO Hugo RODRIGUES Antonio AREDE Humberto VARUM construct-LESE Department of Civil EngineeringFaculty of EngineeringUniversity of PortoPorto 4200-465Portugal R1SCO School of Technology and ManagementPolytechnic Institute of LeiriaLeiria 2411-901Portugal

It is remarkable,the recent advances concerning the development of numerical modeling frameworks to simulate the infill panels'seismic ***,there is a lack of experimental data of their mechanical properties,which are of full importance to calibrate the numerical *** primary objective of this paper is to present an extensive experimental campaign of mechanical characterization tests of infill masonry walls made with three different types of masonry units:lightweight vertical hollow concrete blocks and hollow clay *** different types of experimental tests were carried out,namely:compression strength tests,diagonal tensile strength tests,and flexural strength tests parallel and perpendicular to the horizontal bed joints.A total amount of 80 tests were carried out and are reported in the present *** second objective of this study was to compare the mechanical properties of as-built and existing infill *** results presented and discussed herein,will be in terms of strain-stress curves and damages observed within the *** was observed a fragile behavior in the panels made with hollow clay horizontal bricks,without propagation of *** plaster increased the flexural strength by 57%.

关键词： masonry infill walls experimental characterization compression strength shear diagonal strength flexural strength

A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

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Nano Research 2025年第1期18卷 315-322页

作者： Kun-Peng Yang Song Xie Zi-Meng Han Hao-Cheng Liu Chong-Han Yin Wen-Bin Sun Zhang-Chi Ling Huai-Bin Yang De-Han Li Qing-Fang Guan Shu-Hong Yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

Near-perfect replication on amorphous alloys through active force modulation based on machine learning/neural network parameter prediction

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 181-191页

作者： Senkuan Meng Zheng Wang Ruisong Zhu Ruijie Liu Jiang Ma Lina Hu Weihua Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) School of Materials Science and Engineering Shandong University College of Mechatronics and Control Engineering Shenzhen University Songshan Lake Materials Laboratory institute of Physics Chinese Academy of Sciences

As a microforming technique, micro/nano-structural replication possesses advantages of high precision and efficiency. With the remarkable superplasticity in the supercooled liquid region, amorphous alloys or metallic glasses(MGs) are regarded as ideal materials for miniature fabrication. However, due to the intrinsic metastable nature of supercooled liquids, the design of imprinting processes for MGs poses a challenge. In the past, process parameters have largely relied on trial-and-error *** this work, a low-frequency active force modulation system is employed to apply a stable, precise, and real-time feedback stress field for imprinting of MG samples. Low-frequency vibrations can facilitate the filling of microstructures on the template surface by reducing the effective viscosity of the supercooled liquid. With the dataset composed of orthogonal experiments, a machine learning strategy based on back-propagation(BP) neural networks was utilized to construct a 3D parameter space for temperature, stress, and time, and to predict the corresponding filling ratio. Furthermore, the optimal combination of imprinting process parameters was identified, and its filling ratio was experimentally validated to reach as high as 0.94. The near-perfect replication of microstructures confirms the superiority of the active force modulation system and the data-driven strategy of machine learning-assisted parameter design. At the same time, this one-step microforming process provides a new approach to addressing the accuracy-cost trade-off dilemma in precision manufacturing.

关键词： metallic glass amorphous alloy microforming imprinting machine learning

Wheel-rail contact model for railway vehicle-structure interaction applications:development and validation

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Railway Engineering Science 2023年第3期31卷 181-206页

作者： P.A.Montenegro R.Calçada construct-LESE Faculty of EngineeringUniversity of PortoRua Dr.Roberto Frias S/N4200-465 PortoPortugal

An enhancement in the wheel-rail contact model used in a nonlinear vehicle-structure interaction(VSI)methodology for railway applications is presented,in which the detection of the contact points between wheel and rail in the concave region of the thread-flange transition is implemented in a simplified *** presenting the enhanced formulation,the model is validated with two numerical applications(namely,the Manchester Benchmarks and a hunting stability problem of a sus-pended wheelset),and one experimental test performed in a test rig from the Railway Technical Research institute(RTRI)in *** its finite element(FE)nature,and contrary to most of the vehicle multibody dynamic commercial software that cannot account for the infrastructure flexibility,the proposed VSI model can be easily used in the study of train-bridge systems with any degree of *** validation presented in this work proves the accuracy of the proposed model,making it a suitable tool for dealing with different railway dynamic applications,such as the study of bridge dynamics,train running safety under different scenarios(namely,earthquakes and crosswinds,among others),and passenger riding comfort.

关键词： Vehicle-structure interaction Wheel-rail contact Manchester Benchmarks Thread-flange transition Dynamic analysis Model validation

Influence of train speed and its mitigation measures in the short-and long-term performance of a ballastless transition zone

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Railway Engineering Science 2023年第4期31卷 309-324页

作者： Ana Ramos Rui Calçada António Gomes Correia Department of Civil Engineering Faculty of EngineeringUniversity of PortoCONSTRUCT-LESEPortoPortugal Department of Civil Engineering University of MinhoISISEGuimarãesPortugal

The ballastless track is nowadays the most popular railway system due to the required low number of maintenance opera-tions and costs,despite the high *** gradual change from ballasted to ballastless tracks has been occurring in Asia,but also in Europe,increasing the number of transition *** transition zones are a special area of the railway networks where there is an accelerated process of track degradation,which is a major concern of the railway infrastructure ***,the accurate prediction of the short-and long-term performance of ballastless tracks in transition zones is an important topic in the current paradigm of building/rehabilitating high-speed *** work purposes the development of an advanced 3D model to study the global performance of a ballastless track in an embankment-tunnel transition zone considering the influence of the train speed(220,360,500,and 600 km/h).Moreover,a mitigation measure is also adopted to reduce the stress and displacements levels of the track in the transition.A resilient mat placed in the tunnel and embank-ment aims to soften the *** behaviour of the track with the resilient mat is evaluated considering the influence of the train speed,with special attention regarding the critical *** used methodology is a novel and hybrid approach that allows including short-term and long-term performance,through the development of a powerful 3D model combined with the implementation of a calibrated empirical permanent deformation model.

关键词： Ballastless track Train speed Numerical modelling Transition zone Critical speed

A CLASS OF PP L-STATISTICS FOR TESTS

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Acta Mathematicae Applicatae Sinica 1992年第1期8卷 27-44页

作者：施沛德李国英 institute of Systems Science Academia Sinica Beijing China institute of Systems Science Academia Sinica Beijing Chinapplying projection pursuit (PP) techniques this paper takes L-statistics as projectionindices to construct a class of statistics for multivariate tests. The asymptotic distributions ofthe test statistics under null hypothesis are derived theoretically. Some simple applications tolocation and dispersion problems are given.

Applying projection pursuit (PP) techniques, this paper takes L-statistics as projectionindices to construct a class of statistics for multivariate tests. The asymptotic distributions ofthe test statistics under null ... 详细信息

关键词：投影寻踪 L-统计量